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Melanocyte\u2010specific CD8<jats:sup>+<\/jats:sup> T cells are recruited to the skin via chemokines, thereby releasing perforin, granzyme, and other cytotoxic substances that destroy the melanocytes. However, the mechanism of CD8<jats:sup>+<\/jats:sup> T cells to adhere to melanocytes is unknown. Previous transcriptome sequencing results published by our group showed that the occluding (<jats:italic>OCLN)<\/jats:italic> gene was significantly upregulated in CD8<jats:sup>+<\/jats:sup> T cells from skin lesions of vitiligo. Occludin is a crucial component of the tight junction between cells; in cells without tight junction, occludin mediates the adhesion of two cells in the form of a self\u2010ligand. This study demonstrated that <jats:italic>OCLN<\/jats:italic> gene expression was elevated in the CD8<jats:sup>+<\/jats:sup> T cells of vitiligo patients, and occludin mediates the adherence of CD8<jats:sup>+<\/jats:sup> T cells to melanocytes. Besides, pathological changes in vitiligo skin lesions reveal that CD8<jats:sup>+<\/jats:sup> T cells continuously persist in the skin lesions, which is related to the persistence of the disease. In this regard, we found that fibroblasts from vitiligo patients significantly express occludin, which may participate in the continuous retention of CD8<jats:sup>+<\/jats:sup> T cells in the skin lesions. The pathogenesis of vitiligo is closely related to oxidative stress, and our data suggest that overexpression of hypoxia\u2010inducible factor\u20101<jats:italic>\u03b1<\/jats:italic> (HIF\u20101<jats:italic>\u03b1<\/jats:italic>) increases the expression of occludin. Besides, ChIP\u2010qPCR of CD8<jats:sup>+<\/jats:sup> T cells revealed that HIF\u20101<jats:italic>\u03b1<\/jats:italic> directly binds to the <jats:italic>OCLN<\/jats:italic> promoter. Thus, occludin upregulation promotes the adhesion of CD8<jats:sup>+<\/jats:sup> T cells and melanocytes via the HIF\u20101<jats:italic>\u03b1<\/jats:italic> signaling pathway. Our study results suggested a critical role for <jats:italic>OCLN<\/jats:italic> in the occurrence, progression, and maintenance of vitiligo. Therefore, inhibiting the expression of <jats:italic>OCLN<\/jats:italic> gene may be a potential targeted treatment strategy.<\/jats:p>","DOI":"10.1155\/2022\/6732972","type":"journal-article","created":{"date-parts":[[2022,2,17]],"date-time":"2022-02-17T03:50:08Z","timestamp":1645069808000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":18,"title":["Occludin Promotes Adhesion of CD8<sup>+<\/sup> T Cells and Melanocytes in Vitiligo via the HIF\u20101<i>\u03b1<\/i> Signaling 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