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HSD17B13 伴侣肝细胞脂质代谢到星状细胞通过TGFb-1信号激活
bioRxiv : the preprint server for biology
|November 24, 2025
概括
在17β-基类固醇脱酶13 (HSD17B13) 中的功能丧失变体保护MASH. 活性HSD17B13通过脂质积累和TGFb-1信号传递促进肝纤维化,驱动肝星细胞激活.
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:
- 代谢功能障碍相关的脂肪肝炎 (MASH) 涉及肝脏脂肪的积累,炎症和纤维化.
- 遗传研究表明,HSD17B13功能丧失的变种可以预防先进的MASH.
- 将HSD17B13与MASH纤维化联系在一起的机制尚不清楚.
研究的目的:
- 研究HSD17B13在MASH病变发生过程中的作用.
- 阐明连接HSD17B13活性与肝纤维化的分子通路.
主要方法:
- 使用培养的人类肝细胞和LX2星状细胞.
- 评估了HSD17B13的定位和活动.
- 测量脂质积累和ChREBP调节.
- 评估了对膜信号,包括TGFb-1诱导.
- 用于TGFb-1的siRNA淘汰和蛋白质中和.
主要成果:
- 具有催化活性的HSD17B13,但不是缺陷突变,局部化到脂质滴.
- 活性HSD17B13增加了肝细胞脂质积累和上调的ChREBP.
- HSD17B13诱导了肝星细胞的强烈膜激活.
- 转化生长因子β-1 (TGFb-1) 受到活性HSD17B13.3的强烈上调.
- 阻断TGFb-1消除了星状细胞的激活和原蛋白的合成.
结论:
- 在MASH中,HSD17B13充当了双重的代谢和益纤维素因子.
- 活跃的HSD17B13通过TGFb-1驱动肝星细胞的激活.
- 这将肝细胞脂质失调与MASH中的纤维化进展联系在一起.
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