1. MicroRNA-195-3p promotes hepatic stellate cell activation and liver fibrosis by suppressing PTEN expression.
- Author
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Wang A, Bu FT, Li JJ, Zhang YF, Jia PC, You HM, Wu S, Wu YY, Zhu S, Huang C, and Li J
- Subjects
- 3' Untranslated Regions, Animals, Carbon Tetrachloride Poisoning pathology, Cell Line, Gene Expression Regulation drug effects, Humans, Male, Mice, Mice, Inbred C57BL, MicroRNAs genetics, PTEN Phosphohydrolase genetics, Phosphatidylinositol 3-Kinases genetics, Phosphatidylinositol 3-Kinases metabolism, Proto-Oncogene Proteins c-akt genetics, Proto-Oncogene Proteins c-akt metabolism, TOR Serine-Threonine Kinases genetics, TOR Serine-Threonine Kinases metabolism, Transforming Growth Factor beta1 genetics, Transforming Growth Factor beta1 metabolism, Up-Regulation, Chemical and Drug Induced Liver Injury metabolism, Hepatic Stellate Cells metabolism, Liver Cirrhosis chemically induced, MicroRNAs metabolism, PTEN Phosphohydrolase metabolism
- Abstract
Liver fibrosis is a reversible wound healing reaction characterized by abnormal accumulation of extracellular matrix (ECM) in response to liver injury. Recent studies have shown that it can be epigenetically regulated, especially by microRNAs (miRNAs). It has been acknowledged that activation of hepatic stellate cells (HSCs) is a pivotal step in the initiation and progression of liver fibrosis. Notably, our results showed that miR-195-3p was increased in HSCs isolated from CCl
4 -treated mice and that the increase was more pronounced as the degree of liver fibrosis increased. Moreover, treatment of LX-2 cells, a human immortalized hepatic stellate cell line, with TGF-β1 resulted remarkable upregulation of miR-195-3p. Gain-of-function and loss-of-function experiments have suggested that the increased levels of miR-195-3p inhibit the expression of phosphatase and tension homolog deleted on chromosome 10 (PTEN), a negative regulator of the PI3K/Akt/mTOR signaling pathway in liver fibrosis, thereby contributing to HSC activation and proliferation and promoting the expression of profibrotic genes, such as α-SMA and collagen I, in LX-2 cells, which accelerates the accumulation of fibrous extracellular matrix deposition in the liver, while knockdown of miR-195-3p induced the opposite effect. Taken together, these results provide evidence for the harmful role of miR-195-3p in CCl4 -treated mouse liver fibrosis., Competing Interests: Declaration of Competing Interest The authors report no declarations of interest., (Copyright © 2021 Elsevier B.V. All rights reserved.)- Published
- 2022
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