ADAR1 enhances HTLV-1 and HTLV-2 replication through inhibition of PKR activity.

ADAR1 enhances HTLV-1 and HTLV-2 replication through inhibition of PKR activity.
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DOI:
10.1186/s12977-014-0093-9
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发表时间:
2014-11-12
期刊:
影响因子:
3.3
通讯作者:
Mahieux R
Mahieux R
中科院分区:
医学2区
文献类型:
--
作者:
Cachat A;Alais S;Chevalier SA;Journo C;Fusil F;Dutartre H;Boniface A;Ko NL;Gessain A;Cosset FL;Suspène R;Vartanian JP;Mahieux R

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一般先天免疫和 I 型干扰素 (IFN-I) 在 HTLV-1 发病机制中的作用仍然存在争议。 ADAR1-p150 是一种由 IFN-I 诱导的干扰素刺激基因 (ISG),可以编辑病毒 RNA。因此我们研究了它是否可以发挥抗HTLV因子的作用。我们在这里证明,在没有 IFN 刺激的情况下,ADAR1 也在激活的初级 T 淋巴细胞(该病毒的天然靶标)以及 HTLV-1 或 HTLV-2 慢性感染的 T 细胞中表达。从 HTLV-1 感染个体获得的原代淋巴细胞中 ADAR1 表达也增加。我们证明 ADAR1 增强 T 淋巴细胞中的 HTLV-1 和 HTLV-2 感染,并且这种前病毒效应与其编辑活性无关。 ADAR1 表达抑制 IFN-α 对 HTLV-1 和 HTLV-2 的抑制作用,并通过抑制 PKR 磷酸化发挥作用。这项研究表明,两个干扰素刺激的基因,即 PKR 和 ADAR1 对 HTLV 体内复制具有相反的作用。这些蛋白质的平衡表达可以决定感染过程中病毒周期的命运。本文的在线版本 (doi:10.1186/s12977-014-0093-9) 包含补充材料,可供授权用户使用。
The role of innate immunity in general and of type I interferon (IFN-I) in particular in HTLV-1 pathogenesis is still a matter of debate. ADAR1-p150 is an Interferon Stimulated Gene (ISG) induced by IFN-I that can edit viral RNAs. We therefore investigated whether it could play the role of an anti-HTLV factor. We demonstrate here that ADAR1 is also expressed in the absence of IFN stimulation in activated primary T-lymphocytes that are the natural target of this virus and in HTLV-1 or HTLV-2 chronically infected T-cells. ADAR1 expression is also increased in primary lymphocytes obtained from HTLV-1 infected individuals. We show that ADAR1 enhances HTLV-1 and HTLV-2 infection in T-lymphocytes and that this proviral effect is independent from its editing activity. ADAR1 expression suppresses IFN-α inhibitory effect on HTLV-1 and HTLV-2 and acts through the repression of PKR phosphorylation. This study demonstrates that two interferon stimulated genes, i.e. PKR and ADAR1 have opposite effects on HTLV replication in vivo. The balanced expression of those proteins could determine the fate of the viral cycle in the course of infection. The online version of this article (doi:10.1186/s12977-014-0093-9) contains supplementary material, which is available to authorized users.
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