Multiparameter Flow Cytometric Analysis of the Conventional and Monocyte-Derived DC Compartment in the Murine Spleen

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} div.type-section h2 { font-size: 20px; line-height: 26px; font-weight: 300; } div.type-section h3 { margin-left: 15px; margin-bottom: 0px; font-weight: 300; } .journal-tabs .tab-title.active a { } </style> <link rel="stylesheet" href="https://pub.mdpi-res.com/assets/css/slick.css?f38b2db10e01b157?1732286508"> <meta name="title" content="Multiparameter Flow Cytometric Analysis of the Conventional and Monocyte-Derived DC Compartment in the Murine Spleen"> <meta name="description" content="Dendritic cells (DCs) are present in almost all tissues, where they act as sentinels involved in innate recognition and the initiation of adaptive immune responses. The DC family consists of several cell lineages that are heterogenous in their development, phenotype, and function. Within these DC lineages, further subdivisions exist, resulting in smaller, less characterized subpopulations, each with its unique immunomodulatory capabilities. Given the interest in utilizing DC for experimental studies and for vaccination purposes, it becomes increasingly crucial to thoroughly classify and characterize these diverse DC subpopulations. This understanding is vital for comprehending their relative contribution to the initiation, regulation, and propagation of immune responses. To facilitate such investigation, we here provide an easy and ready-to-use multicolor flow cytometry staining panel for the analysis of conventional DC, plasmacytoid DC, and monocyte-derived DC populations isolated from mouse spleens. This adaptable panel can be easily customized for the analysis of other tissue-specific DC populations, providing a valuable tool for DC research." > <link rel="image_src" href="https://pub.mdpi-res.com/img/journals/vaccines-logo.png?8600e93ff98dbf14" > <meta name="dc.title" content="Multiparameter Flow Cytometric Analysis of the Conventional and Monocyte-Derived DC Compartment in the Murine Spleen"> <meta name="dc.creator" content="Ronald A. Backer"> <meta name="dc.creator" content="Hans Christian Probst"> <meta name="dc.creator" content="Björn E. Clausen"> <meta name="dc.type" content="Protocol"> <meta name="dc.source" content="Vaccines 2024, Vol. 12, Page 1294"> <meta name="dc.date" content="2024-11-19"> <meta name ="dc.identifier" content="10.3390/vaccines12111294"> <meta name="dc.publisher" content="Multidisciplinary Digital Publishing Institute"> <meta name="dc.rights" content="http://creativecommons.org/licenses/by/3.0/"> <meta name="dc.format" content="application/pdf" > <meta name="dc.language" content="en" > <meta name="dc.description" content="Dendritic cells (DCs) are present in almost all tissues, where they act as sentinels involved in innate recognition and the initiation of adaptive immune responses. The DC family consists of several cell lineages that are heterogenous in their development, phenotype, and function. Within these DC lineages, further subdivisions exist, resulting in smaller, less characterized subpopulations, each with its unique immunomodulatory capabilities. Given the interest in utilizing DC for experimental studies and for vaccination purposes, it becomes increasingly crucial to thoroughly classify and characterize these diverse DC subpopulations. This understanding is vital for comprehending their relative contribution to the initiation, regulation, and propagation of immune responses. To facilitate such investigation, we here provide an easy and ready-to-use multicolor flow cytometry staining panel for the analysis of conventional DC, plasmacytoid DC, and monocyte-derived DC populations isolated from mouse spleens. This adaptable panel can be easily customized for the analysis of other tissue-specific DC populations, providing a valuable tool for DC research." > <meta name="dc.subject" content="dendritic cell" > <meta name="dc.subject" content="dendritic cell subpopulations" > <meta name="dc.subject" content="macrophages" > <meta name="dc.subject" content="monocytes" > <meta name="dc.subject" content="multicolor flow cytometry" > <meta name="dc.subject" content="myeloid cells" > <meta name="dc.subject" content="spleen" > <meta name ="prism.issn" content="2076-393X"> <meta name ="prism.publicationName" content="Vaccines"> <meta name ="prism.publicationDate" content="2024-11-19"> <meta name ="prism.volume" content="12"> <meta name ="prism.number" content="11"> <meta name ="prism.section" content="Protocol" > <meta name ="prism.startingPage" content="1294" > <meta name="citation_issn" content="2076-393X"> <meta name="citation_journal_title" content="Vaccines"> <meta name="citation_publisher" content="Multidisciplinary Digital Publishing Institute"> <meta name="citation_title" content="Multiparameter Flow Cytometric Analysis of the Conventional and Monocyte-Derived DC Compartment in the Murine Spleen"> <meta name="citation_publication_date" content="2024/11"> <meta name="citation_online_date" content="2024/11/19"> <meta name="citation_volume" content="12"> <meta name="citation_issue" content="11"> <meta name="citation_firstpage" content="1294"> <meta name="citation_author" content="Backer, Ronald A."> <meta name="citation_author" content="Probst, Hans Christian"> <meta name="citation_author" content="Clausen, Björn E."> <meta name="citation_doi" content="10.3390/vaccines12111294"> <meta name="citation_id" content="mdpi-vaccines12111294"> <meta name="citation_abstract_html_url" content="https://www.mdpi.com/2076-393X/12/11/1294"> <meta name="citation_pdf_url" content="https://www.mdpi.com/2076-393X/12/11/1294/pdf?version=1732162568"> <link rel="alternate" type="application/pdf" title="PDF Full-Text" href="https://www.mdpi.com/2076-393X/12/11/1294/pdf?version=1732162568"> <meta name="fulltext_pdf" content="https://www.mdpi.com/2076-393X/12/11/1294/pdf?version=1732162568"> <meta name="citation_fulltext_html_url" content="https://www.mdpi.com/2076-393X/12/11/1294/htm"> <link rel="alternate" type="text/html" title="HTML Full-Text" href="https://www.mdpi.com/2076-393X/12/11/1294/htm"> <meta name="fulltext_html" content="https://www.mdpi.com/2076-393X/12/11/1294/htm"> <link rel="alternate" type="text/xml" title="XML Full-Text" href="https://www.mdpi.com/2076-393X/12/11/1294/xml"> <meta name="fulltext_xml" content="https://www.mdpi.com/2076-393X/12/11/1294/xml"> <meta name="citation_xml_url" content="https://www.mdpi.com/2076-393X/12/11/1294/xml"> <meta name="twitter:card" content="summary" /> <meta name="twitter:site" content="@MDPIOpenAccess" /> <meta name="twitter:image" content="https://pub.mdpi-res.com/img/journals/vaccines-logo-social.png?8600e93ff98dbf14" /> <meta property="fb:app_id" content="131189377574"/> <meta property="og:site_name" content="MDPI"/> <meta property="og:type" content="article"/> <meta property="og:url" content="https://www.mdpi.com/2076-393X/12/11/1294" /> <meta property="og:title" content="Multiparameter Flow Cytometric Analysis of the Conventional and Monocyte-Derived DC Compartment in the Murine Spleen" /> <meta property="og:description" content="Dendritic cells (DCs) are present in almost all tissues, where they act as sentinels involved in innate recognition and the initiation of adaptive immune responses. The DC family consists of several cell lineages that are heterogenous in their development, phenotype, and function. Within these DC lineages, further subdivisions exist, resulting in smaller, less characterized subpopulations, each with its unique immunomodulatory capabilities. Given the interest in utilizing DC for experimental studies and for vaccination purposes, it becomes increasingly crucial to thoroughly classify and characterize these diverse DC subpopulations. This understanding is vital for comprehending their relative contribution to the initiation, regulation, and propagation of immune responses. To facilitate such investigation, we here provide an easy and ready-to-use multicolor flow cytometry staining panel for the analysis of conventional DC, plasmacytoid DC, and monocyte-derived DC populations isolated from mouse spleens. This adaptable panel can be easily customized for the analysis of other tissue-specific DC populations, providing a valuable tool for DC research." /> <meta property="og:image" content="https://pub.mdpi-res.com/vaccines/vaccines-12-01294/article_deploy/html/images/vaccines-12-01294-g001-550.jpg?1732162784" /> <link rel="alternate" type="application/rss+xml" title="MDPI Publishing - Latest articles" href="https://www.mdpi.com/rss"> <meta name="google-site-verification" content="PxTlsg7z2S00aHroktQd57fxygEjMiNHydKn3txhvwY"> <meta name="facebook-domain-verification" content="mcoq8dtq6sb2hf7z29j8w515jjoof7" /> <script id="Cookiebot" data-cfasync="false" src="https://consent.cookiebot.com/uc.js" data-cbid="51491ddd-fe7a-4425-ab39-69c78c55829f" type="text/javascript" async></script>  <script type="text/plain" data-cookieconsent="statistics"> (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start': new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0], j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src= 'https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f); 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class='html-article-content'> <span itemprop="publisher" content="Multidisciplinary Digital Publishing Institute"></span><span itemprop="url" content="https://www.mdpi.com/2076-393X/12/11/1294"></span> <div class="article-icons"><span class="label openaccess" data-dropdown="drop-article-label-openaccess" aria-expanded="false">Open Access</span><span class="label articletype">Protocol</span></div> <h1 class="title hypothesis_container" itemprop="name"> Multiparameter Flow Cytometric Analysis of the Conventional and Monocyte-Derived DC Compartment in the Murine Spleen </h1> <div class="art-authors hypothesis_container"> by <span class="inlineblock "><div class='profile-card-drop' data-dropdown='profile-card-drop13417938' data-options='is_hover:true, hover_timeout:5000'> Ronald A. Backer</div><div id="profile-card-drop13417938" data-dropdown-content class="f-dropdown content profile-card-content" aria-hidden="true" tabindex="-1"><div class="profile-card__title"><div class="sciprofiles-link" style="display: inline-block"><div class="sciprofiles-link__link"><img class="sciprofiles-link__image" src="/bundles/mdpisciprofileslink/img/unknown-user.png" style="width: auto; height: 16px; border-radius: 50%;"><span class="sciprofiles-link__name">Ronald A. 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Clausen</div><div id="profile-card-drop13417940" data-dropdown-content class="f-dropdown content profile-card-content" aria-hidden="true" tabindex="-1"><div class="profile-card__title"><div class="sciprofiles-link" style="display: inline-block"><div class="sciprofiles-link__link"><img class="sciprofiles-link__image" src="/profiles/3542191/thumb/Björn_Erik_CLAUSEN.png" style="width: auto; height: 16px; border-radius: 50%;"><span class="sciprofiles-link__name">Björn E. Clausen</span></div></div></div><div class="profile-card__buttons" style="margin-bottom: 10px;"><a href="https://sciprofiles.com/profile/3542191?utm_source=mdpi.com&utm_medium=website&utm_campaign=avatar_name" class="button button--color-inversed" target="_blank"> SciProfiles </a><a href="https://scilit.net/scholars?q=Bj%C3%B6rn%20E.%20Clausen" class="button button--color-inversed" target="_blank"> Scilit </a><a href="https://www.preprints.org/search?search1=Bj%C3%B6rn%20E.%20Clausen&field1=authors" class="button button--color-inversed" target="_blank"> Preprints.org </a><a href="https://scholar.google.com/scholar?q=Bj%C3%B6rn%20E.%20Clausen" class="button button--color-inversed" target="_blank" rels="noopener noreferrer"> Google Scholar </a></div></div><sup> 1,2,*</sup><span style="display: inline; margin-left: 5px;"></span><a class="toEncode emailCaptcha visibility-hidden" data-author-id="13417940" href="/cdn-cgi/l/email-protection#e1ce828f85cc828688ce8dce848c80888dcc91938e95848295888e8fc2d1d1d1d0d7d3d184d1d2d0d6d0d0d1d6d182d3d3d0d6d182d183d587d187d1d2d183d182d0d9d582d1d7d1d6"><sup><i class="fa fa-envelope-o"></i></sup></a><a href="https://orcid.org/0000-0002-2484-7842" target="_blank" rel="noopener noreferrer"><img src="https://pub.mdpi-res.com/img/design/orcid.png?0465bc3812adeb52?1732286508" title="ORCID" style="position: relative; width: 13px; margin-left: 3px; max-width: 13px !important; height: auto; top: -5px;"></a></span> </div> <div class="nrm"></div> <span style="display:block; height:6px;"></span> <div></div> <div style="margin: 5px 0 15px 0;" class="hypothesis_container"> <div class="art-affiliations"> <div class="affiliation "> <div class="affiliation-item"><sup>1</sup></div> <div class="affiliation-name ">Institute for Molecular Medicine, Paul Klein Center for Immune Intervention, University Medical Center of the Johannes Gutenberg-University Mainz, 55131 Mainz, Germany</div> </div> <div class="affiliation "> <div class="affiliation-item"><sup>2</sup></div> <div class="affiliation-name ">Research Center for Immunotherapy (FZI), University Medical Center of the Johannes Gutenberg-University Mainz, 55131 Mainz, Germany</div> </div> <div class="affiliation "> <div class="affiliation-item"><sup>3</sup></div> <div class="affiliation-name ">Institute for Immunology, Paul Klein Center for Immune Intervention, University Medical Center of the Johannes Gutenberg-University Mainz, 55131 Mainz, Germany</div> </div> <div class="affiliation"> <div class="affiliation-item"><sup>*</sup></div> <div class="affiliation-name ">Authors to whom correspondence should be addressed. </div> </div> </div> </div> <div class="bib-identity" style="margin-bottom: 10px;"> <em>Vaccines</em> <b>2024</b>, <em>12</em>(11), 1294; <a href="https://doi.org/10.3390/vaccines12111294">https://doi.org/10.3390/vaccines12111294</a> </div> <div class="pubhistory" style="font-weight: bold; padding-bottom: 10px;"> <span style="display: inline-block">Submission received: 24 September 2024</span> / <span style="display: inline-block">Revised: 4 November 2024</span> / <span style="display: inline-block">Accepted: 15 November 2024</span> / <span style="display: inline-block">Published: 19 November 2024</span> </div> <div class="belongsTo" style="margin-bottom: 10px;"> (This article belongs to the Special Issue <a href=" /journal/vaccines/special_issues/7Z22K5C023 ">Dendritic Cells (DCs) and Cancer Immunotherapy</a>)<br/> </div> <div class="highlight-box1"> <div class="download"> <a class="button button--color-inversed button--drop-down" data-dropdown="drop-download-1524492" aria-controls="drop-supplementary-1524492" aria-expanded="false"> Download <i class="material-icons">keyboard_arrow_down</i> </a> <div id="drop-download-1524492" class="f-dropdown label__btn__dropdown label__btn__dropdown--button" data-dropdown-content aria-hidden="true" tabindex="-1"> <a class="UD_ArticlePDF" href="/2076-393X/12/11/1294/pdf?version=1732162568" data-name="Multiparameter Flow Cytometric Analysis of the Conventional and Monocyte-Derived DC Compartment in the Murine Spleen" data-journal="vaccines">Download PDF</a> <br/> <a id="js-pdf-with-cover-access-captcha" href="#" data-target="/2076-393X/12/11/1294/pdf-with-cover" class="accessCaptcha">Download PDF with Cover</a> <br/> <a id="js-xml-access-captcha" href="#" data-target="/2076-393X/12/11/1294/xml" class="accessCaptcha">Download XML</a> <br/> <a href="/2076-393X/12/11/1294/epub" id="epub_link">Download Epub</a> <br/> <a href="javascript:void(0);" data-reveal-id="supplementaryModal">Download Supplementary Material</a> <br/> </div> <div class="js-browse-figures" style="display: inline-block;"> <a href="#" class="button button--color-inversed margin-bottom-10 openpopupgallery UI_BrowseArticleFigures" data-target='article-popup' data-counterslink = "https://www.mdpi.com/2076-393X/12/11/1294/browse" >Browse Figures</a> </div> <div id="article-popup" class="popupgallery" style="display: inline; line-height: 200%"> <a href="https://pub.mdpi-res.com/vaccines/vaccines-12-01294/article_deploy/html/images/vaccines-12-01294-g001.png?1732162783" title=" <strong>Figure 1</strong><br/> <p>Identification of the major leukocyte and cDC populations in the steady-state murine spleen using a conserved 26-color core-marker FACS panel. (<b>A</b>) Unbiased dimensionality reduction analysis via t-stochastic neighborhood embedding (t-SNE) of all living CD45<sup>+</sup> splenocytes categorizes the major distinct lymphocyte populations (CD4<sup>+</sup> and CD8<sup>+</sup> T cells, B cells), myeloid cell populations (monocytes, macrophages), and DC populations (cDC1s, cDC2s, pDCs). (<b>B</b>) Mapping of XCR1<sup>+</sup> cDC1s and SIRPα<sup>+</sup> cDC2s demonstrates a clear separation of the two main cDC populations in the spleen and illustrates the heterogeneity within each population. Data acquisition was performed using a BD FACSymphony flow cytometer, and data were evaluated using FlowJo software. For t-SNE, CD11c<sup>+</sup>MHC-II<sup>+</sup> cDCs of three wild-type mice were concatenated in FLowJo with 4.000 events per sample. All markers shown in <a href="#vaccines-12-01294-t001" class="html-table">Table 1</a>, as well as FSC-A and SSC-A, were utilized.</p> "> </a> <a href="https://pub.mdpi-res.com/vaccines/vaccines-12-01294/article_deploy/html/images/vaccines-12-01294-g002.png?1732162785" title=" <strong>Figure 2</strong><br/> <p><b>Flow cytometry analysis of the steady-state splenic myeloid cell network.</b> Splenocytes from 8-week-old mice were stained with the described DC panel (<a href="#vaccines-12-01294-t001" class="html-table">Table 1</a> and <a href="#app1-vaccines-12-01294" class="html-app">Supplementary Table S1</a>). (<b>A</b>) Cells were initially gated on single cells using FSC-A and SSC-A gating to eliminate doublets and to exclude debris. Subsequently, living CD45<sup>+</sup> leukocytes were selected using viability-negative gating, followed by the exclusion of T cells (CD90.2<sup>+</sup> cells), B cells (CD19<sup>+</sup> cells), and NK/NKT cells (NK1.1<sup>+</sup>, CD49b<sup>+</sup> cells). (<b>B</b>) Within this lineage-negative cell population, the expression of F4/80 and CD64 marked splenic red pulp macrophages. (<b>C</b>) Subsequently, cDCs are characterized as cells expressing MHC class II (MHC-II) and CD11c. (<b>D</b>) pDCs were identified as positive for PDCA1, while displaying intermediate levels of CD11c. Additionally, pDCs displayed variable expression of CD8α, which might indicate differences in the activation status of these cells. Splenic cDCs can either be separated into CD4<sup>+</sup>CD8α<sup>−</sup>, CD4<sup>−</sup>CD8α<sup>+</sup> and double-negative DCs (<b>E, <span class="html-italic">left</span></b>), or, alternatively, into conventional cDC type 1 (cDC1; XCR1<sup>+</sup>; SIRPα<sup>−</sup>) and type 2 (cDC2; XCR1<sup>−</sup>; SIRPα<sup>+</sup>) subsets (<b>E, <span class="html-italic">right</span></b>). (<b>I</b>) Monocytes were identified as CD11c<sup>−</sup>CX3CR1<sup>+</sup>CD1b<sup>+</sup> cells among the remaining cells and comprise Ly6C<sup>+</sup> (‘pro-inflammatory’) and Ly6C<sup>−</sup> (‘patrolling’) populations (<b>J</b>). (<b>F</b>) Terminally differentiated cDC1s expressed CD8α and (<b>G</b>) consisted of Langerin<sup>+</sup> and Langerin<sup>−</sup> subpopulations. (<b>H</b>) cDC2s comprised two dominant lineages, cDC2As and cDC2Bs, based on the mutually exclusive expression of ESAM and Clec12A, respectively. (<b>K</b>) Next to cDC and pDC the newly characterized non-canonical transitional DC (tDC) are identified as CD11b<sup>−</sup>CX3CR1<sup>+</sup> cells. tDC are further divided into Ly6C positive (‘pDC-like’) and Ly6C negative (‘cDC-like’) populations, each with different functional characteristics. Depicted is one exemplary gating strategy. Data acquisition was performed using a BD FACSymphony flow cytometer, and data analysis was conducted using FlowJo software.</p> "> </a> <a href="https://pub.mdpi-res.com/vaccines/vaccines-12-01294/article_deploy/html/images/vaccines-12-01294-g003.png?1732162787" title=" <strong>Figure 3</strong><br/> <p><b>Phenotypic characterization of cDC1 and cDC2 subpopulations in the murine spleen.</b> (<b>A</b>) Expression of cDC1 markers CD24, CD26, CD103, CD205, and MHC-II on either Langerin<sup>+</sup> (filled, light blue) or Langerin<sup>−</sup> (dark blue lines) cDC1s. (<b>B</b>) Expression of cDC2 markers CD4, CD11b, CD26, CX3CR1, Ly6C, and MHC-II on either ESAM<sup>+</sup> (dark green lines) or ESAM<sup>−</sup> (filled, light green) cDC2s. Single-cell suspensions from the spleen were prepared as described in <a href="#sec2dot2-vaccines-12-01294" class="html-sec">Section 2.2</a> and stained as described in <a href="#vaccines-12-01294-f001" class="html-fig">Figure 1</a> and <a href="#vaccines-12-01294-f002" class="html-fig">Figure 2</a>. Isotype-matched control antibody stainings are indicated with gray lines in the histogram plots. Data acquisition was performed using a BD FACSymphony flow cytometer, and data analysis was carried out using FlowJo software.</p> "> </a> <a href="https://pub.mdpi-res.com/vaccines/vaccines-12-01294/article_deploy/html/images/vaccines-12-01294-g004.png?1732162788" title=" <strong>Figure 4</strong><br/> <p><b>Phenotypic characterization of MoDCs and Inf-cDC2s in the steady-state murine spleen.</b> Frequency of Ly6C<sup>+</sup>CD64<sup>+</sup> MoDCs (<b>A</b>) and MAR-01<sup>+</sup>CD64<sup>+</sup> Inf-cDC2s (<b>B</b>) in the murine spleen. DCs were pre-gated as CD11c<sup>hi</sup>MHCII<sup>+</sup> cells. The gating strategy is based on the expression of either Ly6C<sup>+</sup>CD64<sup>+</sup> or MAR-01<sup>+</sup>CD64<sup>+</sup> on macrophages (CD11c<sup>int</sup>MHCII<sup>+</sup> cells). The FACS plots show one representative mouse/group. Data acquisition was performed using a BD FACSymphony flow cytometer, and data analysis was performed using FlowJo software.</p> "> </a> <a href="https://pub.mdpi-res.com/vaccines/vaccines-12-01294/article_deploy/html/images/vaccines-12-01294-g005.png?1732162789" title=" <strong>Figure 5</strong><br/> <p><b>Characterization of distinct DC populations.</b> This figure summarizes the differentiation pathways and defining markers of the various DC subsets. Conventional DCs (cDCs) differentiate into two main populations: cDC1s and cDC2s, originating from the common DC precursor-derived pre-DC1s and pre-DC2s, respectively. Monocyte-derived DCs (MoDCs) develop from Ly6C<sup>hi</sup> monocytes. In lymphoid organs, cDC1s are characterized by the expression of CD8α, CD24, and XCR1. Within the cDC1 population, a subset expressing CD103 and Langerin can be identified. The cDC2 population constitutes at least 2 distinct subpopulations: ESAM<sup>+</sup> cDC2As and Clec12a<sup>+</sup> cDC2Bs. The exact relationship between inflammatory cDC2s (Inf-cDC2s) and other DCs remains unclear. Key lineage-defining markers for each DC population are highlighted and identifiable through the outlined protocol.</p> "> </a> </div> <a class="button button--color-inversed" href="/2076-393X/12/11/1294/review_report">Review Reports</a> <a class="button button--color-inversed" href="/2076-393X/12/11/1294/notes">Versions Notes</a> </div> </div> <div class="responsive-moving-container small hidden" data-id="article-counters" style="margin-top: 15px;"></div> <div class="html-dynamic"> <section> <div class="art-abstract art-abstract-new in-tab hypothesis_container"> <p> <div><section class="html-abstract" id="html-abstract"> <h2 id="html-abstract-title">Abstract</h2><b>:</b> <div class="html-p">Dendritic cells (DCs) are present in almost all tissues, where they act as sentinels involved in innate recognition and the initiation of adaptive immune responses. The DC family consists of several cell lineages that are heterogenous in their development, phenotype, and function. Within these DC lineages, further subdivisions exist, resulting in smaller, less characterized subpopulations, each with its unique immunomodulatory capabilities. Given the interest in utilizing DC for experimental studies and for vaccination purposes, it becomes increasingly crucial to thoroughly classify and characterize these diverse DC subpopulations. This understanding is vital for comprehending their relative contribution to the initiation, regulation, and propagation of immune responses. To facilitate such investigation, we here provide an easy and ready-to-use multicolor flow cytometry staining panel for the analysis of conventional DC, plasmacytoid DC, and monocyte-derived DC populations isolated from mouse spleens. This adaptable panel can be easily customized for the analysis of other tissue-specific DC populations, providing a valuable tool for DC research.</div> </section> <div id="html-keywords"> <div class="html-gwd-group"><div id="html-keywords-title">Keywords: </div><a href="/search?q=dendritic+cell">dendritic cell</a>; <a href="/search?q=dendritic+cell+subpopulations">dendritic cell subpopulations</a>; <a href="/search?q=macrophages">macrophages</a>; <a href="/search?q=monocytes">monocytes</a>; <a href="/search?q=multicolor+flow+cytometry">multicolor flow cytometry</a>; <a href="/search?q=myeloid+cells">myeloid cells</a>; <a href="/search?q=spleen">spleen</a></div> <div> </div> </div> </div> </p> </div> </section> </div> <div class="hypothesis_container"> <ul class="menu html-nav" data-prev-node="#html-quick-links-title"> </ul> <div class="html-body"> <section id='sec1-vaccines-12-01294' type='intro'><h2 data-nested='1'> 1. Introduction</h2><div class='html-p'>The dendritic cell (DC) family comprises a remarkably diverse group of cells that, despite distinct developmental characteristics, share critical functions such as innate pathogen detection, antigen (Ag) presentation, and cytokine production. As such, DCs play pivotal roles in orchestrating a broad spectrum of innate and adaptive immune responses towards pathogens, allergens, and cancer. Broadly categorized, DCs fall into three distinct classes: conventional (or classical) DCs (cDCs), plasmacytoid DCs (pDCs), and monocyte-derived DCs (MoDCs). Among these, cDCs are the most potent Ag-presenting cells, playing crucial roles in eliciting Ag-specific CD4<sup>+</sup> and CD8<sup>+</sup> T cell responses, as well as the initiation of innate immunity [<a href="#B1-vaccines-12-01294" class="html-bibr">1</a>,<a href="#B2-vaccines-12-01294" class="html-bibr">2</a>,<a href="#B3-vaccines-12-01294" class="html-bibr">3</a>,<a href="#B4-vaccines-12-01294" class="html-bibr">4</a>,<a href="#B5-vaccines-12-01294" class="html-bibr">5</a>]. On the other hand, while pDCs are poor in Ag presentation, they exhibit specialization in type-I interferon production, particularly during viral infection [<a href="#B6-vaccines-12-01294" class="html-bibr">6</a>,<a href="#B7-vaccines-12-01294" class="html-bibr">7</a>]. Meanwhile, MoDCs predominantly emerge in specific inflammatory conditions, serving as an emergency source of DC at the site of infection [<a href="#B8-vaccines-12-01294" class="html-bibr">8</a>,<a href="#B9-vaccines-12-01294" class="html-bibr">9</a>].</div><div class='html-p'>Current DC research focuses on harnessing individual DC populations for cancer immunotherapy and vaccination strategies [<a href="#B10-vaccines-12-01294" class="html-bibr">10</a>]. However, the phenotypic overlap among several DC populations complicates the identification of their specific immunomodulatory functions. This is particularly evident with type 2 cDC (cDC2) and MoDC, whose phenotypes often converge, especially during inflammation, causing confusion regarding their individual immune regulatory functions [<a href="#B8-vaccines-12-01294" class="html-bibr">8</a>,<a href="#B11-vaccines-12-01294" class="html-bibr">11</a>,<a href="#B12-vaccines-12-01294" class="html-bibr">12</a>,<a href="#B13-vaccines-12-01294" class="html-bibr">13</a>,<a href="#B14-vaccines-12-01294" class="html-bibr">14</a>,<a href="#B15-vaccines-12-01294" class="html-bibr">15</a>]. Additionally, our understanding of the phenotypic and functional heterogeneity within the cDC1/cDC2 populations, including the existence of tissue-specific subsets and their precise functions, remains limited [<a href="#B1-vaccines-12-01294" class="html-bibr">1</a>,<a href="#B12-vaccines-12-01294" class="html-bibr">12</a>,<a href="#B16-vaccines-12-01294" class="html-bibr">16</a>,<a href="#B17-vaccines-12-01294" class="html-bibr">17</a>,<a href="#B18-vaccines-12-01294" class="html-bibr">18</a>]. Therefore, the discrimination of the DC network into clearly delineated lineages is crucial for gaining a more complete understanding of how individual DC subsets contribute to the regulation of immune responses. To this end, here, we present an easy and ready-to-use protocol for flow cytometric analysis of the distinct DC populations in the murine spleen, encompassing cDC1 and cDC2 subpopulations, pDC, and monocyte/macrophage populations.</div><div class='html-p'><b>Objective and purpose of this protocol:</b> While recent technical advances, particularly single-cell RNA sequencing approaches, have facilitated the identification of novel DC lineage-specific markers, many of these markers, such as transcription factors, do not always enable the precise and satisfactory distinction of DC subsets by flow cytometry, especially during functional in vivo and in vitro studies. This protocol utilizes a conserved 26-color core-marker panel to achieve a precise and refined phenotypic characterization of these cells, thereby greatly advancing our understanding of the distinct DC lineages. Given that the DC network is highly conserved, our analysis may also serve as a robust basis for identifying DCs across various tissues with minimal modifications.</div></section><section id='sec2-vaccines-12-01294' type=''><h2 data-nested='1'> 2. Materials and Methods</h2><div class='html-p'>Our DC staining panel was optimized for use with the BD Biosciences FACSymphony™ A5 cell analyzer, featuring five lasers (355 nm, 405 nm, 488 nm, 561 nm, and 637 nm) and up to 50 detectors. The materials and methods, including the antibody details and dilutions used, are provided in <a href="#vaccines-12-01294-t001" class="html-table">Table 1</a> and <a href="#vaccines-12-01294-t002" class="html-table">Table 2</a>, as well as the <a href="#app1-vaccines-12-01294" class="html-app">Supporting Information (Supplementary Information, including Tables S1 and S2)</a>.</div><section id='sec2dot1-vaccines-12-01294' type=''><h4 class='html-italic' data-nested='2'> 2.1. Mice</h4><div class='html-p'>Eight-week-old male C57BL/6 mice were housed at a barrier-free and specific pathogen-free facility at the Translational Animal Research Center of the University Medical Center Mainz (Mainz, Germany). All mice were used in accordance with institutional and national animal experimentation guidelines.</div></section><section id='sec2dot2-vaccines-12-01294' type=''><h4 class='html-italic' data-nested='2'> 2.2. Preparation of Single-Cell Suspension from Spleens</h4><div class='html-p'>DCs are typically present in low numbers within the tissue, where they reside as highly adherent cells that are tightly embedded within the extracellular tissue matrix. Consequently, enzymatic digestion of the tissue is a critical step in DC research, because DCs are very sensitive to mechanical stimuli and endotoxin contamination.</div><div class='html-p'>The isolation of splenic DCs by Collagenase Type IV and DNase-I yields a single-cell suspension with a high number of DCs (typically 3–5 × 10<sup>6</sup> CD11c<sup>+</sup> DCs per spleen), while preserving their immature phenotype and cell surface markers for consistent and reproducible flow cytometric characterization [<a href="#B19-vaccines-12-01294" class="html-bibr">19</a>]. For this, mice are euthanized with isoflurane and spleens are collected. After removing any fat tissue, the spleens are cut into grain-sized pieces. These spleen pieces are then incubated in 1 mL RPMI medium containing 200 U/mL of Collagenase Type IV and 0.5 U/mL of DNaseI, with agitation at 37 °C for 30 min or until fully digested. Upon completion of the incubation period, EDTA is added to achieve a final concentration of 10 mM, and the cell suspension is further incubated for 5 min at 4 °C. Undigested material is filtered out, while larger fragments of tissue can be forced through a filter using a 1ml syringe plunger. Subsequently, red blood cells are lysed, and the remaining cells are washed once with PBS supplemented with 10 mM EDTA. If required, cellular debris can be removed by additional filtration steps.</div></section><section id='sec2dot3-vaccines-12-01294' type=''><h4 class='html-italic' data-nested='2'> 2.3. Antibody Staining of Single-Cell Suspensions from Splenic Tissue for Flow Cytometry</h4><section id='sec2dot3dot1-vaccines-12-01294' type=''><h4 class='' data-nested='3'> 2.3.1. Cell Preparation, Antibody Mixtures, and Staining Procedure</h4><div class='html-p'>Please note that detailed information for the staining kit, as well as used buffers and their reagents, are listed as <a href="#app1-vaccines-12-01294" class="html-app">Supplementary Information (Supplementary Materials, Supplementary Tables S1 and S2)</a>.</div><div class='html-p'>Calculate and prepare the first Antibody Master Mix in Brilliant Stain Buffer Plus (BD Biosciences, Franklin Lakes, NJ, USA; order number 566385) containing all antibodies for staining extracellular markers (excluding anti-Langerin antibody). Use 50 µL of Brilliant Stain Buffer Plus per sample and add the antibodies, as specified in <a href="#app1-vaccines-12-01294" class="html-app">Supplementary Tables S1 and S2</a>, at the indicated dilution. Be sure to mix the Master Mix regularly while pipetting the antibodies to avoid clumping.</div><div class='html-p'>Count the cells, centrifuge at 400× <span class='html-italic'>g</span> at 4 °C, and resuspend at a concentration of 20 × 10<sup>6</sup> cells/mL in FACS buffer. Plate 75 μL of the cell suspension (1.5 × 10<sup>6</sup> cells) per well in a U-bottom 96-well plate, including controls and optional stainings for instrument setup.</div><div class='html-p'>Centrifuge the plate containing cells at 400× <span class='html-italic'>g</span> for 5 min at 4 °C. Discard the supernatant and tap the plate upside down on a paper towel. Add Fc-block solution (BioXCell, Lebanon, NJ, USA; order number BE0008; 1:100 dilution) to the cells. Mix thoroughly by pipetting and incubate for 15 min at room temperature. Centrifuge the plate again at 400× <span class='html-italic'>g</span> for 5 min at 4 °C, discard the supernatant, and tap the plate upside down on a paper towel. Next, apply 50 μL of the prepared first Antibody Master Mix onto the cells, mix by pipetting, and incubate for 30 min at 4 °C in the dark. Afterwards, fill the wells with 150 µL FACS buffer, centrifuge at 400× <span class='html-italic'>g</span> for 5 min at 4 °C, discard the supernatant, and tap the plate upside down on a paper towel. Finally, wash the cells by adding 250 μL of FACS buffer before resuspending and centrifugating at 400× <span class='html-italic'>g</span> for 5 min at 4 °C.</div></section><section id='sec2dot3dot2-vaccines-12-01294' type=''><h4 class='' data-nested='3'> 2.3.2. Intracellular Langerin Staining</h4><div class='html-p'>For intracellular antibody staining, fixate cells by adding 200 μL Fix/Perm buffer per well. Incubate for at least 30 min at room temperature in the dark. While incubating, prepare the intracellular antibody staining mix. After the fixation step, centrifuge the plate at 400× <span class='html-italic'>g</span> for 5 min at 4 °C. Discard the supernatant and carefully tap the plate upside down on a paper towel. Wash the cells twice by adding 200 μL Perm/Wash buffer before resuspending and centrifuging again at 400× <span class='html-italic'>g</span> for 5 min at 4 °C. Add 50 μL of the intracellular antibody mix to the cells, mix by pipetting, and incubate for 45 min at 4 °C in the dark. Fill the wells with 150 µL Perm/Wash buffer, centrifuge at 400× <span class='html-italic'>g</span> for 5 min at 4 °C, discard the supernatant, and tap the plate. Finally, wash the cells by adding 250 μL Perm/Wash buffer before resuspending and centrifugation again, repeating the wash step.</div></section><section id='sec2dot3dot3-vaccines-12-01294' type=''><h4 class='' data-nested='3'> 2.3.3. Sample Acquisition</h4><div class='html-p'>Resuspend the samples in 200 µL FACS buffer. Store samples at 4 °C in the dark for use within the next 24 h. After performing the cytometer setup, filter the sample via 70 µm cell filters (Greiner bio-one, Austin, TX, USA; order number 542070) into FACS tubes. Acquire the data with an appropriate flow cytometer. For the current manuscript, a 5-laser BD FACSymphony<sup>TM</sup> A5 instrument was used (BD Biosciences, Franklin Lakes, NJ, USA). Additional information on the used laser lines, mirrors, and optical filters can be found in the <a href="#app1-vaccines-12-01294" class="html-app">Supplementary Information (Supplementary Table S3)</a>. Data were collected after automated color compensation and analyzed using FlowJo software (BD Biosciences, version 10.10.).</div></section></section></section><section id='sec3-vaccines-12-01294' type='results'><h2 data-nested='1'> 3. Results</h2><div class='html-p'>Our standardized 26-color core-marker FACS panel enables the precise identification of the major leukocyte and cDC populations in the steady-state murine spleen (<a href="#vaccines-12-01294-f001" class="html-fig">Figure 1</a>A). Specifically, this panel facilitates the classification of splenocytes into distinct lymphocyte populations (CD4<sup>+</sup> and CD8<sup>+</sup> T cells, B cells) as well as myeloid cell populations (DC, monocytes, macrophages). Additionally, it allows for the differentiation of the highly heterogeneous cDC population into multiple discrete but less characterized XCR1<sup>+</sup> cDC1 and SIRPα<sup>+</sup> cDC2 subpopulations (<a href="#vaccines-12-01294-f001" class="html-fig">Figure 1</a>B). In this staining panel, we used CD90.2 (Thy1.2) as the pan T cell marker because, unlike CD3, it is not downregulated on activated T cells. CD90.2 can be used for the most common inbred mouse strains, including C57BL/6, BALB/c, and CH3.</div><section id='sec3dot1-vaccines-12-01294' type=''><h4 class='html-italic' data-nested='2'> 3.1. Characterization of Dendritic Cell Subsets in Steady-State Mouse Spleen</h4><div class='html-p'>A representative gating strategy for the identification of multiple splenic DC subsets is shown in <a href="#vaccines-12-01294-f002" class="html-fig">Figure 2</a>. After excluding dead cells, using the Fixable Viability Dye FVS780, as well as doublets and debris, immune cells were identified using the pan-hematopoietic marker CD45. From this CD45<sup>+</sup> cell population, T cells (CD90.2<sup>+</sup>), B cells (CD19<sup>+</sup>), and NK/NKT cells (NK1.1<sup>+</sup>CD49b<sup>+</sup>) were eliminated to enrich for DC, macrophages, and monocytes, collectively marked as lineage-negative cells (<a href="#vaccines-12-01294-f002" class="html-fig">Figure 2</a>A).</div><div class='html-p'>Within the lineage-negative cell population, macrophages are identified as F4/80<sup>+</sup>CD64<sup>+</sup> cells (<a href="#vaccines-12-01294-f002" class="html-fig">Figure 2</a>B). Among the remaining cells, cDCs express MHC class II (MHC-II) and CD11c (<a href="#vaccines-12-01294-f002" class="html-fig">Figure 2</a>C). As macrophages can express these prototypical cDC markers as well, bona fide cDCs can be separated from contaminating macrophages by staining for CD26 and CD64 expression, respectively (<a href="#app1-vaccines-12-01294" class="html-app">Supplementary Figure S1</a>). Subsequently, pDCs are identified based on their PDCA1 expression, characterized further by low CD11c expression (<a href="#vaccines-12-01294-f002" class="html-fig">Figure 2</a>D), and can be further classified as MHC-II<sup>lo</sup>B220<sup>hi</sup>CD45RA<sup>+</sup>Siglec-H<sup>+</sup> cells (<a href="#vaccines-12-01294-t003" class="html-table">Table 3</a>). Based on the expression of CD8α and -β, pDCs can be further divided into three subsets [<a href="#B20-vaccines-12-01294" class="html-bibr">20</a>,<a href="#B21-vaccines-12-01294" class="html-bibr">21</a>]. The CD8α<sup>+</sup> subset, involved in the induction of FOXP3<sup>+</sup> regulatory T cells, is present in the spleen, lung, and lymph nodes (LNs).).</div><div class="html-fig-wrap" id="vaccines-12-01294-f002"> <div class='html-fig_img'> <div class="html-figpopup html-figpopup-link" data-counterslinkmanual = "https://www.mdpi.com/2076-393X/12/11/1294/display" href="#fig_body_display_vaccines-12-01294-f002"> <img data-large="/vaccines/vaccines-12-01294/article_deploy/html/images/vaccines-12-01294-g002.png" data-original="/vaccines/vaccines-12-01294/article_deploy/html/images/vaccines-12-01294-g002.png" alt="Vaccines 12 01294 g002" data-lsrc="/vaccines/vaccines-12-01294/article_deploy/html/images/vaccines-12-01294-g002-550.jpg" /> <a class="html-expand html-figpopup" data-counterslinkmanual = "https://www.mdpi.com/2076-393X/12/11/1294/display" href="#fig_body_display_vaccines-12-01294-f002"></a> </div> </div> <div class="html-fig_description"> <b>Figure 2.</b> <b>Flow cytometry analysis of the steady-state splenic myeloid cell network.</b> Splenocytes from 8-week-old mice were stained with the described DC panel (<a href="#vaccines-12-01294-t001" class="html-table">Table 1</a> and <a href="#app1-vaccines-12-01294" class="html-app">Supplementary Table S1</a>). (<b>A</b>) Cells were initially gated on single cells using FSC-A and SSC-A gating to eliminate doublets and to exclude debris. Subsequently, living CD45<sup>+</sup> leukocytes were selected using viability-negative gating, followed by the exclusion of T cells (CD90.2<sup>+</sup> cells), B cells (CD19<sup>+</sup> cells), and NK/NKT cells (NK1.1<sup>+</sup>, CD49b<sup>+</sup> cells). (<b>B</b>) Within this lineage-negative cell population, the expression of F4/80 and CD64 marked splenic red pulp macrophages. (<b>C</b>) Subsequently, cDCs are characterized as cells expressing MHC class II (MHC-II) and CD11c. (<b>D</b>) pDCs were identified as positive for PDCA1, while displaying intermediate levels of CD11c. Additionally, pDCs displayed variable expression of CD8α, which might indicate differences in the activation status of these cells. Splenic cDCs can either be separated into CD4<sup>+</sup>CD8α<sup>−</sup>, CD4<sup>−</sup>CD8α<sup>+</sup> and double-negative DCs (<b>E, <span class='html-italic'>left</span></b>), or, alternatively, into conventional cDC type 1 (cDC1; XCR1<sup>+</sup>; SIRPα<sup>−</sup>) and type 2 (cDC2; XCR1<sup>−</sup>; SIRPα<sup>+</sup>) subsets (<b>E, <span class='html-italic'>right</span></b>). (<b>I</b>) Monocytes were identified as CD11c<sup>−</sup>CX3CR1<sup>+</sup>CD1b<sup>+</sup> cells among the remaining cells and comprise Ly6C<sup>+</sup> (‘pro-inflammatory’) and Ly6C<sup>−</sup> (‘patrolling’) populations (<b>J</b>). (<b>F</b>) Terminally differentiated cDC1s expressed CD8α and (<b>G</b>) consisted of Langerin<sup>+</sup> and Langerin<sup>−</sup> subpopulations. (<b>H</b>) cDC2s comprised two dominant lineages, cDC2As and cDC2Bs, based on the mutually exclusive expression of ESAM and Clec12A, respectively. (<b>K</b>) Next to cDC and pDC the newly characterized non-canonical transitional DC (tDC) are identified as CD11b<sup>−</sup>CX3CR1<sup>+</sup> cells. tDC are further divided into Ly6C positive (‘pDC-like’) and Ly6C negative (‘cDC-like’) populations, each with different functional characteristics. Depicted is one exemplary gating strategy. Data acquisition was performed using a BD FACSymphony flow cytometer, and data analysis was conducted using FlowJo software.  </div> </div> <div class="html-fig_show mfp-hide" id="fig_body_display_vaccines-12-01294-f002"> <div class="html-caption"> <b>Figure 2.</b> <b>Flow cytometry analysis of the steady-state splenic myeloid cell network.</b> Splenocytes from 8-week-old mice were stained with the described DC panel (<a href="#vaccines-12-01294-t001" class="html-table">Table 1</a> and <a href="#app1-vaccines-12-01294" class="html-app">Supplementary Table S1</a>). (<b>A</b>) Cells were initially gated on single cells using FSC-A and SSC-A gating to eliminate doublets and to exclude debris. Subsequently, living CD45<sup>+</sup> leukocytes were selected using viability-negative gating, followed by the exclusion of T cells (CD90.2<sup>+</sup> cells), B cells (CD19<sup>+</sup> cells), and NK/NKT cells (NK1.1<sup>+</sup>, CD49b<sup>+</sup> cells). (<b>B</b>) Within this lineage-negative cell population, the expression of F4/80 and CD64 marked splenic red pulp macrophages. (<b>C</b>) Subsequently, cDCs are characterized as cells expressing MHC class II (MHC-II) and CD11c. (<b>D</b>) pDCs were identified as positive for PDCA1, while displaying intermediate levels of CD11c. Additionally, pDCs displayed variable expression of CD8α, which might indicate differences in the activation status of these cells. Splenic cDCs can either be separated into CD4<sup>+</sup>CD8α<sup>−</sup>, CD4<sup>−</sup>CD8α<sup>+</sup> and double-negative DCs (<b>E, <span class='html-italic'>left</span></b>), or, alternatively, into conventional cDC type 1 (cDC1; XCR1<sup>+</sup>; SIRPα<sup>−</sup>) and type 2 (cDC2; XCR1<sup>−</sup>; SIRPα<sup>+</sup>) subsets (<b>E, <span class='html-italic'>right</span></b>). (<b>I</b>) Monocytes were identified as CD11c<sup>−</sup>CX3CR1<sup>+</sup>CD1b<sup>+</sup> cells among the remaining cells and comprise Ly6C<sup>+</sup> (‘pro-inflammatory’) and Ly6C<sup>−</sup> (‘patrolling’) populations (<b>J</b>). (<b>F</b>) Terminally differentiated cDC1s expressed CD8α and (<b>G</b>) consisted of Langerin<sup>+</sup> and Langerin<sup>−</sup> subpopulations. (<b>H</b>) cDC2s comprised two dominant lineages, cDC2As and cDC2Bs, based on the mutually exclusive expression of ESAM and Clec12A, respectively. (<b>K</b>) Next to cDC and pDC the newly characterized non-canonical transitional DC (tDC) are identified as CD11b<sup>−</sup>CX3CR1<sup>+</sup> cells. tDC are further divided into Ly6C positive (‘pDC-like’) and Ly6C negative (‘cDC-like’) populations, each with different functional characteristics. Depicted is one exemplary gating strategy. Data acquisition was performed using a BD FACSymphony flow cytometer, and data analysis was conducted using FlowJo software.</div> <div class="html-img"><img data-large="/vaccines/vaccines-12-01294/article_deploy/html/images/vaccines-12-01294-g002.png" data-original="/vaccines/vaccines-12-01294/article_deploy/html/images/vaccines-12-01294-g002.png" alt="Vaccines 12 01294 g002" data-lsrc="/vaccines/vaccines-12-01294/article_deploy/html/images/vaccines-12-01294-g002.png" /></div> </div> <div class="html-table-wrap" id="vaccines-12-01294-t003"> <div class="html-table_wrap_td"> <div class="html-tablepopup html-tablepopup-link" data-counterslinkmanual = "https://www.mdpi.com/2076-393X/12/11/1294/display" href='#table_body_display_vaccines-12-01294-t003'> <img data-lsrc="https://pub.mdpi-res.com/img/table.png" /> <a class="html-expand html-tablepopup" data-counterslinkmanual = "https://www.mdpi.com/2076-393X/12/11/1294/display" href="#table_body_display_vaccines-12-01294-t003"></a> </div> </div> <div class="html-table_wrap_discription"> <b>Table 3.</b> Summary of marker expression on analyzed cell populations. </div> </div> <div class="html-table_show mfp-hide " id="table_body_display_vaccines-12-01294-t003"> <div class="html-caption"><b>Table 3.</b> Summary of marker expression on analyzed cell populations.</div> <table > <thead ><tr ><th align='center' valign='middle' style='border-top:solid thin;border-bottom:solid thin;background:#BFBFBF' class='html-align-center' >Cell Population</th><th align='center' valign='middle' style='border-top:solid thin;border-bottom:solid thin;background:#BFBFBF' class='html-align-center' >Marker-Negative</th><th align='center' valign='middle' style='border-top:solid thin;border-bottom:solid thin;background:#BFBFBF' class='html-align-center' >Marker-Positive</th></tr></thead><tbody ><tr ><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >cDC1</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Lineage, CD11b, SIRPα, Ly6G, Siglec-F</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >CD8α, CD11c, CD24, CD26, CD205, MHC-II, XCR1, Dectin-1<sup>+/−</sup></td></tr><tr ><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Langerin<sup>+</sup> cDC1</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' > </td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >CD103, Langerin</td></tr><tr ><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >cDC2</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Lineage, CD8α, CD24, CD205, XCR1, Ly6G, Siglec-F</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >CD11c, CD26, CD11b, MHC-II, SIRPα, Dectin-1<sup>+/−</sup></td></tr><tr ><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >cDC2A</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' > </td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >CD4, ESAM</td></tr><tr ><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >cDC2B</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' > </td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Clec12A, CX3CR1, Ly6C</td></tr><tr ><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Plasmacytoid DCs (pDCs)</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Lineage, MHC-II, CD64</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Ly6C, PDCA-1, SIRPα, CD8α<sup>+/−</sup></td></tr><tr ><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Macrophages</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Lineage, CD26, Ly6G, Siglec-F, XCR1</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >CD11c, CD11b, CD64, F4/80, FcεR1a, MHC-II, MerTK, SIRPα</td></tr><tr ><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Monocytes</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Lineage, CD11c, MHC-II, Ly6G, Siglec-F</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >CD11b, CD64, CX3CR1, Ly6C<sup>+/−</sup></td></tr><tr ><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Mo-DC</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Lineage, CD26, Ly6G</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >CD11c, CD11b, CD64, Ly6C, MHC-II, SIRPα</td></tr><tr ><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Inflammatory DC (Inf-cDC2)</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Lineage, XCR1</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >CD11c, CD26, CD64, FcεR1a, MHC-II, SIRPα</td></tr></tbody> </table> <div class='html-table_foot html-p'><div class='html-p' style='text-indent:0em;'><span class='html-fn-content'><span class='html-italic'>Lineage: L/D, CD19, CD49b, CD90.2, NK1.1; +/−: subset- or activation-status-dependent expression</span>.</span></div><div style='clear:both;'></div></div> </div> <div class='html-p'>Historically, cDCs were, analogous to T cells, subdivided into different populations based on CD4 and CD8α surface expression (note that cDCs express CD8 as an αα homodimer and not, like T cells, as an αβ heterodimer) (<a href="#vaccines-12-01294-f002" class="html-fig">Figure 2</a>E, <span class='html-italic'>left</span>). Following this classification, CD4<sup>+</sup>CD8α<sup>−</sup> and double-negative cDCs both express CD11b and were often termed myeloid-related DCs. In contrast, CD4<sup>−</sup>CD8α<sup>+</sup> cDCs are CD11b-negative and were referred to as lymphoid-related cDCs [<a href="#B22-vaccines-12-01294" class="html-bibr">22</a>]. To date, cDCs are rather categorized into type 1 (cDC1) and type 2 (cDC2) populations based on the expression of XCR1 and SIRPα, respectively [<a href="#B11-vaccines-12-01294" class="html-bibr">11</a>,<a href="#B23-vaccines-12-01294" class="html-bibr">23</a>] (<a href="#vaccines-12-01294-f002" class="html-fig">Figure 2</a>E, <span class='html-italic'>right</span>). Here, XCR1<sup>+</sup> cDC1s correspond to the CD4<sup>−</sup>CD8α<sup>+</sup> cDC subset, while SIRPα<sup>+</sup> cDC2s are more heterogeneous and include both CD4<sup>+</sup>CD8α<sup>−</sup> and CD4<sup>−</sup>CD8α<sup>−</sup> cDCs. Generally, cDC1s are crucial for type 1 immune responses during viral infection and tumor surveillance [<a href="#B24-vaccines-12-01294" class="html-bibr">24</a>]. Although the exact function of cDC2s is less clear and likely tissue-dependent, they are implicated in priming type 2 CD4<sup>+</sup> T cell responses [<a href="#B4-vaccines-12-01294" class="html-bibr">4</a>,<a href="#B25-vaccines-12-01294" class="html-bibr">25</a>,<a href="#B26-vaccines-12-01294" class="html-bibr">26</a>] and type 3 immunity by activating ILC3s and Th17 cells [<a href="#B4-vaccines-12-01294" class="html-bibr">4</a>,<a href="#B13-vaccines-12-01294" class="html-bibr">13</a>,<a href="#B27-vaccines-12-01294" class="html-bibr">27</a>].</div><div class='html-p'><b><span class='html-italic'>XCR1<sup>+</sup> cDC1s:</span></b> In humans, both a population of XCR1<sup>+</sup> and XCR1<sup>−</sup> cDC1s can be identified [<a href="#B28-vaccines-12-01294" class="html-bibr">28</a>]. Here, XCR1 expression marks terminally differentiated cDC1s that display a more mature, pre-activated phenotype and are the predominant subset secreting pro-inflammatory cytokines upon TLR stimulation [<a href="#B28-vaccines-12-01294" class="html-bibr">28</a>]. Although XCR1 expression on murine cDC1s is rather homogenous and XCR1<sup>+</sup> cDC1s represent a population that makes up approximately 30% of all splenic cDCs (<a href="#vaccines-12-01294-f002" class="html-fig">Figure 2</a>E). These cells express CD8α, while the small fraction of CD8α<sup>−</sup> cells within this population characterizes less differentiated precursors (<a href="#vaccines-12-01294-f002" class="html-fig">Figure 2</a>F). Additionally, in the spleen, a distinct Langerin/CD207<sup>+</sup> cDC1 subset exists (<a href="#vaccines-12-01294-f002" class="html-fig">Figure 2</a>G). While these Langerin<sup>+</sup> cDC1s are considered a final cDC1 maturation stage, their ontogeny and subset relationship lack definitive evidence. Functionally, Langerin<sup>+</sup> cDC1s play crucial roles in the cross-presentation of circulating apoptotic cells, IL-12p70 production, and the clearance of viral and bacterial pathogens, whereas the functions of Langerin-negative cDC1s are less well-defined [<a href="#B29-vaccines-12-01294" class="html-bibr">29</a>,<a href="#B30-vaccines-12-01294" class="html-bibr">30</a>,<a href="#B31-vaccines-12-01294" class="html-bibr">31</a>,<a href="#B32-vaccines-12-01294" class="html-bibr">32</a>,<a href="#B33-vaccines-12-01294" class="html-bibr">33</a>]. Importantly, cell surface expression of Langerin differs on splenic cDC1s among inbred mouse strains. While Langerin is detectable on splenic cDC1s from BALB/c mice, its expression is nearly absent on splenic cDC1s from C57BL/6 mice, as Langerin expression on these cells occurs primarily intracellularly [<a href="#B34-vaccines-12-01294" class="html-bibr">34</a>]. Apart from the shared expression of CD24, CD26, and CD205, Langerin<sup>+</sup> cDC1s can also be distinguished from their Langerin-negative counterparts by the surface expression of CD103 (<a href="#vaccines-12-01294-f003" class="html-fig">Figure 3</a>A).</div><div class='html-p'><b><span class='html-italic'>SIRP</span><span class='html-italic'>α<sup>+</sup> cDC2s:</span></b> cDC2s comprise a heterogeneous population, with CD11b<sup>+</sup>SIRPα<sup>+</sup> cDC2s representing about 70% of splenic cDCs (<a href="#vaccines-12-01294-f002" class="html-fig">Figure 2</a>E). Recent studies suggest that cDC2s consist of at least two predominant lineages characterized by mutually exclusive expression of the transcription factors T-bet and RORγt [<a href="#B12-vaccines-12-01294" class="html-bibr">12</a>]. T-bet<sup>+</sup> cDC2As are distinguished by high ESAM expression, while RORγt<sup>+</sup> cDC2Bs are ESAM<sup>−</sup> and selectively express Clec12A (<a href="#vaccines-12-01294-f002" class="html-fig">Figure 2</a>H). ESAM<sup>+</sup> cDC2As are proficient in MHC-II Ag presentation and CD4<sup>+</sup> T cell activation but exhibit limited production of pro-inflammatory cytokines, a trait more pronounced in ESAM<sup>−</sup> cDC2Bs [<a href="#B13-vaccines-12-01294" class="html-bibr">13</a>,<a href="#B35-vaccines-12-01294" class="html-bibr">35</a>,<a href="#B36-vaccines-12-01294" class="html-bibr">36</a>]. ESAM<sup>−</sup> cDC2s preferentially express monocyte-associated markers, such as CX3CR1 and Ly6C, and lower levels of the cDC marker CD26 than ESAM<sup>+</sup> cDC2s (<a href="#vaccines-12-01294-f003" class="html-fig">Figure 3</a>B). As a consequence, ESAM<sup>−</sup> cDC2s have sometimes inaccurately been associated with a monocytic origin [<a href="#B8-vaccines-12-01294" class="html-bibr">8</a>,<a href="#B13-vaccines-12-01294" class="html-bibr">13</a>,<a href="#B14-vaccines-12-01294" class="html-bibr">14</a>], but recent findings demonstrate that these cells represent bona fide cDC2 populations with unique immune functions [<a href="#B15-vaccines-12-01294" class="html-bibr">15</a>,<a href="#B19-vaccines-12-01294" class="html-bibr">19</a>].</div><div class='html-p'><b><span class='html-italic'>LN cDCs</span></b>: Both XCR1<sup>+</sup> cDC1s and SIRPα<sup>+</sup> cDC2s are present in most lymphoid and nonlymphoid tissues. We also tested our staining panel on peripheral LN. While LN-resident cDCs reside within these lymphoid organs, cDCs from peripheral tissues travel as migratory cDCs into tissue-draining LNs. Our staining panel allows for the discrimination of these CD11c<sup>hi</sup>MHC-II<sup>+</sup> LN-resident and CD11c<sup>+</sup>MHC-II<sup>hi</sup> LN-migratory cDCs (<a href="#app1-vaccines-12-01294" class="html-app">Supplementary Figure S2</a>).</div></section><section id='sec3dot2-vaccines-12-01294' type=''><h4 class='html-italic' data-nested='2'> 3.2. Identification of Additional Myeloid Cell Populations</h4><div class='html-p'>In addition to facilitating a comprehensive phenotypic analysis of pDCs and cDCs, the proposed staining panel also enables the identification of other myeloid cell populations in the mouse spleen, including macrophages and monocytes (<a href="#vaccines-12-01294-t001" class="html-table">Table 1</a>). Macrophages present a challenge in distinguishing them from DC populations due to potential contamination and overlapping marker expression. The macrophage marker F4/80 alone may not be sufficient for accurate identification, as certain cDC2 subsets also express this marker [<a href="#B37-vaccines-12-01294" class="html-bibr">37</a>,<a href="#B38-vaccines-12-01294" class="html-bibr">38</a>,<a href="#B39-vaccines-12-01294" class="html-bibr">39</a>,<a href="#B40-vaccines-12-01294" class="html-bibr">40</a>]. To overcome this issue, CD64, which is highly expressed on macrophages, should be used in combination with F4/80 to allow precise discrimination between macrophages and cDCs (<a href="#vaccines-12-01294-f002" class="html-fig">Figure 2</a>B).</div><div class='html-p'>It is important to note that the described protocol for isolating DCs will yield only a minor population of macrophages, primarily consisting of F4/80<sup>+</sup>CD64<sup>+</sup> red pulp macrophages, because splenic macrophages are challenging to isolate. For a more in-depth analysis of splenic macrophage populations, such as marginal zone macrophages (MZMs) and marginal metallophilic macrophages (MMMs), we highly recommend isolating spleen cells using Liberase TL digestion in the presence of lidocaine hydrochloride monohydrate (4 mg/mL) and DNase-1 (50 μg/mL) [<a href="#B41-vaccines-12-01294" class="html-bibr">41</a>]. MZMs and MMMs can be identified using antibodies against SIGN-R1 and CD169 (Siglec-1), respectively, as well as by their high side scatter and high autofluorescence (<a href="#vaccines-12-01294-t003" class="html-table">Table 3</a>) [<a href="#B41-vaccines-12-01294" class="html-bibr">41</a>,<a href="#B42-vaccines-12-01294" class="html-bibr">42</a>].</div><div class='html-p'>Monocytes express high levels of CX3CR1 and CD11b (<a href="#vaccines-12-01294-f002" class="html-fig">Figure 2</a>I) and can be further divided into Ly6C<sup>−</sup> and Ly6C<sup>+</sup> monocytes [<a href="#B43-vaccines-12-01294" class="html-bibr">43</a>,<a href="#B44-vaccines-12-01294" class="html-bibr">44</a>] (<a href="#vaccines-12-01294-f002" class="html-fig">Figure 2</a>J). Classical inflammatory Ly6C<sup>+</sup> monocytes selectively migrate to infection sites, where they participate in pathogen clearance, the removal of lipids and dying cells, as well as the production of inflammatory cytokines, and contribute to local and systemic inflammation. In contrast, Ly6C<sup>−</sup> monocytes patrol the vasculature at steady state to monitor for pathogenic infections [<a href="#B45-vaccines-12-01294" class="html-bibr">45</a>,<a href="#B46-vaccines-12-01294" class="html-bibr">46</a>,<a href="#B47-vaccines-12-01294" class="html-bibr">47</a>]. The molecular mechanisms underlying monocyte subset differentiation, however, remain unclear, and their functional features have not been systematically investigated.</div><div class='html-p'>Under (pathogenic) inflammation, monocytes can differentiate into MoDCs, which are heterogenous in phenotype and function. MoDCs are characterized by the expression of CD11c, MHC-II, and monocyte/macrophage-associated markers, including CD64 and Ly6C, while lacking CD26 [<a href="#B15-vaccines-12-01294" class="html-bibr">15</a>,<a href="#B48-vaccines-12-01294" class="html-bibr">48</a>]. Consequently, MoDCs can exhibit overlapping phenotypes with certain ESAM<sup>−</sup> cDC2 subsets (<a href="#vaccines-12-01294-f003" class="html-fig">Figure 3</a>), posing challenges for their differential classification, particularly during inflammation [<a href="#B8-vaccines-12-01294" class="html-bibr">8</a>,<a href="#B13-vaccines-12-01294" class="html-bibr">13</a>,<a href="#B14-vaccines-12-01294" class="html-bibr">14</a>,<a href="#B15-vaccines-12-01294" class="html-bibr">15</a>,<a href="#B19-vaccines-12-01294" class="html-bibr">19</a>]. Although certain DC subpopulations, likely in mucosal and other peripheral tissues like the skin, may originate from monocytes even during steady-state conditions [<a href="#B8-vaccines-12-01294" class="html-bibr">8</a>,<a href="#B37-vaccines-12-01294" class="html-bibr">37</a>,<a href="#B49-vaccines-12-01294" class="html-bibr">49</a>,<a href="#B50-vaccines-12-01294" class="html-bibr">50</a>,<a href="#B51-vaccines-12-01294" class="html-bibr">51</a>], the exact contribution of MoDCs to the splenic DC compartment remains unclear [<a href="#B52-vaccines-12-01294" class="html-bibr">52</a>]. Using our multicolor FACS panel, no CD11b<sup>+</sup>Ly6C<sup>+</sup>CD64<sup>+</sup> MoDCs [<a href="#B48-vaccines-12-01294" class="html-bibr">48</a>] could be detected in the steady-state spleen (<a href="#vaccines-12-01294-f004" class="html-fig">Figure 4</a>A). Another DC subset that emerges under certain inflammatory conditions are inflammatory cDC2s (Inf-cDC2s) [<a href="#B15-vaccines-12-01294" class="html-bibr">15</a>]. This bona fide cDC2 subpopulation can be characterized by the MAR-01 antibody (anti-FcεR1a), identifying them as CD26<sup>+</sup>SIRPα<sup>+</sup>CD64<sup>+</sup>MAR-01<sup>+</sup> cells within the CD11c<sup>+</sup>MHC-II<sup>+</sup> DC population. Under steady-state conditions, Inf-cDC2s are absent in the murine spleen (<a href="#vaccines-12-01294-f004" class="html-fig">Figure 4</a>B), and further studies are required to determine whether Inf-cDC2s occur outside the lung during inflammation.</div></section></section><section id='sec4-vaccines-12-01294' type='discussion'><h2 data-nested='1'> 4. Discussion</h2><div class='html-p'>The murine spleen harbors heterogeneous DC populations characterized by diverse developmental pathways, phenotypes, and immune-regulatory functions. The flow cytometric analysis of these DCs poses challenges due to the overlapping expression of several surface markers among various myeloid cell populations. Consequently, the accurate identification of individual DC subsets using a limited set of just a handful of markers is almost impossible. This study presents a novel staining panel optimized for the phenotypic characterization of steady-state cDC subpopulations in the mouse spleen, allowing for the unambiguous identification of multiple distinct DC and other myeloid cell populations (<a href="#vaccines-12-01294-f005" class="html-fig">Figure 5</a>).</div><div class='html-p'>This manuscript highlights the distinct roles and markers of various DC subsets, such as cDC1s and cDC2s. Understanding the unique functions of these subsets can inform the design of targeted vaccines that optimize antigen presentation and stimulate specific immune responses. For instance, in mice Langerin<sup>+</sup> cDC1 cells are known to be highly effective at cross-presenting antigens to CD8<sup>+</sup> T cells, making them a strategic target for vaccines aimed at inducing strong cytotoxic T cell responses.</div><div class='html-p'>Langerin<sup>+</sup>CD103<sup>+</sup> cDC1s play pivotal roles in the uptake of apoptotic/dying cells and are therefore essential to priming and shaping CD8<sup>+</sup> T cell responses [<a href="#B30-vaccines-12-01294" class="html-bibr">30</a>,<a href="#B31-vaccines-12-01294" class="html-bibr">31</a>,<a href="#B32-vaccines-12-01294" class="html-bibr">32</a>]. These cells are involved in the initiation of immunity towards blood-borne pathogens such as viruses, while also contributing significantly to the maintenance of tolerance towards cell-associated self-antigens [<a href="#B29-vaccines-12-01294" class="html-bibr">29</a>,<a href="#B33-vaccines-12-01294" class="html-bibr">33</a>,<a href="#B53-vaccines-12-01294" class="html-bibr">53</a>]. Understanding the ontogeny and differentiation pathways of Langerin<sup>+</sup> cDC1s, as well as the identification of the human counterpart, is paramount for harnessing their therapeutic potential. However, it is important to note that Langerin expression in these cells occurs primarily intracellularly. Therefore, Langerin might not be a suitable marker for functional experiments due to the requirement of fixing cells with paraformaldehyde. In contrast, CD103, which is co-expressed at high levels with Langerin on cDC1s, could serve as a more feasible marker for functional studies.</div><div class='html-p'>Our multiparameter staining panel also underscores the heterogeneity within the cDC2 population, where several subpopulations exhibit an overlapping marker expression with MoDCs and macrophages. This overlap poses challenges, as certain cDC2 subsets, such as ESAM<sup>−</sup>CX3CR1<sup>+</sup> cDC2Bs, which appear in the mouse spleen upon defective cDC2 homeostasis [<a href="#B13-vaccines-12-01294" class="html-bibr">13</a>,<a href="#B14-vaccines-12-01294" class="html-bibr">14</a>,<a href="#B19-vaccines-12-01294" class="html-bibr">19</a>], as well as inflammatory cDC2s [<a href="#B54-vaccines-12-01294" class="html-bibr">54</a>], are sometimes misidentified as being of monocytic origin. Currently, there is no optimal strategy for effectively separating these cDC2s from MoDCs [<a href="#B8-vaccines-12-01294" class="html-bibr">8</a>]. However, the proposed combination of CD26, CD64, Ly6C, and CD64 markers offers a feasible approach to enhance the discrimination and further characterization of these cells, thereby increasing our understanding of their unique immune functions. This advancement is particularly significant given the pivotal role of both cDCs and MoDCs in the development of novel immunotherapies and vaccination strategies, notably in cancer treatment. While the suggested staining panel improves the discrimination between overlapping cDC2 and MoDC phenotypes, its suitability during inflammatory conditions requires further investigation. Determining whether this panel satisfactorily distinguishes these cell types under inflammatory settings is crucial for its broader applicability.</div><div class='html-p'>Although we primarily validated this staining panel for steady-state spleen DCs, it is important to note that the staining panel may also be applicable for analyzing the conserved DC network across various tissues, including LN and peripheral tissues such as the lung and intestine. Additionally, while this panel could be potentially used to analyze the DC compartment under inflammatory conditions, it is worth mentioning that these specific conditions might necessitate certain modifications, as we have not yet validated the panel for such scenarios. Furthermore, the staining protocol offers flexibility for customization, for example, to assess the expression of co-stimulatory or inhibitory molecules or to adapt to flow cytometers with fewer channels by selectively replacing or removing certain non-DC core markers.</div><div class='html-p'>Comparing murine and human DC populations presents challenges, as many phenotypic markers used to distinguish the different murine DC subsets are not applicable to human DCs [<a href="#B55-vaccines-12-01294" class="html-bibr">55</a>]. Nevertheless, the human DC network can also be divided into distinct cDC1 and cDC2 subpopulations with unique phenotypic and functional characteristics. In humans, cDC1s are characterized by the expression of CD141 (BDCA3), Clec9a, and XCR1, while human cDC2s are identified by CD1c (BDCA1) expression. Similarly to mice, these cDC2s can be divided into at least two functionally distinct subsets, cDC2As and cDC2Bs [<a href="#B12-vaccines-12-01294" class="html-bibr">12</a>,<a href="#B56-vaccines-12-01294" class="html-bibr">56</a>,<a href="#B57-vaccines-12-01294" class="html-bibr">57</a>]. Notably, human CD141<sup>+</sup> cDC1s lack Langerin expression, which instead appears at low levels in a CD1a<sup>+</sup> cDC subset that is closely related to CD1c<sup>+</sup> cDC2s [<a href="#B58-vaccines-12-01294" class="html-bibr">58</a>,<a href="#B59-vaccines-12-01294" class="html-bibr">59</a>,<a href="#B60-vaccines-12-01294" class="html-bibr">60</a>,<a href="#B61-vaccines-12-01294" class="html-bibr">61</a>]. Human MoDCs are typically generated from peripheral blood monocytes in vitro. These include both CD14<sup>+</sup>CD16<sup>−</sup> monocytes, the predominant monocyte population, and CD14<sup>+</sup>CD16<sup>+</sup> monocytes that closely resemble Ly6<sup>hi</sup>CX3CR1<sup>lo</sup> classical monocytes in mice. In humans, both monocyte populations can differentiate into MoDCs and acquire DC characteristics, at least during in vitro culture with GM-CSF [<a href="#B62-vaccines-12-01294" class="html-bibr">62</a>,<a href="#B63-vaccines-12-01294" class="html-bibr">63</a>]. The differences between mouse and human DC biology underscore the necessity of careful consideration when extrapolating data from animal models to humans. Vaccine development requires human-specific studies to accurately predict vaccine efficacy and immune reactivity.</div><div class='html-p'>Finally, for the successful characterization of splenic DCs and other myeloid cell populations, several technical aspects should be taken into careful consideration. Fixation and permeabilization steps, essential for the detection of intracellular antigens, may alter the light scatter properties of cells and increase non-specific background staining. The addition of blocking proteins, such as bovine serum albumin (BSA) or fetal calf serum (FCS), to the staining buffer can reduce this non-specific background. Moreover, the use of Fixable Viability Dyes (FVDs) is recommended to exclude dead cells from the analysis. Notably, certain antigens may be susceptible to epitope masking by paraformaldehyde (PFA) fixation and, therefore, cannot be effectively stained after fixation [<a href="#B64-vaccines-12-01294" class="html-bibr">64</a>]. While the FACS buffer can be used for preparing the first Antibody Master Mix, we highly recommend using the specialized Brilliant Stain Buffer as described to prevent non-specific reactivity between the polymer-based fluorochromes, which may lead to data under-compensation. Given the calcium-dependent binding of 33D1 (anti-DCIR2), which allows for further cDC2 discrimination, EDTA should be omitted from the FACS buffer when including this antibody in the staining protocol [<a href="#B20-vaccines-12-01294" class="html-bibr">20</a>,<a href="#B21-vaccines-12-01294" class="html-bibr">21</a>].</div><div class='html-p'>In conclusion, our optimized staining panel, along with its potential future refinements, constitutes a valuable resource for researchers interested in investigating the complex dynamics of the DC network in both health and disease states.</div></section><section id='sec5-vaccines-12-01294' type='conclusions'><h2 data-nested='1'> 5. Conclusions</h2><div class='html-p'>Given the highly heterogenous nature of DC populations, several important lessons for vaccine development have emerged. First, a comprehensive phenotypic characterization of the different DC populations is crucial to understanding their specific immunomodulatory functions and developmental relationships. This manuscript provides a detailed step-by-step protocol for the multicolor analysis of murine cDC1s, cDC2s, and MoDCs. Second, because inflammation significantly influences DC functions and development, it is essential to consider the impact of the local immune environment when designing vaccines for use in inflammatory or infectious settings, as this can affect DC activation and the overall immune response. Finally, vaccine development must continue to incorporate emerging new findings in DC biology to refine and improve vaccine efficacy.</div></section> </div> <div class="html-back"> <section><section id='app1-vaccines-12-01294' type=''><h2 data-nested='1'> Supplementary Materials</h2><div class='html-p'>The following supporting information can be downloaded at: <a href='https://www.mdpi.com/article/10.3390/vaccines12111294/s1' target='_blank' rel="noopener noreferrer">https://www.mdpi.com/article/10.3390/vaccines12111294/s1</a>, Supplementary Materials: Preparation of required buffers; Figure S1: Gating for CD24+ cDC and CD64+ macrophages among LinnegMHC-II+ cells; Figure S2: Phenotypic characterization of resident and migratory cDC1 and cDC2 in skin-draining LN; Table S1: Cell surface antibody staining mix for flow cytometry; Table S2: Intracellular antibody staining mix for flow cytometry.</div></section></section><section class='html-notes'><h2 >Author Contributions</h2><div class='html-p'>Conceptualization, R.A.B.; Methodology, R.A.B. and H.C.P.; Software, R.A.B.; Validation, R.A.B. and H.C.P.; Formal analysis, R.A.B.; Investigation, R.A.B., H.C.P. and B.E.C.; Recourses, R.A.B., H.C.P. and B.E.C.; Data curation, R.A.B., H.C.P. and B.E.C.; Writing—original draft preparation, R.A.B.; Writing—review and editing, R.A.B., H.C.P. and B.E.C.; Visualization, R.A.B. and B.E.C., Supervision, R.A.B., H.C.P. and B.E.C., Project administration, R.A.B., H.C.P. and B.E.C.; Funding acquisition, R.A.B., H.C.P. and B.E.C. All authors have read and agreed to the published version of the manuscript.</div></section><section class='html-notes'><h2>Funding</h2><div class='html-p'>This work was supported by funding from the German Research Foundation (Deutsche Forschungsgemeinschaft, DFG) to R.A.B. (BA5939/2-1), H.C.P. (TR156-B02, CRC1292/2-TP13), and B.E.C. (CL419/2-2 [Project Nr. 315501751], CL419/4-1, CL419/7-1 [Project Nr. 503972215], CRC1292/2-TP20 [Project Nr. 318346496], and TRR355/1-A09 [Project Nr. 490846870]).</div></section><section id='html-ack' class='html-ack'><h2 >Acknowledgments</h2><div class='html-p'>The authors would like to thank the former and present members of their laboratories for the discussion and their invaluable contributions to the development of this step-by-step best practice protocol.</div></section><section class='html-notes'><h2 >Conflicts of Interest</h2><div class='html-p'>The authors declare that there are no commercial or financial conflicts of interest.</div></section><section id='html-references_list'><h2>References</h2><ol class='html-xx'><li id='B1-vaccines-12-01294' class='html-x' data-content='1.'>Amon, L.; Lehmann, C.H.; Baranska, A.; Schoen, J.; Heger, L.; Dudziak, D. Transcriptional control of dendritic cell development and functions. <span class='html-italic'>Int. Rev. Cell Mol. 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(<b>A</b>) Unbiased dimensionality reduction analysis via t-stochastic neighborhood embedding (t-SNE) of all living CD45<sup>+</sup> splenocytes categorizes the major distinct lymphocyte populations (CD4<sup>+</sup> and CD8<sup>+</sup> T cells, B cells), myeloid cell populations (monocytes, macrophages), and DC populations (cDC1s, cDC2s, pDCs). (<b>B</b>) Mapping of XCR1<sup>+</sup> cDC1s and SIRPα<sup>+</sup> cDC2s demonstrates a clear separation of the two main cDC populations in the spleen and illustrates the heterogeneity within each population. Data acquisition was performed using a BD FACSymphony flow cytometer, and data were evaluated using FlowJo software. For t-SNE, CD11c<sup>+</sup>MHC-II<sup>+</sup> cDCs of three wild-type mice were concatenated in FLowJo with 4.000 events per sample. All markers shown in <a href="#vaccines-12-01294-t001" class="html-table">Table 1</a>, as well as FSC-A and SSC-A, were utilized.  </div> </div> <div class="html-fig_show mfp-hide" id="fig_body_display_vaccines-12-01294-f001"> <div class="html-caption"> <b>Figure 1.</b> Identification of the major leukocyte and cDC populations in the steady-state murine spleen using a conserved 26-color core-marker FACS panel. (<b>A</b>) Unbiased dimensionality reduction analysis via t-stochastic neighborhood embedding (t-SNE) of all living CD45<sup>+</sup> splenocytes categorizes the major distinct lymphocyte populations (CD4<sup>+</sup> and CD8<sup>+</sup> T cells, B cells), myeloid cell populations (monocytes, macrophages), and DC populations (cDC1s, cDC2s, pDCs). (<b>B</b>) Mapping of XCR1<sup>+</sup> cDC1s and SIRPα<sup>+</sup> cDC2s demonstrates a clear separation of the two main cDC populations in the spleen and illustrates the heterogeneity within each population. Data acquisition was performed using a BD FACSymphony flow cytometer, and data were evaluated using FlowJo software. For t-SNE, CD11c<sup>+</sup>MHC-II<sup>+</sup> cDCs of three wild-type mice were concatenated in FLowJo with 4.000 events per sample. All markers shown in <a href="#vaccines-12-01294-t001" class="html-table">Table 1</a>, as well as FSC-A and SSC-A, were utilized.</div> <div class="html-img"><img data-large="/vaccines/vaccines-12-01294/article_deploy/html/images/vaccines-12-01294-g001.png" data-original="/vaccines/vaccines-12-01294/article_deploy/html/images/vaccines-12-01294-g001.png" alt="Vaccines 12 01294 g001" data-lsrc="/vaccines/vaccines-12-01294/article_deploy/html/images/vaccines-12-01294-g001.png" /></div> </div> <div class="html-fig-wrap" id="vaccines-12-01294-f003"> <div class='html-fig_img'> <div class="html-figpopup html-figpopup-link" data-counterslinkmanual = "https://www.mdpi.com/2076-393X/12/11/1294/display" href="#fig_body_display_vaccines-12-01294-f003"> <img data-large="/vaccines/vaccines-12-01294/article_deploy/html/images/vaccines-12-01294-g003.png" data-original="/vaccines/vaccines-12-01294/article_deploy/html/images/vaccines-12-01294-g003.png" alt="Vaccines 12 01294 g003" data-lsrc="/vaccines/vaccines-12-01294/article_deploy/html/images/vaccines-12-01294-g003-550.jpg" /> <a class="html-expand html-figpopup" data-counterslinkmanual = "https://www.mdpi.com/2076-393X/12/11/1294/display" href="#fig_body_display_vaccines-12-01294-f003"></a> </div> </div> <div class="html-fig_description"> <b>Figure 3.</b> <b>Phenotypic characterization of cDC1 and cDC2 subpopulations in the murine spleen.</b> (<b>A</b>) Expression of cDC1 markers CD24, CD26, CD103, CD205, and MHC-II on either Langerin<sup>+</sup> (filled, light blue) or Langerin<sup>−</sup> (dark blue lines) cDC1s. (<b>B</b>) Expression of cDC2 markers CD4, CD11b, CD26, CX3CR1, Ly6C, and MHC-II on either ESAM<sup>+</sup> (dark green lines) or ESAM<sup>−</sup> (filled, light green) cDC2s. Single-cell suspensions from the spleen were prepared as described in <a href="#sec2dot2-vaccines-12-01294" class="html-sec">Section 2.2</a> and stained as described in <a href="#vaccines-12-01294-f001" class="html-fig">Figure 1</a> and <a href="#vaccines-12-01294-f002" class="html-fig">Figure 2</a>. Isotype-matched control antibody stainings are indicated with gray lines in the histogram plots. Data acquisition was performed using a BD FACSymphony flow cytometer, and data analysis was carried out using FlowJo software.  </div> </div> <div class="html-fig_show mfp-hide" id="fig_body_display_vaccines-12-01294-f003"> <div class="html-caption"> <b>Figure 3.</b> <b>Phenotypic characterization of cDC1 and cDC2 subpopulations in the murine spleen.</b> (<b>A</b>) Expression of cDC1 markers CD24, CD26, CD103, CD205, and MHC-II on either Langerin<sup>+</sup> (filled, light blue) or Langerin<sup>−</sup> (dark blue lines) cDC1s. (<b>B</b>) Expression of cDC2 markers CD4, CD11b, CD26, CX3CR1, Ly6C, and MHC-II on either ESAM<sup>+</sup> (dark green lines) or ESAM<sup>−</sup> (filled, light green) cDC2s. Single-cell suspensions from the spleen were prepared as described in <a href="#sec2dot2-vaccines-12-01294" class="html-sec">Section 2.2</a> and stained as described in <a href="#vaccines-12-01294-f001" class="html-fig">Figure 1</a> and <a href="#vaccines-12-01294-f002" class="html-fig">Figure 2</a>. Isotype-matched control antibody stainings are indicated with gray lines in the histogram plots. Data acquisition was performed using a BD FACSymphony flow cytometer, and data analysis was carried out using FlowJo software.</div> <div class="html-img"><img data-large="/vaccines/vaccines-12-01294/article_deploy/html/images/vaccines-12-01294-g003.png" data-original="/vaccines/vaccines-12-01294/article_deploy/html/images/vaccines-12-01294-g003.png" alt="Vaccines 12 01294 g003" data-lsrc="/vaccines/vaccines-12-01294/article_deploy/html/images/vaccines-12-01294-g003.png" /></div> </div> <div class="html-fig-wrap" id="vaccines-12-01294-f004"> <div class='html-fig_img'> <div class="html-figpopup html-figpopup-link" data-counterslinkmanual = "https://www.mdpi.com/2076-393X/12/11/1294/display" href="#fig_body_display_vaccines-12-01294-f004"> <img data-large="/vaccines/vaccines-12-01294/article_deploy/html/images/vaccines-12-01294-g004.png" data-original="/vaccines/vaccines-12-01294/article_deploy/html/images/vaccines-12-01294-g004.png" alt="Vaccines 12 01294 g004" data-lsrc="/vaccines/vaccines-12-01294/article_deploy/html/images/vaccines-12-01294-g004-550.jpg" /> <a class="html-expand html-figpopup" data-counterslinkmanual = "https://www.mdpi.com/2076-393X/12/11/1294/display" href="#fig_body_display_vaccines-12-01294-f004"></a> </div> </div> <div class="html-fig_description"> <b>Figure 4.</b> <b>Phenotypic characterization of MoDCs and Inf-cDC2s in the steady-state murine spleen.</b> Frequency of Ly6C<sup>+</sup>CD64<sup>+</sup> MoDCs (<b>A</b>) and MAR-01<sup>+</sup>CD64<sup>+</sup> Inf-cDC2s (<b>B</b>) in the murine spleen. DCs were pre-gated as CD11c<sup>hi</sup>MHCII<sup>+</sup> cells. The gating strategy is based on the expression of either Ly6C<sup>+</sup>CD64<sup>+</sup> or MAR-01<sup>+</sup>CD64<sup>+</sup> on macrophages (CD11c<sup>int</sup>MHCII<sup>+</sup> cells). The FACS plots show one representative mouse/group. Data acquisition was performed using a BD FACSymphony flow cytometer, and data analysis was performed using FlowJo software.  </div> </div> <div class="html-fig_show mfp-hide" id="fig_body_display_vaccines-12-01294-f004"> <div class="html-caption"> <b>Figure 4.</b> <b>Phenotypic characterization of MoDCs and Inf-cDC2s in the steady-state murine spleen.</b> Frequency of Ly6C<sup>+</sup>CD64<sup>+</sup> MoDCs (<b>A</b>) and MAR-01<sup>+</sup>CD64<sup>+</sup> Inf-cDC2s (<b>B</b>) in the murine spleen. DCs were pre-gated as CD11c<sup>hi</sup>MHCII<sup>+</sup> cells. The gating strategy is based on the expression of either Ly6C<sup>+</sup>CD64<sup>+</sup> or MAR-01<sup>+</sup>CD64<sup>+</sup> on macrophages (CD11c<sup>int</sup>MHCII<sup>+</sup> cells). The FACS plots show one representative mouse/group. Data acquisition was performed using a BD FACSymphony flow cytometer, and data analysis was performed using FlowJo software.</div> <div class="html-img"><img data-large="/vaccines/vaccines-12-01294/article_deploy/html/images/vaccines-12-01294-g004.png" data-original="/vaccines/vaccines-12-01294/article_deploy/html/images/vaccines-12-01294-g004.png" alt="Vaccines 12 01294 g004" data-lsrc="/vaccines/vaccines-12-01294/article_deploy/html/images/vaccines-12-01294-g004.png" /></div> </div> <div class="html-fig-wrap" id="vaccines-12-01294-f005"> <div class='html-fig_img'> <div class="html-figpopup html-figpopup-link" data-counterslinkmanual = "https://www.mdpi.com/2076-393X/12/11/1294/display" href="#fig_body_display_vaccines-12-01294-f005"> <img data-large="/vaccines/vaccines-12-01294/article_deploy/html/images/vaccines-12-01294-g005.png" data-original="/vaccines/vaccines-12-01294/article_deploy/html/images/vaccines-12-01294-g005.png" alt="Vaccines 12 01294 g005" data-lsrc="/vaccines/vaccines-12-01294/article_deploy/html/images/vaccines-12-01294-g005-550.jpg" /> <a class="html-expand html-figpopup" data-counterslinkmanual = "https://www.mdpi.com/2076-393X/12/11/1294/display" href="#fig_body_display_vaccines-12-01294-f005"></a> </div> </div> <div class="html-fig_description"> <b>Figure 5.</b> <b>Characterization of distinct DC populations.</b> This figure summarizes the differentiation pathways and defining markers of the various DC subsets. Conventional DCs (cDCs) differentiate into two main populations: cDC1s and cDC2s, originating from the common DC precursor-derived pre-DC1s and pre-DC2s, respectively. Monocyte-derived DCs (MoDCs) develop from Ly6C<sup>hi</sup> monocytes. In lymphoid organs, cDC1s are characterized by the expression of CD8α, CD24, and XCR1. Within the cDC1 population, a subset expressing CD103 and Langerin can be identified. The cDC2 population constitutes at least 2 distinct subpopulations: ESAM<sup>+</sup> cDC2As and Clec12a<sup>+</sup> cDC2Bs. The exact relationship between inflammatory cDC2s (Inf-cDC2s) and other DCs remains unclear. Key lineage-defining markers for each DC population are highlighted and identifiable through the outlined protocol.  </div> </div> <div class="html-fig_show mfp-hide" id="fig_body_display_vaccines-12-01294-f005"> <div class="html-caption"> <b>Figure 5.</b> <b>Characterization of distinct DC populations.</b> This figure summarizes the differentiation pathways and defining markers of the various DC subsets. Conventional DCs (cDCs) differentiate into two main populations: cDC1s and cDC2s, originating from the common DC precursor-derived pre-DC1s and pre-DC2s, respectively. Monocyte-derived DCs (MoDCs) develop from Ly6C<sup>hi</sup> monocytes. In lymphoid organs, cDC1s are characterized by the expression of CD8α, CD24, and XCR1. Within the cDC1 population, a subset expressing CD103 and Langerin can be identified. The cDC2 population constitutes at least 2 distinct subpopulations: ESAM<sup>+</sup> cDC2As and Clec12a<sup>+</sup> cDC2Bs. The exact relationship between inflammatory cDC2s (Inf-cDC2s) and other DCs remains unclear. Key lineage-defining markers for each DC population are highlighted and identifiable through the outlined protocol.</div> <div class="html-img"><img data-large="/vaccines/vaccines-12-01294/article_deploy/html/images/vaccines-12-01294-g005.png" data-original="/vaccines/vaccines-12-01294/article_deploy/html/images/vaccines-12-01294-g005.png" alt="Vaccines 12 01294 g005" data-lsrc="/vaccines/vaccines-12-01294/article_deploy/html/images/vaccines-12-01294-g005.png" /></div> </div> <div class="html-table-wrap" id="vaccines-12-01294-t001"> <div class="html-table_wrap_td"> <div class="html-tablepopup html-tablepopup-link" data-counterslinkmanual = "https://www.mdpi.com/2076-393X/12/11/1294/display" href='#table_body_display_vaccines-12-01294-t001'> <img data-lsrc="https://pub.mdpi-res.com/img/table.png" /> <a class="html-expand html-tablepopup" data-counterslinkmanual = "https://www.mdpi.com/2076-393X/12/11/1294/display" href="#table_body_display_vaccines-12-01294-t001"></a> </div> </div> <div class="html-table_wrap_discription"> <b>Table 1.</b> Reagents, antibodies, chemicals, and solutions. </div> </div> <div class="html-table_show mfp-hide " id="table_body_display_vaccines-12-01294-t001"> <div class="html-caption"><b>Table 1.</b> Reagents, antibodies, chemicals, and solutions.</div> <table > <thead ><tr ><th align='center' valign='middle' style='border-top:solid thin;border-bottom:solid thin;background:#BFBFBF' class='html-align-center' >Reagent: <br>Monoclonal Antibodies</th><th align='center' valign='middle' style='border-top:solid thin;border-bottom:solid thin;background:#BFBFBF' class='html-align-center' >Clone</th><th align='center' valign='middle' style='border-top:solid thin;border-bottom:solid thin;background:#BFBFBF' class='html-align-center' >Conjugate</th><th align='center' valign='middle' style='border-top:solid thin;border-bottom:solid thin;background:#BFBFBF' class='html-align-center' >Isotype</th><th align='center' valign='middle' style='border-top:solid thin;border-bottom:solid thin;background:#BFBFBF' class='html-align-center' >Manufacturer</th><th align='center' valign='middle' style='border-top:solid thin;border-bottom:solid thin;background:#BFBFBF' class='html-align-center' >Order Number</th></tr></thead><tbody ><tr ><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Anti-CD4</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >RM4-5</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >PE-eFluor 610</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Rat IgG2a, κ</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Thermo Fisher, Waltham, MA, USA</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >61-0042-82</td></tr><tr ><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Anti-CD8α</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >53-6.7</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >PE-Cy7</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Rat IgG2a, κ</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Biolegend, San Diego, CA, USA</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >100722</td></tr><tr ><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Anti-CD11b</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >M1/70</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >BV605</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Rat IgG2b, κ</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >BD Biosciences, Franklin Lakes, NJ, USA</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >563015</td></tr><tr ><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Anti-CD11c</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >N418</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >APC-R700</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Hamster IgG2</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >BD Biosciences</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >565872</td></tr><tr ><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Anti-CD19</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >6D5</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >PE-Cy5</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Rat IgG2a, κ</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Biolegend</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >115510</td></tr><tr ><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Anti-CD24</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >M1/69</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >FITC</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Rat IgG2a</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Biolegend</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >137006</td></tr><tr ><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Anti-CD26</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >H194-112</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >PerCP-Cy5.5</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Rat IgG2a, κ</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Thermo Fisher,</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >45-0261-82</td></tr><tr ><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Anti-CD45pan</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >30-F11</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >BUV805</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Rat IgG2b, κ</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >BD Biosciences</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >748370</td></tr><tr ><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Anti-CD49b</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >DX5</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >PE-Cy5</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Rat IgM, κ</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Thermo Fisher</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >15-5971-82</td></tr><tr ><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Anti-CD64</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >X54-5/7.1</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >PerCP-710</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Mouse IgG1, κ</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Thermo Fisher</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >46-0641-82</td></tr><tr ><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Anti-CD90.2</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >30-H12</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >PE-Cy5</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Rat IgG2b, κ</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Biolegend</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >105314</td></tr><tr ><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Anti-CD103</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >M290</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >BUV395</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Rat IgG2a, κ</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >BD Biosciences</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >740238</td></tr><tr ><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Anti-CD172a (anti-SIRPα)</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >P84</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >BUV563</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Rat IgG1, κ</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >BD Biosciences</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >741349</td></tr><tr ><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Anti-CD207 (anti-Langerin)</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >929F3.01</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >AF647</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Rat IgG2a</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Dendritics, Lyon, France</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >DDX0362A647</td></tr><tr ><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Anti-CD317 (anti-PDCA1)</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >927</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >BV711</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Rat IgG2b, κ</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >BD Biosciences</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >747604</td></tr><tr ><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Anti-CD369 (anti-Dectin-1)</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >RA3-6B2</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >BUV496</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Rat IgG2a, κ</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >BD Biosciences</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >612950</td></tr><tr ><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Anti-CD371 (anti-Clec12A)</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >1/06-5D3</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >BV421</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Rat IgG2a, κ</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >BD Biosciences</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >564795</td></tr><tr ><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Anti-CX3CR1</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Z8-50</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >BB790-P</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Rat IgG2a, κ</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >BD Biosciences</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Custom</td></tr><tr ><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Anti-ESAM</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >1G8/ESAM</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >PE</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Rat IgG2a, κ</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Biolegend</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >136203</td></tr><tr ><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Anti-F4/80</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >T45-2342</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >BUV737</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Rat IgG2a, κ</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >BD Biosciences</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >749283</td></tr><tr ><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Anti-FcεR1a</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >MAR-01</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >BUV615-P</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Hamster IgG</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >BD Biosciences</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >751770</td></tr><tr ><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Anti-I-A/I-E (anti-MHC-II)</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >M5/114.15.2</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >BV786</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Rat IgG2b, κ</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >BD Biosciences</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >742894</td></tr><tr ><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Anti-Ly6C</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >HK1.4</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >BV570</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Rat IgG2c, κ</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Biolegend</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >128030</td></tr><tr ><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Anti-Ly6G</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >1A8</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >BV750</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Rat IgG2a, κ</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >BD Biosciences</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >747072</td></tr><tr ><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Anti-MerTK</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >M1/69</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >BUV661</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Rat IgG2b, κ</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >BD Biosciences</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >750679</td></tr><tr ><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Anti-NK1.1</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >PK136</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >PE-Cy5</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Mouse IgG2a, κ</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Biolegend</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >108716</td></tr><tr ><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Anti-Siglec-F</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >E50-2440</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >BV480</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Rat IgG2a, κ</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >BD Biosciences</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >746668</td></tr><tr ><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Anti-XCR1</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >ZET</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >BV650</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Mouse IgG2b, κ</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Biolegend</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >148220</td></tr><tr ><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Anti-CD16/32<br>(Anti-FcyRIIB/III)</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >2.4G2</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Purified</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Rat IgG2a, λ</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Biolegend</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >101302</td></tr><tr ><td colspan='2' align='center' valign='middle' style='border-bottom:solid thin;background:#BFBFBF' class='html-align-center' ><b>Chemicals, enzymes, and solutions</b></td><td align='center' valign='middle' style='border-bottom:solid thin;background:#BFBFBF' class='html-align-center' > </td><td align='center' valign='middle' style='border-bottom:solid thin;background:#BFBFBF' class='html-align-center' > </td><td align='center' valign='middle' style='border-bottom:solid thin;background:#BFBFBF' class='html-align-center' > </td><td align='center' valign='middle' style='border-bottom:solid thin;background:#BFBFBF' class='html-align-center' > </td></tr><tr ><td colspan='2' align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Dulbecco’s Phosphate-Buffered Saline (PBS) without calcium and magnesium</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' > </td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' > </td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Sigma, St. Louis, MS, USA</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >D8537</td></tr><tr ><td colspan='2' align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >0.5 M Ethylenediaminetetraacetate (EDTA) solution</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' > </td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' > </td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Sigma</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >03690</td></tr><tr ><td colspan='2' align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Ethylenediaminetetraacetic acid disodium salt dihydrate</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' > </td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' > </td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Sigma</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >E5123-1KG</td></tr><tr ><td colspan='2' align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Sodium hydroxide ≥ 98%, p.a., ISO, in pellets</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' > </td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' > </td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Carl Roth, Karlsruhe, Germany</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >6771.1</td></tr><tr ><td colspan='2' align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Brilliant Stain Buffer Plus</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' > </td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' > </td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >BD Biosciences</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >566385</td></tr><tr ><td colspan='2' align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Fetal Bovine Serum (FBS)</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' > </td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' > </td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Thermo Fisher, Waltham, MA, USA</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >10270-106</td></tr><tr ><td colspan='2' align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Fixable Viability Stain (L/D)</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >FVS780</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' > </td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >BD Biosciences</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >565388</td></tr><tr ><td colspan='2' align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Collagenase Type IV</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' > </td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' > </td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Worthington, Lakewood, NJ, USA</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >LS0004186</td></tr><tr ><td colspan='2' align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Deoxyribonuclease I (DNaseI)</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' > </td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' > </td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Roche, Basel, Switzerland</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >11284932001</td></tr></tbody> </table> </div> <div class="html-table-wrap" id="vaccines-12-01294-t002"> <div class="html-table_wrap_td"> <div class="html-tablepopup html-tablepopup-link" data-counterslinkmanual = "https://www.mdpi.com/2076-393X/12/11/1294/display" href='#table_body_display_vaccines-12-01294-t002'> <img data-lsrc="https://pub.mdpi-res.com/img/table.png" /> <a class="html-expand html-tablepopup" data-counterslinkmanual = "https://www.mdpi.com/2076-393X/12/11/1294/display" href="#table_body_display_vaccines-12-01294-t002"></a> </div> </div> <div class="html-table_wrap_discription"> <b>Table 2.</b> Necessary equipment. </div> </div> <div class="html-table_show mfp-hide " id="table_body_display_vaccines-12-01294-t002"> <div class="html-caption"><b>Table 2.</b> Necessary equipment.</div> <table > <thead ><tr ><th align='center' valign='middle' style='border-top:solid thin;border-bottom:solid thin;background:#BFBFBF' class='html-align-center' >Equipment</th><th align='center' valign='middle' style='border-top:solid thin;border-bottom:solid thin;background:#BFBFBF' class='html-align-center' >Company</th><th align='center' valign='middle' style='border-top:solid thin;border-bottom:solid thin;background:#BFBFBF' class='html-align-center' >Purpose</th></tr></thead><tbody ><tr ><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Centrifuge “Z 446 K”</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Hermle LaborTechnik, Wehingen, Germany</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Centrifugation of 15- and 50 mL tubes, and U-bottom plates</td></tr><tr ><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >FACSymphony A5</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >BD Biosciences, San Diego, CA, USA</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Flow cytometric analysis of single-cell suspensions</td></tr><tr ><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >PipetMan (P10-P1000)</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Gilson, Middleton, WI, USA</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Pipetting</td></tr><tr ><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >PipetBoy</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Thermo Fisher, Waltham, MA, USA</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Pipetting</td></tr><tr ><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Neubauer chamber 0.100 mm; 0.0025 mm<sup>2</sup></td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Superior Marienfeld, Lauda Königshofen, Germany</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Cell counting</td></tr><tr ><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >96-well U-bottom plate<br>(cat# 163320)</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Thermo Fisher, Waltham, MA, USA</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Sample preparation for flow cytometry</td></tr><tr ><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >2 mL microcentrifuge tubes <br>(cat# 72.695.200)</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Sarstedt, Nümbrecht, Germany</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Preparation of Antibody Master Mixes</td></tr><tr ><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Pipette tips</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Brand, Wertheim, Germany</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Pipetting</td></tr><tr ><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >15 mL tubes (cat# 188271)</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Greiner, Kremsmünster, Austria</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Centrifugation of cell suspensions</td></tr><tr ><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >50 mL tubes (cat# 227261)</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Greiner bio-one, Kremsmünster, Austria</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Centrifugation of cell suspensions</td></tr><tr ><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Serological pipettes (1–25 mL)</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Gilson, Lewis Center, OH, USA</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Pipetting</td></tr><tr ><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >40 μm cell strainer <br>(cat# 352340)</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Falcon, London, UK</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Filtration of samples derived before FACS staining</td></tr><tr ><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >FACS tube (cat#352008)</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Sigma, St. Louis, MS, USA</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Regular FACS tubes for acquisition of single-cell suspensions derived from spleen at a flow cytometer</td></tr><tr ><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Small scissors (cat# 14060-10)</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >FST, Heidelberg, Germany</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Super fine scissors to cut spleen tissue in small parts</td></tr><tr ><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Curved forceps (cat# 11271-30)</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >FST, Heidelberg, Germany</td><td align='center' valign='middle' style='border-bottom:solid thin;background:#F2F2F2' class='html-align-center' >Specialized surgical forceps</td></tr></tbody> </table> </div> </section><section class='html-fn_group'><table><tr id=''><td></td><td><div class='html-p'><b>Disclaimer/Publisher’s Note:</b> The statements, opinions and data contained in all publications are solely those of the individual author(s) and contributor(s) and not of MDPI and/or the editor(s). 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Multiparameter Flow Cytometric Analysis of the Conventional and Monocyte-Derived DC Compartment in the Murine Spleen. <em>Vaccines</em> <b>2024</b>, <em>12</em>, 1294. https://doi.org/10.3390/vaccines12111294 </p> <div style="display: block"> <b>AMA Style</b><br> <p> Backer RA, Probst HC, Clausen BE. Multiparameter Flow Cytometric Analysis of the Conventional and Monocyte-Derived DC Compartment in the Murine Spleen. <em>Vaccines</em>. 2024; 12(11):1294. https://doi.org/10.3390/vaccines12111294 </p> <b>Chicago/Turabian Style</b><br> <p> Backer, Ronald A., Hans Christian Probst, and Björn E. Clausen. 2024. "Multiparameter Flow Cytometric Analysis of the Conventional and Monocyte-Derived DC Compartment in the Murine Spleen" <em>Vaccines</em> 12, no. 11: 1294. https://doi.org/10.3390/vaccines12111294 </p> <b>APA Style</b><br> <p> Backer, R. A., Probst, H. C., & Clausen, B. E. (2024). Multiparameter Flow Cytometric Analysis of the Conventional and Monocyte-Derived DC Compartment in the Murine Spleen. <em>Vaccines</em>, <em>12</em>(11), 1294. https://doi.org/10.3390/vaccines12111294 </p> </div> </div> <div class="info-box no-margin"> Note that from the first issue of 2016, this journal uses article numbers instead of page numbers. 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Multiparameter Flow Cytometric Analysis of the Conventional and Monocyte-Derived DC Compartment in the Murine Spleen. <em>Vaccines</em> <b>2024</b>, <em>12</em>, 1294. https://doi.org/10.3390/vaccines12111294 </p> <div style="display: block"> <b>AMA Style</b><br> <p> Backer RA, Probst HC, Clausen BE. Multiparameter Flow Cytometric Analysis of the Conventional and Monocyte-Derived DC Compartment in the Murine Spleen. <em>Vaccines</em>. 2024; 12(11):1294. https://doi.org/10.3390/vaccines12111294 </p> <b>Chicago/Turabian Style</b><br> <p> Backer, Ronald A., Hans Christian Probst, and Björn E. Clausen. 2024. "Multiparameter Flow Cytometric Analysis of the Conventional and Monocyte-Derived DC Compartment in the Murine Spleen" <em>Vaccines</em> 12, no. 11: 1294. https://doi.org/10.3390/vaccines12111294 </p> <b>APA Style</b><br> <p> Backer, R. A., Probst, H. C., & Clausen, B. E. (2024). Multiparameter Flow Cytometric Analysis of the Conventional and Monocyte-Derived DC Compartment in the Murine Spleen. <em>Vaccines</em>, <em>12</em>(11), 1294. https://doi.org/10.3390/vaccines12111294 </p> </div> </div> <div class="info-box no-margin"> Note that from the first issue of 2016, this journal uses article numbers instead of page numbers. 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