A kinase cascade leading to Rab11-FIP5 controls transcytosis of the polymeric immunoglobulin receptor.

A kinase cascade leading to Rab11-FIP5 controls transcytosis of the polymeric immunoglobulin receptor.
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DOI:
10.1038/ncb2118
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发表时间:
2010-12
影响因子:
21.3
通讯作者:
Mostov, Keith E.
Mostov, Keith E.
中科院分区:
生物学1区
文献类型:
--
作者:
Su, Tao;Bryant, David M.;Luton, Frederic;Verges, Marcel;Ulrich, Scott M.;Hansen, Kirk C.;Datta, Anirban;Eastburn, Dennis J.;Burlingame, Alma L.;Shokat, Kevan M.;Mostov, Keith E.

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聚合免疫球蛋白A (pIgA)胞吞作用是由聚合免疫球蛋白受体(pIgR)介导的,是粘膜免疫的核心组成部分,也是极化上皮膜运输调节的模型。pIgA与pIgR的结合刺激胞吞作用,这一过程需要Src家族酪氨酸激酶(SFK)。我们发现Yes直接磷酸化肝内体上的EGF受体(EGFR)。大鼠注射pIgA诱导EGFR磷酸化。同样,在MDCK细胞中,pIgA处理显著增加了EGFR在不同位点的磷酸化,随后激活细胞外信号调节蛋白激酶(ERK)。此外,我们发现Rab11效应物Rab11- fip5是ERK的底物。敲除Yes或Rab11-FIP5,或抑制Yes - egfr - erk级联,可减少pIgA-pIgR的胞吞作用。最后,我们证明了ERK对Rab11-FIP5的磷酸化控制Rab11a内体分布和pIgA-pIgR的转胞作用。我们的研究结果揭示了一个新的Yes-EGFR-ERK-FIP5信号网络,用于调节pIgA-pIgR的胞吞作用。
Polymeric immunoglobulin A (pIgA) transcytosis, mediated by the polymeric immunoglobulin receptor (pIgR), is a central component of mucosal immunity and a model for regulation of polarized epithelial membrane traffic. Binding of pIgA to pIgR stimulates transcytosis in a process requiring Yes, a Src family tyrosine kinase (SFK). We show that Yes directly phosphorylates EGF receptor (EGFR) on liver endosomes. Injection of pIgA into rats induced EGFR phosphorylation. Similarly, in MDCK cells, pIgA treatment significantly increased phosphorylation of EGFR on various sites, subsequently activating extracellular signal-regulated protein kinase (ERK). Furthermore, we find that the Rab11 effector Rab11-FIP5 is a substrate of ERK. Knocking down Yes or Rab11-FIP5, or inhibition of the Yes–EGFR–ERK cascade, decreased pIgA–pIgR transcytosis. Finally, we demonstrate that Rab11-FIP5 phosphorylation by ERK controls Rab11a endosome distribution and pIgA–pIgR transcytosis. Our results reveal a novel Yes–EGFR–ERK–FIP5 signalling network for regulation of pIgA–pIgR transcytosis.
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