WASP-Arp2/3-dependent actin polymerization influences fusogen localization during cell-cell fusion in Caenorhabditiselegans embryos.

WASP-Arp2/3-dependent actin polymerization influences fusogen localization during cell-cell fusion in Caenorhabditiselegans embryos.
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WASP-Arp2/3依赖性肌动蛋白聚合影响秀丽隐杆线虫胚胎细胞间融合过程中融合原的定位

DOI:
10.1242/bio.026807
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发表时间:
2017-09-15
期刊:
影响因子:
2.4
通讯作者:
Ou G
Ou G
中科院分区:
生物学4区
文献类型:
--
作者:
Zhang Y;Yang Y;Zhu Z;Ou G

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摘要细胞间融合是发育和生理所必需的。肌动蛋白聚合与秀丽隐杆线虫融合子EFF-1在重组果蝇细胞培养系统中的接合有关,肌动蛋白结合蛋白spectraplakin将EFF-1连接到肌动蛋白细胞骨架并促进C.线虫幼虫然而,目前还不清楚融合子和肌动蛋白细胞骨架是否以及如何在C。线虫胚胎在这里,我们使用GFP基因敲入和RNAi胚胎的实时成像分析来研究C.优美的我们的研究结果表明,WASP-Arp 2/3依赖的肌动蛋白聚合的抑制延迟细胞-细胞融合。EFF-1主要分布在胚胎融合细胞的胞内囊泡中,我们发现肌动蛋白聚合的扰动减少了EFF-1阳性囊泡的数量。因此,肌动蛋白细胞骨架不同地促进细胞-细胞融合,通过调节融合子定位到融合质膜在幼虫或细胞内囊泡在胚胎。综述:WASP-Arp 2/3调控融合子定位于C.线虫胚胎我们的研究结果表明,细胞-细胞融合依赖于不同的机制在不同的发展阶段。
ABSTRACT Cell-cell fusion is essential for development and physiology. Actin polymerization was implicated in the Caenorhabditis elegans fusogen EFF-1 engagement in a reconstituted Drosophila cell culture system, and the actin-binding protein spectraplakin links EFF-1 to the actin cytoskeleton and promotes cell-cell fusions in C. elegans larvae. However, it remains unclear whether and how fusogens and the actin cytoskeleton are coordinated in C. elegans embryos. Here, we used live imaging analysis of GFP knock-in and RNAi embryos to study the embryonic cell-cell fusions in C. elegans. Our results show that the inhibition of WASP-Arp2/3-dependent actin polymerization delays cell-cell fusions. EFF-1 is primarily distributed in intracellular vesicles in embryonic fusing cells, and we find that the perturbation of actin polymerization reduces the number of EFF-1-postive vesicles. Thus, the actin cytoskeleton differently promotes cell-cell fusion by regulating fusogen localization to the fusing plasma membrane in larvae or to intracellular vesicles in embryos. Summary: WASP-Arp2/3 regulates fusogen localization to intracellular vesicles in C. elegans embryos. Our results indicate that cell-cell fusions rely on distinct mechanisms at different developmental stages.
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