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缺氧可以通过调节HIF2α/PP4C信号传递来改善高脂肪饮食引起的肝脂积累

Zhe Liu¹, Jing Hou², MeiYuan Tian²

¹Research Center for High Altitude Medicine, Qinghai University, Xining 810000, China; Key Laboratory of Application and Foundation for High Altitude Medicine Research in Qinghai Province, Xining 810000, China; Department of Gynecology, Affiliated Hospital of Qinghai University, Xining 810000, China.

Cellular signalling

|March 20, 2025

概括

缺氧可以通过通过HIF2α降低蛋白质酸酶4C (PP4C) 来降低肝脏脂质积累. 这项研究探讨了PP4C.

科学领域:

分子生物学分子生物学
细胞的新陈代谢
肝脏疾病的发病因子肝脏疾病的发病因子

背景情况:

代谢相关的脂肪肝疾病 (MAFLD) 的特点是肝脏脂质的积累,肝硬化和肝瘤的前体.
驱动MAFLD进展的精确机制,特别是在低氧条件下,仍然不完全理解.
蛋白酸酶4C (PP4C) 是一种参与细胞代谢的酶,其在低氧下对MAFLD的作用需要调查.

研究的目的:

在体内和体外低毒条件下研究PP4C在肝脂代谢中的作用.
阐明PP4C影响肝脏脂质积累的分子机制,以应对缺氧.
评估PP4C作为治疗点的潜力,以控制肝脂积累.

主要方法:

关键蛋白质的分析,包括低氧诱导因子2α (HIF2α),PP4C,化AU丰富元素RNA结合因子1 (pAUF1),乙烯基-CoA核糖酶1 (ACC1) 和卡尼丁棕转移酶-1 (CPT1) 使用西式涂抹和免疫光.
评估PP4C在低氧下使用稳定转染细胞系的肝脂积累机制.
在体内研究比较不同饮食和高度 (低氧) 条件下的小鼠的代谢参数和蛋白质表达.

主要成果:

高海拔 (4500米) 的高脂肪饮食 (HFD) 与较低海拔 (2200米) 的HFD相比,导致较低的体重,甘油三,总胆固醇,ALT,AST和脂质积累.
在低氧 (4500 m) 下,与正常饮食 (ND) 组相比,在HFD中观察到PP4C和ACC1水平的降低,以及HIF2α,pAUF1和CPT1的增加.
HIF2α倒置阻止了缺氧诱导的PP4C减少,表明一个HIF2α-PP4C调节轴. PP4C调节的AUF1酸化,影响脂质积累.

结论:

缺氧可以通过通过HIF2α通路下调PP4C来改善肝脂积累.
PP4C通过调节在不同氧度下AUF1酸化,在肝脂代谢中起着至关重要的作用.
PP4C成为解决MAFLD中肝脂积累的潜在治疗标.

关键词:

富含AU元素的RNA结合因子1 肝脏脂质代谢肝脏脂质代谢氧气过低是因为缺氧.低氧诱导因子2α 蛋白酸酶4C是一种蛋白质酸酶.

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