Nonautonomous regulation of neuronal migration by insulin signaling, DAF-16/FOXO, and PAK-1.

Nonautonomous regulation of neuronal migration by insulin signaling, DAF-16/FOXO, and PAK-1.
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DOI:
10.1016/j.celrep.2013.07.045
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发表时间:
2013-09-12
期刊:
影响因子:
8.8
通讯作者:
Grishok A
Grishok A
中科院分区:
生物学1区
文献类型:
--
作者:
Kennedy LM;Pham SC;Grishok A

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神经元迁移对所有生物体的神经系统发育至关重要,在线虫(秀丽隐杆线虫)中,它受到在人类中保守的信号通路的调控。在此,我们证明胰岛素/胰岛素样生长因子1 - 磷脂酰肌醇 - 3 - 激酶(Insulin/IGF - 1 - PI3K)信号通路调节DAF - 16/FOXO转录因子的活性,以促进秀丽隐杆线虫胚胎发生过程中雌雄同体特异性神经元(HSNs)的向前迁移。当信号减弱时,DAF - 16被激活并促进迁移;相反,当信号增强时,DAF - 16失活且迁移被抑制。我们表明DAF - 16在皮下组织中非自主地发挥作用以促进HSN迁移。此外,我们确定PAK - 1(一种p21激活的激酶)是胰岛素/IGF - 1 - DAF - 16信号在HSN迁移的非自主控制中的下游介质。由于最近发现FOXO - Pak1通路可调节哺乳动物神经元极性,我们的研究结果表明FOXO和Pak1在神经元迁移中的作用可能从秀丽隐杆线虫到高等生物都是保守的。
Neuronal migration is essential for nervous system development in all organisms and is regulated in the nematode, C. elegans, by signaling pathways that are conserved in humans. Here, we demonstrate that the Insulin/IGF-1-PI3K signaling pathway modulates the activity of the DAF-16/FOXO transcription factor to promote the anterior migrations of the hermaphrodite-specific neurons (HSNs) during embryogenesis of C. elegans. When signaling is reduced, DAF-16 is activated and promotes migration, conversely, when signaling is enhanced, DAF-16 is inactivated and migration is inhibited. We show that DAF-16 acts non-autonomously in the hypodermis to promote HSN migration. Furthermore, we identify PAK-1, a p21-activated kinase, as a downstream mediator of Insulin/IGF-1-DAF-16 signaling in the non-autonomous control of HSN migration. As a FOXO-Pak1 pathway was recently shown to regulate mammalian neuronal polarity, our findings indicate that the roles of FOXO and Pak1 in neuronal migration are likely conserved from C. elegans to higher organisms.
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