导致脂肪肝疾病的蛋白质PNPLA3-I148M改变了脂质滴滴-戈尔吉动态
David J Sherman1, Lei Liu2, Jennifer L Mamrosh1
1Amgen Research, Thousand Oaks, CA 91320.
概括
与代谢功能障碍相关的脂肪性肝病 (MASLD) 最强的遗传风险因素,PNPLA3-I148M,不是ER蛋白. 它与戈尔吉器官相关联,驱动细胞变化和肝细胞中的脂质积累.
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
- 遗传学 遗传学 是一个
背景情况:
- 代谢功能障碍相关的脂肪性肝病 (MASLD) 是一种与甘油三积累相关的渐进性肝病.
- 一种常见的PNPLA3基因变异 (PNPLA3-I148M) 是MASLD的主要遗传风险因素.
- 关于PNPLA3和与疾病相关的PNPLA3-I148M变体的确切功能仍然基本上是未知的.
研究的目的:
- 研究PNPLA3和PNPLA3-I148M变体的细胞内定位和功能.
- 描述由内源性表达PNPLA3-I148M引起的细胞变化.
- 建立一个细胞模型来研究MASLD中的PNPLA3-I148M.
主要方法:
- 在内源水平上表达PNPLA3和PNPLA3-I148M的同源性人类肝瘤细胞.
- 分裂细胞溶解物以确定细胞内蛋白质的关联.
- 进行蛋白质组和转录组分析以评估细胞变化.
- 检查了表达I148M变异的初级人类患者肝细胞.
主要成果:
- PNPLA3 和 PNPLA3-I148M 不是内细胞网膜内存的跨膜蛋白质.
- 这两种蛋白质都局限于脂质滴,戈尔吉和内体隔间,与类酸盐相关联.
- PNPLA3-I148M表达诱导了戈尔吉器官的形态变化和脂肪滴-戈尔吉接触的增加.
- PNPLA3-I148M表达导致显著的蛋白质和转录基因变化,反映了肝病的进展.
结论:
- 戈尔吉装置是PNPLA3-I148M活动的关键细胞部位.
- 内源PNPLA3-I148M表达驱动与MASLD相关的细胞变化和脂质积累.
- 开发的细胞系统为MASLD中PNPLA3-I148M的进一步研究提供了一个平台.
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