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The Role of LSD1 and LSD2 in Cancers of the Gastrointestinal System: An Update

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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?1739771134"> <meta name="title" content="The Role of LSD1 and LSD2 in Cancers of the Gastrointestinal System: An Update"> <meta name="description" content="Epigenetic mechanisms are known to play a key role in cancer progression. Specifically, histone methylation involves reversible post-translational modification of histones that govern chromatin structure remodelling, genomic imprinting, gene expression, DNA damage repair, and meiotic crossover recombination, among other chromatin-based activities. Demethylases are enzymes that catalyse the demethylation of their substrate using a flavin adenine dinucleotide-dependent amine oxidation process. Lysine-specific demethylase 1 (LSD1) and its homolog, lysine-specific demethylase 2 (LSD2), are overexpressed in a variety of human cancer types and, thus, regulate tumour progression. In this review, we focus on the literature from the last 5 years concerning the role of LSD1 and LSD2 in the main gastrointestinal cancers (i.e., gastric cancer, liver cancer, pancreatic cancer, and colorectal cancer)." > <link rel="image_src" href="https://pub.mdpi-res.com/img/journals/biomolecules-logo.png?8600e93ff98dbf14" > <meta name="dc.title" content="The Role of LSD1 and LSD2 in Cancers of the Gastrointestinal System: An Update"> <meta name="dc.creator" content="Gianluca Malagraba"> <meta name="dc.creator" content="Mahdieh Yarmohammadi"> <meta name="dc.creator" content="Aadil Javed"> <meta name="dc.creator" content="Carles Barceló"> <meta name="dc.creator" content="Teresa Rubio-Tomás"> <meta name="dc.type" content="Review"> <meta name="dc.source" content="Biomolecules 2022, Vol. 12, Page 462"> <meta name="dc.date" content="2022-03-17"> <meta name ="dc.identifier" content="10.3390/biom12030462"> <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="Epigenetic mechanisms are known to play a key role in cancer progression. Specifically, histone methylation involves reversible post-translational modification of histones that govern chromatin structure remodelling, genomic imprinting, gene expression, DNA damage repair, and meiotic crossover recombination, among other chromatin-based activities. Demethylases are enzymes that catalyse the demethylation of their substrate using a flavin adenine dinucleotide-dependent amine oxidation process. Lysine-specific demethylase 1 (LSD1) and its homolog, lysine-specific demethylase 2 (LSD2), are overexpressed in a variety of human cancer types and, thus, regulate tumour progression. In this review, we focus on the literature from the last 5 years concerning the role of LSD1 and LSD2 in the main gastrointestinal cancers (i.e., gastric cancer, liver cancer, pancreatic cancer, and colorectal cancer)." > <meta name="dc.subject" content="demethylation" > <meta name="dc.subject" content="LSD1" > <meta name="dc.subject" content="LSD2" > <meta name="dc.subject" content="gastric cancer" > <meta name="dc.subject" content="liver cancer" > <meta name="dc.subject" content="pancreatic cancer" > <meta name="dc.subject" content="colorectal cancer" > <meta name ="prism.issn" content="2218-273X"> <meta name ="prism.publicationName" content="Biomolecules"> <meta name ="prism.publicationDate" content="2022-03-17"> <meta name ="prism.volume" content="12"> <meta name ="prism.number" content="3"> <meta name ="prism.section" content="Review" > <meta name ="prism.startingPage" content="462" > <meta name="citation_issn" content="2218-273X"> <meta name="citation_journal_title" content="Biomolecules"> <meta name="citation_publisher" content="Multidisciplinary Digital Publishing Institute"> <meta name="citation_title" content="The Role of LSD1 and LSD2 in Cancers of the Gastrointestinal System: An Update"> <meta name="citation_publication_date" content="2022/3"> <meta name="citation_online_date" content="2022/03/17"> <meta name="citation_volume" content="12"> <meta name="citation_issue" content="3"> <meta name="citation_firstpage" content="462"> <meta name="citation_author" content="Malagraba, Gianluca"> <meta name="citation_author" content="Yarmohammadi, Mahdieh"> <meta name="citation_author" content="Javed, Aadil"> <meta name="citation_author" content="Barceló, Carles"> <meta name="citation_author" content="Rubio-Tomás, Teresa"> <meta name="citation_doi" content="10.3390/biom12030462"> <meta name="citation_id" content="mdpi-biom12030462"> <meta name="citation_abstract_html_url" content="https://www.mdpi.com/2218-273X/12/3/462"> <meta name="citation_pdf_url" content="https://www.mdpi.com/2218-273X/12/3/462/pdf?version=1647501826"> <link rel="alternate" type="application/pdf" title="PDF Full-Text" href="https://www.mdpi.com/2218-273X/12/3/462/pdf?version=1647501826"> <meta name="fulltext_pdf" content="https://www.mdpi.com/2218-273X/12/3/462/pdf?version=1647501826"> <meta name="citation_fulltext_html_url" content="https://www.mdpi.com/2218-273X/12/3/462/htm"> <link rel="alternate" type="text/html" title="HTML Full-Text" href="https://www.mdpi.com/2218-273X/12/3/462/htm"> <meta name="fulltext_html" content="https://www.mdpi.com/2218-273X/12/3/462/htm"> <link rel="alternate" type="text/xml" title="XML Full-Text" href="https://www.mdpi.com/2218-273X/12/3/462/xml"> <meta name="fulltext_xml" content="https://www.mdpi.com/2218-273X/12/3/462/xml"> <meta name="citation_xml_url" content="https://www.mdpi.com/2218-273X/12/3/462/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/biomolecules-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/2218-273X/12/3/462" /> <meta property="og:title" content="The Role of LSD1 and LSD2 in Cancers of the Gastrointestinal System: An Update" /> <meta property="og:description" content="Epigenetic mechanisms are known to play a key role in cancer progression. Specifically, histone methylation involves reversible post-translational modification of histones that govern chromatin structure remodelling, genomic imprinting, gene expression, DNA damage repair, and meiotic crossover recombination, among other chromatin-based activities. Demethylases are enzymes that catalyse the demethylation of their substrate using a flavin adenine dinucleotide-dependent amine oxidation process. Lysine-specific demethylase 1 (LSD1) and its homolog, lysine-specific demethylase 2 (LSD2), are overexpressed in a variety of human cancer types and, thus, regulate tumour progression. In this review, we focus on the literature from the last 5 years concerning the role of LSD1 and LSD2 in the main gastrointestinal cancers (i.e., gastric cancer, liver cancer, pancreatic cancer, and colorectal cancer)." /> <meta property="og:image" content="https://pub.mdpi-res.com/biomolecules/biomolecules-12-00462/article_deploy/html/images/biomolecules-12-00462-ag-550.jpg?1647501923" /> <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> <!--[if lt IE 9]> <script>var browserIe8 = true;</script> <link rel="stylesheet" href="https://pub.mdpi-res.com/assets/css/ie8foundationfix.css?50273beac949cbf0?1739771134"> <script src="//html5shiv.googlecode.com/svn/trunk/html5.js"></script> <script src="//cdnjs.cloudflare.com/ajax/libs/html5shiv/3.6.2/html5shiv.js"></script> <script src="//s3.amazonaws.com/nwapi/nwmatcher/nwmatcher-1.2.5-min.js"></script> <script src="//html5base.googlecode.com/svn-history/r38/trunk/js/selectivizr-1.0.3b.js"></script> <script src="//cdnjs.cloudflare.com/ajax/libs/respond.js/1.1.0/respond.min.js"></script> <script src="https://pub.mdpi-res.com/assets/js/ie8/ie8patch.js?9e1d3c689a0471df?1739771134"></script> <script src="https://pub.mdpi-res.com/assets/js/ie8/rem.min.js?94b62787dcd6d2f2?1739771134"></script> <![endif]--> <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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Gastrointestinal System: An Update </h1> <div class="art-authors hypothesis_container"> by <span class="inlineblock "><div class='profile-card-drop' data-dropdown='profile-card-drop7280976' data-options='is_hover:true, hover_timeout:5000'> Gianluca Malagraba</div><div id="profile-card-drop7280976" 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/2087340/thumb/Gianluca_Malagraba_Papadopoulos.jpg" style="width: auto; height: 16px; border-radius: 50%;"><span class="sciprofiles-link__name">Gianluca Malagraba</span></div></div></div><div class="profile-card__buttons" style="margin-bottom: 10px;"><a href="https://sciprofiles.com/profile/2087340?utm_source=mdpi.com&amp;utm_medium=website&amp;utm_campaign=avatar_name" class="button button--color-inversed" 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data-dropdown='profile-card-drop7280977' data-options='is_hover:true, hover_timeout:5000'> Mahdieh Yarmohammadi</div><div id="profile-card-drop7280977" 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">Mahdieh Yarmohammadi</span></div></div></div><div class="profile-card__buttons" style="margin-bottom: 10px;"><a href="https://sciprofiles.com/profile/author/T2N4Q3J5SXNacEtOQkxUWCtVQnB3ZGVPVjB6MUlKODN5Y0F5YitzaVVJRT0=?utm_source=mdpi.com&amp;utm_medium=website&amp;utm_campaign=avatar_name" class="button button--color-inversed" target="_blank"> SciProfiles </a><a href="https://scilit.com/scholars?q=Mahdieh%20Yarmohammadi" 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Javed</div><div id="profile-card-drop7280978" 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/2038026/thumb/Aadil_Javed.jpg" style="width: auto; height: 16px; border-radius: 50%;"><span class="sciprofiles-link__name">Aadil Javed</span></div></div></div><div class="profile-card__buttons" style="margin-bottom: 10px;"><a href="https://sciprofiles.com/profile/2038026?utm_source=mdpi.com&amp;utm_medium=website&amp;utm_campaign=avatar_name" class="button button--color-inversed" target="_blank"> SciProfiles </a><a href="https://scilit.com/scholars?q=Aadil%20Javed" class="button button--color-inversed" target="_blank"> Scilit </a><a href="https://www.preprints.org/search?search1=Aadil%20Javed&field1=authors" class="button button--color-inversed" target="_blank"> 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data-options='is_hover:true, hover_timeout:5000'> Carles Barceló</div><div id="profile-card-drop7280979" 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">Carles Barceló</span></div></div></div><div class="profile-card__buttons" style="margin-bottom: 10px;"><a href="https://sciprofiles.com/profile/1805797?utm_source=mdpi.com&amp;utm_medium=website&amp;utm_campaign=avatar_name" class="button button--color-inversed" target="_blank"> SciProfiles </a><a href="https://scilit.com/scholars?q=Carles%20Barcel%C3%B3" class="button button--color-inversed" target="_blank"> Scilit </a><a 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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 ">Translational Pancreatic Cancer Oncogenesis Group, Health Research Institute of the Balearic Islands (IdISBA), 07120 Palma de Mallorca, Spain</div> </div> <div class="affiliation "> <div class="affiliation-item"><sup>2</sup></div> <div class="affiliation-name ">Central Tehran Branch, Department of Biology, Faculty of Sciences, Islamic Azad University, Tehran 1955847881, Iran</div> </div> <div class="affiliation "> <div class="affiliation-item"><sup>3</sup></div> <div class="affiliation-name ">Cancer Biology Laboratory, Department of Bioengineering, Faculty of Engineering, Ege University, Izmir 35040, Turkey</div> </div> <div class="affiliation "> <div class="affiliation-item"><sup>4</sup></div> <div class="affiliation-name ">Institut d’Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), 08036 Barcelona, Spain</div> </div> <div class="affiliation "> <div class="affiliation-item"><sup>5</sup></div> <div class="affiliation-name ">School of Medicine, University of Crete, 70013 Herakleion, Crete, Greece</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 class="affiliation"> <div class="affiliation-item"><sup>†</sup></div> <div class="affiliation-name ">These authors contributed equally to this work.</div> </div> </div> </div> <div class="bib-identity" style="margin-bottom: 10px;"> <em>Biomolecules</em> <b>2022</b>, <em>12</em>(3), 462; <a href="https://doi.org/10.3390/biom12030462">https://doi.org/10.3390/biom12030462</a> </div> <div class="pubhistory" style="font-weight: bold; padding-bottom: 10px;"> <span style="display: inline-block">Submission received: 21 February 2022</span> / <span style="display: inline-block">Revised: 11 March 2022</span> / <span style="display: inline-block">Accepted: 15 March 2022</span> / <span style="display: inline-block">Published: 17 March 2022</span> </div> <div class="belongsTo" style="margin-bottom: 10px;"> (This article belongs to the Special Issue <a href=" /journal/biomolecules/special_issues/Jumonji_Domain_Containing_Proteins ">Jumonji Domain-Containing Proteins in Cancer Progression</a>)<br/> </div> <div class="highlight-box1"> <div class="download"> <a class="button button--color-inversed button--drop-down" data-dropdown="drop-download-773044" aria-controls="drop-supplementary-773044" aria-expanded="false"> Download <i class="material-icons">keyboard_arrow_down</i> </a> <div id="drop-download-773044" class="f-dropdown label__btn__dropdown label__btn__dropdown--button" data-dropdown-content aria-hidden="true" tabindex="-1"> <a class="UD_ArticlePDF" href="/2218-273X/12/3/462/pdf?version=1647501826" data-name="The Role of LSD1 and LSD2 in Cancers of the Gastrointestinal System: An Update" data-journal="biomolecules">Download PDF</a> <br/> <a id="js-pdf-with-cover-access-captcha" href="#" data-target="/2218-273X/12/3/462/pdf-with-cover" class="accessCaptcha">Download PDF with Cover</a> <br/> <a id="js-xml-access-captcha" href="#" data-target="/2218-273X/12/3/462/xml" class="accessCaptcha">Download XML</a> <br/> <a href="/2218-273X/12/3/462/epub" id="epub_link">Download Epub</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/2218-273X/12/3/462/browse" >Browse Figures</a> </div> <div id="article-popup" class="popupgallery" style="display: inline; line-height: 200%"> <a href="https://pub.mdpi-res.com/biomolecules/biomolecules-12-00462/article_deploy/html/images/biomolecules-12-00462-ag.png?1647501923" title=" <strong>Graphical abstract</strong><br/> "> </a> <a href="https://pub.mdpi-res.com/biomolecules/biomolecules-12-00462/article_deploy/html/images/biomolecules-12-00462-g001.png?1647501923" title=" <strong>Figure 1</strong><br/> &lt;p&gt;LSD1 (&lt;b&gt;left&lt;/b&gt; panel) and LSD2 (&lt;b&gt;right&lt;/b&gt; panel) expression and its correlation with gastric cancer fate. The green colour represents upregulation while purple represents downregulation of different molecules, which are related to LSD1 and LSD2 upregulation, respectively.&lt;/p&gt; "> </a> <a href="https://pub.mdpi-res.com/biomolecules/biomolecules-12-00462/article_deploy/html/images/biomolecules-12-00462-g002.png?1647501923" title=" <strong>Figure 2</strong><br/> &lt;p&gt;LSD1 expression and its correlation with liver cancer fate. The green colour represents upregulation or increase while purple represents decrease, which are related to LSD1 upregulation.&lt;/p&gt; "> </a> <a href="https://pub.mdpi-res.com/biomolecules/biomolecules-12-00462/article_deploy/html/images/biomolecules-12-00462-g003.png?1647501923" title=" <strong>Figure 3</strong><br/> &lt;p&gt;LSD1 and LSD2 expression and its correlation with pancreatic cancer fate. The green colour represents upregulation of each specific molecule, which all together leads to increased pancreatic cancer cell proliferation and decreased apoptosis.&lt;/p&gt; "> </a> <a href="https://pub.mdpi-res.com/biomolecules/biomolecules-12-00462/article_deploy/html/images/biomolecules-12-00462-g004.png?1647501923" title=" <strong>Figure 4</strong><br/> &lt;p&gt;LSD1 (&lt;b&gt;left&lt;/b&gt; panel) and LSD2 (&lt;b&gt;right&lt;/b&gt; panel) expression and its correlation with colorectal cancer fate. The green colour represents upregulation while purple represents downregulationof each specific molecule, which are related to LSD1 and LSD2 upregulation, respectively.&lt;/p&gt; "> </a> </div> <a class="button button--color-inversed" href="/2218-273X/12/3/462/review_report">Review&nbsp;Reports</a> <a class="button button--color-inversed" href="/2218-273X/12/3/462/notes">Versions&nbsp;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">Epigenetic mechanisms are known to play a key role in cancer progression. Specifically, histone methylation involves reversible post-translational modification of histones that govern chromatin structure remodelling, genomic imprinting, gene expression, DNA damage repair, and meiotic crossover recombination, among other chromatin-based activities. Demethylases are enzymes that catalyse the demethylation of their substrate using a flavin adenine dinucleotide-dependent amine oxidation process. Lysine-specific demethylase 1 (LSD1) and its homolog, lysine-specific demethylase 2 (LSD2), are overexpressed in a variety of human cancer types and, thus, regulate tumour progression. In this review, we focus on the literature from the last 5 years concerning the role of LSD1 and LSD2 in the main gastrointestinal cancers (i.e., gastric cancer, liver cancer, pancreatic cancer, and colorectal cancer).</div> </section> <div id="html-keywords"> <div class="html-gwd-group"><div id="html-keywords-title">Keywords: </div><a href="/search?q=demethylation">demethylation</a>; <a href="/search?q=LSD1">LSD1</a>; <a href="/search?q=LSD2">LSD2</a>; <a href="/search?q=gastric+cancer">gastric cancer</a>; <a href="/search?q=liver+cancer">liver cancer</a>; <a href="/search?q=pancreatic+cancer">pancreatic cancer</a>; <a href="/search?q=colorectal+cancer">colorectal cancer</a></div> <div> </div> </div> </div> </p> </div> <div class="row"> <div class="columns large-12 text-center"> <div class="abstract-image-preview open js-browse-figures"> <a href="#" class="openpopupgallery" data-target='article-popup-ga'> <img src="https://pub.mdpi-res.com/biomolecules/biomolecules-12-00462/article_deploy/html/images/biomolecules-12-00462-ag-550.jpg?1647501923" style="max-width: 100%; max-height: 280px; padding: 10px;"> </a> <div id="article-popup-ga" class="popupgallery" style="display: inline; line-height: 200%"> <a href="https://pub.mdpi-res.com/biomolecules/biomolecules-12-00462/article_deploy/html/images/biomolecules-12-00462-ag.png?1647501923" title="<strong>Graphical Abstract</strong>"></a> </div> <div>Graphical Abstract</div> </div> </div> </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-biomolecules-12-00462' type='intro'><h2 data-nested='1'> 1. Introduction</h2><div class='html-p'>According to the World Health Organization (WHO), cancer is a group of diseases that can develop in almost any organ or tissue when a group of abnormal cells grows uncontrollably beyond its normal limits, and can then invade other tissues (metastasis). In 2020, there were more than 19 million new cancer cases and almost 10 million deaths due to cancer, making this disease the second cause of death worldwide. Furthermore, up to 30% of these deaths are due to gastrointestinal cancers [<a href="#B1-biomolecules-12-00462" class="html-bibr">1</a>,<a href="#B2-biomolecules-12-00462" class="html-bibr">2</a>].</div><div class='html-p'>Understanding the mechanisms of cancer is key to developing efficient and specific treatments. Acquisition of cancer hallmarks largely depends on alterations in the genomes of neoplastic cells, including genome mutations, as well as epigenetic mechanisms which affect gene expression [<a href="#B3-biomolecules-12-00462" class="html-bibr">3</a>,<a href="#B4-biomolecules-12-00462" class="html-bibr">4</a>].</div><div class='html-p'>Epigenetics is commonly defined as the study of heritable changes in gene expression or chromosomal stability by DNA methylation, histone covalent modification (methylation, acetylation, ubiquitination…), or non-coding RNAs without a change in DNA sequence. Epigenetics plays a central role in cancer by altering proto-oncogenes and tumour suppressor transcription [<a href="#B5-biomolecules-12-00462" class="html-bibr">5</a>]. For a long time, methylation marks in histones were thought to be irreversible until the discovery of histone demethylases [<a href="#B6-biomolecules-12-00462" class="html-bibr">6</a>]. There are two families of histone demethylases: the larger Jumonji domain family and the smaller flavin-dependent lysine-specific demethylase (LSD) family formed by lysine-specific demethylase 1 (LSD1) and lysine-specific demethylase 2 (LSD2) [<a href="#B7-biomolecules-12-00462" class="html-bibr">7</a>]. </div><div class='html-p'>LSD1 (also referred to as KDM1A/BHC110/AOF2) was the first human histone demethylase identified (2004). The LSD1 homolog, LSD2 (also referred to as KDM1B/AOF1), was identified the same year through a domain homology search of genomic databases and became the second human histone demethylase identified [<a href="#B6-biomolecules-12-00462" class="html-bibr">6</a>,<a href="#B7-biomolecules-12-00462" class="html-bibr">7</a>,<a href="#B8-biomolecules-12-00462" class="html-bibr">8</a>]. Both enzymes are characterized by the presence of an amine oxidase-like domain and a Swi3p, Rsc8p, and Moira (SWIRM) domain, which are unique to chromatin-associated proteins. Other than these two domains, LSD1 and LSD2 exhibit different structural architectures facilitating their association with different protein complexes and different genomic loci [<a href="#B7-biomolecules-12-00462" class="html-bibr">7</a>].</div><div class='html-p'>There are three structural domains present in LSD1 that are well conserved including the <span class='html-small-caps'>c</span>-terminal amino oxidase-like (AOL) domain, the SWI3/RSC8/MOIRA (SWIRM) domain, and the flexible <span class='html-small-caps'>n</span>-terminal region. The catalytic region of LSD1 resides on the AOL domain, which contains two lobes where one lobe connects with SWIRM, which further contains the follistatin domain (FSD)-binding site carrying oxidation, and the second lobe functions as a substrate recognition site. Therefore, the lobes form the catalytic centre displaying demethylation activity in the cavity. AOL domain also protrudes a Tower domain accompanying alpha-helices, which forms an interaction site with repressor element 1 (RE1) silencing transcription factor (REST) corepressor (CoREST) complex and is critical for H3K4 demethylase activity of LSD1. The extra-nucleosomal DNA can bind with the AOL domain along with the CoREST complex. The nuclear localization of LSD1 depends on the flexible <span class='html-small-caps'>n</span>-terminal region of LSD1, which is not responsible for its demethylase activity. LSD1 has a specialized SWIRM domain incapable of binding to DNA and acts as an interaction site of LSD1 with its interacting partners [<a href="#B6-biomolecules-12-00462" class="html-bibr">6</a>,<a href="#B7-biomolecules-12-00462" class="html-bibr">7</a>,<a href="#B8-biomolecules-12-00462" class="html-bibr">8</a>].</div><div class='html-p'>LSD2 also referred to as AOF1 and KDM1B is a homolog of LSD1 possessing FAD-dependent amino-oxidase activity with no specificity towards non-histone substrates and specifically demethylates H3K4me1/2 along with H3K9me2 in the regions of the promoter genes associated with NF-kB proteins. The protruding TOWER domain is absent in LSD2 and it displays both AOL and SWIRM domains. Both LSD1 and LSD1 are known to exhibit FAD-demethylation activity, however, these proteins have other functions in cells including gene enhancer, promoter-binding, transcriptional repression, and activation properties. LSD2 changes the methylation dynamics of key transcriptional proteins such as NSD3, Cyclin T1, and Poly II and is known to interact with these transcriptionally activated genes via their coding regions as it assists in the regulation of the elongation process of transcription [<a href="#B6-biomolecules-12-00462" class="html-bibr">6</a>,<a href="#B7-biomolecules-12-00462" class="html-bibr">7</a>,<a href="#B8-biomolecules-12-00462" class="html-bibr">8</a>,<a href="#B9-biomolecules-12-00462" class="html-bibr">9</a>].</div><div class='html-p'>LSD1 specifically demethylates mono- and di-methylated histone 3 lysine 4 (H3K4me1/2), a histone mark linked to active transcription, and mono- and di-methylated histone 3 lysine 9 (H3K9me1/2), a histone mark linked to inactive transcription. Moreover, LSD1 forms a stable complex with corepressor CoREST. Although LSD2 presents less than 25% of sequence identity with LSD1 it has specificity for H3K4me1/2, unlike LSD1, LSD2 is not able to form a stable complex with CoREST. LSD2 catalyses the demethylation of their substrate using a flavin adenine dinucleotide (FAD)-dependent amine oxidation process [<a href="#B9-biomolecules-12-00462" class="html-bibr">9</a>]. Although LSD2 is found in most tumour cells, including tumours of the gastrointestinal system [<a href="#B10-biomolecules-12-00462" class="html-bibr">10</a>], it may also protect healthy adult cells from becoming malignant [<a href="#B11-biomolecules-12-00462" class="html-bibr">11</a>,<a href="#B12-biomolecules-12-00462" class="html-bibr">12</a>]. By joining with the RNA polymerase II (Pol II) elongating complex and demethylating H3K4me2, a crucial marker for epigenetic transcriptional activation, LSD2 functions as a core-pressor, facilitating transcription elongation [<a href="#B13-biomolecules-12-00462" class="html-bibr">13</a>,<a href="#B14-biomolecules-12-00462" class="html-bibr">14</a>]. </div><div class='html-p'>Histone methylation is a reversible post-translational modification of histones that governs chromatin structure remodelling, genomic imprinting, gene expression, DNA damage repair, and meiotic crossover recombination, among other chromatin-based activities [<a href="#B15-biomolecules-12-00462" class="html-bibr">15</a>]. Thus, LSD2 may be involved in transcriptional programmes distinct from those of LSD1 [<a href="#B6-biomolecules-12-00462" class="html-bibr">6</a>]. Moreover, new noncatalytic LSD interactions have been highlighted as being relevant in cancer [<a href="#B8-biomolecules-12-00462" class="html-bibr">8</a>].</div><div class='html-p'>In addition, both LSD1 and LSD2 target non-histone proteins. For example, LSD1 demethylates the well-known tumour suppressor protein p53 [<a href="#B16-biomolecules-12-00462" class="html-bibr">16</a>], as well as myosin phosphatase target subunit 1 (MYPT1) [<a href="#B17-biomolecules-12-00462" class="html-bibr">17</a>] and SRY (sex determining region Y)-box 2 (SOX2) [<a href="#B18-biomolecules-12-00462" class="html-bibr">18</a>] and these activities are thought to promote tumour progression.</div><div class='html-p'>Indeed, LSD1 is highly expressed in many cancer types including breast, prostate, oesophageal, bladder and lung cancer, and neuroblastoma and acute myeloid leukaemia [<a href="#B7-biomolecules-12-00462" class="html-bibr">7</a>]. Understanding of the biological role of LSD2 is not as broad as that of LSD1. However, it is known that LSD2 plays a role in oncogenesis, although its mechanisms are less clear [<a href="#B6-biomolecules-12-00462" class="html-bibr">6</a>].</div><div class='html-p'>In this review, we summarise the latest findings regarding LSD1 and LSD2 in cancers of the gastrointestinal system: gastric cancer (GC), liver cancer, pancreatic cancer, and colorectal cancer (CRC). </div></section><section id='sec2-biomolecules-12-00462' type=''><h2 data-nested='1'> 2. Gastric Cancer</h2><div class='html-p'>GC is the fifth most common cancer diagnosed worldwide and the third leading cause of death by cancer. The overall survival has improved due to early cancer detection and improved standard-of-care cancer therapies, including tailored treatment based on tumour molecular biology [<a href="#B19-biomolecules-12-00462" class="html-bibr">19</a>,<a href="#B20-biomolecules-12-00462" class="html-bibr">20</a>]. </div><section id='sec2dot1-biomolecules-12-00462' type=''><h4 class='html-italic' data-nested='2'> 2.1. LSD1 in Gastric Cancer</h4><div class='html-p'>LSD1 has been shown to promote gastric cancer proliferation [<a href="#B21-biomolecules-12-00462" class="html-bibr">21</a>]. More importantly, overexpression of LSD1 is involved in many pathological processes of gastric cancer, such as proliferation, apoptosis, and metastasis of various GC cells [<a href="#B22-biomolecules-12-00462" class="html-bibr">22</a>].</div><div class='html-p'>Recently, a number of studies have highlighted the critical roles played by long noncoding RNAs (lncRNAs) in the pathogenesis of several types of human cancer, especially in GC [<a href="#B23-biomolecules-12-00462" class="html-bibr">23</a>]. More importantly, lncRNAs can directly bind to LSD1 and may function as a scaffold, thereby repressing underlying Krüppel-like factor 2 (KLF2) target and large tumor suppressor kinase 2 (LATS2) expression [<a href="#B24-biomolecules-12-00462" class="html-bibr">24</a>]. LSD1 and lncRNAs have a role in carcinogenesis and cancer spread by suppressing tumour suppressors or activating oncogenes through various methods such as epigenetic alteration, alternative splicing, RNA decay, and posttranslational modification regulation [<a href="#B25-biomolecules-12-00462" class="html-bibr">25</a>]. Lysine (K)-specific demethylase 1A (LSD1) as the core of the LSD1/CoREST/REST repressor complex and histone demethylase could specifically demethylate H3K4me1/2. Recent studies have shown that multiple tumour-related lncRNAs regulated cancer progression through interactions with enhancer of Zeste 2 Polycomb repressive complex 2 subunit (EZH2) and LSD1 [<a href="#B21-biomolecules-12-00462" class="html-bibr">21</a>].</div><section id='sec2dot1dot1-biomolecules-12-00462' type=''><h4 class='' data-nested='3'> 2.1.1. LSD1 and LincRNAFEZF1-AS1</h4><div class='html-p'>LSD1 can hyperactivate GC cells aided by LincRNAFEZF1-AS1 to repress p21 expression [<a href="#B26-biomolecules-12-00462" class="html-bibr">26</a>]. Shin et al. showed that endogenous FEZF1-AS1 was enriched in the anti-LSD1 RIP fraction in AGS and SGC-7901 gastric adenocarcinoma cell lines, concluding that LSD1 could promote GC cell proliferation [<a href="#B27-biomolecules-12-00462" class="html-bibr">27</a>]. Knocking down LSD1 by si-RNA in AGS and SGC-7901 cells upregulated p21 protein levels [<a href="#B28-biomolecules-12-00462" class="html-bibr">28</a>]. Moreover, p21 was enhanced in AGS and SGC-7901 cells treated with an LSD1 inhibitor compared to untreated cells, suggesting that FEZF1-AS1 regulates p21 through LSD1-mediated demethylation. To sum up, this study reported that LSD1 could directly bind to the promoter region of p21 and mediate H3K4me2 modification, while knockdown of FEZF1-AS1 led to reduced LSD1 and increased H3K4me2 demethylation ability [<a href="#B21-biomolecules-12-00462" class="html-bibr">21</a>]. </div></section><section id='sec2dot1dot2-biomolecules-12-00462' type=''><h4 class='' data-nested='3'> 2.1.2. LSD1 and lncRNA HOXA11-AS</h4><div class='html-p'>HOXA11-AS is a GC–specific upregulated lncRNA since its expression levels are increased in GC compared to normal gastric tissues [<a href="#B29-biomolecules-12-00462" class="html-bibr">29</a>]. Sun et al. investigated the potential mechanisms of HOXA11-AS and LSD1 in GC cells, concluding that HOXA11-AS RNAs are more prevalent in the nucleus of a panel of GC cells [<a href="#B30-biomolecules-12-00462" class="html-bibr">30</a>]. Additionally, it was predicted that lncRNA HOXA11-AS mediates EZH2 and LSD1 interaction [<a href="#B31-biomolecules-12-00462" class="html-bibr">31</a>]. At the same time, DNMT1, EZH2, and LSD1 are also likely to be recruited by other sequence-specific transcription factors [<a href="#B32-biomolecules-12-00462" class="html-bibr">32</a>]. Since HOXA11-AS potentially binds LSD1 in GC cells, it is predicted to function as a scaffold to regulate PRSS8 and KLF2 transcription [<a href="#B33-biomolecules-12-00462" class="html-bibr">33</a>].</div></section><section id='sec2dot1dot3-biomolecules-12-00462' type=''><h4 class='' data-nested='3'> 2.1.3. LSD1 and Long Noncoding RNA FOXD2-AS1</h4><div class='html-p'>There are increasing data indicating that FOXD2-AS1 serves as an important modulator in biological processes and is dysregulated in GC, in which it could potentially serve as a tumour biomarker [<a href="#B34-biomolecules-12-00462" class="html-bibr">34</a>]. It has been shown to act as a tumour inducer in GC, in part through EphB3 inhibition through direct interaction with EZH2 and LSD1 [<a href="#B35-biomolecules-12-00462" class="html-bibr">35</a>]. FOXD2-AS1 accumulates in GC and is upregulated in GC cells and positively correlates with large tumour size, advanced pathological stage, and poor prognosis [<a href="#B35-biomolecules-12-00462" class="html-bibr">35</a>,<a href="#B36-biomolecules-12-00462" class="html-bibr">36</a>]. Gene set enrichment analysis in Gene Expression Omnibus (GEO) datasets revealed that cell cycle and DNA replication-associated genes were enriched in patients with high FOXD2-AS1 expression [<a href="#B37-biomolecules-12-00462" class="html-bibr">37</a>]. Loss of FOXD2-AS1 function inhibited cell growth through cell cycle inhibition in GC, while upregulation of FOXD2-AS1 expression promoted cancer progression [<a href="#B38-biomolecules-12-00462" class="html-bibr">38</a>,<a href="#B39-biomolecules-12-00462" class="html-bibr">39</a>]. </div></section><section id='sec2dot1dot4-biomolecules-12-00462' type=''><h4 class='' data-nested='3'> 2.1.4. LSD1 and LINC00673</h4><div class='html-p'>Long noncoding RNA LINC00673 is overexpressed in GC [<a href="#B40-biomolecules-12-00462" class="html-bibr">40</a>], in which it acts as a scaffold for LSD1 and EZH2 and represses KLF2 and LATS2 expression. Indeed, LINC00673 binds directly to EZH2, LSD1, DNMT1, and STAU1 in GC cells. When BGC823 and AGS cells were treated with both EZH2 and LSD1 siRNAs the expression of the tumour suppressor LATS2 and KLF2 was enhanced, whereas no effect was observed on CADM4 expression [<a href="#B24-biomolecules-12-00462" class="html-bibr">24</a>].</div></section></section><section id='sec2dot2-biomolecules-12-00462' type=''><h4 class='html-italic' data-nested='2'> 2.2. LSD2 in Gastric Cancer</h4><div class='html-p'>ADPGK antisense RNA 1 (ADPGK-AS1) promotes GC development through upregulation of LSD2 by sponging miR-3196, making it a potential new prognostic biomarker and therapeutic target for GC patients, and ADPGK-AS1 is dramatically overexpressed in GC cell lines compared to normal gastric epithelial cell lines [<a href="#B11-biomolecules-12-00462" class="html-bibr">11</a>]. Furthermore, GC patients with high ADPGK-AS1 levels had a poorer overall survival rate than GC patients with low ADPGK-AS1 levels [<a href="#B41-biomolecules-12-00462" class="html-bibr">41</a>]. Inhibition of ADPGKAS1 markedly accelerated GC cell apoptosis [<a href="#B42-biomolecules-12-00462" class="html-bibr">42</a>] and downregulated LSD2 protein levels, and this phenotype was partially rescued by inhibition of miR3196 [<a href="#B43-biomolecules-12-00462" class="html-bibr">43</a>]. Similarly, upon LSD2 overexpression, cell proliferation due to inhibition of ADPGKAS1 was mostly restored and the facilitating effect of inhibition of ADPGKAS1 on apoptosis was partially abolished [<a href="#B43-biomolecules-12-00462" class="html-bibr">43</a>]. Increased expression of ADPGKAS1 and LSD2 may be directly related to the PI3K/AKT/mTOR signalling pathway in GC tissues [<a href="#B11-biomolecules-12-00462" class="html-bibr">11</a>]. In addition, ADPGKAS1 downregulates p53 through the regulation of LSD2 [<a href="#B44-biomolecules-12-00462" class="html-bibr">44</a>] </div><div class='html-p'>There is little literature regarding the role of LSD1 and LSD2 in GC (<a href="#biomolecules-12-00462-t001" class="html-table">Table 1</a>), and the main conclusions are summarised in <a href="#biomolecules-12-00462-f001" class="html-fig">Figure 1</a>.</div></section></section><section id='sec3-biomolecules-12-00462' type=''><h2 data-nested='1'> 3. Liver Cancer</h2><div class='html-p'>Cancers of the liver pose a great challenge to global health with the overall cases expected to rise to more than one million by the year 2025 [<a href="#B45-biomolecules-12-00462" class="html-bibr">45</a>,<a href="#B46-biomolecules-12-00462" class="html-bibr">46</a>]. Liver cancers are mostly driven by hepatocellular carcinomas (HCC), which are associated with hepatitis B and C infections leading to cirrhosis and other chronic liver diseases [<a href="#B45-biomolecules-12-00462" class="html-bibr">45</a>]. The primary liver cancer is HCC with risk factors involving long-term liver diseases [<a href="#B47-biomolecules-12-00462" class="html-bibr">47</a>] and higher consumption of alcohol along with fat accumulation in the organ (liver) [<a href="#B48-biomolecules-12-00462" class="html-bibr">48</a>]. The standard diagnostic procedures for liver cancer include liver biopsy, imaging tests, and liver function tests of the blood. The treatment strategies vary along the spectrum of the disease in terms of severity and liver function of the patients. The general treatments for liver cancer including HCCs are surgical resection of cancer, transplant surgery to replace the diseased liver with a liver from a healthy donor, ablation therapy for killing cancer cells by microwaves or radiation, heat or cold (cryoablation), chemotherapy, radiation therapy, targeted drug delivery approaches, and immunotherapy [<a href="#B49-biomolecules-12-00462" class="html-bibr">49</a>,<a href="#B50-biomolecules-12-00462" class="html-bibr">50</a>,<a href="#B51-biomolecules-12-00462" class="html-bibr">51</a>,<a href="#B52-biomolecules-12-00462" class="html-bibr">52</a>,<a href="#B53-biomolecules-12-00462" class="html-bibr">53</a>]. </div><section id='sec3dot1-biomolecules-12-00462' type=''><h4 class='html-italic' data-nested='2'> 3.1. LSD1 in Liver Cancer</h4><div class='html-p'>The poor prognosis of HCC has been linked to the differentiation and self-renewal capacities of the cancer stem cells (CSCs), which are characterised by different cellular markers [<a href="#B54-biomolecules-12-00462" class="html-bibr">54</a>]. The self-renewal capacity of CSCs is a topic of interest in oncology and the mechanisms remain to be investigated; however, the tumorigenicity of these specialised cells has been associated with players involved in epigenetic dysregulation such as lysine demethylases including LSD1 that is a chromatin modification factor and acts to demethylase histone H3 lysine 9 (H3K9) along with the histone 3 lysine 4 (H3K4). These histones generally function in the regulation of stem cells and genome instability leading to cancers [<a href="#B55-biomolecules-12-00462" class="html-bibr">55</a>,<a href="#B56-biomolecules-12-00462" class="html-bibr">56</a>]. The hematopoietic and embryonic stem cells have pluripotency that is regulated from the epigenetic regulator LSD1 [<a href="#B57-biomolecules-12-00462" class="html-bibr">57</a>,<a href="#B58-biomolecules-12-00462" class="html-bibr">58</a>,<a href="#B59-biomolecules-12-00462" class="html-bibr">59</a>].</div><div class='html-p'>Since LSD1 is involved in the regulation of pluripotent cancer cells, the inhibition of this important class of enzymes poses an important treatment or targeting strategy for cancer therapy [<a href="#B60-biomolecules-12-00462" class="html-bibr">60</a>,<a href="#B61-biomolecules-12-00462" class="html-bibr">61</a>]. The development and stemness of HCC are promoted due to suppression of the negative regulators such as beta-catenin in Lgr5p cancer cells expressing higher levels of LSD1 [<a href="#B62-biomolecules-12-00462" class="html-bibr">62</a>]. The CSCs associated with HCC exhibit higher levels of LSD1 as compared to non-CSCs, and the higher expression of LSD1 is reduced in differentiated CSCs. The self-renewal capacity of non-CSCs is increased due to overexpression of LSD1 showing that LSD1 is involved in the tumorigenicity of HCC. The high activity of LSD1 is inversely correlated with acetylation as the level of acetylation of LSD1 is reduced in CSC, which shows higher self-renewal capability [<a href="#B62-biomolecules-12-00462" class="html-bibr">62</a>]. The activation of LSD1 results from the induction of sirtuin SIRT1 by Notch signalling, which is involved in the self-renewal of CSCs and represents one of the mechanisms by which LSD1 exerts its function in the promotion of HCC (<a href="#biomolecules-12-00462-f002" class="html-fig">Figure 2</a>). CSC self-renewal mediated through Notch-3 signalling results from cancer-associated fibroblasts as upstream drivers with higher LSD1 expression. Therefore, the microenvironment of the tissue inside liver cancer plays a significant role in driving the role of LSD1 in Notch signalling and stemness of the CSCs, which can be targeted for therapeutic purposes [<a href="#B62-biomolecules-12-00462" class="html-bibr">62</a>].</div><div class='html-p'>The expression of LSD1 is higher in liver cancer tissues compared to noncancerous tissue adjacent to the tumour as determined by immunohistochemistry and Western blotting [<a href="#B63-biomolecules-12-00462" class="html-bibr">63</a>]. Furthermore, lower tumour stages also exhibit lower expression of LSD1 as compared to higher tumour stages. In liver cancer cell lines, the knockdown of LSD1 results in decreased proliferation along with reduced expression of cMyc and Bcl-2, implying that LSD1 is involved in the survival of cells [<a href="#B63-biomolecules-12-00462" class="html-bibr">63</a>]. Additionally, Kim et al. [<a href="#B64-biomolecules-12-00462" class="html-bibr">64</a>] estimated approximately 77% of the 303 patients with HCC (<span class='html-italic'>n</span> = 303 cases of HCC) where positive for LSD1 protein expression by immunohistochemical analysis. Higher expression of LSD1 was associated with poorer outcomes for HCC, especially for disease-free survival and overall survival. The authors also used CRISPR/Cas9 system to knock out LSD1 in HCC cell lines and showed that LSD1 is involved in the control of growth rate. Furthermore, the LSD1 knockout resulted in increased H3K9me1/2 and HeK4me1/2 levels along with reduced S-phase population, probably by targeting retinoic acid pathway [<a href="#B64-biomolecules-12-00462" class="html-bibr">64</a>]. In summary, according to this study, LSD1 could be a potential therapeutic target for HCC and needs to be explored further for its role in HCC. An overview of LSD1 involvement in HCC is shown in <a href="#biomolecules-12-00462-f002" class="html-fig">Figure 2</a>.</div><section id='LSD1InhibitionasaTreatmentStrategyforLiverCancer' type=''><h4 class='' data-nested='3'> LSD1 Inhibition as a Treatment Strategy for Liver Cancer</h4><div class='html-p'>Since overexpression of LSD1 has been associated with various forms of cancer and silencing LSD1 reduces the migration, invasion, and proliferation of cancer cells, inhibition of LSD1 is considered one of the clinical interventions in liver cancer [<a href="#B62-biomolecules-12-00462" class="html-bibr">62</a>,<a href="#B63-biomolecules-12-00462" class="html-bibr">63</a>,<a href="#B65-biomolecules-12-00462" class="html-bibr">65</a>,<a href="#B66-biomolecules-12-00462" class="html-bibr">66</a>]. Therefore, LSD1 inhibitors are used as potential anti-cancer drugs [<a href="#B67-biomolecules-12-00462" class="html-bibr">67</a>]. Drug resistance in cancer is one of the major problems that requires attention; for example, oxaliplatin is a drug used as a chemotherapeutic agent in the therapy of HCC. However, drug resistance to oxaliplatin is a challenge for healthcare professionals and currently jeopardizes its use as a therapy for HCC. One of the mechanisms by which HCC attains drug resistance is via up-regulation of long non-coding RNAs such as LINC01134. The LINC01134 promoter is demethylated by LSD1 and leads to up-regulation of LINC01134, which, in turn, stabilizes p62 and assists in the activation of anti-oxidative stress pathway in HCC tissues and cells [<a href="#B68-biomolecules-12-00462" class="html-bibr">68</a>]. Therefore, LSD1 inhibition by specific inhibitors can be a potential option against chemo-resistance in HCC. Recently, novel small molecule inhibitors against LSD1, such as coumarin analogues and benzofuran derivatives, have been synthesized and can be utilized for targeting the cellular activity of LSD1 [<a href="#B69-biomolecules-12-00462" class="html-bibr">69</a>,<a href="#B70-biomolecules-12-00462" class="html-bibr">70</a>]. Moreover, tertiary sulphonamide derivatives exhibiting dual properties of inhibition of tubulin polymerization and LSD1 inhibition have recently been implicated as potential treatment for liver cancer [<a href="#B71-biomolecules-12-00462" class="html-bibr">71</a>].</div></section></section><section id='sec3dot2-biomolecules-12-00462' type=''><h4 class='html-italic' data-nested='2'> 3.2. LSD2 in Liver Cancer</h4><div class='html-p'>In the context of liver cancer, the Huh7 and Hep3b HCC cell lines exhibit upregulated LSD2 according to a comprehensive study designed to identify the targets involved in epigenetic alterations of these cells [<a href="#B72-biomolecules-12-00462" class="html-bibr">72</a>]. In another study involving HCC cell lines for sorafenib resistance, the expression of LSD2 did not change and LSD1 was found to be a regulator of drug resistance in which LSD2 depletion resulted in no apparent change in drug sensitivity [<a href="#B73-biomolecules-12-00462" class="html-bibr">73</a>]. Apart from these aforementioned studies, there is a dearth of data on LSD2 in the context of liver cancer and it is a potential subject of future research which needs to be explored.</div><div class='html-p'>The recent publications regarding the role of LSD1 and LSD2 in liver cancer are summarised in <a href="#biomolecules-12-00462-t002" class="html-table">Table 2</a>.</div></section></section><section id='sec4-biomolecules-12-00462' type=''><h2 data-nested='1'> 4. Pancreatic Cancer</h2><div class='html-p'>LSD1 seems to be involved in the progression of pancreatic cancer as it is a target for various long non-coding RNAs involved in this process [<a href="#B22-biomolecules-12-00462" class="html-bibr">22</a>]. Lian et al. [<a href="#B74-biomolecules-12-00462" class="html-bibr">74</a>] identified that HOXA cluster antisense RNA 2 (HOXA-AS2) exerts an oncogene function via interaction with LSD1. HOXA-AS2 is upregulated in pancreatic cancer tissue, promoting pancreatic cancer cell proliferation and reducing apoptotic rates in vitro (PANC-1 and BxPC-3 cell lines), and plays an important role in pancreatic cancer cells tumorigenesis in vivo (xenograft assays using BxPC-3 cells into BALB/c mice). Using RNA-protein interaction prediction, it was found that HOXA-AS2 binds with LSD1 and EZH2. RNA immunoprecipitation assays performed using LSD1 antibodies prove that HOXA-AS2 does, in fact, bind to LSD1 in BxPC-3 cells. Moreover, a positive correlation between LSD1 mRNA levels and HOXA-AS2 expression has been observed thanks to data on pancreatic cancer gene expression (GSE15471) obtained from the Gene Expression Omnibus database (GEO). Altogether, these results suggest that LSD1 functions as an oncogene in pancreatic cancer cells as it is involved in a lncRNA-HOXA-AS2/EZH2/LSD1 complex which promotes cell proliferation [<a href="#B74-biomolecules-12-00462" class="html-bibr">74</a>]. </div><div class='html-p'>HOXA-AS2 is not the only lncRNA that has been associated with LSD1 in pancreatic cancer cells. Double homeobox A pseudogene 10 (DUXAP10)-derived lncRNA also plays an important role in pancreatic cancer cells. This lncRNA is upregulated in human pancreatic cancer tissues and is associated with poor prognosis/advanced tumour-node-metastasis (TNM) stages. According to Lian et al., DUXAP10 positively correlates with cell proliferation pathways, reduces apoptotic rates, enables higher cell migration and invasion rates in vitro (PANC-1 and BxPC-3 cell lines) and also inhibits pancreatic cancer cell tumorigenesis in vivo (xenograft assays using BxPC-3 into BALB/c mice). Since lncRNAs are known to interact with RNA binding proteins, the authors performed an RNA protein interaction prediction assay, concluding that DUXAP10 interacts with LSD1 and EZH2. This interaction was verified via RNA immunoprecipitation assays performed using LSD1 antibodies in BxPC-3 cells. Furthermore, a positive correlation was found between DUXAP10 expression and LSD1 mRNA levels. The reduction in BxPC-3 cell viability when treated with si-DUXAP10 and si-LSD1 is greater than when treated only with si-LSD1. Thus, LSD1 seems to play an important role in pancreatic cancer cell proliferation as it binds to DUXAP10 [<a href="#B75-biomolecules-12-00462" class="html-bibr">75</a>]. </div><div class='html-p'>Regarding LSD2, Wang et al. proposed that it may be involved in the development of pancreatic cancer. An increased LSD2 expression in pancreatic cancer cells has been established by immunohistochemistry using an antibody against LSD2 in cancer tissue samples compared with their respective matching paracancerous tissue samples, as well as by immunoblotting using human pancreatic cancer cell lines (BxPC-3, CFPAC-1, PANC-, SW1990) and a normal human pancreatic duct epithelial cell line (HDPE6-C7). This increase in LSD2 expression is accompanied by suppression of cell proliferation and increase in apoptosis. When the pancreatic cancer cell lines PANC-1 and SW1990 are treated with shLSD2 resulting in LSD2 knockdown cells, in vitro cell growth is significantly reduced and apoptosis increases. Moreover, caspase 3 and caspase 7 levels and activity are increased in PANC-1 and SW1990 knockdown cells. Thus, LSD2 expression is an important determinant of apoptosis in these cell lines [<a href="#B76-biomolecules-12-00462" class="html-bibr">76</a>].</div><div class='html-p'>The main findings concerning the role of LSD1 and LSD2 in pancreatic cancer are summarised in <a href="#biomolecules-12-00462-t003" class="html-table">Table 3</a> and <a href="#biomolecules-12-00462-f003" class="html-fig">Figure 3</a>.</div></section><section id='sec5-biomolecules-12-00462' type=''><h2 data-nested='1'> 5. Colorectal Cancer</h2><section id='sec5dot1-biomolecules-12-00462' type=''><h4 class='html-italic' data-nested='2'> 5.1. LSD1 in Colorectal Cancer</h4><div class='html-p'>LSD1 has been reported to be overexpressed in CRC. Overexpression of LSD1 in CRC, as in various other cancer types, facilitates proliferation, migration, invasion and stemness, and is associated with higher TNM stages [<a href="#B77-biomolecules-12-00462" class="html-bibr">77</a>,<a href="#B78-biomolecules-12-00462" class="html-bibr">78</a>,<a href="#B79-biomolecules-12-00462" class="html-bibr">79</a>]. Despite these findings being coherent with other studies about LSD1 in cancer, other studies suggest that LSD1 is negatively associated with CRC tumorigenesis. Ramírez-Ramírez et al. established that loss of LSD1 is significantly associated with metastasis to lymph nodes and TNM stages III-IV after analysing CRC tissues. The data presented in this study suggest that LSD1 gene suppression is key during metastasis. These opposite facts may be due to the genetic background of the cells as well as the effect of environmental signals on LSD1. Additionally, consider that metastasis is a different process from carcinogenesis itself [<a href="#B80-biomolecules-12-00462" class="html-bibr">80</a>]. Furthermore, Carvalho et al. established that those patients who display low LSD1 expression levels (analysed by immunohistochemistry) in their CRC tumours experienced significantly lower disease-specific survival and disease-free survival. In this case, these results may differ from other studies with limitations such as low sample size, different methods to assess LSD1 expression and unknown factors in the genetic and/or environment background which may affect LSD1 regulation [<a href="#B81-biomolecules-12-00462" class="html-bibr">81</a>].</div><div class='html-p'>As LSD1 has been associated with invasion and metastasis in some cancer types, the association between LSD1 and stemness features in CRC has been studied by analysing CD133+ CRC cells. CD133 is a surface marker for CRC stem cells associated with higher viability and colony formation rate. LSD1 expression is higher in CD133+ CRC cells and is associated with stemness, not only in vitro, but in vivo as well (xenograft assays using SW620 in BALB/c mice). LSD1 knockdown increases the apoptotic rate and further decreases cell viability, colony formation rate, migration, and invasion of CD133+ cells in response to anti-cancer drugs [<a href="#B77-biomolecules-12-00462" class="html-bibr">77</a>]. </div><div class='html-p'>To better understand the role of LSD1 in CRC, Chen et al. performed an LSD1 downstream target analysis in which they found 4 key LSD1-target genes associated with proliferation, metastasis, and invasion: CABYR, FOX2, TLE4 and CDH1. Moreover, they established that LSD1 overexpression mediates CABYR and CDH1 downregulation by decreasing the levels of H3K4me1 and H3K4me2 at their promoter regions [<a href="#B78-biomolecules-12-00462" class="html-bibr">78</a>]. </div><div class='html-p'>Some studies associate LSD1 with PI3K/AKT, thus partly explaining LSD1-mediated cell proliferation. LSD1 correlates with AKT phosphorylation (pS473-AKT). LSD1 regulation effects on pS473-AKT do not rely on LSD1 catalytic activity, but rather on its scaffolding function for the CoREST complex. By regulating AKT, LSD1 regulates Snail protein stability, an epidermal-mesenchymal promoting transcription factor, at least in PIK3CA mutated cells in which LSD1 is highly expressed [<a href="#B82-biomolecules-12-00462" class="html-bibr">82</a>]. LSD1 in CRC also affects PI3K/AKT via RIOK1. Furthermore, LSD-dependent demethylation of RIOK1 in CRC significantly stabilizes RIOK1 proteins, promoting CRC cell proliferation and migration through PI3K/AKT [<a href="#B83-biomolecules-12-00462" class="html-bibr">83</a>].</div><div class='html-p'>LSD1 not only affects the proliferation process of CRC cells, but also the differentiation process. In BRAF mutant CRC, LSD1 is required for maintenance of enteroendocrine progenitors. Thus, LSD1 is associated with a secretory phenotype in BRAF mutant CRC. Not only is LSD1 associated with the differentiation of enteroendocrine cells, but it is also associated with TFF3 expression and protein secretion, which is critical for cell survival during growth factor signalling; in fact, it is involved in AKT phosphorylation in S437 [<a href="#B79-biomolecules-12-00462" class="html-bibr">79</a>].</div><div class='html-p'>In terms of LSD1 regulation, after screening an 80-gene deubiquitinase bank, the USP38 protein was identified as a LSD1 deubiquitinase stabilizing its protein levels via posttranslational modification. Therefore, by removing the ubiquitin chain from the LSD1 protein, USP38 enhances the activity of the signalling pathways activated by LSD1, enhancing proliferation, colony formation and antiapoptotic proteins [<a href="#B84-biomolecules-12-00462" class="html-bibr">84</a>].</div><div class='html-p'>Other relevant proteins have been positively correlated with LSD1, such as Tenascin C (TNC), and Tetraspanin 8 (TSPAN8), among others [<a href="#B85-biomolecules-12-00462" class="html-bibr">85</a>,<a href="#B86-biomolecules-12-00462" class="html-bibr">86</a>]. In fact, data show that TSPAN8, a transmembrane protein, enhances the tumorigenicity of CRC as it produces the same effects as LSD1. It has been established that LSD1 upregulates TSPAN8 reducing H3K9me2 occupancy on its promoter. Considering that TSAPN8 and LSD1 depletion results in an upregulation of E-cadherin and ZO-1, and a downregulation of <span class='html-small-caps'>n</span>-cadherin, Vimentin, Slug and Snail, TSPAN8 may promote epithelial-mesenchymal transition in an LSD-1 dependent manner [<a href="#B86-biomolecules-12-00462" class="html-bibr">86</a>].</div><div class='html-p'>Finally, in addition to the aforementioned pathways, LSD1 plays a significant role in lipid regulation in CRC. As in vitro data suggest, LSD1 may play a critical role in cancer lipid metabolism. Treatment with an LSD1 inhibitor produces lipid dysregulation specially in sphingolipids and glycolipids, enhancing lipids such as ceramides and sphingomyelins. These lipids are bioactive and are involved in signalling pathways including apoptosis. Therefore, these findings may establish a connection between LSD1-mediated apoptosis and lipid metabolism [<a href="#B87-biomolecules-12-00462" class="html-bibr">87</a>]. </div><section id='LSD1AssociatedNoncodingRNAsInvolvedinColorectalCancerProgression' type=''><h4 class='' data-nested='3'> LSD1-Associated Noncoding RNAs Involved in Colorectal Cancer Progression</h4><div class='html-p'>Several long noncoding RNAs (lncRNAs) have been associated with LSD1 in CRC. Pseudogene-expressed lncRNA DUXAP10 is upregulated in human CRC and positively correlates with tumour size, TNM stage and lymph node metastasis. Thanks to RNA-protein interaction prediction and posterior ChIP assays, it has been established that DUXAP10 binds to LSD1 in some CRC cell lines mediating H3K4me2 demethylation in the p21 and PTEN promoter regions, which explains the DUXAP10 proliferation effects [<a href="#B88-biomolecules-12-00462" class="html-bibr">88</a>]. Similarly, lncRNA DUXAP8 is upregulated in human CRC cells and accelerates their proliferation via binding to LSD1 and EZH2 [<a href="#B89-biomolecules-12-00462" class="html-bibr">89</a>]. In addition to the aforementioned lncRNAs, ZEB2-AS1 and HOXA-AS2 are upregulated in CRC and are associated with increased proliferation rate, tumour size, higher TNM stage and lymph node metastasis. Both ZEB-AS1 and HOXA-AS2 bind to LSD1 possibly accelerating the cell proliferative rate [<a href="#B90-biomolecules-12-00462" class="html-bibr">90</a>,<a href="#B91-biomolecules-12-00462" class="html-bibr">91</a>]. Regarding HOXA-AS2, data suggest that it binds to LSD1 and silences p21 and KLF2 transcription as it enhances H3K4me2 demethylation in their promoters [<a href="#B91-biomolecules-12-00462" class="html-bibr">91</a>]. </div><div class='html-p'>MicroRNAs are other important noncoding RNAs in cancer. miR-137-3p is one of the microRNAs that are downregulated in various cancers, including CRC. Its downregulation is associated with invasiveness of CRC cells. This microRNA negatively regulates LSD1 expression, thereby decreasing cell adhesion and migration. miR-137-3p and LSD1 both respond to hypoxia and data suggest that a hypoxic CRC environment could induce mi-R-137-3p repression, thus derepressing LSD1 expression to induce the EMT program and tumour metastasis [<a href="#B92-biomolecules-12-00462" class="html-bibr">92</a>]. </div></section></section><section id='sec5dot2-biomolecules-12-00462' type=''><h4 class='html-italic' data-nested='2'> 5.2. LSD2 in Colorectal Cancer</h4><div class='html-p'>Similar to LSD1, LSD2 is upregulated in human CRC cells, both in vitro and in vivo. High levels of LSD2 promote cell proliferation, DNA synthesis, colony formation rate and colony size. Data show that LSD2 induces cell cycle progression and reduces apoptosis by reducing apoptosis inhibitor Bcl-2 levels and increasing cleaved caspase 3, cleaved caspase 9 and apoptosis sensor BAX levels. Moreover, LSD2 downregulates p53 expression through H3K4me2 demethylation in the p53 promoter region, thus driving the cell cycle through p53-p21-Rb. In fact, LSD2 is associated with a decrease in p53 and p21 protein levels and an increase of Rb protein levels [<a href="#B44-biomolecules-12-00462" class="html-bibr">44</a>]. </div><div class='html-p'>The main findings concerning the role of LSD1 and LSD2 in CRC are summarised in <a href="#biomolecules-12-00462-t004" class="html-table">Table 4</a> and <a href="#biomolecules-12-00462-f004" class="html-fig">Figure 4</a>.</div></section></section><section id='sec6-biomolecules-12-00462' type=''><h2 data-nested='1'> 6. Therapeutic Implications of LSD1 and LSD2 in Various Cancers</h2><div class='html-p'>The majority of research defining the role of LSD1 in metabolism is connected to cancer biology, and little is known about the participation of LSD1 in endothelial cell proliferation, which is critical for circulatory functions and cancer development and metastasis [<a href="#B93-biomolecules-12-00462" class="html-bibr">93</a>]. The expression of LSD1 being higher in cancers leads to a proposition of it being an anti-cancer target and various studies report that the pharmacological inhibition of LSD1 could be a potential treatment strategy for various cancers [<a href="#B94-biomolecules-12-00462" class="html-bibr">94</a>]. The synthetic compounds, peptides, and natural products have been reported as numerous LSD1 inhibitors [<a href="#B95-biomolecules-12-00462" class="html-bibr">95</a>,<a href="#B96-biomolecules-12-00462" class="html-bibr">96</a>]. New irreversible LSD1 inhibitors have been designed by using tranylcypromine (TCP) scaffolds and have been tested in clinical trials together with other agents. In addition, other LSD1-specific inhibitors such as ORY-2001, IMG-7289, GSK2879552, and ORY-1001, can target LSD1 with more potency, compared to TCP and they may be useful for other cancer type treatments, such as acute myeloid leukaemia [<a href="#B67-biomolecules-12-00462" class="html-bibr">67</a>]. Nevertheless, to date, there are no LSD1 or LSD2 inhibitors approved for neither pancreatic cancer nor colorectal cancer [<a href="#B97-biomolecules-12-00462" class="html-bibr">97</a>,<a href="#B98-biomolecules-12-00462" class="html-bibr">98</a>]. Fang et al. summarized the toxicity profiles of various LSD1 inhibitors used on patients in clinical trials and have provided recommendations for designing the dosing regimens along with the in-depth mechanistic studies required for LSD1 inhibitors in pre-clinical setups and the development of safer profiles based on potent and selective inhibitors [<a href="#B67-biomolecules-12-00462" class="html-bibr">67</a>]. GSK2879552, which is an LSD1-specific inhibitor, showed lesser potency for cell proliferation assays as compared to dual inhibitors that target HDAC1/2 in vitro [<a href="#B99-biomolecules-12-00462" class="html-bibr">99</a>]. Therefore, the dual inhibitors targeting LSD1 and HDAC may confer better outcomes in clinical applications for the treatment of cancers. Moreover, apart from demethylase activity exhibited by LSD1, there are other functions of LSD1 such as interaction and degradation of a tumour suppressor FBXW7 [<a href="#B100-biomolecules-12-00462" class="html-bibr">100</a>]. Therefore, inhibitors targeting the non-enzymatic activity of LSD1 can also be considered as potential anti-cancer therapeutic options. Remarkably, some of the LSD1 inhibitors might also have an effect on the activity of LSD2 because of the similarities in their catalytic domains, and LSD2-specific inhibitors are, up to now, unavailable [<a href="#B10-biomolecules-12-00462" class="html-bibr">10</a>].</div><div class='html-p'>LSD2 is also a promising epigenetic target for treating various types of cancer. However, despite significant advances in understanding the structural and functional aspects of LSD2 function, the underlying molecular mechanisms involved in cancer biology have not been conclusively established. LSD2 was initially identified to maintain low levels of H3K4 methylation in the renal region. This enzyme can promote gene expression by removing the inhibitory H3K4 methylation mark (H3K4me1 or H3K4me2) [<a href="#B101-biomolecules-12-00462" class="html-bibr">101</a>]. Recent reports have shown that aberrant LSD2 expression is often associated with dysregulation of histone activity, which contributes to aberrant gene expression in some cancers such as glioblastoma, breast cancer, pancreatic cancer, and GC [<a href="#B102-biomolecules-12-00462" class="html-bibr">102</a>].</div><div class='html-p'>As described previously, LSD1 is overexpressed in various cancer cells including ER-negative breast cancer, bladder, prostate, lymphoid neoplasm, lung cancer, and acute myeloid leukaemia cells, and is associated with poor prognosis of various tumours. LSD1 promoting AML via H3K4 demethylation for the regulation of erythrocyte differentiation along with mediating GFi1 and GF1ib for regulating hematopoietic differentiation are the mechanisms that can be targeted for AML differentiation [<a href="#B103-biomolecules-12-00462" class="html-bibr">103</a>,<a href="#B104-biomolecules-12-00462" class="html-bibr">104</a>]. Moreover, LSD1 has been linked with the pathways involved in promoting growth, metastasis, invasion, migration, and proliferation of cancer cells [<a href="#B67-biomolecules-12-00462" class="html-bibr">67</a>,<a href="#B105-biomolecules-12-00462" class="html-bibr">105</a>]. Therefore, LSD1 presents a viable target as a therapeutic target for various cancers. For example, the SIN3A/HDAC complex involved in the oncogenic potential and survival of breast cancer cells also exhibits LSD1 as one of the functional components [<a href="#B106-biomolecules-12-00462" class="html-bibr">106</a>]. In neuroblastoma, LSD1 displayed an inverse correlation with differentiation and is upregulated in poorly differentiated cancer cells [<a href="#B107-biomolecules-12-00462" class="html-bibr">107</a>]. LSD1 is reported to be an initiating factor of epithelial-mesenchymal-transition (EMT) and is overexpressed in bladder cancer cells [<a href="#B108-biomolecules-12-00462" class="html-bibr">108</a>]. LSD1 also binds with one of its interacting partners ZNF217 and activates key gene networks responsible for prostate cancer survival and proliferation. The demethylase independent functions can be blocked in prostate cancer by targeting LSD1 using its inhibitor named SP-2509 [<a href="#B109-biomolecules-12-00462" class="html-bibr">109</a>]. LSD1 is also overexpressed in Small Cell Lung Cancer (SCLC) where suppression of LSD1 leads to modulation of NOTCH-ASCL1 axis causing inhibition of tumorigenesis and chemoresistance. LSD1 inhibitor ORY-1001 showed significant therapeutic effects in PDX models [<a href="#B110-biomolecules-12-00462" class="html-bibr">110</a>]. Immunotherapy for increasing anti-tumour effects has also been considered as a potential route of application for LSD1 inhibition as LSD1 expression is reported as inversely correlated with cytotoxic T cell attracting chemokines along with the programmed death-ligand 1 (PD-L1) in triple-negative breast cancer (TNBC). Therefore, LSD1 suppression can be effective in providing a tool for adjuvant treatment options in combination with immunotherapy [<a href="#B111-biomolecules-12-00462" class="html-bibr">111</a>]. The poorly immunogenic tumours of the gastrointestinal system can also be explored for the role of LSD1 inhibition as a novel management strategy.</div><div class='html-p'>Growing evidence from these past years shows that LSD1 and LSD2 are key proteins in enabling cancer cells to achieve cancer hallmarks such as genome instability, sustaining proliferative signals or activating invasion and metastasis, not only in cancers of the gastrointestinal system, but also in cancers such as prostate cancer, neuroblastoma, lung cancer and acute myeloid leukaemia [<a href="#B67-biomolecules-12-00462" class="html-bibr">67</a>]. Therefore, it is not bizarre that these discoveries attract the attention of researchers in whether treatments targeting LSD1 and/or LSD2 are feasible. Compounds are being tested in pre-clinical studies obtaining a diverse range of results. Although studies knocking down/out LSD1 show promising results, it is important to bear in mind that results may differ from studies using pharmacological enzymatic inhibition as it is known that noncatalytic LSD1 role is also important in cancer development [<a href="#B112-biomolecules-12-00462" class="html-bibr">112</a>]. The same is applicable for LSD2 for which inhibition has shown also promising results in vitro in some cancers like breast cancer [<a href="#B113-biomolecules-12-00462" class="html-bibr">113</a>], prostate cancer [<a href="#B114-biomolecules-12-00462" class="html-bibr">114</a>], or gastrointestinal system cancers. </div><div class='html-p'>Diverse pharmacological LSD1 inhibitors have been developed, the first one being tranylcypromine (TCP). Nowadays, there are many LSD1 inhibitors with more specificity and potency than TCP [<a href="#B67-biomolecules-12-00462" class="html-bibr">67</a>]. Until 2021, several LSD1 inhibitors including irreversible inhibitors tranylcypromine (TCP), ORY-2001, ORY-1001, GSK-2879552, INCB059872, IMG-7289, TAK-418, and reversible inhibitors CC-90011 and SP-2577 have entered clinical evaluation as mono- or combined therapy for diseases, particularly for AML and small lung cancer cells (SCLC). LSD1 inhibition has aroused interest, especially in acute myeloid leukaemia (AML) and small cell lung carcinoma (SCLC), in fact, TCP derivatives started being studied in oncology clinical trials to assess their value as AML and SCLC treatment [<a href="#B7-biomolecules-12-00462" class="html-bibr">7</a>]. Results for these studies are promising. The novel LSD1 inhibitors and combination regimens provide new therapeutic strategies for AML treatment. In fact, combination therapy may help overcome LSD1 inhibitor resistance. The fact that LSD1 and LSD2 may act synergistically with other pathways opens the door to exploiting the use of LSD1/2 inhibitors in combination therapies [<a href="#B112-biomolecules-12-00462" class="html-bibr">112</a>]. For example, it is shown that LSD1 inhibition is highly synergistic with mTOR inhibitors in endometrial cancer, increasing the limited success that mTOR inhibitors presented [<a href="#B115-biomolecules-12-00462" class="html-bibr">115</a>].</div></section><section id='sec7-biomolecules-12-00462' type='conclusions'><h2 data-nested='1'> 7. Conclusions</h2><div class='html-p'>LSD1 was the first of several protein lysine demethylases discovered. This enzyme is in charge of demethylating mono- and dimethylated lysines in histone H3 at positions 4 or 9. (H3K4 and H3K9, respectively). The extensive ramifications of LSD1-controlled demethylation explain the substrate specificity of histones harbouring lysine-specific demethylase and many crucial non-histone proteins, especially transcription factors, chromatin-regulating proteins, and also tumour suppressor proteins [<a href="#B8-biomolecules-12-00462" class="html-bibr">8</a>]. The control of histone protein demethylation by LSD1 is a key component of the regulatory mechanism of carcinogenesis. As data shows how LSD1 and LSD2 play an important role in cancer development, it is not rare to find a growing interest in LSD inhibition as an anticancer therapy. Since its discovery in 2004, various attempts have been made to uncover the function of LSD1 in different contexts including viral infections and cancers. Further research is needed to elucidate the role of LSD1 and LSD2 in the pathogenesis of cancers of the gastrointestinal system. We expect that further characterisation of the molecular function of LSD1 and LSD2 will pave the way for the development of novel and innovative therapeutic strategies for different types of cancer, including GC, liver cancer, pancreatic cancer, and CRC.</div></section> </div> <div class="html-back"> <section class='html-notes'><h2 >Author Contributions</h2><div class='html-p'>G.M., M.Y., A.J. and T.R.-T. wrote the manuscript. G.M., M.Y., A.J., C.B. and T.R.-T. conceived and revised the manuscript. 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 review received no external funding.</div></section><section class='html-notes'><h2 >Institutional Review Board Statement</h2><div class='html-p'>Not applicable.</div></section><section class='html-notes'><h2 >Conflicts of Interest</h2><div class='html-p'>The authors declare no conflict of interest.</div></section><section id='html-references_list'><h2>References</h2><ol class='html-xxx'><li id='B1-biomolecules-12-00462' class='html-x' data-content='1.'>Cancer. 2022. Available online: <a href='https://www.who.int/news-room/fact-sheets/detail/cancer' target='_blank' rel="noopener noreferrer" >https://www.who.int/news-room/fact-sheets/detail/cancer</a> (accessed on 15 January 2022).</li><li id='B2-biomolecules-12-00462' class='html-x' data-content='2.'>Global Cancer Observatory. 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The green colour represents upregulation while purple represents downregulation of different molecules, which are related to LSD1 and LSD2 upregulation, respectively. <!-- <p><a class="html-figpopup" href="#fig_body_display_biomolecules-12-00462-f001"> Click here to enlarge figure </a></p> --> </div> </div> <div class="html-fig_show mfp-hide" id ="fig_body_display_biomolecules-12-00462-f001" > <div class="html-caption" > <b>Figure 1.</b> LSD1 (<b>left</b> panel) and LSD2 (<b>right</b> panel) expression and its correlation with gastric cancer fate. The green colour represents upregulation while purple represents downregulation of different molecules, which are related to LSD1 and LSD2 upregulation, respectively.</div> <div class="html-img"><img alt="Biomolecules 12 00462 g001" data-large="/biomolecules/biomolecules-12-00462/article_deploy/html/images/biomolecules-12-00462-g001.png" data-original="/biomolecules/biomolecules-12-00462/article_deploy/html/images/biomolecules-12-00462-g001.png" data-lsrc="/biomolecules/biomolecules-12-00462/article_deploy/html/images/biomolecules-12-00462-g001.png" /></div> </div><div class="html-fig-wrap" id="biomolecules-12-00462-f002"> <div class='html-fig_img'> <div class="html-figpopup html-figpopup-link" data-counterslinkmanual = "https://www.mdpi.com/2218-273X/12/3/462/display" href="#fig_body_display_biomolecules-12-00462-f002"> <img alt="Biomolecules 12 00462 g002 550" data-large="/biomolecules/biomolecules-12-00462/article_deploy/html/images/biomolecules-12-00462-g002.png" data-original="/biomolecules/biomolecules-12-00462/article_deploy/html/images/biomolecules-12-00462-g002.png" data-lsrc="/biomolecules/biomolecules-12-00462/article_deploy/html/images/biomolecules-12-00462-g002-550.jpg" /> <a class="html-expand html-figpopup" data-counterslinkmanual = "https://www.mdpi.com/2218-273X/12/3/462/display" href="#fig_body_display_biomolecules-12-00462-f002"></a> </div> </div> <div class="html-fig_description"> <b>Figure 2.</b> LSD1 expression and its correlation with liver cancer fate. The green colour represents upregulation or increase while purple represents decrease, which are related to LSD1 upregulation. <!-- <p><a class="html-figpopup" href="#fig_body_display_biomolecules-12-00462-f002"> Click here to enlarge figure </a></p> --> </div> </div> <div class="html-fig_show mfp-hide" id ="fig_body_display_biomolecules-12-00462-f002" > <div class="html-caption" > <b>Figure 2.</b> LSD1 expression and its correlation with liver cancer fate. The green colour represents upregulation or increase while purple represents decrease, which are related to LSD1 upregulation.</div> <div class="html-img"><img alt="Biomolecules 12 00462 g002" data-large="/biomolecules/biomolecules-12-00462/article_deploy/html/images/biomolecules-12-00462-g002.png" data-original="/biomolecules/biomolecules-12-00462/article_deploy/html/images/biomolecules-12-00462-g002.png" data-lsrc="/biomolecules/biomolecules-12-00462/article_deploy/html/images/biomolecules-12-00462-g002.png" /></div> </div><div class="html-fig-wrap" id="biomolecules-12-00462-f003"> <div class='html-fig_img'> <div class="html-figpopup html-figpopup-link" data-counterslinkmanual = "https://www.mdpi.com/2218-273X/12/3/462/display" href="#fig_body_display_biomolecules-12-00462-f003"> <img alt="Biomolecules 12 00462 g003 550" data-large="/biomolecules/biomolecules-12-00462/article_deploy/html/images/biomolecules-12-00462-g003.png" data-original="/biomolecules/biomolecules-12-00462/article_deploy/html/images/biomolecules-12-00462-g003.png" data-lsrc="/biomolecules/biomolecules-12-00462/article_deploy/html/images/biomolecules-12-00462-g003-550.jpg" /> <a class="html-expand html-figpopup" data-counterslinkmanual = "https://www.mdpi.com/2218-273X/12/3/462/display" href="#fig_body_display_biomolecules-12-00462-f003"></a> </div> </div> <div class="html-fig_description"> <b>Figure 3.</b> LSD1 and LSD2 expression and its correlation with pancreatic cancer fate. The green colour represents upregulation of each specific molecule, which all together leads to increased pancreatic cancer cell proliferation and decreased apoptosis. <!-- <p><a class="html-figpopup" href="#fig_body_display_biomolecules-12-00462-f003"> Click here to enlarge figure </a></p> --> </div> </div> <div class="html-fig_show mfp-hide" id ="fig_body_display_biomolecules-12-00462-f003" > <div class="html-caption" > <b>Figure 3.</b> LSD1 and LSD2 expression and its correlation with pancreatic cancer fate. The green colour represents upregulation of each specific molecule, which all together leads to increased pancreatic cancer cell proliferation and decreased apoptosis.</div> <div class="html-img"><img alt="Biomolecules 12 00462 g003" data-large="/biomolecules/biomolecules-12-00462/article_deploy/html/images/biomolecules-12-00462-g003.png" data-original="/biomolecules/biomolecules-12-00462/article_deploy/html/images/biomolecules-12-00462-g003.png" data-lsrc="/biomolecules/biomolecules-12-00462/article_deploy/html/images/biomolecules-12-00462-g003.png" /></div> </div><div class="html-fig-wrap" id="biomolecules-12-00462-f004"> <div class='html-fig_img'> <div class="html-figpopup html-figpopup-link" data-counterslinkmanual = "https://www.mdpi.com/2218-273X/12/3/462/display" href="#fig_body_display_biomolecules-12-00462-f004"> <img alt="Biomolecules 12 00462 g004 550" data-large="/biomolecules/biomolecules-12-00462/article_deploy/html/images/biomolecules-12-00462-g004.png" data-original="/biomolecules/biomolecules-12-00462/article_deploy/html/images/biomolecules-12-00462-g004.png" data-lsrc="/biomolecules/biomolecules-12-00462/article_deploy/html/images/biomolecules-12-00462-g004-550.jpg" /> <a class="html-expand html-figpopup" data-counterslinkmanual = "https://www.mdpi.com/2218-273X/12/3/462/display" href="#fig_body_display_biomolecules-12-00462-f004"></a> </div> </div> <div class="html-fig_description"> <b>Figure 4.</b> LSD1 (<b>left</b> panel) and LSD2 (<b>right</b> panel) expression and its correlation with colorectal cancer fate. The green colour represents upregulation while purple represents downregulationof each specific molecule, which are related to LSD1 and LSD2 upregulation, respectively. <!-- <p><a class="html-figpopup" href="#fig_body_display_biomolecules-12-00462-f004"> Click here to enlarge figure </a></p> --> </div> </div> <div class="html-fig_show mfp-hide" id ="fig_body_display_biomolecules-12-00462-f004" > <div class="html-caption" > <b>Figure 4.</b> LSD1 (<b>left</b> panel) and LSD2 (<b>right</b> panel) expression and its correlation with colorectal cancer fate. The green colour represents upregulation while purple represents downregulationof each specific molecule, which are related to LSD1 and LSD2 upregulation, respectively.</div> <div class="html-img"><img alt="Biomolecules 12 00462 g004" data-large="/biomolecules/biomolecules-12-00462/article_deploy/html/images/biomolecules-12-00462-g004.png" data-original="/biomolecules/biomolecules-12-00462/article_deploy/html/images/biomolecules-12-00462-g004.png" data-lsrc="/biomolecules/biomolecules-12-00462/article_deploy/html/images/biomolecules-12-00462-g004.png" /></div> </div><div class="html-table-wrap" id="biomolecules-12-00462-t001"> <div class="html-table_wrap_td" > <div class="html-tablepopup html-tablepopup-link" data-counterslinkmanual = "https://www.mdpi.com/2218-273X/12/3/462/display" href='#table_body_display_biomolecules-12-00462-t001'> <img alt="Table" data-lsrc="https://www.mdpi.com/img/table.png" /> <a class="html-expand html-tablepopup" data-counterslinkmanual = "https://www.mdpi.com/2218-273X/12/3/462/display" href="#table_body_display_biomolecules-12-00462-t001"></a> </div> </div> <div class="html-table_wrap_discription"> <b>Table 1.</b> Recent studies on LSD1/2 in gastric cancer. </div> </div> <div class="html-table_show mfp-hide " id ="table_body_display_biomolecules-12-00462-t001" > <div class="html-caption" ><b>Table 1.</b> Recent studies on LSD1/2 in gastric cancer.</div> <table > <thead ><tr ><th align='center' valign='middle' style='border-top:solid thin;border-bottom:solid thin' class='html-align-center' >LSD</th><th align='center' valign='middle' style='border-top:solid thin;border-bottom:solid thin' class='html-align-center' >Model</th><th align='center' valign='middle' style='border-top:solid thin;border-bottom:solid thin' class='html-align-center' >Main Findings</th><th align='center' valign='middle' style='border-top:solid thin;border-bottom:solid thin' class='html-align-center' >Reference</th></tr></thead><tbody ><tr ><td align='center' valign='middle' style='border-bottom:solid thin' class='html-align-center' >LSD1</td><td align='left' valign='middle' style='border-bottom:solid thin' class='html-align-left' >The GC cell lines (MGC-803, SGC-7901 and AGS)</td><td align='left' valign='middle' style='border-bottom:solid thin' class='html-align-left' >LSD1 hyperactivates gastric cancer cells with the assistance of LincRNAFEZF1-AS1 to repress p21 expression. LSD1 promotes GC cell proliferation.</td><td align='center' valign='middle' style='border-bottom:solid thin' class='html-align-center' >[<a href="#B21-biomolecules-12-00462" class="html-bibr">21</a>]</td></tr><tr ><td align='center' valign='middle' style='border-bottom:solid thin' class='html-align-center' >LSD1</td><td align='left' valign='middle' style='border-bottom:solid thin' class='html-align-left' >(BGC823, SGC7901, MGC803, AGS) and normal gastric mucosa GES1 cell lines.</td><td align='left' valign='middle' style='border-bottom:solid thin' class='html-align-left' >HOXA11-AS potentially binds LSD1 in GC cells and functions as a scaffold to regulate PRSS8 and KLF2 at transcriptional level.</td><td align='center' valign='middle' style='border-bottom:solid thin' class='html-align-center' >[<a href="#B30-biomolecules-12-00462" class="html-bibr">30</a>]</td></tr><tr ><td align='center' valign='middle' style='border-bottom:solid thin' class='html-align-center' >LSD1</td><td align='left' valign='middle' style='border-bottom:solid thin' class='html-align-left' >The GC cell lines (GES1, BGC823, AGS, MKN45, SGC7901 and MGC803)</td><td align='left' valign='middle' style='border-bottom:solid thin' class='html-align-left' >FOXD2-AS1 is dysregulated GC. FOXD2-AS1 promotes GC tumorigenesis partly through EZH2- and LSD1-mediated EphB3 downregulation.</td><td align='center' valign='middle' style='border-bottom:solid thin' class='html-align-center' >[<a href="#B35-biomolecules-12-00462" class="html-bibr">35</a>]</td></tr><tr ><td align='center' valign='middle' style='border-bottom:solid thin' class='html-align-center' >LSD1</td><td align='left' valign='middle' style='border-bottom:solid thin' class='html-align-left' >The GC cell lines (GES1, BGC823, AGS, SGC7901 and MGC803)</td><td align='left' valign='middle' style='border-bottom:solid thin' class='html-align-left' >LINC00673 works as a scaffold for LSD1 in GC. LINC00673 binds directly to LSD1 in GC cells. LINC00673 and LSD1 are involved in regulating CADM4, LATS2, and KLF2.</td><td align='center' valign='middle' style='border-bottom:solid thin' class='html-align-center' >[<a href="#B24-biomolecules-12-00462" class="html-bibr">24</a>]</td></tr><tr ><td align='center' valign='middle' style='border-bottom:solid thin' class='html-align-center' >LSD2</td><td align='left' valign='middle' style='border-bottom:solid thin' class='html-align-left' >The GC cell lines (BGC-823, MGC-803, AGS and SGC-7901)</td><td align='left' valign='middle' style='border-bottom:solid thin' class='html-align-left' >Cell proliferation due to inhibition of ADPGKAS1 is mostly restored after overexpression of LSD2.</td><td align='center' valign='middle' style='border-bottom:solid thin' class='html-align-center' >[<a href="#B11-biomolecules-12-00462" class="html-bibr">11</a>]</td></tr><tr ><td align='center' valign='middle' style='border-bottom:solid thin' class='html-align-center' >LSD2</td><td align='left' valign='middle' style='border-bottom:solid thin' class='html-align-left' >AGS and MKN45 gastric cancer cell lines.</td><td align='left' valign='middle' style='border-bottom:solid thin' class='html-align-left' >The PI3K/AKT/mTOR pathway is an important intracellular signalling pathway involved in GC prognosis. ADPGKAS1 activation induces the PI3K/AKT/mTOR signalling pathway to promote GC cell emergence and progression by regulating LSD2/KDM1B in GCs via miR3196.</td><td align='center' valign='middle' style='border-bottom:solid thin' class='html-align-center' >[<a href="#B11-biomolecules-12-00462" class="html-bibr">11</a>,<a href="#B43-biomolecules-12-00462" class="html-bibr">43</a>]</td></tr></tbody> </table> <div class='html-table_foot html-p'><div class='html-p' style='text-indent:0em;'><span class='html-fn-content'>Abbreviations: GC = gastric cancer, MGC-803 = cellosaurus cell line, SGC-7901 = human gastric cancer cell line, AGS = human gastric adenocarcinoma cell, MKN45 = human gastric adenocarcinoma, p21 = potent cyclin-dependent kinase inhibitor, BGC823 = human gastric carcinoma, GES1 = normal gastric epithelium cell, CADM4 = Cell Adhesion Molecule 4, LATS2 = large tumour Suppressor Kinase 2, KLF2 = Kruppel-like factor 2, ADPGKAS1 = long noncoding RNA ADPGK-AS1, BAP1 = BRCA1 associated protein 1, ASXL2 = ASXL transcriptional regulator 2, Caco2 = human colorectal adenocarcinoma cells, SW1116 = colon cancer cell, LoVo = colorectal cancer cell, COADREAD = colon adenocarcinoma and rectum adenocarcinoma, BLCA = bladder urothelial carcinoma, BRCA = breast invasive carcinoma, PI3K = phosphoinositide 3-kinases, AKT = protein kinase B, mTOR = mammalian target of rapamycin.</span></div><div style='clear:both;'></div></div> </div><div class="html-table-wrap" id="biomolecules-12-00462-t002"> <div class="html-table_wrap_td" > <div class="html-tablepopup html-tablepopup-link" data-counterslinkmanual = "https://www.mdpi.com/2218-273X/12/3/462/display" href='#table_body_display_biomolecules-12-00462-t002'> <img alt="Table" data-lsrc="https://www.mdpi.com/img/table.png" /> <a class="html-expand html-tablepopup" data-counterslinkmanual = "https://www.mdpi.com/2218-273X/12/3/462/display" href="#table_body_display_biomolecules-12-00462-t002"></a> </div> </div> <div class="html-table_wrap_discription"> <b>Table 2.</b> Recent studies on LSD1/2 in liver cancer. </div> </div> <div class="html-table_show mfp-hide " id ="table_body_display_biomolecules-12-00462-t002" > <div class="html-caption" ><b>Table 2.</b> Recent studies on LSD1/2 in liver cancer.</div> <table > <thead ><tr ><th align='center' valign='middle' style='border-top:solid thin;border-bottom:solid thin' class='html-align-center' >LSD</th><th align='center' valign='middle' style='border-top:solid thin;border-bottom:solid thin' class='html-align-center' >Model</th><th align='center' valign='middle' style='border-top:solid thin;border-bottom:solid thin' class='html-align-center' >Main Findings</th><th align='center' valign='middle' style='border-top:solid thin;border-bottom:solid thin' class='html-align-center' >Reference</th></tr></thead><tbody ><tr ><td align='center' valign='middle' style='border-bottom:solid thin' class='html-align-center' >LSD1</td><td align='left' valign='middle' style='border-bottom:solid thin' class='html-align-left' >Clinical data from 188 primary HCC patients. Primary HCC cells, Male nude mice injected with tumour suspension for HCC tumour model.</td><td align='left' valign='middle' style='border-bottom:solid thin' class='html-align-left' >LSD1 expression is positively associated with LGR5 expression and poor survival in HCC patients.<br>Induction of LSD1 overexpression expands the pool of LGR5+ cells (cancer initiating cells), and drug resistance in HCC cells.<br>Depletion of LSD1 attenuates the self-renewal of CSCs and their drug resistance.<br>LSD1 reduces the H3K4me1/2 methylation at the promoters of several repressors of β-catenin signalling to enhance β-catenin activity in CSCs and enhances tumour formation</td><td align='center' valign='middle' style='border-bottom:solid thin' class='html-align-center' >[<a href="#B62-biomolecules-12-00462" class="html-bibr">62</a>]</td></tr><tr ><td align='center' valign='middle' style='border-bottom:solid thin' class='html-align-center' >LSD1</td><td align='left' valign='middle' style='border-bottom:solid thin' class='html-align-left' >Data from 303 HCC patients, Crispr/Cas9 for LSD1-KO SNU-423 and SNU-475 cell lines</td><td align='left' valign='middle' style='border-bottom:solid thin' class='html-align-left' >LSD1 expression is associated with poorer outcome for overall and disease-free survival for HCC. LSD1 knockout results in reduced S-phase population and it is involved in retinoic acid (RA) pathway.</td><td align='center' valign='middle' style='border-bottom:solid thin' class='html-align-center' >[<a href="#B64-biomolecules-12-00462" class="html-bibr">64</a>]</td></tr><tr ><td align='center' valign='middle' style='border-bottom:solid thin' class='html-align-center' >LSD1</td><td align='left' valign='middle' style='border-bottom:solid thin' class='html-align-left' >Human HCC cell lines (Huh7, HCC-LM3, HepG2, MHCC97H and Hep3B), the normal liver cell line (LO2), and OXA-resistant liver cancer cell lines, Clinical data from 153 HCC patients, xenograft HepG2 mice models</td><td align='left' valign='middle' style='border-bottom:solid thin' class='html-align-left' >LSD1 demethylates LINC01134 for its up-regulation and subsequently confers resistance against oxaliplatin in HCC cells.<br>LSD1 knockdown results in deregulation of LINC01134.<br>LSD1 expression is correlated with LINC01134 in HCC patients.</td><td align='center' valign='middle' style='border-bottom:solid thin' class='html-align-center' >[<a href="#B68-biomolecules-12-00462" class="html-bibr">68</a>]</td></tr><tr ><td align='center' valign='middle' style='border-bottom:solid thin' class='html-align-center' >LSD1</td><td align='left' valign='middle' style='border-bottom:solid thin' class='html-align-left' >Liver cancer Bel-7402 cells, xenograft mice models using Bel-7402 cells.</td><td align='left' valign='middle' style='border-bottom:solid thin' class='html-align-left' >Inhibition of LSD1 leads to attenuated migration of liver cancer cells and show potential antitumor activity in vivo.</td><td align='center' valign='middle' style='border-bottom:solid thin' class='html-align-center' >[<a href="#B71-biomolecules-12-00462" class="html-bibr">71</a>]</td></tr><tr ><td align='center' valign='middle' style='border-bottom:solid thin' class='html-align-center' >LSD1</td><td align='left' valign='middle' style='border-bottom:solid thin' class='html-align-left' >HCC TCGA dataset, HCC cell lines HuH7, Hep3B, HepG2, SK-Hep1, PLC/PRF/5 and FOCUS.</td><td align='left' valign='middle' style='border-bottom:solid thin' class='html-align-left' >Higher LSD1 expression is associated with poor survival in HCC.<br>LSD1 inhibitor exhibited poor effect on HCC cell survival.</td><td align='center' valign='middle' style='border-bottom:solid thin' class='html-align-center' >[<a href="#B72-biomolecules-12-00462" class="html-bibr">72</a>]</td></tr><tr ><td align='center' valign='middle' style='border-bottom:solid thin' class='html-align-center' >LSD1</td><td align='left' valign='middle' style='border-bottom:solid thin' class='html-align-left' >HCC cell lines (PLC/PRF/5 and Huh7), PLC and Huh7 sorafenib-resistant cell lines, mice transfected with sh-RNA (LSD1 and LSD2) containing stable clones of HCC cell lines</td><td align='left' valign='middle' style='border-bottom:solid thin' class='html-align-left' >LSD1 is critical for the induction of a stem-like population and inhibiting its activity attenuates stemness in sorafenib-resistant HCC cells.<br>LSD1 inhibitors derepress the transcription of Wnt antagonists and down-regulate β -catenin signalling activity in sorafenib-resistant cells and in vivo.</td><td align='center' valign='middle' style='border-bottom:solid thin' class='html-align-center' >[<a href="#B73-biomolecules-12-00462" class="html-bibr">73</a>]</td></tr><tr ><td align='center' valign='middle' style='border-bottom:solid thin' class='html-align-center' >LSD2</td><td align='left' valign='middle' style='border-bottom:solid thin' class='html-align-left' >HCC tissue samples, <span class='html-italic'>n</span> = 365.</td><td align='left' valign='middle' style='border-bottom:solid thin' class='html-align-left' >Higher expression of LSD2 is associated with a worse prognosis.</td><td align='center' valign='middle' style='border-bottom:solid thin' class='html-align-center' >[<a href="#B72-biomolecules-12-00462" class="html-bibr">72</a>]</td></tr><tr ><td align='center' valign='middle' style='border-bottom:solid thin' class='html-align-center' >LSD2</td><td align='left' valign='middle' style='border-bottom:solid thin' class='html-align-left' >Sorafenib resistant Huh7 Cell line.</td><td align='left' valign='middle' style='border-bottom:solid thin' class='html-align-left' >No change in the expression levels of LSD2. Depletion of LSD2 did not affect sensitivity to sorafenib.</td><td align='center' valign='middle' style='border-bottom:solid thin' class='html-align-center' >[<a href="#B73-biomolecules-12-00462" class="html-bibr">73</a>]</td></tr></tbody> </table> <div class='html-table_foot html-p'><div class='html-p' style='text-indent:0em;'><span class='html-fn-content'>Abbreviations: HCC = hepatocellular carcinoma, CSCs = cancer stem cells, siRNA = silencing RNA, OXA = oxaliplatin, LGR5 = leucine-rich repeat-containing G-protein coupled receptor 5.</span></div><div style='clear:both;'></div></div> </div><div class="html-table-wrap" id="biomolecules-12-00462-t003"> <div class="html-table_wrap_td" > <div class="html-tablepopup html-tablepopup-link" data-counterslinkmanual = "https://www.mdpi.com/2218-273X/12/3/462/display" href='#table_body_display_biomolecules-12-00462-t003'> <img alt="Table" data-lsrc="https://www.mdpi.com/img/table.png" /> <a class="html-expand html-tablepopup" data-counterslinkmanual = "https://www.mdpi.com/2218-273X/12/3/462/display" href="#table_body_display_biomolecules-12-00462-t003"></a> </div> </div> <div class="html-table_wrap_discription"> <b>Table 3.</b> Recent studies on LSD1/2 in pancreatic cancer. </div> </div> <div class="html-table_show mfp-hide " id ="table_body_display_biomolecules-12-00462-t003" > <div class="html-caption" ><b>Table 3.</b> Recent studies on LSD1/2 in pancreatic cancer.</div> <table > <thead ><tr ><th align='center' valign='middle' style='border-top:solid thin;border-bottom:solid thin' class='html-align-center' >LSD</th><th align='center' valign='middle' style='border-top:solid thin;border-bottom:solid thin' class='html-align-center' >Model</th><th align='center' valign='middle' style='border-top:solid thin;border-bottom:solid thin' class='html-align-center' >Main Findings</th><th align='center' valign='middle' style='border-top:solid thin;border-bottom:solid thin' class='html-align-center' >Reference</th></tr></thead><tbody ><tr ><td align='center' valign='middle' style='border-bottom:solid thin' class='html-align-center' >LSD1</td><td align='left' valign='middle' style='border-bottom:solid thin' class='html-align-left' >Gene Expression Omnibus data sets GSE15471.<br>Human pancreatic cancer and matched paracancerous tissue samples, <span class='html-italic'>n</span> = 28.<br>BxPC-3 and PANC-1 human pancreatic cancer cell lines.<br>Xenografts using BxPC-3 cells in BALB/C mice, <span class='html-italic'>n</span> = 12.</td><td align='left' valign='middle' style='border-bottom:solid thin' class='html-align-left' >lncRNA HOXA-AS2 promotes pancreatic cancer cell proliferation and reduces apoptosis.<br>HOXA-AS2 binds to LSD1 in lncRNA-HOXA-AS2/EZH2/LSD1 complex to exert its oncogenic functions.</td><td align='center' valign='middle' style='border-bottom:solid thin' class='html-align-center' >[<a href="#B74-biomolecules-12-00462" class="html-bibr">74</a>]</td></tr><tr ><td align='center' valign='middle' style='border-bottom:solid thin' class='html-align-center' >LSD1</td><td align='left' valign='middle' style='border-bottom:solid thin' class='html-align-left' >Gene Expression Omnibus data sets GSE15471, GSE15932, GSE16515.<br>Human pancreatic cancer tissue samples, <span class='html-italic'>n</span> = 48.<br>AsPC-1, BxPC-3, and PANC-1 human pancreatic cancer cell lines.<br>Xenografts using BxPC-3 cells in BALB/c mice, <span class='html-italic'>n</span> = 10.</td><td align='left' valign='middle' style='border-bottom:solid thin' class='html-align-left' >lncRNA DUXAP10 promotes pancreatic cancer cells, reduces apoptosis, and is associated with poor prognosis.<br>DUXAP10 correlates and binds to LSD1.</td><td align='center' valign='middle' style='border-bottom:solid thin' class='html-align-center' >[<a href="#B75-biomolecules-12-00462" class="html-bibr">75</a>]</td></tr><tr ><td align='center' valign='middle' style='border-bottom:solid thin' class='html-align-center' >LSD2</td><td align='left' valign='middle' style='border-bottom:solid thin' class='html-align-left' >Human pancreatic cancer and matched paracancerous tissue samples, <span class='html-italic'>n</span> = 20.<br>BxPC-3, CFPAC-1, PANC-1, SW1990 human pancreatic cancer cell lines, and HPDE6-C7 normal human pancreatic duct epithelial cell line.</td><td align='left' valign='middle' style='border-bottom:solid thin' class='html-align-left' >LSD2 is highly expressed in pancreatic cancer.<br>LSD2 promotes pancreatic cancer cell proliferation and reduces apoptosis.<br>LSD2 knockdown upregulates phosphorylation of ERK1/2, Smad2, p53, cleaved PARP, cleaved Caspase-3, cleaved Caspase-7, eIF2a and Survivin.</td><td align='center' valign='middle' style='border-bottom:solid thin' class='html-align-center' >[<a href="#B76-biomolecules-12-00462" class="html-bibr">76</a>]</td></tr></tbody> </table> <div class='html-table_foot html-p'><div class='html-p' style='text-indent:0em;'><span class='html-fn-content'>Abbreviations: lncRNA = long noncoding RNA.</span></div><div style='clear:both;'></div></div> </div><div class="html-table-wrap" id="biomolecules-12-00462-t004"> <div class="html-table_wrap_td" > <div class="html-tablepopup html-tablepopup-link" data-counterslinkmanual = "https://www.mdpi.com/2218-273X/12/3/462/display" href='#table_body_display_biomolecules-12-00462-t004'> <img alt="Table" data-lsrc="https://www.mdpi.com/img/table.png" /> <a class="html-expand html-tablepopup" data-counterslinkmanual = "https://www.mdpi.com/2218-273X/12/3/462/display" href="#table_body_display_biomolecules-12-00462-t004"></a> </div> </div> <div class="html-table_wrap_discription"> <b>Table 4.</b> Recent studies on LSD1/2 in colorectal cancer. </div> </div> <div class="html-table_show mfp-hide " id ="table_body_display_biomolecules-12-00462-t004" > <div class="html-caption" ><b>Table 4.</b> Recent studies on LSD1/2 in colorectal cancer.</div> <table > <thead ><tr ><th align='center' valign='middle' style='border-top:solid thin;border-bottom:solid thin' class='html-align-center' >LSD</th><th align='center' valign='middle' style='border-top:solid thin;border-bottom:solid thin' class='html-align-center' >Model</th><th align='center' valign='middle' style='border-top:solid thin;border-bottom:solid thin' class='html-align-center' >Main Findings</th><th align='center' valign='middle' style='border-top:solid thin;border-bottom:solid thin' class='html-align-center' >Reference</th></tr></thead><tbody ><tr ><td align='center' valign='middle' style='border-bottom:solid thin' class='html-align-center' >LSD1</td><td align='left' valign='middle' style='border-bottom:solid thin' class='html-align-left' >SW620 human CRC cell line.<br>Xenografts using SW620 cells in BALB/c mice, <span class='html-italic'>n</span> = 24.</td><td align='left' valign='middle' style='border-bottom:solid thin' class='html-align-left' >LSD1 is upregulated in cells presenting cancer stem cell marker CD133.<br>LSD1 KD impairs the stemness of CD133+ cells, decreasing cell viability, colony formation rate, migration, and invasion.</td><td align='center' valign='middle' style='border-bottom:solid thin' class='html-align-center' >[<a href="#B77-biomolecules-12-00462" class="html-bibr">77</a>]</td></tr><tr ><td align='center' valign='middle' style='border-bottom:solid thin' class='html-align-center' >LSD1</td><td align='left' valign='middle' style='border-bottom:solid thin' class='html-align-left' >SW620 and HT-29 human CRC cell lines.</td><td align='left' valign='middle' style='border-bottom:solid thin' class='html-align-left' >CABYR, FOX2, TLE4 and CDH1 are 4 key LSD-1 target genes associated with proliferation, metastasis, and invasion.<br>LSD1 downregulates CABYR expression by decreasing H3K4me1/2 and downregulates CDH1 by decreasing H3K4me2.<br>LSD1 knockdown affects most frequently p53 pathway.<br>LSD1 affects IG-1/mTOR pathway.</td><td align='center' valign='middle' style='border-bottom:solid thin' class='html-align-center' >[<a href="#B78-biomolecules-12-00462" class="html-bibr">78</a>]</td></tr><tr ><td align='center' valign='middle' style='border-bottom:solid thin' class='html-align-center' >LSD1</td><td align='left' valign='middle' style='border-bottom:solid thin' class='html-align-left' >Gene Expression Omnibus data set GSE167262.<br>HT-29, LSD-174T, NCI-H508 human CRC cell lines.<br>Normal human organoids derived from the ascending colon.<br>Colon cancer organoides derived from patient-derived xenografts models 519858 162-T and 817829 284-R.</td><td align='left' valign='middle' style='border-bottom:solid thin' class='html-align-left' >BRAF mutation is associated with poorly differentiated enteroendocrine cells.<br>LSD1 is upregulated in early secretory cells and early enteroendocrine cells.<br>LSD1 KD results in loss of secretory cells.<br>LSD1 KD reduces TFF3 expression.<br>LSD1 KD leads to loss of pS473-AKT and abrogates tumour growth and metastasis.</td><td align='center' valign='middle' style='border-bottom:solid thin' class='html-align-center' >[<a href="#B79-biomolecules-12-00462" class="html-bibr">79</a>]</td></tr><tr ><td align='center' valign='middle' style='border-bottom:solid thin' class='html-align-center' >LSD1</td><td align='left' valign='middle' style='border-bottom:solid thin' class='html-align-left' >CRC tissue samples, <span class='html-italic'>n</span> =50.</td><td align='left' valign='middle' style='border-bottom:solid thin' class='html-align-left' >Loss of LSD1 is associated with metastasis and higher TNM stages.</td><td align='center' valign='middle' style='border-bottom:solid thin' class='html-align-center' >[<a href="#B80-biomolecules-12-00462" class="html-bibr">80</a>]</td></tr><tr ><td align='center' valign='middle' style='border-bottom:solid thin' class='html-align-center' >LSD1</td><td align='left' valign='middle' style='border-bottom:solid thin' class='html-align-left' >CRC tissue samples, <span class='html-italic'>n</span> = 207.</td><td align='left' valign='middle' style='border-bottom:solid thin' class='html-align-left' >LSD1 is associated with lower TNM stages.<br>LSD1 low expression is associated with lower disease-specific and disease-free survival.</td><td align='center' valign='middle' style='border-bottom:solid thin' class='html-align-center' >[<a href="#B81-biomolecules-12-00462" class="html-bibr">81</a>]</td></tr><tr ><td align='center' valign='middle' style='border-bottom:solid thin' class='html-align-center' >LSD1</td><td align='left' valign='middle' style='border-bottom:solid thin' class='html-align-left' >HT-29, SW480, HCT116, LoVo, and RKO human CRC cell lines.<br>AGS human gastric cancer cell line.</td><td align='left' valign='middle' style='border-bottom:solid thin' class='html-align-left' >LSD1 is upregulated in PIK3CA mutant CRC compared to PIK3CA wt CRC.<br>LSD1 increases pS473-AKT by scaffolding the CoREST complex.<br>LSD1 enhances EMT-associated gene programmes in PIK3CA mutant cells.<br>LSD1 regulates protein stability of Snail by regulating AKT.<br>LSD1 is required for EGF induced migration mediated by AKT-GSK3β-Snail pathway.</td><td align='center' valign='middle' style='border-bottom:solid thin' class='html-align-center' >[<a href="#B82-biomolecules-12-00462" class="html-bibr">82</a>]</td></tr><tr ><td align='center' valign='middle' style='border-bottom:solid thin' class='html-align-center' >LSD1</td><td align='left' valign='middle' style='border-bottom:solid thin' class='html-align-left' >HCT116 human CRC cell line.</td><td align='left' valign='middle' style='border-bottom:solid thin' class='html-align-left' >RIOK1 promotes CRC cell proliferation and migration through PI3K/AKT pathway.<br>LSD1 demethylates RIOK1 stabilizing it.</td><td align='center' valign='middle' style='border-bottom:solid thin' class='html-align-center' >[<a href="#B83-biomolecules-12-00462" class="html-bibr">83</a>]</td></tr><tr ><td align='center' valign='middle' style='border-bottom:solid thin' class='html-align-center' >LSD1</td><td align='left' valign='middle' style='border-bottom:solid thin' class='html-align-left' >HCT116 and SW48 human CRC cell lines.<br>HEK293T human embryonic kidney cell line.</td><td align='left' valign='middle' style='border-bottom:solid thin' class='html-align-left' >USP38 binds and deubiquitinase LSD1, enhancing the activity of the signalling pathways activated by LSD1.</td><td align='center' valign='middle' style='border-bottom:solid thin' class='html-align-center' >[<a href="#B84-biomolecules-12-00462" class="html-bibr">84</a>]</td></tr><tr ><td align='center' valign='middle' style='border-bottom:solid thin' class='html-align-center' >LSD1</td><td align='left' valign='middle' style='border-bottom:solid thin' class='html-align-left' >Tissue microarray containing 100 human CRC cases.<br>HT-29 and HCT116 human CRC cell lines.</td><td align='left' valign='middle' style='border-bottom:solid thin' class='html-align-left' >TNC expression is associated with poor clinical outcomes, proliferation, and migration.<br>TNC is positively correlated with the LSD1 protein in CRC.<br>TNC KD decreases LSD1 expression.</td><td align='center' valign='middle' style='border-bottom:solid thin' class='html-align-center' >[<a href="#B85-biomolecules-12-00462" class="html-bibr">85</a>]</td></tr><tr ><td align='center' valign='middle' style='border-bottom:solid thin' class='html-align-center' >LSD1</td><td align='left' valign='middle' style='border-bottom:solid thin' class='html-align-left' >SW620, SW480, DLD-1, HTC116, and HT-29 human CRC cell lines.<br>NCM460 normal human colon epithelial cell line.<br>HEK293T human embryonic kidney cell line.</td><td align='left' valign='middle' style='border-bottom:solid thin' class='html-align-left' >LSD1 and TSPAN8 are overexpressed in CRC.<br>LSD1 upregulates TSPAN8 expression by reducing H3K9me2 occupancy on TSPAN8 promoter.<br>TSPAN8 enhances tumorigenicity and EMT in CRC cells in an LSD-1 dependent manner.<br>LSD1 and TSPAN8 KD results in an upregulation of E-cadherin and ZO-1, and a downregulation of <span class='html-small-caps'>n</span>-cadherin, Vimentin, Slug and Snail.</td><td align='center' valign='middle' style='border-bottom:solid thin' class='html-align-center' >[<a href="#B86-biomolecules-12-00462" class="html-bibr">86</a>]</td></tr><tr ><td align='center' valign='middle' style='border-bottom:solid thin' class='html-align-center' >LSD1</td><td align='left' valign='middle' style='border-bottom:solid thin' class='html-align-left' >HCT116 human CRC cell line.<br>HeLa human cervical cancer cell line.</td><td align='left' valign='middle' style='border-bottom:solid thin' class='html-align-left' >LSD1 inhibition modifies the lipidome of cancer cells, specially it dysregulates sphingolipids and glycolipids.<br>LSD1 inhibition enhances bioactive lipids such as ceramides and sphingomyelin which are involved in signalling pathways such as apoptosis.</td><td align='center' valign='middle' style='border-bottom:solid thin' class='html-align-center' >[<a href="#B87-biomolecules-12-00462" class="html-bibr">87</a>]</td></tr><tr ><td align='center' valign='middle' style='border-bottom:solid thin' class='html-align-center' >LSD1</td><td align='left' valign='middle' style='border-bottom:solid thin' class='html-align-left' >CRC tissue samples, <span class='html-italic'>n</span> = 58.<br>DLD-1, HCT116, SW480, and SW620 human CRC cell lines.</td><td align='left' valign='middle' style='border-bottom:solid thin' class='html-align-left' >lncRNA DUXAP10 is positively associated with CRC cell proliferation, tumour size, advanced TNM stages and lymph node metastasis.<br>LSD1 interacts with DUXAP10 and decreases p21 and PTEN expression.</td><td align='center' valign='middle' style='border-bottom:solid thin' class='html-align-center' >[<a href="#B88-biomolecules-12-00462" class="html-bibr">88</a>]</td></tr><tr ><td align='center' valign='middle' style='border-bottom:solid thin' class='html-align-center' >LSD1</td><td align='left' valign='middle' style='border-bottom:solid thin' class='html-align-left' >Human CRC and matched paracancerous tissue samples.<br>DLD-1 and SW480 human colorectal cancer cell lines.</td><td align='left' valign='middle' style='border-bottom:solid thin' class='html-align-left' >lncRNA DUXAP8 is positively associated with CRC cell proliferation, tumour size, and advanced TNM stages.<br>LSD1 interacts with DUXAP8 and promotes CRC cell proliferation.</td><td align='center' valign='middle' style='border-bottom:solid thin' class='html-align-center' >[<a href="#B89-biomolecules-12-00462" class="html-bibr">89</a>]</td></tr><tr ><td align='center' valign='middle' style='border-bottom:solid thin' class='html-align-center' >LSD1</td><td align='left' valign='middle' style='border-bottom:solid thin' class='html-align-left' >Human CRC and matched paracancerous tissue samples, <span class='html-italic'>n</span> = 60.<br>HT-29, HCT116, SW480 and DLD-1 human colorectal cancer tissue samples.<br>NCM460 human colon epithelial normal cells.</td><td align='left' valign='middle' style='border-bottom:solid thin' class='html-align-left' >lncRNA ZEB2-AS1 is associated with increased proliferation rate, tumour size, higher TNM stage and lymph node metastasis.<br>LSD1 interacts with ZEB-AS1 promoting cell proliferation.</td><td align='center' valign='middle' style='border-bottom:solid thin' class='html-align-center' >[<a href="#B90-biomolecules-12-00462" class="html-bibr">90</a>]</td></tr><tr ><td align='center' valign='middle' style='border-bottom:solid thin' class='html-align-center' >LSD1</td><td align='left' valign='middle' style='border-bottom:solid thin' class='html-align-left' >Human CRC and matched paracancerous tissue samples, <span class='html-italic'>n</span> = 69.<br>HCT116, DLD-1, SW480, SW620, HT-29, and LoVo human CRC cell lines.</td><td align='left' valign='middle' style='border-bottom:solid thin' class='html-align-left' >lncRNA HOXA-AS2 is associated with increased proliferation rate, tumour size, higher TNM stage and lymph node metastasis.<br>LSD1 interacts with HOXA-AS2 silencing p21 and KLF2 transcription and promotes cell proliferation.</td><td align='center' valign='middle' style='border-bottom:solid thin' class='html-align-center' >[<a href="#B91-biomolecules-12-00462" class="html-bibr">91</a>]</td></tr><tr ><td align='center' valign='middle' style='border-bottom:solid thin' class='html-align-center' >LSD1</td><td align='left' valign='middle' style='border-bottom:solid thin' class='html-align-left' >Human CRC and matched paracancerous tissue samples, <span class='html-italic'>n</span> = 98.<br>LoVo and HCT116 human CRC cell lines.</td><td align='left' valign='middle' style='border-bottom:solid thin' class='html-align-left' >miR-137-3p is negatively associated with the invasiveness of CRC cells.<br>LSD1 is regulated by miR-137-3p and is involved in CRC cell proliferation, adhesion, and invasion.<br>LSD1 and miR-137-3p respond to hypoxia.</td><td align='center' valign='middle' style='border-bottom:solid thin' class='html-align-center' >[<a href="#B92-biomolecules-12-00462" class="html-bibr">92</a>]</td></tr><tr ><td align='center' valign='middle' style='border-bottom:solid thin' class='html-align-center' >LSD2</td><td align='left' valign='middle' style='border-bottom:solid thin' class='html-align-left' >LoVo, HCT116, SW1116, andCaco2 human CRC cell lines.<br>Xenografts assays using LoVo cells in BALB/c mice, <span class='html-italic'>n</span> = 6.</td><td align='left' valign='middle' style='border-bottom:solid thin' class='html-align-left' >LSD2 is upregulated in CRC.<br>LSD2 reduces Bcl-2 and increases cleaved caspase 3, cleaved caspase 9 and BAX levels.<br>LSD2 downregulates p53 expression and p21 and drives the cell cycle through p53-p21-Rb.</td><td align='center' valign='middle' style='border-bottom:solid thin' class='html-align-center' >[<a href="#B44-biomolecules-12-00462" class="html-bibr">44</a>]</td></tr></tbody> </table> <div class='html-table_foot html-p'><div class='html-p' style='text-indent:0em;'><span class='html-fn-content'>Abbreviations: CRC = colorectal cancer, KD = knockdown, wt = Wildtype, EMT = epithelial-mesenchymal transition, TNC = tenascin-C, lncRNA = long noncoding RNA.</span></div><div style='clear:both;'></div></div> </div></section><section class='html-fn_group'><table><tr id=''><td></td><td><div class='html-p'><b>Publisher’s Note:</b> MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations.</div></td></tr></table></section> <section id="html-copyright"><br>© 2022 by the authors. 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The Role of LSD1 and LSD2 in Cancers of the Gastrointestinal System: An Update. <em>Biomolecules</em> <b>2022</b>, <em>12</em>, 462. https://doi.org/10.3390/biom12030462 </p> <div style="display: block"> <b>AMA Style</b><br> <p> Malagraba G, Yarmohammadi M, Javed A, Barceló C, Rubio-Tomás T. The Role of LSD1 and LSD2 in Cancers of the Gastrointestinal System: An Update. <em>Biomolecules</em>. 2022; 12(3):462. https://doi.org/10.3390/biom12030462 </p> <b>Chicago/Turabian Style</b><br> <p> Malagraba, Gianluca, Mahdieh Yarmohammadi, Aadil Javed, Carles Barceló, and Teresa Rubio-Tomás. 2022. "The Role of LSD1 and LSD2 in Cancers of the Gastrointestinal System: An Update" <em>Biomolecules</em> 12, no. 3: 462. https://doi.org/10.3390/biom12030462 </p> <b>APA Style</b><br> <p> Malagraba, G., Yarmohammadi, M., Javed, A., Barceló, C., & Rubio-Tomás, T. (2022). 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