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. 1995 Oct;15(10):5258–5267. doi: 10.1128/mcb.15.10.5258

Regulation of interleukin 12 p40 expression through an NF-kappa B half-site.

T L Murphy 1, M G Cleveland 1, P Kulesza 1, J Magram 1, K M Murphy 1
PMCID: PMC230773  PMID: 7565674

Abstract

Interleukin 12 (IL-12) is an inducible cytokine composed of 35- and 40-kDa subunits that is critical for promoting T helper type 1 development and cell-mediated immunity against pathogens. The 40-kDa subunit, expressed by activated macrophages and B cells, is induced by several pathogens in vivo and in vitro and is augmented or inhibited by gamma interferon (IFN-gamma) or IL-10, respectively. Control of IL-12 p40 expression is therefore important for understanding resistance and susceptibility to a variety of pathogens, including Leishmania major and perhaps human immunodeficiency virus. In this report, we provide the first characterization of IL-12 p40 gene regulation in macrophages. We localize inducible activity of the promoter to the sequence -122GGGGAATTTTA-132 not previously recognized to bind Rel family transcription factors. We demonstrate binding of this sequence to NF-kappa B (p50/p65 and p50/c-Rel) complexes in macrophages activated by several p40-inducing pathogens and provide functional data to support a role for NF-kappa B family members in IL-12 p40 activation. Finally, we find that IFN-gamma treatment of cells enhances this binding interaction, thus potentially providing a mechanism for IFN-gamma augmentation of IL-12 production by macrophages.

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Selected References

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