Exocytosis of post-Golgi vesicles is regulated by components of the endocytic machinery.

Exocytosis of post-Golgi vesicles is regulated by components of the endocytic machinery.
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DOI:
10.1016/j.cell.2009.04.064
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发表时间:
2009-06-26
期刊:
影响因子:
64.5
通讯作者:
Simon SM
Simon SM
中科院分区:
生物学1区
文献类型:
--
作者:
Jaiswal JK;Rivera VM;Simon SM

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高尔基体后囊泡靶向并将大多数生物合成货物递送至细胞表面。然而,在哺乳动物细胞中,这些囊泡的融合所涉及的分子和机制并不清楚。我们采用了一个系统,同时监测释放的管腔和膜生物合成货物从个人后高尔基体囊泡。这些囊泡的胞吐不是钙触发的,并且可以导致膜货物的完全、部分或不释放。融合囊泡的膜货物部分释放或不释放是与“吻就跑”胞吐相关的命运,并且是后高尔基囊泡胞吐的主要模式。部分货物释放后高尔基体囊泡发生由于过早关闭的融合孔,并调制网格蛋白,肌动蛋白和发动蛋白的活性。我们的研究结果表明,内吞机制的组成部分调节的性质和程度的分泌的生物合成的货物,通过影响融合后高尔基体囊泡的细胞膜。
Post-Golgi vesicles target and deliver most biosynthetic cargoes to the cell surface. However, the molecules and mechanism involved in fusion of these vesicles is not well understood in mammalian cells. We have employed a system to simultaneously monitor release of luminal and membrane biosynthetic cargoes from individual post-Golgi vesicles. Exocytosis of these vesicles is not calcium-triggered and can result in complete, partial or no release of membrane cargo. Partial or no release of membrane cargo of a fusing vesicle are fates associated with kiss-and-run exocytosis and are the predominant mode of post-Golgi vesicle exocytosis. Partial cargo release by post-Golgi vesicles occurs due to premature closure of the fusion pore and is modulated by the activity of clathrin, actin and dynamin. Our results demonstrate that the components of the endocytic machinery modulate the nature and extent of secretion of biosynthetic cargo by affecting fusion of post-Golgi vesicles to the cell membrane.
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