Concentric zones of active RhoA and Cdc42 around single cell wounds.

Concentric zones of active RhoA and Cdc42 around single cell wounds.
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DOI:
10.1083/jcb.200411109
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发表时间:
2005-01-31
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Bement WM
Bement WM
中科院分区:
其他
文献类型:
--
作者:
Benink HA;Bement WM

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Rho GTPases 控制许多细胞骨架依赖性过程,但人们对它们如何调节单个细胞内细胞骨架功能的空间独特特征知之甚少。在这里,我们研究了受伤爪蟾卵母细胞中的活性 RhoA 和 Cdc42,它们在伤口周围组装并闭合肌动蛋白丝 (F-肌动蛋白) 和肌球蛋白-2 的动态环。 RhoA 和 Cdc42 以钙依赖性方式在伤口部位周围快速激活,并在伤口周围分离成不同的同心区域,其中活性 Cdc42 位于 F-肌动蛋白阵列的大约中间,活性 RhoA 位于阵列内部。这些区域在 F-肌动蛋白积累之前形成,然后与闭合阵列一致移动。微管和 F-肌动蛋白是正常区域组织和动力学所必需的,RhoA 和 Cdc42 之间的串扰也是如此。每个区域对肌动球蛋白伤口阵列的组织和功能都有不同的贡献。我们提出类似的 rho 活性区控制相关过程,例如胞质分裂。
Rho GTPases control many cytoskeleton-dependent processes, but how they regulate spatially distinct features of cytoskeletal function within a single cell is poorly understood. Here, we studied active RhoA and Cdc42 in wounded Xenopus oocytes, which assemble and close a dynamic ring of actin filaments (F-actin) and myosin-2 around wound sites. RhoA and Cdc42 are rapidly activated around wound sites in a calcium-dependent manner and segregate into distinct, concentric zones around the wound, with active Cdc42 in the approximate middle of the F-actin array and active RhoA on the interior of the array. These zones form before F-actin accumulation, and then move in concert with the closing array. Microtubules and F-actin are required for normal zone organization and dynamics, as is crosstalk between RhoA and Cdc42. Each of the zones makes distinct contributions to the organization and function of the actomyosin wound array. We propose that similar rho activity zones control related processes such as cytokinesis.
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