一个自我感应的真空细胞/溶酶体:V-ATPase功能障碍激活了选择性自细胞
Yuxiang Huang1, Daniel J Klionsky1
1Life Sciences Institute and Department of Molecular, Cellular and Developmental Biology, University of Michigan, Ann Arbor, MI, USA.
Autophagy
|December 19, 2025
概括
丢失真空类型的H+转位ATPase (V-ATPase) 活性,矛盾地诱导了酵母体的自. 这种依赖V-ATPase的自细胞作为反循环,信号真空管功能障碍恢复细胞平衡.
科学领域:
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
- 生物化学 生化学
背景情况:
- 自通常依赖于由真空类型的H+转位ATPase (V-ATPase) 维持的真空酸度.
- V-ATPase主要被视为一种对溶酶体降解至关重要的质子.
- 现有的研究假设V-ATPase抑制剂是自流动的中性标志物.
研究的目的:
- 研究V-ATPase活性在调节自的作用.
- 挑战V-ATPase功能在细胞降解中的既定范式.
- 探索参与V-ATPase调节的自的信号通路.
主要方法:
- 使用*Saccharomyces cerevisiae* (酵母菌) 作为一个模型生物体.
- 在V-ATPase抑制或功能障碍的条件下研究了自诱导.
- 分析了涉及Gcn2-Gcn4/ATF4综合应激反应的信号级联.
- 研究了Atg11在V-ATPase依赖的自和 рибо中的作用.
- 评估了酸盐和NAD+代谢对自诱导的影响.
主要成果:
- 矛盾的是,V-ATPase活动的丧失会诱导营养补充酵母的选择性自,特别是 ribofagy.
- 空腔脱酸会触发Gcn2-Gcn4/ATF4综合应激反应,甚至在TORC1活跃时也会驱动自.
- 这种依赖V-ATPase的自功能作为反机制来信号真空功能障碍并恢复平衡.
- 发现三和NAD+代谢能调节这种自反应.
- 抑制V-ATPase可以刺激自诱导,挑战其作为中性流量标记物的使用.
结论:
- V-ATPase不仅仅是一个质子,而且是细胞完整性的活跃传感器和自的调节器.
- 依赖V-ATPase的自代表了一种新的自我纠正反循环,用于维持细胞平衡.
- 这些发现需要在自研究中对V-ATPase抑制剂进行重新评估.
- 这项研究将真空细胞/溶酶体的作用从被动降解部位重新定义为活跃的细胞信号中心.
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