Measles virus suppresses RIG-I-like receptor activation in dendritic cells via DC-SIGN-mediated inhibition of PP1 phosphatases.

Measles virus suppresses RIG-I-like receptor activation in dendritic cells via DC-SIGN-mediated inhibition of PP1 phosphatases.
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DOI:
10.1016/j.chom.2014.06.008
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发表时间:
2014-07-09
影响因子:
30.3
通讯作者:
Geijtenbeek TB
Geijtenbeek TB
中科院分区:
医学1区
文献类型:
--
作者:
Mesman AW;Zijlstra-Willems EM;Kaptein TM;de Swart RL;Davis ME;Ludlow M;Duprex WP;Gack MU;Gringhuis SI;Geijtenbeek TB

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麻疹病毒(MV)是高度传染性的,并且感染树突状细胞(DC)用于病毒传播。DC表达RIG-I样受体(RLR)RIG-I和Mda 5,其感测MV以诱导抗病毒I型干扰素(IFN)应答。RIG-I和Mda 5通过PP 1磷酸酶的去磷酸化是其活化所必需的。在这里,我们证明了MV通过DC-SIGN信号转导抑制RIG-I和Mda 5去磷酸化。MV与DC-SIGN的结合导致激酶Raf-1的活化,其诱导PP 1抑制剂I-1与GADD 34-PP 1全酶的缔合,从而抑制磷酸酶活性。结果,GADD 34-PP 1全酶不能使RIG-1和Mda 5去磷酸化,因此抑制I型IFN应答并增强MV复制。干扰DC-SIGN信号传导允许激活RLR,随后抑制DC的MV感染。因此,MV破坏DC-SIGN信号传导,导致控制RIG-I和Mda 5活化的PP 1磷酸酶的抑制,这可能被其他病毒用来逃避抗病毒反应。
Measles virus (MV) is highly infectious and infects dendritic cells (DCs) for viral dissemination. DCs express RIG-I-like receptors (RLRs) RIG-I and Mda5 that sense MV to induce antiviral type I interferon (IFN) responses. Dephosphorylation of RIG-I and Mda5 by PP1 phosphatases is required for their activation. Here we demonstrate that MV suppresses RIG-I and Mda5 dephosphorylation via DC-SIGN signaling. MV binding to DC-SIGN leads to activation of kinase Raf-1, which induced association of the PP1 inhibitor I-1 with GADD34-PP1 holoenzymes, thereby inhibiting the phosphatase activity. As a result, GADD34-PP1 holoenzymes were unable to dephosphorylate RIG-I and Mda5, hence suppressing type I IFN responses and enhancing MV replication. Interference with DC-SIGN signaling allowed activation of RLRs and subsequently suppressed MV infection of DCs. Thus, MV subverts DC-SIGN signaling, leading to inhibition of PP1 phosphatases that control RIG-I and Mda5 activation, which might be used by other viruses to escape antiviral responses.
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