Microtubules growth rate alteration in human endothelial cells.

Microtubules growth rate alteration in human endothelial cells.
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DOI:
10.1155/2010/671536
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发表时间:
2010
影响因子:
--
通讯作者:
Verin AD
Verin AD
中科院分区:
其他
文献类型:
--
作者:
Alieva IB;Zemskov EA;Kireev II;Gorshkov BA;Wiseman DA;Black SM;Verin AD

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为了了解微管如何促进内皮细胞(EC)细胞骨架的动态重组,我们建立了一个表达EB3-GFP的EC模型,EB3-GFP是一种标记微管正端的蛋白质。使用该模型,我们能够测量单个人EC的中心体区域和细胞周围附近以及EC单层中的微管生长速率。我们证明了EC中的大多数微管是动态的,它们的正端生长速度在细胞质内部,在中心体区域最高。微管正端生长速率由细胞中心向外周递减。我们的数据表明,EC中微管+端生长的局部调控机制存在。单层EC细胞质内微管生长速率低于单层EC,提示细胞间接触的调节作用。单层EC中中心体微管生长速率分布表明存在两个微管亚群,其生长速率为“正常”(与单层EC相似)和“快速”(生长速率为单层EC的三倍)。我们的结果表明细胞-细胞接触和微管之间的功能相互作用。
To understand how microtubules contribute to the dynamic reorganization of the endothelial cell (EC) cytoskeleton, we established an EC model expressing EB3-GFP, a protein that marks microtubule plus-ends. Using this model, we were able to measure microtubule growth rate at the centrosome region and near the cell periphery of a single human EC and in the EC monolayer. We demonstrate that the majority of microtubules in EC are dynamic, the growth rate of their plus-ends is highest in the internal cytoplasm, in the region of the centrosome. Growth rate of microtubule plus-ends decreases from the cell center toward the periphery. Our data suggest the existing mechanism(s) of local regulation of microtubule plus-ends growth in EC. Microtubule growth rate in the internal cytoplasm of EC in the monolayer is lower than that of single EC suggesting the regulatory effect of cell-cell contacts. Centrosomal microtubule growth rate distribution in single EC indicated the presence of two subpopulations of microtubules with “normal” (similar to those in monolayer EC) and “fast” (three times as much) growth rates. Our results indicate functional interactions between cell-cell contacts and microtubules.
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