Type I PIPK-alpha regulates directed cell migration by modulating Rac1 plasma membrane targeting and activation.
Type I PIPK-alpha regulates directed cell migration by modulating Rac1 plasma membrane targeting and activation.
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DOI:
10.1083/jcb.200911110
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发表时间:
2010-07-26
期刊:
影响因子:
--
通讯作者:
Kunz J
中科院分区:
文献类型:
--
作者:
Chao WT;Daquinag AC;Ashcroft F;Kunz J
PIPKI-α does a job other PIPKI isoforms cannot; it recruits Rac1 to the plasma membrane upon integrin activation, spatially regulating the actin-organizing GTPase during migration. Phosphatidylinositol-4,5-bisphosphate (PI4,5P2) is a critical regulator of cell migration, but the roles of the type I phosphatidylinositol-4-phosphate 5-kinases (PIPKIs), which synthesize PI4,5P2, have yet to be fully defined in this process. In this study, we report that one kinase, PIPKI-α, is a novel upstream regulator of Rac1 that links activated integrins to the regulation of cell migration. We show that PIPKI-α controls integrin-induced translocation of Rac1 to the plasma membrane and thereby regulates Rac1 activation. Strikingly, this function is not shared with other PIPKI isoforms, is independent of catalytic activity, and requires physical interaction of PIPKI-α with the Rac1 polybasic domain. Consistent with its role in Rac1 activation, depletion of PIPKI-α causes pronounced defects in membrane ruffling, actin organization, and focal adhesion formation, and ultimately affects the directional persistence of migration. Thus, our study defines the role of PIPKI-α in cell migration and describes a new mechanism for the spatial regulation of Rac1 activity that is critical for cell migration.
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影响因子:
9.2
作者:
Hansen, MDH;Nelson, WJ
通讯作者:
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DOI:
10.1126/stke.2002.125.pl3
发表时间:
2002-03-26
期刊:
Science's STKE : signal transduction knowledge environment
影响因子:
--
作者:
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通讯作者:
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影响因子:
4.8
作者:
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