Retinoids Inhibit Interleukin-12 Production in Macrophages through Physical Associations of Retinoid X Receptor and NF B

Wistar Institute, Filadelfia, Pennsylvania, United States
Journal of Biological Chemistry (Impact Factor: 4.57). 04/1999; 274(12):7674-80. DOI: 10.1074/jbc.274.12.7674
Source: PubMed


Lipopolysaccharide (LPS) increases the production of interleukin-12 (IL-12) from mouse macrophages via a κB site within the
IL-12 p40 promoter. In this study, we found that retinoids inhibit this LPS-stimulated production of IL-12 in a dose-dependent
manner. The NFκB components p50 and p65 bound retinoid X receptor (RXR) in a ligand-independent manner in vitro, and the interaction interfaces involved the p50 residues 1–245, the p65 residues 194–441, and the N-terminal A/B/C domains
of RXR. Activation of macrophages by LPS resulted in markedly enhanced binding activities to the κB site, which significantly
decreased upon addition of retinoids, as demonstrated by the electrophoretic mobility shift assays. In cotransfections of
CV-1 and HeLa cells, RXR also inhibited the NFκB transactivation in a ligand-dependent manner, whereas a mutant RXR lacking
the AF2 transactivation domain, which serves as ligand-dependent binding sites for transcription integrators SRC-1 and p300,
was without any effect. In addition, coexpression of increasing amounts of SRC-1 or p300 relieved the retinoid-mediated inhibition
of the NFκB transactivation. From these results, we propose that retinoid-mediated suppression of the IL-12 production from
LPS-activated macrophages may involve both inhibition of the NFκB-DNA interactions and competitive recruitment of transcription
integrators between NFκB and RXR.

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