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Tumor Necrosis Factor α–Induced Protein 8–Like 2 Alleviates Nonalcoholic Fatty Liver Disease Through Suppressing Transforming Growth Factor Beta–Activated Kinase 1 Activation

肿瘤坏死因子α 非酒精性脂肪肝 炎症 癌症研究 医学 蛋白激酶A 内科学 激酶 内分泌学 p38丝裂原活化蛋白激酶 脂肪肝 脂肪变性 纤维化 生物 细胞生物学 疾病
作者
Yupeng Liu,Jingjing Song,Juan Yang,Jilin Zheng,Ling Yang,Jun Gao,Tian Shen,Zhen Liu,Xiaoxue Meng,Jian‐Cheng Wang,Zhifei Dai,Yi‐Da Tang
出处
期刊:Hepatology [Wiley]
卷期号:74 (3): 1300-1318 被引量:16
标识
DOI:10.1002/hep.31832
摘要

NAFLD prevalence has increased rapidly and become a major global health problem. Tumor necrosis factor α-induced protein 8-like 2 (TIPE2) plays a protective role in a cluster of liver diseases, such as autoimmune hepatitis, hepatitis B, and hepatocellular carcinoma. However, the function of TIPE2 in NAFLD remains unknown. Here, we investigated the role of TIPE2 in the development of NAFLD.Our study found that in vitro overexpression or knockout of TIPE2 significantly ameliorated or aggravated lipid accumulation and inflammation in hepatocytes exposed to metabolic stimulation, respectively. Consistently, in vivo hepatic steatosis, insulin resistance, inflammation, and fibrosis were alleviated in hepatic Tipe2-transgenic mice but exaggerated in hepatic Tipe2-knockout mice treated by metabolic challenges. RNA sequencing revealed that TIPE2 was significantly associated with the mitogen-activated protein kinase pathway. Mechanistic experiments demonstrated that TIPE2 bound with transforming growth factor beta-activated kinase 1 (TAK1), prevented tumor necrosis factor receptor-associated factor 6-mediated TAK1 ubiquitination and subsequently inhibited the TAK1 phosphorylation and activation of TAK1-c-Jun N-terminal kinase (JNK)/p38 signaling. Further investigation showed that blocking the activity of TAK1 reversed the worsening of hepatic metabolic disorders and inflammation in hepatic-specific Tipe2-knockout hepatocytes and mice treated with metabolic stimulation.TIPE2 suppresses NAFLD advancement by blocking TAK1-JNK/p38 pathway and is a promising target molecule for NAFLD therapy.
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