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通过信号化脂质转化对溶酶体功能进行营养调节

Michael Ebner¹, Dmytro Puchkov¹, Orestes López-Ortega²

¹Leibniz-Forschungsinstitut für Molekulare Pharmakologie (FMP), 13125 Berlin, Germany.

|October 26, 2023

概括

细胞使用溶解体进行生长和分解,但营养素如何控制这一点尚不清楚. 这项研究揭示了一种感知营养的脂质开关, 控制了溶酶体的运动和功能, 这对于细胞适应至关重要.

科学领域:

细胞生物学
分子生物学
生物化学

背景情况:

溶解体具有双重作用:合成生长信号和催化性大分子循环.
通过营养状况来调节这些对立的溶酶体功能是不太了解的.
了解溶酶体调节是细胞适应和代谢信号的关键.

研究的目的:

根据营养的可用性,研究控制溶酶体形态和功能的调节机制.
阐明信号脂质在溶解体相关的合成和代谢活动中扮演的角色.
了解溶解体如何在信号和降解状态之间切换.

主要方法:

使用活细胞成像研究溶酶体形态和运动性.
分析了因营养缺乏而发生的溶解体表面蛋白质变化.
在溶酶体上研究了酸的新陈代谢,特别是PI(4) P和PI(3) P.
评估了干扰PI(3) P/PI(4) P脂质切换对细胞适应反应的影响.

主要成果:

溶酶体的形态和功能由营养调节的脂质开关可逆控制.
饥饿会诱导外围的,运动的mTORC1信号溶解体转化为静态的,细胞中心聚集的降解溶解体.
酸4-酸 (PI(4) 的代谢重塑了 lysosomal 表面,促进了蛋白质分解和抑制了 mTORC1 的信号传递.
在饥饿过程中清除了 lysosomal phosphatidylinositol 3-phosphate (PI(3) P,与运动和信号损失相关.

结论:

lysosomal 酸代谢对于重新连接器官膜动态至关重要.
一个PI(3) P/PI(4) P脂质开关控制了基于营养状况的溶酶体重新定位和功能.
这种机制对于细胞对不断变化的营养环境的适应反应至关重要.

关键词:

消化过程功能蛋白质组学活相对应光和电子显微镜溶解体在 mTOR 管氨酸营养信号营养成分化物

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