Gene b IL-1Transcriptional Activation of the Human Proteins Synergize to Mediate PU.1 and Multiple IFN Regulatory Factor
Gene b IL-1Transcriptional Activation of the Human Proteins Synergize to Mediate PU.1 and Multiple IFN Regulatory Factor
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基因 b IL-1 人类蛋白质转录激活协同介导 PU.1 和多种 IFN 调节因子
DOI:
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发表时间:
2001
期刊:
影响因子:
--
通讯作者:
M. D. Liang
中科院分区:
文献类型:
--
作者:
M. Fenton;S. Marecki;C. Riendeau;M. D. Liang
2 Both lymphoid and myeloid cells express two related members of the IFN regulatory factor (IRF) family of transcription factors, specifically IRF-4 and IFN consensus binding protein (ICSBP or IRF-8). We previously reported that macrophages express IRF-4 and in combination with the ETS-like protein PU.1 can synergistically activate a human IL-1 b reporter gene. Here we report that this synergy is mediated by a composite PU.1/IRF element located within an upstream enhancer known to confer cytokine- and LPS-inducible expression. In macrophages, synergistic activation of IL-1 b reporter gene expression was preferentially mediated by IRF-4, whereas IRF-4 and ICSBP were equally capable of synergizing with PU.1 when coexpressed in fibroblasts. Furthermore, coexpression of IRF-1 and IRF-2 dramatically increased the capacity of both PU.1/IRF-4 and PU.1/ICSBP to induce IL-1 b reporter gene expression in fibroblasts. The additional synergy observed with IRF-1 and IRF-2 coexpression is mediated by a region of DNA distinct from either the IL-1 b enhancer or promoter. We also assessed the capacity of these transcription factors to activate endogenous IL-1 b gene when overexpressed in human embryonic kidney 293 cells. Although ectopic expression of PU.1 alone was sufficient to activate modest levels of IL-1 b transcripts, endogenous IL-1 b expression was markedly increased following coexpression of additional IRF proteins. Thus, maximal expression of both a human IL-1 b reporter gene and the endogenous IL-1 b gene was observed in cells that coexpressed PU.1, IRF-4 (or ICSBP), IRF1, and IRF2. Together, our observations suggest that these factors may function together as an enhanceosome. The
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影响因子:
5.6
作者:
Saura, M;Zaragoza, C;Lowenstein, CJ
通讯作者:
Lowenstein, CJ
DOI:
10.1073/pnas.94.1.127
发表时间:
1997-01
影响因子:
11.1
作者:
J. Pongubala;M. Atchison
通讯作者:
J. Pongubala;M. Atchison
影响因子:
4.4
作者:
C. Salkowski;K. Kopydlowski;J. Blanco;M. J. Cody;R. McNally;S. Vogel
通讯作者:
C. Salkowski;K. Kopydlowski;J. Blanco;M. J. Cody;R. McNally;S. Vogel
DOI:
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发表时间:
1991
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
作者:
Donnelly,RP;Fenton,MJ;Kaufman,JD;Gerrard,TL
通讯作者:
Gerrard,TL
影响因子:
56.9
作者:
PONGUBALA, JMR;VANBEVEREN, C;ATCHISON, ML
通讯作者:
ATCHISON, ML