和酸诱导mTORC1驱动的综合应激反应,有助于肝细胞中的葡萄糖脂毒性
Rui Guo1, Yanhui Li1, Yuwei Jiang2
1Department of Kinesiology and Nutrition, University of Illinois Chicago, Chicago, Illinois, United States.
概括
肝脏葡萄糖脂毒性涉及通过mTORC1-eIF2α-ATF4通路的Palmitate诱导的综合应激反应 (ISR) 激活. 高葡萄糖通过增加和酸的基质来加剧这种情况,从而放大细胞死亡.
科学领域:
- 细胞生物学 细胞生物学
- 代谢性疾病研究研究
- 肝病学 肝病学是一种肝病学.
背景情况:
- 肝脏葡萄糖脂毒性是代谢性肝脏疾病的关键因素,是由于高葡萄糖和脂质水平的结合造成的.
- 导致肝脏葡萄糖脂毒性的精确分子机制尚不完全理解.
研究的目的:
- 阐明肝脏葡萄糖脂毒性涉及的细胞和分子途径.
- 为了确定palmitate诱导的肝细胞损伤的上游调节者和下游影响者.
主要方法:
- 利用AML12和HepG2细胞作为肝脏葡萄糖脂毒性的体外模型.
- 研究了综合应激反应 (ISR),mTORC1和ATF4在棕酸盐诱导的细胞死亡中的作用.
- 评估了甘-3-酸盐转移酶 (GPAT4) 和酸代谢的影响.
主要成果:
- 在肝细胞中,Palmitate暴露诱导了ISR激活 (eIF2α酸化,ATF4上调).
- mTORC1被确定为一个关键的上游激酶调解Palmitate诱导的ISR.
- 抑制mTORC1,ISR,或ATF4,或GPAT4淘汰,防止棕酸盐诱导的细胞死亡.
- 通过增加甘-3-酸盐的可用性,增强和酸酸的产生和mTORC1的激活,提高高葡萄糖强化棕酸诱导的肝毒性.
结论:
- 由和酸调节的mTORC1-eIF2α-ATF4通路,对于调节棕酸诱导的肝细胞死亡至关重要.
- 高葡萄糖通过促进和酸合成,加剧肝脏脂毒性,从而导致葡萄糖脂毒性.
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