Type I interferon response is delayed in human astrovirus infections.

Type I interferon response is delayed in human astrovirus infections.
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DOI:
10.1371/journal.pone.0123087
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发表时间:
2015
期刊:
影响因子:
3.7
通讯作者:
Pintó RM
Pintó RM
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Guix S;Pérez-Bosque A;Miró L;Moretó M;Bosch A;Pintó RM

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I 型干扰素 (IFN) 激活及其后续效应对于病毒感染的反应非常重要。在这里,我们发现人类星状病毒(HAstV)是儿童急性胃肠炎的重要病原体,在感染 CaCo-2 细胞后会诱导轻微且延迟的 IFN 反应。尽管在受感染的细胞内检测到 IFN-β mRNA,并且受感染细胞的上清液对其他众所周知的 IFN 敏感病毒的复制表现出抗病毒活性,但一旦基因组复制发生,这些反应就会发生在感染的后期。另一方面,添加外源IFN可部分减少HAstV复制,并且BX795抑制IFN激活可增强病毒复制,表明HAstV是IFN敏感病毒。最后,在感染不同 HAstV 突变体的细胞中观察到不同水平的 IFN 反应,并且 nsP1a/4 高变区发生变化,这表明 nsP1a/4 基因型可能具有临床意义,因为它与病毒复制表型和感染细胞内诱导的抗病毒反应相关。
Type I interferon (IFN) activation and its subsequent effects are important in the response to viral infections. Here we show that human astroviruses (HAstVs), which are important agents of acute gastroenteritis in children, induce a mild and delayed IFN response upon infecting CaCo-2 cells. Although IFN-β mRNA is detected within infected cells and supernatant from infected cells show antiviral activity against the replication of other well-known IFN-sensitive viruses, these responses occur at late stages of infection once genome replication has taken place. On the other hand, HAstV replication can be partially reduced by the addition of exogenous IFN, and inhibition of IFN activation by BX795 enhances viral replication, indicating that HAstVs are IFN-sensitive viruses. Finally, different levels of IFN response were observed in cells infected with different HAstV mutants with changes in the hypervariable region of nsP1a/4, suggesting that nsP1a/4 genotype may potentially have clinical implications due to its correlation with the viral replication phenotype and the antiviral responses induced within infected cells.
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