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.
复制标题
DOI:
10.4049/jimmunol.1001359
复制
发表时间:
2011-02-01
期刊:
影响因子:
--
通讯作者:
Zoon KC
中科院分区:
文献类型:
--
作者:
Morrow AN;Schmeisser H;Tsuno T;Zoon KC
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.
登录
查看更多内容
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.
影响因子:
2.1
作者:
Harada, H;Matsumoto, M;Taniguchi, T
通讯作者:
Taniguchi, T
影响因子:
5.3
作者:
DECKER, T;LEW, DJ;DARNELL, JE
通讯作者:
DARNELL, JE
影响因子:
5.3
作者:
LEW, DJ;DECKER, T;DARNELL, JE
通讯作者:
DARNELL, JE
DOI:
10.1073/pnas.87.21.8555
发表时间:
1990-11-01
影响因子:
11.1
作者:
FU, XY;KESSLER, DS;DARNELL, JE
通讯作者:
DARNELL, JE