TRIB3-TRIM8复合体通过调节HNF4α稳定性来驱动NAFLD的进展
Meng-Chao Xiao1, Nan Jiang1, Li-Lin Chen2
1Department of Gastroenterology, Shanghai East Hospital, School of Medicine, Tongji University, Shanghai 200092, China; Department of Gastroenterology, Changzheng Hospital, Naval Medical University, Shanghai, China.
Journal of hepatology
|January 18, 2024
概括
在非酒精性脂肪性肝病 (NAFLD) 中,细胞内膜网膜应激通过TRIB3-TRIM8 E3结合酶复合体降解肝核因子4α (HNF4α). 破坏这种相互作用会稳定HNF4α,改善NAFLD的进展.
科学领域:
- 肝病学和分子生物学.
- 肝病的发病因子 肝病的发病因子
- 蛋白质降解机制 蛋白质降解机制
背景情况:
- 肝细胞内质网膜 (ER) 的压力有助于非酒精性脂肪肝疾病 (NAFLD).
- 减少肝核因子4α (HNF4α) 表达是NAFLD和其他肝脏疾病的关键.
- HNF4α蛋白降解的机制,特别是在ER压力下,以前是未知的.
研究的目的:
- 为了阐明HNF4α的降解途径.
- 研究ER应激在HNF4α调节中的作用.
- 通过稳定HNF4α来确定NAFLD的治疗策略.
主要方法:
- 在人类和小鼠NAFLD组织中评估了HNF4α和tribles同类物3 (TRIB3) 相对关系.
- 采用RNA测序,质谱,共免疫沉和无处不在的测试.
- 利用分子对接和共同免疫沉降来识别抑制TRIB3-HNF4α相互作用的.
主要成果:
- TRIB3直接与HNF4α相互作用,通过ER压力调解其降解.
- 含有8 (TRIM8) 的三部分基因的TRIB3形成了HNF4α无处不在的E3结合酶复合体.
- 一种破坏TRIB3-HNF4α相互作用的细胞透恢复了HNF4α水平,并改善了小鼠的NAFLD.
- 一种TRIB3变体 (p.Q84R) 与NAFLD进展相关,并在小鼠中诱导了更严重的肝肥胖症.
结论:
- 在NAFLD中,TRIB3-TRIM8 E3结合酶复合体驱动HNF4α降解.
- 准TRIB3-TRIM8 E3复合体为NAFLD提供了一个潜在的治疗策略.
- 通过破坏TRIB3-HNF4α相互作用来稳定HNF4α,为治疗NAFLD和其他肝脏疾病提供了一种新方法.
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