Essential role of CIB1 in regulating PAK1 activation and cell migration.

Essential role of CIB1 in regulating PAK1 activation and cell migration.
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DOI:
10.1083/jcb.200502090
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发表时间:
2005-08-01
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Parise LV
Parise LV
中科院分区:
其他
文献类型:
--
作者:
Leisner TM;Liu M;Jaffer ZM;Chernoff J;Parise LV

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p21激活激酶(PAKs)调节许多细胞过程,包括细胞骨架重排和细胞迁移。在这项研究中,我们报告了PAK1与22 kD的Ca2+结合蛋白CIB 1的直接和特异性相互作用,这导致PAK1在体外和体内的激活。CIB1以钙依赖性方式在抑制性开关结构域周围的离散区域内与PAK1结合,提供了CIB1诱导的PAK1活化的潜在机制。CIB1过表达显著降低了纤连蛋白上的细胞迁移,这是由于PAK1和LIM激酶依赖性的cofilin磷酸化增加。相反,RNA干扰介导的CIB1耗竭增加了细胞迁移,并减少了正常粘附诱导的PAK1活化和cofilin磷酸化。总之,这些结果表明,内源性CIB1所需的调节粘附诱导的PAK1激活,并优先诱导PAK1依赖性途径,可以负调节细胞迁移。这些结果表明CIB1是PAK1激活和信号传导的关键调节因子。
p21-activated kinases (PAKs) regulate many cellular processes, including cytoskeletal rearrangement and cell migration. In this study, we report a direct and specific interaction of PAK1 with a 22-kD Ca2+-binding protein, CIB1, which results in PAK1 activation both in vitro and in vivo. CIB1 binds to PAK1 within discrete regions surrounding the inhibitory switch domain in a calcium-dependent manner, providing a potential mechanism of CIB1-induced PAK1 activation. CIB1 overexpression significantly decreases cell migration on fibronectin as a result of a PAK1-and LIM kinase–dependent increase in cofilin phosphorylation. Conversely, the RNA interference–mediated depletion of CIB1 increases cell migration and reduces normal adhesion-induced PAK1 activation and cofilin phosphorylation. Together, these results demonstrate that endogenous CIB1 is required for regulated adhesion-induced PAK1 activation and preferentially induces a PAK1-dependent pathway that can negatively regulate cell migration. These results point to CIB1 as a key regulator of PAK1 activation and signaling.
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