RhoA activation participates in rearrangement of processing bodies and release of nucleated AU-rich mRNAs.

RhoA activation participates in rearrangement of processing bodies and release of nucleated AU-rich mRNAs.
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DOI:
10.1093/nar/gkq1302
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发表时间:
2011-04
影响因子:
14.9
通讯作者:
Katada T
Katada T
中科院分区:
生物学2区
文献类型:
--
作者:
Takahashi S;Sakurai K;Ebihara A;Kajiho H;Saito K;Kontani K;Nishina H;Katada T

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细胞质核糖核蛋白颗粒,被称为加工体(p体),含有一组共同的保守rna加工酶,含有富au元素(AREs)的mrna被递送到p体进行翻译沉默。尽管p小体的动力学与细胞骨架网络有物理联系,但尚不清楚小gtpase如何参与p小体调节和are - mrna代谢。我们在这里发现,葡萄糖消耗激活RhoA GTPase并改变HeLa细胞的p体动力学。这些葡萄糖消耗效应通过RhoA亚家族gtpase的过度表达再现,相反,通过抑制RhoA激活而消除。有趣的是,RhoA激活和葡萄糖消耗都抑制mRNA的积累和降解。这些发现表明RhoA参与了应力诱导的p -小体重排和有核are - mrna的释放以稳定它们。
Cytoplasmic ribonucleoprotein granules, known as processing bodies (P-bodies), contain a common set of conserved RNA-processing enzymes, and mRNAs with AU-rich elements (AREs) are delivered to P-bodies for translational silencing. Although the dynamics of P-bodies is physically linked to cytoskeletal network, it is unclear how small GTPases are involved in the P-body regulation and the ARE-mRNA metabolism. We found here that glucose depletion activates RhoA GTPase and alters the P-body dynamics in HeLa cells. These glucose-depleted effects are reproduced by the overexpression of the RhoA-subfamily GTPases and conversely abolished by the inhibition of RhoA activation. Interestingly, both RhoA activation and glucose depletion inhibit the mRNA accumulation and degradation. These findings indicate that RhoA participates in the stress-induced rearrangement of P-bodies and the release of nucleated ARE-mRNAs for their stabilization.
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