A novel role for IFN-stimulated gene factor 3II in IFN-γ signaling and induction of antiviral activity in human cells.

A novel role for IFN-stimulated gene factor 3II in IFN-γ signaling and induction of antiviral activity in human cells.
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DOI:
10.4049/jimmunol.1001359
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发表时间:
2011-02-01
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
Zoon KC
Zoon KC
中科院分区:
其他
文献类型:
--
作者:
Morrow AN;Schmeisser H;Tsuno T;Zoon KC

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I 型干扰素(例如 IFN-α、IFN-β)和 II 型干扰素 (IFN-γ) 具有抗病毒、抗增殖和免疫调节特性。两种类型的 IFN 信号均通过 Jak/STAT 途径引发抗病毒活性,但 IFN-γ 被认为仅通过 STAT1 同二聚体发挥作用,而 I 型 IFN 则激活包含 STAT1 和 STAT2 的复合物,例如 IFN 刺激的基因因子 3。在这项研究中,我们表明,含有未磷酸化 STAT2 (ISGF3II) 的 IFN 刺激的基因因子 3 也在 IFN-γ 介导的抗病毒中发挥作用。在人类中的活动。使用磷酸化 STAT1 作为 IFN 信号传导的标记物,对 IFN-α2a 处理的人 A549 细胞进行蛋白质印迹分析,结果显示磷酸化 STAT1 (Y701) 水平在 1 小时内达到峰值,随后下降 6 小时,并在长达 48 小时内保持在低水平。用 IFN-γ 处理的细胞显示出双相磷酸化 STAT1 反应,早期峰值出现在 1-2 小时,第二个峰值出现在 15-24 小时。 IFN-γ处理24小时后的基因表达微阵列表明抗病毒基因的诱导,这些基因由IFN刺激的基因因子3诱导并与I型IFN反应相关。在生物测定和定量 RT-PCR 中使用这些 IFN 的中和抗体排除了自分泌 I 型和 III 型 IFN 信号传导对这些基因的诱导。尽管不存在自分泌 IFN,IFN-γ 治疗仍诱导 ISGF3II 的形成。这种新型转录因子复合物与 IFN 刺激的反应元件启动子序列结合,如蛋白激酶 R 启动子的染色质免疫沉淀分析所示。 A549 细胞中 STAT2 和 IFN 调节因子 9 的敲低逆转了 IFN-γ 介导的 IFN 刺激的反应元件诱导和抗病毒活性,表明 ISGF3II 的形成是 IFN-γ 细胞反应和生物活性的重要组成部分。
Type I (e.g., IFN-α, IFN-β) and type II IFNs (IFN-γ) have antiviral, antiproliferative, and immunomodulatory properties. Both types of IFN signal through the Jak/STAT pathway to elicit antiviral activity, yet IFN-γ is thought to do so only through STAT1 homodimers, whereas type I IFNs activate both STAT1- and STAT2-containing complexes such as IFN-stimulated gene factor 3. In this study, we show that IFN-stimulated gene factor 3 containing unphosphorylated STAT2 (ISGF3II) also plays a role in IFN-γ–mediated antiviral activity in humans. Using phosphorylated STAT1 as a marker for IFN signaling, Western blot analysis of IFN-α2a–treated human A549 cells revealed that phospho-STAT1 (Y701) levels peaked at 1 h, decreased by 6 h, and remained at low levels for up to 48 h. Cells treated with IFN-γ showed a biphasic phospho-STAT1 response with an early peak at 1–2 h and a second peak at 15–24 h. Gene expression microarray following IFN-γ treatment for 24 h indicated an induction of antiviral genes that are induced by IFN-stimulated gene factor 3 and associated with a type I IFN response. Induction of these genes by autocrine type I and type III IFN signaling was ruled out using neutralizing Abs to these IFNs in biological assays and by quantitative RT-PCR. Despite the absence of autocrine IFNs, IFN-γ treatment induced formation of ISGF3II. This novel transcription factor complex binds to IFN-stimulated response element promoter sequences, as shown by chromatin immunoprecipitation analysis of the protein kinase R promoter. STAT2 and IFN regulatory factor 9 knockdown in A549 cells reversed IFN-γ–mediated IFN-stimulated response element induction and antiviral activity, implicating ISGF3II formation as a significant component of the cellular response and biological activity of IFN-γ.
DOI: 10.1073/pnas.0903487106
发表时间: 2009-06-09
影响因子: 11.1
作者:
Cheon, HyeonJoo;Stark, George R.
通讯作者: Stark, George R.
DOI: 10.1046/j.1365-2443.1996.870287.x
发表时间: 1996-11-01
期刊: GENES TO CELLS
影响因子: 2.1
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DOI: 10.1128/mcb.11.10.5147
发表时间: 1991-10-01
影响因子: 5.3
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DOI: 10.1128/mcb.11.1.182
发表时间: 1991-01-01
影响因子: 5.3
作者:
LEW, DJ;DECKER, T;DARNELL, JE
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DOI: 10.1073/pnas.87.21.8555
发表时间: 1990-11-01
影响因子: 11.1
作者:
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通讯作者: DARNELL, JE