Hepatology (Baltimore, Md.) · 2023
Persistent mTORC1 activation due to loss of liver tuberous sclerosis complex 1 promotes liver injury in alcoholic hepatitis.
СтатьяПоддержка NIH: внешняя программаНазвание и аннотация: Перевод в очереди
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Chao Xiaojuan, Wang Shaogui, Ma Xiaowen, Zhang Chen, Qian Hui, Williams Sha Neisha, Sun Zhaoli, Peng Zheyun, Liu Wanqing, Li Feng, Sheshadri Namratha, Zong Wei-Xing, Ni Hong-Min, Ding Wen-Xing
Аннотация
BACKGROUND AND AIMS: The aim of the study was to investigate the role and mechanisms of tuberous sclerosis complex 1 (TSC1) and mechanistic target of rapamycin complex 1 (mTORC1) in alcohol-associated liver disease.
APPROACH AND RESULTS: Liver-specific Tsc1 knockout (L- Tsc1 KO) mice and their matched wild-type mice were subjected to Gao-binge alcohol. Human alcoholic hepatitis (AH) samples were also used for immunohistochemistry staining, western blot, and quantitative real-time PCR (q-PCR) analysis. Human AH and Gao-binge alcohol-fed mice had decreased hepatic TSC1 and increased mTORC1 activation. Gao-binge alcohol markedly increased liver/body weight ratio and serum alanine aminotransferase levels in L- Tsc1 KO mice compared with Gao-binge alcohol-fed wild-type mice. Results from immunohistochemistry staining, western blot, and q-PCR analysis revealed that human AH and Gao-binge alcohol-fed L- Tsc1 KO mouse livers had significantly increased hepatic progenitor cells, macrophages, and neutrophils but decreased HNF4α-positive cells. Gao-binge alcohol-fed L- Tsc1 KO mice also developed severe inflammation and liver fibrosis. Deleting Tsc1 in cholangiocytes but not in hepatocytes promoted cholangiocyte proliferation and aggravated alcohol-induced ductular reactions, fibrosis, inflammation, and liver injury. Pharmacological inhibition of mTORC1 partially reversed hepatomegaly, ductular reaction, fibrosis, inflammatory cell infiltration, and liver injury in alcohol-fed L- Tsc1 KO mice.
CONCLUSIONS: Our findings indicate that persistent activation of mTORC1 due to the loss of cholangiocyte TSC1 promotes liver cell repopulation, ductular reaction, inflammation, fibrosis, and liver injury in Gao-binge alcohol-fed L- Tsc1 KO mice, which phenocopy the pathogenesis of human AH.
APPROACH AND RESULTS: Liver-specific Tsc1 knockout (L- Tsc1 KO) mice and their matched wild-type mice were subjected to Gao-binge alcohol. Human alcoholic hepatitis (AH) samples were also used for immunohistochemistry staining, western blot, and quantitative real-time PCR (q-PCR) analysis. Human AH and Gao-binge alcohol-fed mice had decreased hepatic TSC1 and increased mTORC1 activation. Gao-binge alcohol markedly increased liver/body weight ratio and serum alanine aminotransferase levels in L- Tsc1 KO mice compared with Gao-binge alcohol-fed wild-type mice. Results from immunohistochemistry staining, western blot, and q-PCR analysis revealed that human AH and Gao-binge alcohol-fed L- Tsc1 KO mouse livers had significantly increased hepatic progenitor cells, macrophages, and neutrophils but decreased HNF4α-positive cells. Gao-binge alcohol-fed L- Tsc1 KO mice also developed severe inflammation and liver fibrosis. Deleting Tsc1 in cholangiocytes but not in hepatocytes promoted cholangiocyte proliferation and aggravated alcohol-induced ductular reactions, fibrosis, inflammation, and liver injury. Pharmacological inhibition of mTORC1 partially reversed hepatomegaly, ductular reaction, fibrosis, inflammatory cell infiltration, and liver injury in alcohol-fed L- Tsc1 KO mice.
CONCLUSIONS: Our findings indicate that persistent activation of mTORC1 due to the loss of cholangiocyte TSC1 promotes liver cell repopulation, ductular reaction, inflammation, fibrosis, and liver injury in Gao-binge alcohol-fed L- Tsc1 KO mice, which phenocopy the pathogenesis of human AH.