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FAM134B控制肝星状细胞驱动纤维化中的原I动力学
Jagannath Misra1, Zachary Hanquier2, Reese Baxter3
1Department of Biochemistry and Molecular Biology, Indiana University School of Medicine, Indianapolis, IN, USA.
概括
展开的蛋白质反应 (UPR) 通过控制通过ER-phagy的原I降解来调节肝纤维化. ER-phagy受体FAM134B对于激活的肝星细胞中的原I沉积至关重要.
科学领域:
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
- 胃肠病学 胃肠病学
背景情况:
- 肝纤维化涉及痕组织积累,由激活的肝星细胞 (HSCs) 驱动.
- 展开的蛋白质反应 (UPR) 调节HSC激活和纤维化,但其机制尚不清楚.
- 包括ER-phagy在内的ER-to-lysosome相关降解 (ERLAD) 降解了错误折叠的蛋白质,并与原降解有关.
研究的目的:
- 研究ER-phagy在肝纤维化过程中调节I型原沉积中的作用.
- 阐明 UPR 控制 HSC 中 I 原水平的机制.
主要方法:
- 评估了激活HSC中的原I水平和ER-phagy受体表达.
- 使用了ATF6α依赖的过程和FAM134B删除模型.
- 研究了FAM134B对原I沉积和分泌的影响.
主要成果:
- 原I水平是通过自细胞的翻译后调节,与ER-phagy受体表达相关.
- 高细胞激活会诱导ER-phagy流和FAM134B表达,这取决于ATF6α.
- 删除FAM134B减少了细胞内原I,并阻止了TGFβ诱导的原I沉积.
结论:
- ER-phagy受体FAM134B在肝纤维化过程中对原I沉积起着关键作用.
- FAM134B调解了 I 原的降解,影响了肝纤维化中的细胞外基质积累.
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