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Epipharyngeal Abrasive Therapy Down-regulates the Expression of SARS-CoV-2 Entry Factors ACE2 and TMPRSS2 | In Vivo
<!DOCTYPE html> <html lang="en" dir="ltr" xmlns="http://www.w3.org/1999/xhtml" xmlns:mml="http://www.w3.org/1998/Math/MathML"> <head prefix="og: http://ogp.me/ns# article: http://ogp.me/ns/article# book: http://ogp.me/ns/book#" > <!--[if IE]><![endif]--> <link rel="dns-prefetch" href="//cdn.jsdelivr.net" /> <link rel="dns-prefetch" href="//cdn.foxycart.com" /> <link rel="dns-prefetch" href="//scholar.google.com" /> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <meta name="Generator" content="Drupal 7 (http://drupal.org)" /> <link rel="canonical" href="https://iv.iiarjournals.org/content/36/1/371" /> <link rel="alternate" type="application/pdf" title="Full Text (PDF)" href="/content/36/1/371.full.pdf" /> <link rel="alternate" type="text/plain" title="Full Text (Plain)" href="/content/36/1/371.full.txt" /> <link rel="alternate" type="application/vnd.ms-powerpoint" title="Powerpoint" href="/content/36/1/371.ppt" /> <meta name="type" content="article" /> <meta name="category" content="research-article" /> <meta name="HW.identifier" content="/invivo/36/1/371.atom" /> <meta name="HW.pisa" content="invivo;36/1/371" /> <meta name="DC.Format" content="text/html" /> <meta name="DC.Language" content="en" /> <meta name="DC.Title" content="Epipharyngeal Abrasive Therapy Down-regulates the Expression of SARS-CoV-2 Entry Factors ACE2 and TMPRSS2" /> <meta name="DC.Identifier" content="10.21873/invivo.12712" /> <meta name="DC.Date" content="2022-01-01" /> <meta name="DC.Publisher" content="International Institute of Anticancer Research" /> <meta name="DC.Rights" content="Copyright © 2022 International Institute of Anticancer Research (Dr. George J. Delinasios), All rights reserved" /> <meta name="DC.AccessRights" content="restricted" /> <meta name="DC.Description" content="Background: The epipharynx, with its high expression of Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) entry factors angiotensin-converting enzyme 2 (ACE2) and transmembrane protease, serine 2 (TMPRSS2), is a primary target for SARS-CoV-2 replication in the early stage of Coronavirus Disease 19 (COVID-19). Epipharyngeal abrasive therapy (EAT) is a treatment for epipharyngitis in Japan which involves applying zinc chloride to the epipharyngeal mucosa. In this study, we evaluated the expression patterns of ACE2 and TMPRSS2 in tissue samples from patients before and after EAT. Patients and Methods: The study subjects were seven patients that had not been treated with EAT and 11 patients that had. For immunohistochemical assessment of the epipharyngeal mucosa, the staining intensity of ACE2 and TMPRSS2 was described as an immunohistochemical score (IHC score). Results: The IHC scores for ACE2 and TEMPRSS2 in the EAT-treated group were 3.40-fold and 1.81-fold lower, respectively, than those in the non-treated group (p=0.0208 and p=0.0244, respectively). Conclusion: EAT down-regulates the expression of SARS-CoV-2 entry factors ACE2 and TMPRSS2. Thus, EAT has potential as a novel COVID-19 preventative method." /> <meta name="DC.Contributor" content="KENSUKE NISHI" /> <meta name="DC.Contributor" content="SHOHEI YOSHIMOTO" /> <meta name="DC.Contributor" content="SOICHIRO NISHI" /> <meta name="DC.Contributor" content="TOSHIYUKI TSUNODA" /> <meta name="DC.Contributor" content="JUN OHNO" /> <meta name="DC.Contributor" content="MICHINOBU YOSHIMURA" /> <meta name="DC.Contributor" content="KENJI HIROMATSU" /> <meta name="DC.Contributor" content="TAKAFUMI YAMANO" /> <meta name="article:published_time" content="2022-01-01" /> <meta name="article:section" content="Clinical Studies" /> <meta name="citation_title" content="Epipharyngeal Abrasive Therapy Down-regulates the Expression of SARS-CoV-2 Entry Factors ACE2 and TMPRSS2" /> <meta name="citation_abstract" lang="en" content="<p>Background: The epipharynx, with its high expression of Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) entry factors angiotensin-converting enzyme 2 (ACE2) and transmembrane protease, serine 2 (TMPRSS2), is a primary target for SARS-CoV-2 replication in the early stage of Coronavirus Disease 19 (COVID-19). Epipharyngeal abrasive therapy (EAT) is a treatment for epipharyngitis in Japan which involves applying zinc chloride to the epipharyngeal mucosa. In this study, we evaluated the expression patterns of ACE2 and TMPRSS2 in tissue samples from patients before and after EAT. Patients and Methods: The study subjects were seven patients that had not been treated with EAT and 11 patients that had. For immunohistochemical assessment of the epipharyngeal mucosa, the staining intensity of ACE2 and TMPRSS2 was described as an immunohistochemical score (IHC score). Results: The IHC scores for ACE2 and TEMPRSS2 in the EAT-treated group were 3.40-fold and 1.81-fold lower, respectively, than those in the non-treated group (p=0.0208 and p=0.0244, respectively). Conclusion: EAT down-regulates the expression of SARS-CoV-2 entry factors ACE2 and TMPRSS2. Thus, EAT has potential as a novel COVID-19 preventative method.</p>" /> <meta name="citation_journal_title" content="In Vivo" /> <meta name="citation_publisher" content="International Institute of Anticancer Research" /> <meta name="citation_publication_date" content="2022/01/01" /> <meta name="citation_mjid" content="invivo;36/1/371" /> <meta name="citation_id" content="36/1/371" /> <meta name="citation_public_url" content="https://iv.iiarjournals.org/content/36/1/371" /> <meta name="citation_abstract_html_url" content="https://iv.iiarjournals.org/content/36/1/371.abstract" /> <meta name="citation_full_html_url" content="https://iv.iiarjournals.org/content/36/1/371.full" /> <meta name="citation_pdf_url" content="https://iv.iiarjournals.org/content/invivo/36/1/371.full.pdf" /> <meta name="citation_issn" content="0258-851X" /> <meta name="citation_issn" content="1791-7549" /> <meta name="citation_doi" content="10.21873/invivo.12712" /> <meta name="citation_pmid" content="34972736" /> <meta name="citation_volume" content="36" /> <meta name="citation_issue" content="1" /> <meta name="citation_article_type" content="Research Article" /> <meta name="citation_section" content="Clinical Studies" /> <meta name="citation_firstpage" content="371" /> <meta name="citation_lastpage" content="374" /> <meta name="citation_author" content="KENSUKE NISHI" /> <meta name="citation_author_institution" content="Section of Otolaryngology, Department of Medicine, Fukuoka Dental College, Fukuoka, Japan;" /> <meta name="citation_author_institution" content="Nishi Otolaryngology Clinic, Fukuoka, Japan;" /> <meta name="citation_author_email" content="knishi@college.fdcnet.ac.jp" /> <meta name="citation_author" content="SHOHEI YOSHIMOTO" /> <meta name="citation_author_institution" content="Section of Pathology, Department of Morphological Biology, Division of Biomedical Sciences, Fukuoka Dental College, Fukuoka, Japan;" /> <meta name="citation_author" content="SOICHIRO NISHI" /> <meta name="citation_author_institution" content="Nishi Otolaryngology Clinic, Fukuoka, Japan;" /> <meta name="citation_author" content="TOSHIYUKI TSUNODA" /> <meta name="citation_author_institution" content="Department of Cell Biology, Faculty of Medicine, Fukuoka University, Fukuoka, Japan;" /> <meta name="citation_author" content="JUN OHNO" /> <meta name="citation_author_institution" content="Research Center for Regenerative Medicine, Fukuoka Dental College, Fukuoka, Japan;" /> <meta name="citation_author" content="MICHINOBU YOSHIMURA" /> <meta name="citation_author_institution" content="Department of Microbiology and Immunology, Faculty of Medicine, Fukuoka University, Fukuoka, Japan" /> <meta name="citation_author" content="KENJI HIROMATSU" /> <meta name="citation_author_institution" content="Department of Microbiology and Immunology, Faculty of Medicine, Fukuoka University, Fukuoka, Japan" /> <meta name="citation_author" content="TAKAFUMI YAMANO" /> <meta name="citation_author_institution" content="Section of Otolaryngology, Department of Medicine, Fukuoka Dental College, Fukuoka, Japan;" /> <meta name="citation_reference" content="citation_journal_title=Nat Med;citation_author=W. 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Epipharyngeal abrasive therapy (EAT) is a treatment for epipharyngitis in Japan which involves applying zinc chloride to the epipharyngeal mucosa. In this study, we evaluated the expression patterns of ACE2 and TMPRSS2 in tissue samples from patients before and after EAT. Patients and Methods: The study subjects were seven patients that had not been treated with EAT and 11 patients that had. For immunohistochemical assessment of the epipharyngeal mucosa, the staining intensity of ACE2 and TMPRSS2 was described as an immunohistochemical score (IHC score). Results: The IHC scores for ACE2 and TEMPRSS2 in the EAT-treated group were 3.40-fold and 1.81-fold lower, respectively, than those in the non-treated group (p=0.0208 and p=0.0244, respectively). Conclusion: EAT down-regulates the expression of SARS-CoV-2 entry factors ACE2 and TMPRSS2. Thus, EAT has potential as a novel COVID-19 preventative method." /> <meta name="og-title" property="og:title" content="Epipharyngeal Abrasive Therapy Down-regulates the Expression of SARS-CoV-2 Entry Factors ACE2 and TMPRSS2" /> <meta name="og-url" property="og:url" content="https://iv.iiarjournals.org/content/36/1/371" /> <meta name="og-site-name" property="og:site_name" content="In Vivo" /> <meta name="og-description" property="og:description" content="Background: The epipharynx, with its high expression of Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) entry factors angiotensin-converting enzyme 2 (ACE2) and transmembrane protease, serine 2 (TMPRSS2), is a primary target for SARS-CoV-2 replication in the early stage of Coronavirus Disease 19 (COVID-19). Epipharyngeal abrasive therapy (EAT) is a treatment for epipharyngitis in Japan which involves applying zinc chloride to the epipharyngeal mucosa. In this study, we evaluated the expression patterns of ACE2 and TMPRSS2 in tissue samples from patients before and after EAT. Patients and Methods: The study subjects were seven patients that had not been treated with EAT and 11 patients that had. For immunohistochemical assessment of the epipharyngeal mucosa, the staining intensity of ACE2 and TMPRSS2 was described as an immunohistochemical score (IHC score). Results: The IHC scores for ACE2 and TEMPRSS2 in the EAT-treated group were 3.40-fold and 1.81-fold lower, respectively, than those in the non-treated group (p=0.0208 and p=0.0244, respectively). Conclusion: EAT down-regulates the expression of SARS-CoV-2 entry factors ACE2 and TMPRSS2. Thus, EAT has potential as a novel COVID-19 preventative method." /> <meta name="og-type" property="og:type" content="article" /> <meta name="og-image" property="og:image" content="" /> <link rel="shortlink" href="/node/17343" /> <link rel="shortcut icon" href="https://iv.iiarjournals.org/sites/default/files/images/favicon.ico" type="image/vnd.microsoft.icon" /> <meta name="viewport" content="width=device-width, initial-scale=1" /> <title>Epipharyngeal Abrasive Therapy Down-regulates the Expression of SARS-CoV-2 Entry Factors ACE2 and TMPRSS2 | In Vivo</title> <link type="text/css" rel="stylesheet" href="/sites/default/files/advagg_css/css__QEy_BpbtMcsqv3xURK855GSs2fFjOibU10yA758Mn4c__NucWi_bEk5E3BNVDtTt2nhiPtE1A5I24YwRDQ2fojJ0__Rs2GEYmP0L-hXq7rNwDXFD0Z27L-HjrDbJtyezzkbZw.css" media="all" /> <link type="text/css" rel="stylesheet" href="//cdn.jsdelivr.net/qtip2/2.2.1/jquery.qtip.min.css" media="all" /> <link type="text/css" rel="stylesheet" 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highwire-cite-highwire-article highwire-citation-jcore-article-title-complete clearfix has-author-tooltip highwire-citation-highwire-article-top-a"> <div class="highwire-cite-overline"><span class="highwire-cite-metadata-article-type highwire-cite-metadata">Research Article</span><span class="separator-pipe"></span><span class="highwire-cite-metadata-art-cat highwire-cite-metadata"><span class="wrapper">Clinical Studies</span></span></div> <div class="highwire-cite-access"><span class="highwire-citation-access highwire-citation-access-check" data-pisa-id="invivo;36/1/371" data-atom-uri="/invivo/36/1/371.atom" data-request-view="full"></span></div> <h1 class="highwire-cite-title" id="page-title">Epipharyngeal Abrasive Therapy Down-regulates the Expression of SARS-CoV-2 Entry Factors ACE2 and TMPRSS2</h1> <div class="highwire-cite-authors"><span class="highwire-citation-authors"><span class="highwire-citation-author first" data-delta="0">KENSUKE NISHI</span>, <span class="highwire-citation-author" data-delta="1">SHOHEI YOSHIMOTO</span>, <span class="highwire-citation-author" data-delta="2">SOICHIRO NISHI</span>, <span class="highwire-citation-author" data-delta="3">TOSHIYUKI TSUNODA</span>, <span class="highwire-citation-author" data-delta="4">JUN OHNO</span>, <span class="highwire-citation-author" data-delta="5">MICHINOBU YOSHIMURA</span>, <span class="highwire-citation-author" data-delta="6">KENJI HIROMATSU</span> and <span class="highwire-citation-author" data-delta="7">TAKAFUMI YAMANO</span></span></div> <div class="highwire-cite-metadata"><span class="highwire-cite-metadata-journal highwire-cite-metadata">In Vivo </span><span class="highwire-cite-metadata-date highwire-cite-metadata">January 2022, </span><span class="highwire-cite-metadata-volume highwire-cite-metadata">36 </span><span class="highwire-cite-metadata-issue highwire-cite-metadata">(1) </span><span class="highwire-cite-metadata-pages highwire-cite-metadata">371-374; </span><span class="highwire-cite-metadata-doi highwire-cite-metadata">DOI: https://doi.org/10.21873/invivo.12712 </span></div> <div class="highwire-cite-extras"><span class="highwire-foxycart-add-to-cart-ahah highwire-foxycart-add-to-cart-ahah" data-text="Add to Cart (%short-price)" data-apath="/invivo/36/1/371.atom" data-type="link" data-font-icon="" data-parent-id="17317"></span></div> </div> <div id="hw-article-author-popups-top-node-17343--6239577483" style="display: none;"><div class="author-tooltip-0"><div class="author-tooltip-name">KENSUKE NISHI </div><div class="author-tooltip-affiliation"><span class="author-tooltip-text"><div class='author-affiliation'><span class='nlm-sup'>1</span>Section of Otolaryngology, Department of Medicine, Fukuoka Dental College, Fukuoka, Japan;</div><div class='author-affiliation'><span class='nlm-sup'>2</span>Nishi Otolaryngology Clinic, Fukuoka, Japan;</div></span></div><ul class="author-tooltip-find-more"><li class="author-tooltip-gs-link first"><a href="/lookup/google-scholar?link_type=googlescholar&gs_type=author&author%5B0%5D=KENSUKE%2BNISHI%2B" target="_blank" class="" data-icon-position="" data-hide-link-title="0">Find this author on Google Scholar</a></li><li class="author-tooltip-pubmed-link"><a href="/lookup/external-ref?access_num=NISHI%20K&link_type=AUTHORSEARCH" target="_blank" class="" data-icon-position="" data-hide-link-title="0">Find this author on PubMed</a></li><li class="author-site-search-link"><a href="/search/author1%3AKENSUKE%2BNISHI%2B" rel="nofollow" class="" data-icon-position="" data-hide-link-title="0">Search for this author on this site</a></li><li class="author-corresp-email-link last"><span>For correspondence: <a href="mailto:knishi@college.fdcnet.ac.jp" class="" data-icon-position="" data-hide-link-title="0">knishi@college.fdcnet.ac.jp</a></span></li></ul></div><div class="author-tooltip-1"><div class="author-tooltip-name">SHOHEI YOSHIMOTO </div><div class="author-tooltip-affiliation"><span class="author-tooltip-text"><div class='author-affiliation'><span class='nlm-sup'>3</span>Section of Pathology, Department of Morphological Biology, Division of Biomedical Sciences, Fukuoka Dental College, Fukuoka, Japan;</div></span></div><ul class="author-tooltip-find-more"><li class="author-tooltip-gs-link first"><a href="/lookup/google-scholar?link_type=googlescholar&gs_type=author&author%5B0%5D=SHOHEI%2BYOSHIMOTO%2B" target="_blank" class="" data-icon-position="" data-hide-link-title="0">Find this author on Google Scholar</a></li><li class="author-tooltip-pubmed-link"><a href="/lookup/external-ref?access_num=YOSHIMOTO%20S&link_type=AUTHORSEARCH" target="_blank" class="" data-icon-position="" data-hide-link-title="0">Find this author on PubMed</a></li><li class="author-site-search-link last"><a href="/search/author1%3ASHOHEI%2BYOSHIMOTO%2B" rel="nofollow" class="" data-icon-position="" data-hide-link-title="0">Search for this author on this site</a></li></ul></div><div class="author-tooltip-2"><div class="author-tooltip-name">SOICHIRO NISHI </div><div class="author-tooltip-affiliation"><span class="author-tooltip-text"><div class='author-affiliation'><span class='nlm-sup'>2</span>Nishi Otolaryngology Clinic, Fukuoka, Japan;</div></span></div><ul class="author-tooltip-find-more"><li class="author-tooltip-gs-link first"><a href="/lookup/google-scholar?link_type=googlescholar&gs_type=author&author%5B0%5D=SOICHIRO%2BNISHI%2B" target="_blank" class="" data-icon-position="" data-hide-link-title="0">Find this author on Google Scholar</a></li><li class="author-tooltip-pubmed-link"><a href="/lookup/external-ref?access_num=NISHI%20S&link_type=AUTHORSEARCH" target="_blank" class="" data-icon-position="" data-hide-link-title="0">Find this author on PubMed</a></li><li class="author-site-search-link last"><a href="/search/author1%3ASOICHIRO%2BNISHI%2B" rel="nofollow" class="" data-icon-position="" data-hide-link-title="0">Search for this author on this site</a></li></ul></div><div class="author-tooltip-3"><div class="author-tooltip-name">TOSHIYUKI TSUNODA </div><div class="author-tooltip-affiliation"><span class="author-tooltip-text"><div class='author-affiliation'><span class='nlm-sup'>4</span>Department of Cell Biology, Faculty of Medicine, Fukuoka University, Fukuoka, Japan;</div></span></div><ul class="author-tooltip-find-more"><li class="author-tooltip-gs-link first"><a href="/lookup/google-scholar?link_type=googlescholar&gs_type=author&author%5B0%5D=TOSHIYUKI%2BTSUNODA%2B" target="_blank" class="" data-icon-position="" data-hide-link-title="0">Find this author on Google Scholar</a></li><li class="author-tooltip-pubmed-link"><a href="/lookup/external-ref?access_num=TSUNODA%20T&link_type=AUTHORSEARCH" target="_blank" class="" data-icon-position="" data-hide-link-title="0">Find this author on PubMed</a></li><li class="author-site-search-link last"><a href="/search/author1%3ATOSHIYUKI%2BTSUNODA%2B" rel="nofollow" class="" 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class="panel-display panel-1col clearfix" > <div class="panel-panel panel-col"> <div><div class="panel-pane pane-highwire-markup" > <div class="pane-content"> <div class="highwire-markup"><div xmlns="http://www.w3.org/1999/xhtml" data-highwire-cite-ref-tooltip-instance="highwire_reflinks_tooltip" class="content-block-markup" xmlns:xhtml="http://www.w3.org/1999/xhtml"><div class="article fulltext-view "><span class="highwire-journal-article-marker-start"></span><div class="section abstract" id="abstract-1"><h2>Abstract</h2><p id="p-3">Background: The epipharynx, with its high expression of Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) entry factors angiotensin-converting enzyme 2 (ACE2) and transmembrane protease, serine 2 (TMPRSS2), is a primary target for SARS-CoV-2 replication in the early stage of Coronavirus Disease 19 (COVID-19). Epipharyngeal abrasive therapy (EAT) is a treatment for epipharyngitis in Japan which involves applying zinc chloride to the epipharyngeal mucosa. In this study, we evaluated the expression patterns of ACE2 and TMPRSS2 in tissue samples from patients before and after EAT. Patients and Methods: The study subjects were seven patients that had not been treated with EAT and 11 patients that had. For immunohistochemical assessment of the epipharyngeal mucosa, the staining intensity of ACE2 and TMPRSS2 was described as an immunohistochemical score (IHC score). Results: The IHC scores for ACE2 and TEMPRSS2 in the EAT-treated group were 3.40-fold and 1.81-fold lower, respectively, than those in the non-treated group (p=0.0208 and p=0.0244, respectively). Conclusion: EAT down-regulates the expression of SARS-CoV-2 entry factors ACE2 and TMPRSS2. Thus, EAT has potential as a novel COVID-19 preventative method.</p></div><ul class="kwd-group"><li class="kwd"><a href="/keyword/epipharyngeal-abrasive-therapy" class="hw-term hw-article-keyword hw-article-keyword-epipharyngeal-abrasive-therapy" rel="nofollow">Epipharyngeal abrasive therapy</a></li><li class="kwd"><a href="/keyword/eat" class="hw-term hw-article-keyword hw-article-keyword-eat" rel="nofollow">EAT</a></li><li class="kwd"><a href="/keyword/sars-cov-2" class="hw-term hw-article-keyword hw-article-keyword-sars-cov-2" rel="nofollow">SARS-CoV-2</a></li><li class="kwd"><a href="/keyword/ace2" class="hw-term hw-article-keyword hw-article-keyword-ace2" rel="nofollow">ACE2</a></li><li class="kwd"><a href="/keyword/tmprss2" class="hw-term hw-article-keyword hw-article-keyword-tmprss2" rel="nofollow">TMPRSS2</a></li></ul><p id="p-4">The epipharynx comprises ciliated epithelium and lymphoid tissue helped to prevent bacterial and viral infection; however, a recent study showed that severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), which causes COVID-19 disease, employs ciliary angiotensin-converting enzyme 2 (ACE2) and transmembrane protease, serine 2 (TMPRSS2) to enter and replicate within the epipharyngeal epithelium (<a id="xref-ref-1-1" class="xref-bibr" href="#ref-1">1</a>).</p><p id="p-5">Epipharyngeal abrasive therapy (EAT) utilizes zinc chloride (ZnCl<sub>2</sub>) for its astringent, denaturing, and anti-inflammatory properties in the treatment of chronic epipharyngitis and related immune symptoms (<a id="xref-ref-2-1" class="xref-bibr" href="#ref-2">2</a>, <a id="xref-ref-3-1" class="xref-bibr" href="#ref-3">3</a>). In addition, EAT is considered to be effective in preventing epipharyngitis caused by infectious pathogens, including viruses (<a id="xref-ref-4-1" class="xref-bibr" href="#ref-4">4</a>).</p><p id="p-6">In this study, to examine whether EAT has potential as a method to prevent COVID-19, we evaluated the mRNA and protein expression patterns of SARS-CoV-2 entry factors ACE2 and TMPRSS2 in tissue samples from patients before and after EAT.</p><div class="section patients-methods" id="sec-1"><h2 class="">Patients and Methods</h2><p id="p-7"><em>Patients and tissue samples</em>. Patient information was obtained with permission from the Ethics Committee of Fukuoka Dental College (ID: 552). Samples were obtained by endoscopic epipharyngeal biopsy between July 2021 and August 2021. The subjects of this study were seven patients with chronic epipharyngitis that had not been treated with EAT (mean age=53.3±18.3 years) and 11 patients that had been treated with EAT for chronic epipharyngitis for 1 month or more (mean age=64.4±11.9 years). All participants provided informed written consent. The research was conducted in accordance with the Declaration of Helsinki and Title 45, US Code of Federal Regulations, Part 46, Protection of Human Subjects, effective as of December 13, 2001.</p><p id="p-8"><em>EAT</em>. Zinc chloride (1%) was applied to the epipharyngeal mucosa of patients in the Outpatient Department one to three times a week by a Board-certified otorhinolaryngologist using a cotton swab (<a id="xref-fig-1-1" class="xref-fig" href="#F1">Figure 1A and B</a>), as described previously (<a id="xref-ref-2-2" class="xref-bibr" href="#ref-2">2</a>, <a id="xref-ref-3-2" class="xref-bibr" href="#ref-3">3</a>).</p><div id="F1" class="fig pos-float odd"><div class="highwire-figure"><div class="fig-inline-img-wrapper"><div class="fig-inline-img"><a href="https://iv.iiarjournals.org/content/invivo/36/1/371/F1.large.jpg?width=800&height=600&carousel=1" title="Epipharyngeal abrasive therapy (EAT). A: Cotton swabs for EAT. B: EAT procedure. Left panel shows the method of endoscopic EAT. Right panel shows the method of transoral EAT. C: Transnasal endoscopic photographs of the epipharynx in a patient. Left panel shows transnasal endoscopic photographs of the epipharynx pre-EAT treatment. Right panel shows transnasal endoscopic photographs of the epipharynx following 3 months of treatment with EAT. The arrowhead indicates the temporal whitening phenomenon. D: Hematoxylin and eosin (HE) staining of the epipharynx mucosa of a patient. Upper panel shows HE staining of the epipharynx pre-EAT treatment. Lower panel shows HE staining of the epipharynx following 3 months of EAT treatment. The arrowhead indicates cilia on the surface of epithelial cells." class="highwire-fragment fragment-images colorbox-load" rel="gallery-fragment-images-1957265019" data-figure-caption="<div class="highwire-markup">Epipharyngeal abrasive therapy (EAT). A: Cotton swabs for EAT. B: EAT procedure. Left panel shows the method of endoscopic EAT. Right panel shows the method of transoral EAT. C: Transnasal endoscopic photographs of the epipharynx in a patient. Left panel shows transnasal endoscopic photographs of the epipharynx pre-EAT treatment. Right panel shows transnasal endoscopic photographs of the epipharynx following 3 months of treatment with EAT. The arrowhead indicates the temporal whitening phenomenon. D: Hematoxylin and eosin (HE) staining of the epipharynx mucosa of a patient. Upper panel shows HE staining of the epipharynx pre-EAT treatment. Lower panel shows HE staining of the epipharynx following 3 months of EAT treatment. The arrowhead indicates cilia on the surface of epithelial cells.</div>" data-icon-position="" data-hide-link-title="0"><span class="hw-responsive-img"><img class="highwire-fragment fragment-image lazyload" alt="Figure 1." src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" data-src="https://iv.iiarjournals.org/content/invivo/36/1/371/F1.medium.gif" width="440" height="230"/><noscript><img class="highwire-fragment fragment-image" alt="Figure 1." src="https://iv.iiarjournals.org/content/invivo/36/1/371/F1.medium.gif" width="440" height="230"/></noscript></span></a></div></div><ul class="highwire-figure-links inline"><li class="download-fig first"><a href="https://iv.iiarjournals.org/content/invivo/36/1/371/F1.large.jpg?download=true" class="highwire-figure-link highwire-figure-link-download" title="Download Figure 1." data-icon-position="" data-hide-link-title="0">Download figure</a></li><li class="new-tab"><a href="https://iv.iiarjournals.org/content/invivo/36/1/371/F1.large.jpg" class="highwire-figure-link highwire-figure-link-newtab" target="_blank" data-icon-position="" data-hide-link-title="0">Open in new tab</a></li><li class="download-ppt last"><a href="/highwire/powerpoint/17444" class="highwire-figure-link highwire-figure-link-ppt" data-icon-position="" data-hide-link-title="0">Download powerpoint</a></li></ul></div><div class="fig-caption" xmlns:xhtml="http://www.w3.org/1999/xhtml"><span class="fig-label">Figure 1.</span> <p id="p-9" class="first-child">Epipharyngeal abrasive therapy (EAT). A: Cotton swabs for EAT. B: EAT procedure. Left panel shows the method of endoscopic EAT. Right panel shows the method of transoral EAT. C: Transnasal endoscopic photographs of the epipharynx in a patient. Left panel shows transnasal endoscopic photographs of the epipharynx pre-EAT treatment. Right panel shows transnasal endoscopic photographs of the epipharynx following 3 months of treatment with EAT. The arrowhead indicates the temporal whitening phenomenon. D: Hematoxylin and eosin (HE) staining of the epipharynx mucosa of a patient. Upper panel shows HE staining of the epipharynx pre-EAT treatment. Lower panel shows HE staining of the epipharynx following 3 months of EAT treatment. The arrowhead indicates cilia on the surface of epithelial cells.</p><div class="sb-div caption-clear"></div></div></div><p id="p-10"><em>Antibodies</em>. Primary rabbit antibody to ACE2 (HPA000288) was purchased from Sigma-Aldrich (St. Louis, MO, USA) and rabbit antibody to TMPRSS2 (#14437-1-AP) was purchased from PROTEINTECH (Rosemont, IL, USA) The secondary horseradish peroxidase (HRP)-conjugated polymer anti-rabbit antibody was purchased from DAKO-Agilent Technologies Co. (Santa Clara, CA, USA).</p><p id="p-11"><em>Immunohistochemical (IHC) staining and RNA in situ hybridization</em>. Neutral buffered formalin (10%)-fixed and paraffin-embedded tissue blocks were cut into 4 μm-thick sections for hematoxylin-eosin and IHC staining. Antigen retrieval was performed for all sections by an autoclave treatment at 121°C for 5 min in 0.01 M citrate buffer, pH 6.0. Immunostaining was performed by using EnVision/HRP kit (DAKO). Briefly, the sections were treated with a 0.1% hydrogen peroxide-methanol solution to inhibit endogenous peroxidase activity and a 5% bovine serum albumin/tris buffered saline to block any non-specific binding of primary antibodies. Subsequently, each section was incubated with the primary antibody against ACE2 (1:100 dilution) or TMPRSS2 (1:100 dilution) at 4°C overnight. These sections were then incubated with HRP-conjugated polymer anti-rabbit or anti-mouse antibody. The peroxidase activity was visualized using 0.1% 3,3’-diaminobenzidine and 0.01% hydrogen peroxide in tris buffered saline. for ihc assessment, the staining intensity of slides was described as an IHC score (scored on a scale of 0-3; 0: negative, 1: weakly positive, 2: intermediately positive, 3: strongly positive). To detect <em>ACE2/TMPRSS2</em> mRNA on the tissue, the <em>in situ</em> hybridization system RNA scope (Advanced Cell Diagnostics, Hayward, CA, USA) was used following the manufacturer’s guidelines. The expression levels of mRNA were qualitatively evaluated.</p><p id="p-12"><em>Statistical analysis</em>. All data are expressed as the mean±standard error of the mean. Mann-Whitney <em>U</em>-tests were applied for comparisons between two groups. Statistical significance was set as <em>p</em><0.05.</p></div><div class="section results" id="sec-2"><h2 class="">Results</h2><p id="p-13">Continuous EAT resulted in reduced redness and temporary whitening of the epipharyngeal mucosa, which was considered to indicate reduced inflammation (<a id="xref-fig-1-2" class="xref-fig" href="#F1">Figure 1</a>C). In the group not treated with EAT, the epipharyngeal mucosa comprised ciliated epithelium, whereas in the EAT-treated group, squamous metaplasia was evident in the epipharyngeal mucosa (<a id="xref-fig-1-3" class="xref-fig" href="#F1">Figure 1</a>D). Importantly, ACE2/TMPRESS2 expression was not detected in the region of squamous metaplasia in the EAT-treated group, as determined by IHC and mRNA <em>in situ</em> hybridization (<a id="xref-fig-2-1" class="xref-fig" href="#F2">Figure 2</a>A). The IHC scores for ACE2 and TEMPRSS2 in the EAT-treated group were 3.40-fold and 1.81-fold lower than those in the non-treated group, respectively (ACE2: <em>p</em>=0.0208, TMPRSS2: <em>p</em>=0.0244; <a id="xref-fig-2-2" class="xref-fig" href="#F2">Figure 2</a>B).</p><div id="F2" class="fig pos-float odd"><div class="highwire-figure"><div class="fig-inline-img-wrapper"><div class="fig-inline-img"><a href="https://iv.iiarjournals.org/content/invivo/36/1/371/F2.large.jpg?width=800&height=600&carousel=1" title="mRNA and protein expression patterns of angiotensin-converting enzyme 2 (ACE2) and transmembrane protease, serine 2 (TMPRSS2) in patient tissue samples without and with epipharyngeal abrasive therapy (EAT). A: ACE2 and TMPRSS2 expression in the epipharynx of the EAT-treated and non-treated groups. The upper and middle panels show the protein expression patterns. The lower panels show the mRNA expression patterns. Arrowheads indicate the mRNA expression of ACE2. B: Immunohistochemical (IHC) scores for ACE2 and TMPRSS2 expression on the epipharyngeal mucosa of the EAT-treated (n=11) and non-treated groups (n=7). *Significantly different at p" class="highwire-fragment fragment-images colorbox-load" rel="gallery-fragment-images-1957265019" data-figure-caption="<div class="highwire-markup">mRNA and protein expression patterns of angiotensin-converting enzyme 2 (ACE2) and transmembrane protease, serine 2 (TMPRSS2) in patient tissue samples without and with epipharyngeal abrasive therapy (EAT). A: ACE2 and TMPRSS2 expression in the epipharynx of the EAT-treated and non-treated groups. The upper and middle panels show the protein expression patterns. The lower panels show the mRNA expression patterns. Arrowheads indicate the mRNA expression of ACE2. B: Immunohistochemical (IHC) scores for ACE2 and TMPRSS2 expression on the epipharyngeal mucosa of the EAT-treated (n=11) and non-treated groups (n=7). *Significantly different at p<0.05.</div>" data-icon-position="" data-hide-link-title="0"><span class="hw-responsive-img"><img class="highwire-fragment fragment-image lazyload" alt="Figure 2." src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" data-src="https://iv.iiarjournals.org/content/invivo/36/1/371/F2.medium.gif" width="202" height="440"/><noscript><img class="highwire-fragment fragment-image" alt="Figure 2." src="https://iv.iiarjournals.org/content/invivo/36/1/371/F2.medium.gif" width="202" height="440"/></noscript></span></a></div></div><ul class="highwire-figure-links inline"><li class="download-fig first"><a href="https://iv.iiarjournals.org/content/invivo/36/1/371/F2.large.jpg?download=true" class="highwire-figure-link highwire-figure-link-download" title="Download Figure 2." data-icon-position="" data-hide-link-title="0">Download figure</a></li><li class="new-tab"><a href="https://iv.iiarjournals.org/content/invivo/36/1/371/F2.large.jpg" class="highwire-figure-link highwire-figure-link-newtab" target="_blank" data-icon-position="" data-hide-link-title="0">Open in new tab</a></li><li class="download-ppt last"><a href="/highwire/powerpoint/17679" class="highwire-figure-link highwire-figure-link-ppt" data-icon-position="" data-hide-link-title="0">Download powerpoint</a></li></ul></div><div class="fig-caption"><span class="fig-label">Figure 2.</span> <p id="p-14" class="first-child">mRNA and protein expression patterns of angiotensin-converting enzyme 2 (ACE2) and transmembrane protease, serine 2 (TMPRSS2) in patient tissue samples without and with epipharyngeal abrasive therapy (EAT). A: ACE2 and TMPRSS2 expression in the epipharynx of the EAT-treated and non-treated groups. The upper and middle panels show the protein expression patterns. The lower panels show the mRNA expression patterns. Arrowheads indicate the mRNA expression of ACE2. B: Immunohistochemical (IHC) scores for ACE2 and TMPRSS2 expression on the epipharyngeal mucosa of the EAT-treated (n=11) and non-treated groups (n=7). *Significantly different at p<0.05.</p><div class="sb-div caption-clear"></div></div></div></div><div class="section discussion" id="sec-3"><h2 class="">Discussion</h2><p id="p-15">EAT was originally developed in Japan as a treatment to reduce chronic epipharyngitis, which causes various upper respiratory tract symptoms such as postnasal drip, throat pain and cough (<a id="xref-ref-3-3" class="xref-bibr" href="#ref-3">3</a>). In addition, EAT has been reported to be effective in improving symptoms of autoimmune diseases such as IgA nephropathy and psoriatic arthritis associated with chronic epipharyngitis. (<a id="xref-ref-2-3" class="xref-bibr" href="#ref-2">2</a>, <a id="xref-ref-5-1" class="xref-bibr" href="#ref-5">5</a>, <a id="xref-ref-6-1" class="xref-bibr" href="#ref-6">6</a>). A former study showed that continuous EAT macroscopically induces mucosal whitening, defined as temporal whitening phenomenon (<a id="xref-ref-7-1" class="xref-bibr" href="#ref-7">7</a>), suggesting that ZnCl<sub>2</sub> utilized in EAT induces an astringent effect on inflamed mucosa (<a id="xref-ref-2-4" class="xref-bibr" href="#ref-2">2</a>). We microscopically found that EAT induces squamous metaplasia, resulting in the disappearance of ciliary structures exhibiting expression of SARS-CoV-2 entry factors ACE2 and TMPRSS2. Thereby, the mRNA expression of ACE2 and TMPRSS2 was reduced. These results suggested that EAT transcriptionally regulates expression of ACE2 and TMPRSS2 during squamous metaplasia, where these proteins were previously suggested to be absent (<a id="xref-ref-1-2" class="xref-bibr" href="#ref-1">1</a>). SARS-CoV-2 enters human cells <em>via</em> binding to ACE2, followed by its priming by TMPRSS2 (<a id="xref-ref-8-1" class="xref-bibr" href="#ref-8">8</a>). Therefore, these proteins are potential targets for antiviral intervention for the prevention of SARS-CoV-2 infection or in related treatment (<a id="xref-ref-9-1" class="xref-bibr" href="#ref-9">9</a>). In one study, TMPRSS2 inhibitor was not found to be effective at preventing SARS-CoV-2 infection (<a id="xref-ref-10-1" class="xref-bibr" href="#ref-10">10</a>), suggesting that targeting TMPRSS2 alone is not critical for preventing viral infection. In contrast, recent studies indicate that nasal administration of ACE2 inhibitor or vaccine is passably effective for SARS-CoV-2 prevention (<a id="xref-ref-1-3" class="xref-bibr" href="#ref-1">1</a>, <a id="xref-ref-11-1" class="xref-bibr" href="#ref-11">11</a>). However, these approaches require further investigation and dual inhibition is suggested to be more critical for preventing viral infection. EAT is a simple method of reducing ciliary ACE2/TMPRSS2 expression. No intervention study has been conducted to investigate the preventative effect of EAT on SARS-CoV-2 infection. However, as lower ACE2 and TMPRSS2 expression might be helpful in reducing acquisition of SARS-CoV-2 infection in the upper airway (<a id="xref-ref-12-1" class="xref-bibr" href="#ref-12">12</a>, <a id="xref-ref-13-1" class="xref-bibr" href="#ref-13">13</a>), EAT may have potential as a novel method for preventing COVID-19.</p></div><div class="section ack" id="ack-1"><h2 class="">Acknowledgements</h2><p id="p-18">The Authors thank Dr. Hiroaki Tanaka for his technical assistance regarding EAT.</p></div><div class="section fn-group" id="fn-group-1"><h2>Footnotes</h2><ul><li class="fn" id="fn-1"><p id="p-1"><strong>Authors’ Contributions</strong></p><p id="p-2">K.N. and S.Y. designed the study, performed the analyses, analyzed the data and wrote the article; J.O. and T.Y. collected the data; S.N. gave technical supports; T.T., M.Y., and K.H. gave conceptual advice.</p></li><li class="fn" id="fn-2"><p id="p-16"><strong>Conflicts of Interest</strong></p><p id="p-17">The Authors declare that they have no competing interests.</p></li></ul></div><ul class="history-list"><li xmlns:hwp="http://schema.highwire.org/Journal" class="received" hwp:start="2021-10-31"><span class="received-label">Received </span>October 31, 2021.</li><li xmlns:hwp="http://schema.highwire.org/Journal" class="rev-recd" hwp:start="2021-11-29"><span class="rev-recd-label">Revision received </span>November 29, 2021.</li><li xmlns:hwp="http://schema.highwire.org/Journal" class="accepted" hwp:start="2021-11-30"><span class="accepted-label">Accepted </span>November 30, 2021.</li></ul><ul class="copyright-statement"><li class="fn" id="copyright-statement-1">Copyright © 2022 International Institute of Anticancer Research (Dr. George J. 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