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首页> 外文期刊>Journal of Cellular Physiology >Alpha-Catulin Co-Localizes With Vimentin Intermediate Filaments and Functions in Pulmonary Vascular Endothelial Cell Migration via ROCK
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Alpha-Catulin Co-Localizes With Vimentin Intermediate Filaments and Functions in Pulmonary Vascular Endothelial Cell Migration via ROCK

机译:中间丝和肺功能通过岩石血管内皮细胞迁移

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The ubiquitous alpha-catulin acts as a scaffold for distinct signalosomes including RhoA/ROCK; however, its function is not well understood. While alpha-catulin has homology to the cytoskeletal linkers alpha-catenin and vinculin, it appears to be functionally divergent. Here we further investigated alpha-catulin function in pulmonary vascular endothelial cells (VEC) on the premise that alpha-catulin has a unique cytoskeletal role. Examination of endogenous alpha-catulin intracellular localization by immunofluorescence revealed a highly organized cytosolic filamentous network suggestive of a cytoskeletal system in a variety of cultured VEC. Double-immunofluorescence analyses of VEC showed endogenous alpha-catulin co-localization with vimentin intermediate filaments. Similar to vimentin, alpha-catulin was found to distribute into detergent-soluble and -insoluble fractions. Treatment of VEC with withaferinA, an agent that targets vimentin filaments, disrupted the alpha-catulin network distribution and altered alpha-catulin solubility. Vimentin participates in cell migration, and withaferinA was found to inhibit VEC migration in vitro; similarly, alpha-catulin knock-down reduced VEC migration. Based on previous reports showing that ROCK modulates vimentin, we found that ROCK depletion attenuated VEC migration; furthermore, alpha-catulin depletion was shown to reduce ROCK-induced signaling. These findings indicate that alpha-catulin has a unique function in co-localization with vimentin filaments that contributes to VEC migration via a pathway that may involve ROCK signaling. (C) 2015 Wiley Periodicals, Inc.
机译:无处不在的alpha-catulin充当支架等不同的signalosomes RhoA /岩石;然而,它的功能还不是很清楚。尽管alpha-catulin同源性alpha-catenin和vinculin细胞骨架连接基团,它似乎是功能不同。进一步研究了alpha-catulin函数肺血管内皮细胞(VEC)前提是alpha-catulin独特细胞骨架的作用。alpha-catulin细胞内定位的免疫荧光显示一个高度有组织的胞质丝状网络的暗示在各种培养VEC细胞骨架系统。Double-immunofluorescence VEC显示分析内源性alpha-catulin co-localization与波形蛋白中间丝。波形蛋白,发现alpha-catulin分发detergent-soluble和不溶性分数。VEC withaferinA,治疗一个代理目标波形蛋白细丝,扰乱了alpha-catulin网络分布和改变alpha-catulin溶解度。在细胞迁移和withaferinA被发现VEC迁移抑制体外;alpha-catulin降低减少VEC迁移。基于先前的报道显示,岩石调节波形蛋白,我们发现岩石损耗减毒VEC迁移;alpha-catulin损耗减少ROCK-induced信号。alpha-catulin有独特的功能co-localization与波形蛋白细丝VEC迁移有助于通过通路可能涉及岩石信号。期刊、公司。

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