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To elucidate the effects of CSA on the thymus more precisely, we analyzed the effects of CSA on the thymus and T cell system using rats. In addition to confirming the phenomena already reported, we newly found that the proportion of recent thymic emigrants also greatly decreased, suggesting impaired supply. Immunohistologically, the medullary thymic epithelial cells (mTECs) presented with a relative decrease in the subset with a competent phenotype and downregulation of class II major histocompatibility complex molecules. In control rats, thymic dendritic cells (DCs) comprised two subsets, XCR1<jats:sup>+<\/jats:sup>SIRP1\u03b1<jats:sup>\u2212<\/jats:sup>CD4<jats:sup>\u2212<\/jats:sup>and XCR1<jats:sup>\u2212<\/jats:sup>SIRP1\u03b1<jats:sup>+<\/jats:sup>CD4<jats:sup>+<\/jats:sup>. The former had a tendency to selectively localize in the previously-reported epithelium-containing areas of the rat medullas, and the number was significantly reduced by CSA treatment. The epithelium-free areas, another unique domains in the rat medullas, contained significantly more Foxp3<jats:sup>+<\/jats:sup>thymic Tregs. With CSA treatment, the epithelium-free areas presented strong involution, and the number and distribution of Tregs in the medulla were greatly reduced. These results suggest that CSA inhibits the production of single-positive thymocytes, including Tregs, and disturbs the microenvironment of the thymic medulla, with a decrease of the competent mTECs and disorganization of epithelium-free areas and DC subsets, leading to a generation of autoreactive T cells with selective medullary involution.<\/jats:p>","DOI":"10.1007\/s00418-021-01993-y","type":"journal-article","created":{"date-parts":[[2021,5,16]],"date-time":"2021-05-16T14:02:15Z","timestamp":1621173735000},"page":"133-146","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Selective involution of thymic medulla by cyclosporine A with a decrease of mature thymic epithelia, XCR1+ dendritic cells, and epithelium-free areas containing Foxp3+ thymic regulatory T cells"],"prefix":"10.1007","volume":"156","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6249-2133","authenticated-orcid":false,"given":"Yasushi","family":"Sawanobori","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yusuke","family":"Kitazawa","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hisashi","family":"Ueta","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kenjiro","family":"Matsuno","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nobuko","family":"Tokuda","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2021,5,16]]},"reference":[{"issue":"1\u20133","key":"1993_CR2","doi-asserted-by":"publisher","first-page":"177","DOI":"10.1007\/s12026-012-8301-y","volume":"54","author":"K Alexandropoulos","year":"2012","unstructured":"Alexandropoulos K, Danzl NM (2012) Thymic epithelial cells: antigen presenting cells that regulate T cell repertoire and tolerance development. 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Animal handling and care protocols were approved by the Dokkyo Medical University\u2019s Regulations for Animal Experiments and with Japanese Governmental Law (No. 105).","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethical approval"}}]}}