Vesicles and actin are targeted to the cleavage furrow via furrow microtubules and the central spindle.

Vesicles and actin are targeted to the cleavage furrow via furrow microtubules and the central spindle.
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囊泡和肌动蛋白通过沟微管和中央纺锤体靶向卵裂沟。

DOI:
10.1083/jcb.200803096
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发表时间:
2008-06-02
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Sullivan W
Sullivan W
中科院分区:
其他
文献类型:
--
作者:
Albertson R;Cao J;Hsieh TS;Sullivan W

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在胞质分裂过程中,卵裂沟内陷需要肌动球蛋白为基础的收缩环和新膜的加入。关于肌动蛋白和膜如何运输到卵裂沟,我们知之甚少。我们通过对果蝇黑腹果蝇细胞后胚胎中荧光标记的囊泡进行活分析来解决这个问题。我们发现,在细胞质分裂过程中,F-肌动蛋白和膜作为一个单位,通过形成与F-肌动蛋白相关的小泡来内陷皱纹。F-肌动蛋白斑点蛋白与内体小泡强烈共定位,但不与高尔基体来源的小泡共定位。这些小泡被招募到沿着中央纺锤体的卵裂沟和与沟缘接触的独特的微管(MT)群(沟MT)。我们发现Rho特异的鸟苷核苷酸交换因子突变体Pebble(PBL)严重破坏了这种F-肌动蛋白相关的囊泡运输。这些运输缺陷是PBL突变体不能正确形成沟槽MT和中心纺锤体的结果。因此,F-肌动蛋白相关小泡在肌动蛋白和中央纺锤体上的运输是肌动蛋白和膜被运送到卵裂沟的重要机制。
During cytokinesis, cleavage furrow invagination requires an actomyosin-based contractile ring and addition of new membrane. Little is known about how this actin and membrane traffic to the cleavage furrow. We address this through live analysis of fluorescently tagged vesicles in postcellularized Drosophila melanogaster embryos. We find that during cytokinesis, F-actin and membrane are targeted as a unit to invaginating furrows through formation of F-actin–associated vesicles. F-actin puncta strongly colocalize with endosomal, but not Golgi-derived, vesicles. These vesicles are recruited to the cleavage furrow along the central spindle and a distinct population of microtubules (MTs) in contact with the leading furrow edge (furrow MTs). We find that Rho-specific guanine nucleotide exchange factor mutants, pebble (pbl), severely disrupt this F-actin–associated vesicle transport. These transport defects are a consequence of the pbl mutants' inability to properly form furrow MTs and the central spindle. Transport of F-actin–associated vesicles on furrow MTs and the central spindle is thus an important mechanism by which actin and membrane are delivered to the cleavage furrow.
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