STAT3 regulates NF-kappaB recruitment to the IL-12p40 promoter in dendritic cells.

Blood
F HoentjenChristian Jobin

Abstract

Interleukin-10-deficient (IL-10(-/-)) mice develop an IL-12-mediated intestinal inflammation in the absence of endogenous IL-10. The molecular mechanisms of the dysregulated IL-12 responses in IL-10(-/-) mice are poorly understood. In this study, we investigated the role of nuclear factor-kappa B (NF-kappaB) and signal transducers and activators of transcription 3 (STAT3) in lipopolysaccharide (LPS)-induced IL-12p40 gene expression in bone marrow derived-dendritic cells (BMDCs) isolated from wild-type (WT) and IL-10(-/-) mice. We report higher IL-12p40 mRNA accumulation and protein secretion in LPS-stimulated BMDCs isolated from IL-10(-/-) compared with WT mice. LPS-induced NF-kappaB signaling is similar in IL-10(-/-) and WT BMDCs as measured by IkappaBalpha phosphorylation and degradation, RelA phosphorylation and nuclear translocation, and NF-kappaB transcriptional activity, with no down-regulatory effects of exogenous IL-10. Chromatin immunoprecipitation demonstrated enhanced NF-kappaB (cRel, RelA) binding to the IL-12p40 promoter in IL-10(-/-) but not WT BMDCs. Interestingly, LPS induced STAT3 phosphorylation in WT but not IL-10(-/-) BMDCs, a process blocked by IL-10 receptor blocking antibody. Adenoviral gene delivery of a...Continue Reading

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