MEKK3 is required for lysophosphatidic acid-induced NF-kappaB activation.

MEKK3 is required for lysophosphatidic acid-induced NF-kappaB activation.
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DOI:
10.1016/j.cellsig.2009.05.007
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发表时间:
2009-10
影响因子:
4.8
通讯作者:
Yang J
Yang J
中科院分区:
生物学2区
文献类型:
--
作者:
Sun W;Li H;Yu Y;Fan Y;Grabiner BC;Mao R;Ge N;Zhang H;Fu S;Lin X;Yang J

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溶血磷脂酸(LPA)是一种有效的激动剂,通过与其同源G蛋白偶联受体(GPCR)结合,对许多细胞类型发挥各种细胞功能。尽管LPA通过作用于其GPCR受体而诱导NF-κB活化,但LPA受体介导NF-κB活化的分子机制仍有待明确。在本研究中,通过使用MEKK 3-、TAK 1-和IKKβ-缺陷的鼠胚胎成纤维细胞(MEFs),我们发现MEKK 3而不是TAK 1缺陷损害LPA和蛋白激酶C(PKC)诱导的IκB激酶(IKK)-NF-κB激活,并且IKKβ是PKC诱导的NF-κB激活所必需的。此外,我们证明,LPA和PKC诱导的IL-6和MIP-2的生产被废除的情况下MEKK 3,但不TAK 1。总之,我们的结果提供了MEKK 3而不是TAK 1是LPA受体介导的IKK-NF-κB激活所必需的遗传证据。
Lysophosphatidic acid (LPA) is a potent agonist that exerts various cellular functions on many cell types through binding to its cognate G protein-coupled receptors (GPCRs). Although LPA induces NF-κB activation by acting on its GPCR receptor, the molecular mechanism of LPA receptor-mediated NF-κB activation remains to be well defined. In the present study, by using MEKK3-, TAK1-, and IKKβ-deficient murine embryonic fibroblasts (MEFs), we found that MEKK3 but not TAK1 deficiency impairs LPA and protein kinase C (PKC)-induced IκB kinase (IKK)-NF-κB activation, and IKKβ is required for PKC-induced NF-κB activation. In addition, we demonstrate that LPA and PKC-induced IL-6 and MIP-2 production are abolished in the absence of MEKK3 but not TAK1. Together, our results provide the genetic evidence that MEKK3 but not TAK1 is required for LPA receptor-mediated IKK-NF-κB activation.
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