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Chronic liver injury triggers HSCs to undergo vast changes and trans\u2010differentiation into a myofibroblast HSCs, the mechanism remains to be elucidated. This study investigated that the involvement of hydroxymethylase TET1 (ten\u2013eleven translocation 1) in HSC activation and liver fibrosis. It is revealed that TET1 levels were downregulated in the livers in mouse models of liver fibrosis and patients with cirrhosis, as well as activated HSCs in comparison to quiescent HSCs. In vitro data showed that the inhibition of TET1 promoted the activation HSC, whereas TET1 overexpression inhibited HSC activation. Moreover, TET1 could regulate KLF2 (Kruppel\u2010like transcription factors) transcription by promoting hydroxymethylation of its promoter, which in turn suppressed the activation of HSCs. In vivo, it is confirmed that liver fibrosis was aggravated in Tet1 knockout mice after CCl4 injection, accompanied by excessive activation of primary stellate cells, in contrast to wild\u2010type mice. In conclusion, we suggested that TET1 plays a significant role in HSC activation and liver fibrosis, which provides a promising target for anti\u2010fibrotic therapies.<\/jats:p>","DOI":"10.1111\/jgh.16443","type":"journal-article","created":{"date-parts":[[2024,2,19]],"date-time":"2024-02-19T06:44:47Z","timestamp":1708325087000},"page":"1403-1412","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["TET1 inhibits liver fibrosis by blocking hepatic stellate cell activation"],"prefix":"10.1111","volume":"39","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8491-8649","authenticated-orcid":false,"given":"Jingjie","family":"Wang","sequence":"first","affiliation":[{"name":"Department of Gastroenterology, The First Affiliated Hospital, College of Medicine Zhejiang University  Hangzhou China"},{"name":"Department of Digestive Diseases, Huashan Hospital Fudan University  Shanghai 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