Phosphorylation of actopaxin regulates cell spreading and migration.

Phosphorylation of actopaxin regulates cell spreading and migration.
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DOI:
10.1083/jcb.200404024
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发表时间:
2004-09-13
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Turner CE
Turner CE
中科院分区:
其他
文献类型:
--
作者:
Clarke DM;Brown MC;LaLonde DP;Turner CE

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Actopaxin是一种肌动蛋白和桩蛋白结合蛋白,定位于粘着斑。它调节细胞伸展并在有丝分裂期间被磷酸化。在此,我们确定了actopaxin磷酸化在细胞扩散和迁移中的作用。开发了表达actopaxin野生型(WT)、非磷酸化和磷酸化模拟突变体的U2 OS细胞的稳定克隆,以评价actopaxin功能。所有蛋白质都靶向粘着斑,然而,nonphosphorylatable突变体抑制扩散,而拟磷酸化突变体细胞比WT细胞更有效地扩散。内源性和野生型actopaxin,但不是nonphosphorylatable突变体,在体内细胞粘附/扩散过程中磷酸化。nonphosphorylatable actopaxin突变体的表达显着降低细胞迁移,而磷酸模拟物的表达增加刮伤和Boyden室迁移试验中的细胞迁移。体外激酶试验表明,细胞外信号调节蛋白激酶磷酸化actopaxin,和治疗的U2 OS细胞与MEK 1抑制剂UO 126抑制粘附诱导的磷酸化actopaxin,也抑制细胞迁移。
Actopaxin is an actin and paxillin binding protein that localizes to focal adhesions. It regulates cell spreading and is phosphorylated during mitosis. Herein, we identify a role for actopaxin phosphorylation in cell spreading and migration. Stable clones of U2OS cells expressing actopaxin wild-type (WT), nonphosphorylatable, and phosphomimetic mutants were developed to evaluate actopaxin function. All proteins targeted to focal adhesions, however the nonphosphorylatable mutant inhibited spreading whereas the phosphomimetic mutant cells spread more efficiently than WT cells. Endogenous and WT actopaxin, but not the nonphosphorylatable mutant, were phosphorylated in vivo during cell adhesion/spreading. Expression of the nonphosphorylatable actopaxin mutant significantly reduced cell migration, whereas expression of the phosphomimetic increased cell migration in scrape wound and Boyden chamber migration assays. In vitro kinase assays demonstrate that extracellular signal-regulated protein kinase phosphorylates actopaxin, and treatment of U2OS cells with the MEK1 inhibitor UO126 inhibited adhesion-induced phosphorylation of actopaxin and also inhibited cell migration.
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影响因子: --
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