Cofilin promotes stimulus-induced lamellipodium formation by generating an abundant supply of actin monomers.

Cofilin promotes stimulus-induced lamellipodium formation by generating an abundant supply of actin monomers.
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DOI:
10.1083/jcb.200610005
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发表时间:
2007-05-07
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Mizuno K
Mizuno K
中科院分区:
其他
文献类型:
--
作者:
Kiuchi T;Ohashi K;Kurita S;Mizuno K

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Cofilin刺激肌动蛋白细丝分解,加速肌动蛋白细丝周转。Cofilin也参与了刺激诱导的肌动蛋白细丝组装过程。然而,目前还不清楚这是通过补充肌动蛋白单体池,通过细丝分解,还是通过其切断活性创造自由的带刺末端来实现的。利用可光激活的Dronpa-肌动蛋白,我们证明了cofilin参与了超过一半的细胞质肌动蛋白单体的产生,并且肌动蛋白单体掺入片层肌动蛋白顶端的速度取决于这个肌动蛋白单体池的大小。最后,在Cofilin耗竭的细胞中,刺激诱导的肌动蛋白单体在细胞外围的掺入会减弱,但显微注射的肌动蛋白单体的掺入不会减弱。我们认为,cofilin通过提供丰富的细胞质肌动蛋白单体,促进了刺激诱导的肌动蛋白细丝组装和片状肌动蛋白的延伸。
Cofilin stimulates actin filament disassembly and accelerates actin filament turnover. Cofilin is also involved in stimulus-induced actin filament assembly during lamellipodium formation. However, it is not clear whether this occurs by replenishing the actin monomer pool, through filament disassembly, or by creating free barbed ends, through its severing activity. Using photoactivatable Dronpa-actin, we show that cofilin is involved in producing more than half of all cytoplasmic actin monomers and that the rate of actin monomer incorporation into the tip of the lamellipodium is dependent on the size of this actin monomer pool. Finally, in cofilin-depleted cells, stimulus-induced actin monomer incorporation at the cell periphery is attenuated, but the incorporation of microinjected actin monomers is not. We propose that cofilin contributes to stimulus-induced actin filament assembly and lamellipodium extension by supplying an abundant pool of cytoplasmic actin monomers.
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