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首页> 外文期刊>Cytoskeleton >Arf1 and Arf6 promote ventral actin structures formed by acute activation of protein kinase C and Src
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Arf1 and Arf6 promote ventral actin structures formed by acute activation of protein kinase C and Src

机译:Arf1和Arf6促进由蛋白激酶C和Src的急性激活形成的腹肌动蛋白结构

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摘要

Arf proteins regulate membrane traffic and organelle structure. Although Arf6 is known to initiate actin-based changes in cell surface architecture, Arf1 may also function at the plasma membrane. Here we show that acute activation of protein kinase C (PKC) induced by the phorbol ester PMA led to the formation of motile actin structures on the ventral surface of Beas-2b cells, a lung bronchial epithelial cell line. Ventral actin structures also formed in PMA-treated HeLa cells that had elevated levels of Arf activation. For both cell types, formation of the ventral actin structures was enhanced by expression of active forms of either Arf1 or Arf6 and by the expression of guanine nucleotide exchange factors that activate these Arfs. By contrast, formation of these structures was blocked by inhibitors of PKC and Src and required phosphatidylinositol 4, 5-bisphosphate, Rac, Arf6, and Arf1. Furthermore, expression of ASAP1, an Arf1 GTPase activating protein (GAP) was more effective at inhibiting the ventral actin structures than was ACAP1, an Arf6 GAP. This study adds to the expanding role for Arf1 in the periphery and identifies a requirement for Arf1, a "Golgi Arf," in the reorganization of the cortical actin cytoskeleton on ventral surfaces, against the substratum.
机译:Arf蛋白调节膜运输和细胞器结构。尽管已知Arf6会引发细胞表面结构中基于肌动蛋白的改变,但Arf1也可能在质膜上起作用。在这里,我们显示了佛波酯PMA诱导的蛋白激酶C(PKC)的急性激活导致Beas-2b细胞(一种肺支气管上皮细胞系)的腹表面上形成了运动型肌动蛋白结构。腹肌动蛋白结构也形成于PMA处理的HeLa细胞中,其Arf活化水平升高。对于这两种细胞类型,通过激活形式的Arf1或Arf6的表达以及激活这些Arfs的鸟嘌呤核苷酸交换因子的表达都增强了腹肌动蛋白结构的形成。相比之下,这些结构的形成被PKC和Src抑制剂以及所需的磷脂酰肌醇4、5-双磷酸酯,Rac,Arf6和Arf1阻断。此外,ASAP1(一种Arf1 GTP酶激活蛋白(GAP))的表达比ACAP1(一种Arf6 GAP)更有效地抑制腹肌动蛋白结构。这项研究增加了Arf1在周围的作用,并确定了Arf1(高尔基Arf)在腹侧表面皮层肌动蛋白细胞骨架针对基底的重组中的需求。

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