通过通过LKB1核保留抑制AMPK活动,MKP1促进非酒精性脂肪肝炎
bioRxiv : the preprint server for biology
|July 28, 2023
概括
核MKP1抑制AMPKα,促进肝细胞死亡和非酒精性脂肪肝炎 (NASH). 删除MKP1激活AMPKα,防止NASH的发展及其相关的炎症和纤维化.
科学领域:
- 肝病学 肝病学是一种肝病学.
- 分子生物学分子生物学
- 生物化学 生物化学
背景情况:
- 非酒精性脂肪肝炎 (NASH) 涉及肝细胞死亡,炎症和纤维化,由降低的腺单酸 (AMP) 激活蛋白激酶-α (AMPKα) 活性驱动.
- 酶6激活是引发NASH肝细胞死亡的关键机制.
- 在NASH中,核局部化基因激活蛋白激酶 (MAPK) 酸酶-1 (MKP1) 被上调.
研究的目的:
- 调查核局部MKP1在非酒精性脂肪肝炎 (NASH) 的发展中的作用.
- 阐明涉及MKP1,p38 MAPK和肝激酶B1 (LKB1) 在NASH病变发生过程中的信号通路.
主要方法:
- 在NASH患者和食NASH诱导饮食的小鼠中分析MKP1表达.
- 研究氧化应激对MKP1表达和下游信号传递的影响.
- 利用小鼠MKP1的肝脏删除来评估其对LKB1,AMPKα激活和NASH进展的影响.
主要成果:
- 在NASH中增加的氧化应激增加了核MKP1的调节,导致p38 MAPK脱和减少LKB1的酸化,阻碍了LKB1的核出口.
- 在NASH小鼠中,MKP1的肝切除促进了LKB1的细胞质局部化,激活AMPKα.
- 通过MKP1删除激活AMPKα有效地防止肝细胞死亡,炎症,并改善NASH.
结论:
- 核MKP1-p38 MAPK-LKB1信号通路抑制了NASH中的AMPKα活性.
- 这种抑制AMPKα对于启动肝细胞死亡和推动NASH发展至关重要.
- 准核MKP1为NASH提供了一个潜在的治疗策略.
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