Rit GTPase regulates a p38 MAPK-dependent neuronal survival pathway.

Rit GTPase regulates a p38 MAPK-dependent neuronal survival pathway.
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RIT GTPase调节p38 MAPK依赖性神经元存活途径。

DOI:
10.1016/j.neulet.2012.10.036
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发表时间:
2012-12-07
影响因子:
2.5
通讯作者:
Andres DA
Andres DA
中科院分区:
医学4区
文献类型:
--
作者:
Cai W;Rudolph JL;Sengoku T;Andres DA

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Rit 与 Rin 和果蝇 Ric 一起构成 Ras 相关小 GTP 酶的 Rit 亚家族。尽管许多 Ras 家族 GTP 酶的细胞功能已得到充分证实,但 Rit 的生理意义仍知之甚少。 Rit 的缺失使多种哺乳动物细胞系和源自 Rit−/− 小鼠的小鼠胚胎成纤维细胞 (MEF) 对氧化应激介导的细胞凋亡敏感。然而,Rit 介导的促生存信号传导是否延伸到其他细胞类型,特别是神经元,目前尚不清楚。在这里,为了检查这些问题,我们生成了一种转基因小鼠,该小鼠在突触蛋白 I 启动子的控制下仅在神经元中过度表达组成型活性 Rit (RitQ79L)。表达活性 Rit 的海马神经元表现出氧化应激抵抗力的显着增强。此外,药理学抑制剂研究表明,Rit 介导的保护需要 p38 MAPK,而不是 MEK/ERK 信号级联。总之,目前的研究确定了 Rit-p38 MAPK 信号级联在促进氧化应激后海马神经元存活中的关键作用。
Rit, along with Rin and Drosophila Ric, comprises the Rit subfamily of Ras-related small GTPases. Although the cellular functions of many Ras family GTPases are well established, the physiological significance of Rit remains poorly understood. Loss of Rit sensitizes multiple mammalian cell lines and mouse embryonic fibroblasts (MEFs) derived from Rit−/− mice to oxidative stress-mediated apoptosis. However, whether Rit-mediated pro-survival signaling extends to other cell types, particularly neurons, is presently unknown. Here, to examine these issues we generated a transgenic mouse overexpressing constitutively active Rit (RitQ79L) exclusively in neurons, under control of the Synapsin I promoter. Active Rit-expressing hippocampal neurons display a dramatic increase in oxidative stress resistance. Moreover, pharmacological inhibitor studies demonstrate that p38 MAPK, rather than a MEK/ERK signaling cascade, is required for Rit-mediated protection. Together, the present studies identify a critical role for the Rit-p38 MAPK signaling cascade in promoting hippocampal neuron survival following oxidative stress.
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