PKD controls αvβ3 integrin recycling and tumor cell invasive migration through its substrate Rabaptin-5.

PKD controls αvβ3 integrin recycling and tumor cell invasive migration through its substrate Rabaptin-5.
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DOI:
10.1016/j.devcel.2012.08.008
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发表时间:
2012-09-11
期刊:
影响因子:
11.8
通讯作者:
Toker, Alex
Toker, Alex
中科院分区:
生物学1区
文献类型:
--
作者:
Christoforides, Claudine;Rainero, Elena;Brown, Kristin K.;Norman, Jim C.;Toker, Alex

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整合素再循环对于细胞迁移至关重要。蛋白激酶D(PKD)介导来自血小板衍生生长因子受体(PDGF-R)的信号以控制αvβ3整联蛋白再循环。我们现在表明,Rabaptin-5,Rab 5效应器内体膜融合,是PKD底物。PKD使Rabaptin-5在Ser 407处磷酸化,这对于αvβ3的PDGF依赖性短环再循环是必要和充分的,这反过来抑制α5β1整联蛋白再循环。Rab 4(而非Rab 5)与磷酸化Rabaptin-5相互作用,朝向迁移细胞的前部,以促进αvβ3向前缘的递送,从而驱动依赖于该整合素的持续细胞运动和侵袭。一致地,Rabaptin-5 Ser 407磷酸化的破坏减少了2D和αvβ3依赖性侵袭中的持续细胞迁移。相反,依赖于α5β1整联蛋白的侵袭性迁移通过破坏Rabaptin磷酸化而促进。这些发现表明PKD途径通过Rabaptin-5磷酸化将受体酪氨酸激酶信号传导与整联蛋白开关偶联。
Integrin recycling is critical for cell migration. Protein Kinase D (PKD) mediates signals from the platelet-derived growth factor-receptor (PDGF-R) to control αvβ3 integrin recycling. We now show that Rabaptin-5, a Rab5 effector in endosomal membrane fusion, is a PKD substrate. PKD phosphorylates Rabaptin-5 at Ser407 and this is both necessary and sufficient for PDGF-dependent short-loop recycling of αvβ3, which in turn inhibits α5β1 integrin recycling. Rab4, but not Rab5, interacts with phosphorylated Rabaptin-5 toward the front of migrating cells to promote delivery of αvβ3 to the leading edge, thereby driving persistent cell motility and invasion that is dependent on this integrin. Consistently, disruption of Rabaptin-5 Ser407 phosphorylation reduces persistent cell migration in 2D and αvβ3-dependent invasion. Conversely, invasive migration that is dependent on α5β1 integrin is promoted by disrupting Rabaptin phosphorylation. These findings demonstrate that the PKD pathway couples receptor tyrosine kinase signaling to an integrin switch, via Rabaptin-5 phosphorylation.
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