Differential regulation of interleukin (IL)-12 p35 and p40 gene expression and interferon (IFN)-gamma-primed IL-12 production by IFN regulatory factor 1.

Differential regulation of interleukin (IL)-12 p35 and p40 gene expression and interferon (IFN)-gamma-primed IL-12 production by IFN regulatory factor 1.
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IFN调节因子1的白介素(IL)-12 p35和p40基因表达和干扰素(IFN)-Gamma-gamma-gamma-gamma-gamma-gamma-gamma-gamma-gamma-gamma-gamma-gamma-gamma-gamma p35和p40基因表达的差异调节。

DOI:
10.1084/jem.20030026
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发表时间:
2003-10-20
影响因子:
15.3
通讯作者:
Ma, XJ
Ma, XJ
中科院分区:
医学1区
文献类型:
--
作者:
Liu, JG;Cao, SJ;Herman, LM;Ma, XJ

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白细胞介素(IL)-12是一种异二聚体细胞因子,由编码在不同染色体上的p40和p35链组成。两个组成基因的协调表达对于适当的免疫反应在时间、位置和大小上是至关重要的。巨噬细胞产生IL-12的干扰素(IFN)-γ启动是体内细胞对微生物感染反应升级的重要生理过程。我们提供的证据表明,IFN调节因子(IRF)-1缺陷的巨噬细胞在il - 12p35的mRNA合成上有选择性损伤,而不是p40基因,并且在il - 12p70的产生上有强烈缺陷,而不是p40。我们证明了IFN-γ和脂多糖(LPS)刺激il - 12p35蛋白水平与其mRNA水平相对应,并且核因子κB信号通路对于LPS诱导il - 12p35转录至关重要。IRF-1在il - 12p35基因的转录激活中发挥主要作用,但在IFN-γ激活时,IRF-1通过与il - 12p35启动子内的倒置IRF元件物理相互作用,而不是p40基因的转录激活。此外,irf -1介导的p35启动子的转录激活需要两个相邻Sp1元件的合作。因此,IRF-1与lps介导的事件协同作用,在il - 12p35转录的选择性激活中,作为IFN-γ信号的关键组成部分。
Interleukin (IL)-12 is a heterodimeric cytokine consisting of the p40 and p35 chains encoded on separate chromosomes. Coordinated expression of the two constituent genes is crucial for appropriate immune responses in timing, location, and magnitude. Interferon (IFN)-γ priming of IL-12 production by macrophages represents an important physiological process in vivo for escalated cellular response to microbial infections. We provide evidence that IFN regulatory factor (IRF)-1–deficient macrophages have a selective impairment in mRNA synthesis of IL-12 p35 but not the p40 gene, and a strong deficiency in the production of IL-12 p70 but not p40. We demonstrate that the levels of IL-12 p35 protein stimulated by IFN-γ and lipopolysaccharide (LPS) correspond to those of its mRNA, and that the nuclear factor κB signaling pathway is essential for the induction of IL-12 p35 transcription by LPS. IRF-1 plays a major role in the transcriptional activation of the IL-12 p35 gene, but not of the p40 gene, by physically interacting with an inverted IRF element within the IL-12 p35 promoter upon IFN-γ activation. Moreover, IRF-1–mediated transcriptional activation of the p35 promoter requires the cooperation of two adjacent Sp1 elements. Thus, IRF-1 acts as a critical component of IFN-γ signaling in the selective activation of IL-12 p35 transcription in synergy with LPS-mediated events.
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