溶酶体LRRC8复合体对溶酶体pH,形态和全身葡萄糖代谢产生影响
Ashutosh Kumar1, Yonghui Zhao1, Litao Xie1
1Department of Internal Medicine, Cardiovascular Division, Washington University School of Medicine, St. Louis, MO, USA.
Science advances
|September 26, 2025
概括
溶酶体上富含白的重复含有8 (LRRC8) 通道复合体调节细胞生长和新陈代谢. 破坏LRRC8A会损害 lysosomal 功能,导致胰岛素抵抗和改变小鼠的葡萄糖代谢.
科学领域:
- 细胞生物学 细胞生物学
- 代谢信号传递 代谢信号传递
- 分子机制的分子机制
背景情况:
- 溶解体将营养感应与像PI3K-AKT-mTOR这样的合成信号通路相结合.
- 氨酸丰富的重复含有8 (LRRC8) 通道复合体是一种溶酶体阴离子通道,涉及到细胞生长和新陈代谢.
研究的目的:
- 定义内源LRRC8亚单元在溶酶体功能和代谢调节中的作用.
- 为了研究LRRC8A功能障碍对骨肌肉和全身葡萄糖平衡的影响.
主要方法:
- 内生LRRC8亚单元在分化髓管中的定位.
- 在肌管和敲进小鼠中对LRRC8A突变 (LRRC8A-L706A;L707A) 的功能分析.
- 评估溶酶体参数 (大小,数量,pH,蛋白质表达) 和PI3K-AKT-mTOR信号通路.
主要成果:
- LRRC8A调节了白刺激的mTOR信号传递,溶酶体形态,pH和蛋白质表达 (LAMP2,P62,LC3B).
- 一个关键的LRRC8A基因的突变使LRRC8A淘汰细胞中观察到的溶酶体和信号缺陷重现.
- LRRC8A-L706A;L707A 敲进小鼠显示增加脂肪,降低葡萄糖耐受性和胰岛素抵抗.
结论:
- lysosomal LRRC8A 在调节 lysosomal 功能和代谢信号传递方面发挥着至关重要的作用.
- LRRC8A对于维持全身葡萄糖平衡和胰岛素敏感性至关重要.
- 向溶酶体LRRC8通道可能为代谢障碍提供治疗策略.
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