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首页> 外文期刊>The FEBS journal >Constitutively active alpha subunits of G(q/11) and G(12/13) families inhibit activation of the pro-survival Akt signaling cascade
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Constitutively active alpha subunits of G(q/11) and G(12/13) families inhibit activation of the pro-survival Akt signaling cascade

机译:G(q / 11)和G(12/13)家族的组成型活性α亚单位抑制生存前Akt信号级联反应的激活

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Accumulating evidence indicates that G protein signaling plays an active role in the regulation of cell survival. Our previous study demonstrated the regulatory effects of G(i/o) proteins in nerve growth factor-induced activation of pro-survival Akt kinase. In the present study we explored the role of various members of the G(s), G(q/11) and G(12/13) subfamilies in the regulation of Akt in cultured mammalian cells. In human embryonic kidney 293 cells transiently expressing constitutively active mutants of G alpha(11), G alpha(14), G alpha(16), G alpha(12), or G alpha(13) (G alpha(11)QL, G alpha(14)QL, G alpha(16)QL, G alpha(12)QL and G alpha(13)QL, respectively), basal phosphorylation of Akt was attenuated, as revealed by western blotting analysis using a phosphospecific anti-Akt immunoglobulin. In contrast, basal Akt phosphorylation was unaffected by the overexpression of a constitutively active G alpha(s) mutant (G alpha(s)QL). Additional experiments showed that G alpha(11)QL, G alpha(14)QL, G alpha(16)QL, G alpha(12)QL and G alpha(13)QL, but not G alpha(s)QL, attenuated phosphorylation of the Akt-regulated translation regulator tuberin. Moreover, they were able to inhibit the epidermal growth factor-induced Akt activation and tuberin phosphorylation. The inhibitory mechanism of G(q) family members was independent of phospholipase C beta activation and calcium signaling because G alpha(11)QL, G alpha(14)QL and G alpha(16)QL remained capable of inhibiting epidermal growth factor-induced Akt activation in cells pretreated with U73122 and the intracellular calcium chelator, BAPTA/AM. Finally, overexpression of the dominant negative mutant of RhoA blocked G alpha(12)QL- and G alpha(13)QL-mediated inhibition, suggesting that activated G alpha(12) and G alpha(13) inhibit Akt signaling via RhoA. Collectively, this study demonstrated the inhibitory effect of activated G alpha(11), G alpha(14), G alpha(16), G alpha(12) and G alpha(13) on pro-survival Akt signaling.
机译:越来越多的证据表明,G蛋白信号传导在细胞存活的调节中起着积极的作用。我们先前的研究证明了G(i / o)蛋白在神经生长因子诱导的前生存性Akt激酶激活中的调节作用。在本研究中,我们探讨了G(s),G(q / 11)和G(12/13)亚家族的各个成员在哺乳动物细胞Akt调控中的作用。在人类胚胎肾脏293细胞中,瞬时表达G alpha(11),G alpha(14),G alpha(16),G alpha(12)或G alpha(13)(G alpha(11)QL, G alpha(14)QL,G alpha(16)QL,G alpha(12)QL和G alpha(13)QL))减弱了Akt的基础磷酸化,如使用磷酸特异性抗Akt的蛋白质印迹分析所揭示的那样免疫球蛋白。相反,基础Akt磷酸化不受组成型活性G alpha(s)QL(G alpha)的过表达的影响。其他实验显示,G alpha(11)QL,G alpha(14)QL,G alpha(16)QL,G alpha(12)QL和G alpha(13)QL(但不是G alpha(s)QL)减弱了磷酸化作用Akt调节的翻译调节蛋白此外,它们能够抑制表皮生长因子诱导的Akt激活和结核菌素磷酸化。 G(q)家族成员的抑制机制独立于磷脂酶C beta激活和钙信号传导,因为G alpha(11)QL,G alpha(14)QL和G alpha(16)QL仍然能够抑制表皮生长因子诱导用U73122和细胞内钙螯合剂BAPTA / AM预处理的细胞中的Akt活化。最后,RhoA的显性负突变体的过表达阻断了G alpha(12)QL-和G alpha(13)QL介导的抑制作用,表明激活的G alpha(12)和G alpha(13)抑制了通过RhoA的Akt信号传导。总的来说,这项研究表明激活的G alpha(11),G alpha(14),G alpha(16),G alpha(12)和G alpha(13)对存活的Akt信号的抑制作用。

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