通过Ip3r-Grp75-Vdac复合体来调节ER-线粒体接触部位的肝脂发生,并通过Seipin进行招募
Ying-Jia Chi1, Zhen-Yu Bai1, Guang-Li Feng1
1Key Laboratory of Freshwater Animal Breeding, Ministry of Agriculture, Fishery College, Huazhong Agricultural University, Wuhan, 430070, China.
线粒体和内分泌网膜接触部位 (MERCS) 通过招募Seipin来调节肝中性脂质合成,这种过程取决于Ca2+信号,而不是MERCS的结构完整性. 这些发现是从鱼类到哺乳动物保存的.
科学领域:
- 细胞生物学 细胞生物学
- 脂质代谢 脂质代谢是什么
- 有机通信机构 通信机构
背景情况:
- 线粒体和内分泌网膜接触部位 (MERCS) 对于肝脂稳定至关重要.
- 在肝中性脂质合成中MERCS的确切作用在很大程度上是未知的.
研究的目的:
- 研究MERCS在棕酸引起的肝脏中性脂质失衡中的作用和机制.
- 阐明参与MERCS介导的脂质调节的信号通路.
主要方法:
- 使用黄色鱼构建了一个脂质代谢动物模型.
- 利用在体外实验中与与si-mitochondrial calcium uniporter (si-mcu) 转染的孤立肝细胞进行实验,以研究MERCS介导的Ca2+信号传递.
- 进行了肝细胞MERCS亚蛋白质组分析.
主要成果:
- 过度摄入棕酸通过激活Ip3r-Grp75电压依赖离子通道 (Vdac) 综合体,增强了肝脏MERCS.
- MERCS招募了Seipin,促进了脂质滴生物发生,并导致中性脂质沉积.
- 在MERCS中控制肝脂质稳定包括通过IP3r-Grp75-Vdac介导的Ca2+信号,独立于MERCS结构完整性的Seipin招募.
- 在鱼类和哺乳动物中确定了保存机制.
结论:
- 由MERCS招募的Seipin通过Ip3r-Grp75-Vdac复合体介导的Ca2+信号调节肝脏脂质合成.
- 在维持肝脂质平衡中,MERCS发挥着至关重要的作用.
- 这些发现为MERCS在脂质代谢中的功能提供了新的见解.
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