Double-stranded RNAs containing multiple IU pairs are sufficient to suppress interferon induction and apoptosis.

Double-stranded RNAs containing multiple IU pairs are sufficient to suppress interferon induction and apoptosis.
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DOI:
10.1038/nsmb.1864
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发表时间:
2010-09
影响因子:
16.8
通讯作者:
--
中科院分区:
生物学1区
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作用于RNA的腺苷脱氨酶(ADAR)催化长dsRNA的超编辑,由此高达50%的腺苷转化为肌苷(I)。虽然超编辑的dsRNA(IU-dsRNA)已经参与了各种细胞功能,但我们现在提供的证据表明了一种新的作用。我们发现IU-dsRNA抑制干扰素刺激基因(ISGs)的诱导和对poly(IC)的凋亡反应。此外,我们证明IU-dsRNA抑制IRF 3的激活,这对于诱导ISG和凋亡是必不可少的。最后,我们推测IRF 3抑制是由于IU-dsRNA与MDA-5或RIG-I(poly(IC)的胞质传感器)的特异性结合所致。虽然我们的数据与先前的研究一致,其中ADAR 1缺失导致ISGs表达增加和细胞凋亡,但我们表明IU-dsRNA本身抑制ISGs和细胞凋亡。因此,我们认为ADAR 1产生的任何IU-dsRNA都可以抑制这两种途径。
Adenosine deaminases acting on RNA (ADARs) catalyse hyper-editing of long dsRNAs, whereby up to 50% of adenosines are converted to inosine (I). While hyper-edited dsRNAs (IU-dsRNAs) have been implicated in various cellular functions, we now provide evidence suggesting a novel role. We show that IU-dsRNA suppresses induction of interferon-stimulated genes (ISGs) and apoptosis in response to poly(IC). Moreover, we demonstrate that IU-dsRNA inhibits activation of IRF3, which is essential for induction of ISGs and apoptosis. Finally, we speculate that IRF3 inhibition results from specific binding of IU-dsRNA to MDA-5 or RIG-I, cytosolic sensors for poly(IC). While our data are consistent with a previous study in which ADAR1 deletion resulted in increased expression of ISGs and apoptosis, we show that IU-dsRNA per se suppresses ISGs and apoptosis. We therefore propose that any IU-dsRNA generated by ADAR1 can inhibit both pathways.
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