TET1 inhibits liver fibrosis by blocking hepatic stellate cell activation

Author:

Wang Jingjie12ORCID,Zhang Yitong2,Ma Yanyun345,Zhao Suhan2,Wang Jiucun34,Chen Hongtan1,Zhang Jun2,Liu Jie23

Affiliation:

1. Department of Gastroenterology, The First Affiliated Hospital, College of Medicine Zhejiang University Hangzhou China

2. Department of Digestive Diseases, Huashan Hospital Fudan University Shanghai China

3. State Key Laboratory of Genetic Engineering, Human Phenome Institute Fudan University Shanghai China

4. Department of Anthropology and Human Genetics, School of Life Sciences Fudan University Shanghai China

5. Six‐sector Industrial Research Institute Fudan University Shanghai China

Abstract

AbstractHepatic stellate cells (HSCs) are critical regulator contributing to the onset and progression of liver fibrosis. Chronic liver injury triggers HSCs to undergo vast changes and trans‐differentiation into a myofibroblast HSCs, the mechanism remains to be elucidated. This study investigated that the involvement of hydroxymethylase TET1 (ten–eleven 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‐like 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‐type mice. In conclusion, we suggested that TET1 plays a significant role in HSC activation and liver fibrosis, which provides a promising target for anti‐fibrotic therapies.

Funder

National Science and Technology Major Project

National Natural Science Foundation of China

Publisher

Wiley

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