Unphosphorylated STAT3 regulates the antiproliferative, antiviral, and gene-inducing actions of type I interferons.

Unphosphorylated STAT3 regulates the antiproliferative, antiviral, and gene-inducing actions of type I interferons.
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DOI:
10.1016/j.bbrc.2017.06.111
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发表时间:
2017-08-26
影响因子:
3.1
通讯作者:
Pfeffer LM
Pfeffer LM
中科院分区:
生物学4区
文献类型:
--
作者:
Pfeffer SR;Fan M;Du Z;Yang CH;Pfeffer LM

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I型干扰素(IFNα/β)通过诱导IFN刺激基因(ISG)在细胞中诱导抗病毒和抗增殖应答。虽然IFN-活化的STAT 1和STAT 2在IFN应答中的作用已被充分描述,但STAT 3的功能特征很差。我们研究了STAT 3在小鼠胚胎成纤维细胞(MEFs)中对IFNα/β的生物学反应中的作用,该细胞具有STAT 3的生殖系缺失。这些STAT 3敲除(STAT 3-KO)MEF用STAT 3或其中典型的Y 705酪氨酸磷酸化位点突变的F705-STAT 3突变体(未磷酸化的STAT 3)重建。我们发现,STAT 3和非磷酸化STAT 3的表达增强MEFs的抗病毒,抗增殖和基因诱导IFN的作用的敏感性。通过染色质免疫沉淀分析,未磷酸化的STAT 3似乎结合,尽管很弱,选择基因启动子,以增强其表达。这些结果表明,未磷酸化的STAT 3在IFN应答途径中起重要作用。
Type I interferon (IFNα/β) induces antiviral and antiproliferative responses in cells through the induction of IFN-stimulated genes (ISGs). Although the roles of IFN-activated STAT1 and STAT2 in the IFN response are well described, the function of STAT3 is poorly characterized. We investigated the role of STAT3 in the biological response to IFNα/β in mouse embryonic fibroblasts (MEFs) with a germ line deletion of STAT3. These STAT3 knockout (STAT3-KO) MEFs were reconstituted with STAT3 or the F705-STAT3 mutant (unphosphorylated STAT3) where the canonical Y705 tyrosine phosphorylation site was mutated. We show that both STAT3 and unphosphorylated STAT3 expression enhance the sensitivity of MEFs to the antiviral, antiproliferative and gene-inducing actions of IFN. By chromatin immunoprecipitation assays, unphosphorylated STAT3 appears to bind, albeit weakly, to select gene promoters to enhance their expression. These results suggest that unphosphorylated STAT3 plays an important role in the IFN response pathway.
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