Poly(ADP-ribosyl)ation enhances HuR oligomerization and contributes to pro-inflammatory gene mRNA stabilization.

Poly(ADP-ribosyl)ation enhances HuR oligomerization and contributes to pro-inflammatory gene mRNA stabilization.
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聚 (ADP-核糖基) 化增强 HuR 寡聚化并有助于促炎基因 mRNA 稳定

DOI:
10.1007/s00018-020-03618-4
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发表时间:
2021-03
期刊:
Cellular and molecular life sciences : CMLS
影响因子:
--
通讯作者:
Ba X
Ba X
中科院分区:
其他
文献类型:
--
作者:
Ke Y;Lv X;Fu X;Zhang J;Bohio AA;Zeng X;Hao W;Wang R;Boldogh I;Ba X

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聚腺苷二磷酸核糖基化是一种重要的翻译后修饰,主要由聚腺苷二磷酸核糖聚合酶1(PARP1)催化。除了在DNA损伤检测和修复中发挥重要作用外,它还在基因表达调控中发挥作用,特别是在转录后水平。胚胎致死性异常视觉样蛋白1/人类抗原R(ELAVL/HUR)是一个典型的富含AU元件的3‘非翻译区结合蛋白,是一种保护靶mRNAs免受RNA破坏蛋白或microRNA诱导的沉默复合体(MiRISC)介导的降解的重要的mRNA稳定蛋白。此外,在某些情况下,HUR本身要么促进翻译,要么抑制翻译。在这里,我们证明了作为对炎症刺激的反应,PARP1使HUR的PAR化(主要位于保守的D226位)增加了HUR寡聚/多聚体的形成,并且HUR寡聚促进了miRISC的解离并稳定了致炎基因mRNAs。防止PARP1激活或HUR寡聚减少内毒素诱导的炎症基因表达和中性粒细胞在小鼠肺内的气道募集。本研究验证了PARP1和HUR PAR化在RNA稳定性调节中的一种新机制,加深了我们对PARP1如何调控基因表达的理解。
Poly(ADP-ribosyl)ation (PARylation) is an important post-translational modification mainly catalyzed by poly-ADP-ribose polymerase 1 (PARP1). In addition to having important roles in DNA damage detection and repair, it functions in gene expression regulation, especially at the posttranscriptional level. Embryonic lethal abnormal vision-like 1/human antigen R (ELAVL/HuR), a canonical 3′ untranslated region AU-rich element-binding protein, is a crucial mRNA-stabilizing protein that protects target mRNAs from RNA-destabilizing protein- or microRNA-induced silencing complex (miRISC)-mediated degradation. Additionally, in some cases, HuR itself either promotes or suppresses translation. Here, we demonstrated that in response to inflammatory stimuli, the PARylation of HuR, mostly at the conserved D226 site, by PARP1 increased the formation of the HuR oligomer/multimer, and HuR oligomerization promoted the disassociation of miRISC and stabilized the pro-inflammatory gene mRNAs. The prevention of PARP1 activation or HuR oligomerization attenuated lipopolysaccharide-induced inflammatory gene expression and the airway recruitment of neutrophils in mouse lungs. The present study verified a novel mechanism of PARP1 and HuR PARylation in the RNA stability regulation, increasing our understanding of how PARP1 regulates gene expression.
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