期刊
JOURNAL OF IMMUNOLOGY
卷 183, 期 2, 页码 1471-1479出版社
AMER ASSOC IMMUNOLOGISTS
DOI: 10.4049/jimmunol.0900312
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资金
- Plan Nacional de Salad y Farmacia [SAF2007-60446]
- Fundacion Ramon Areces, Junta de Castilla y Leon [CS105C05]
- Red Tematica de Investigacion Cardiovascular
- Ramon y Cajal Program (Ministerio de Ciencia a Innovacion of Spain and Fondo Social Europco)
Stimulation of human monocyte-derived dendritic cells with the yeast extract zymosan is characterized by a predominant production of IL-10 and a strong induction of cyclooxygenase-2, but the molecular mechanisms underlying this response are only partially understood. To address this issue, the activation of transcription factors that may bind to the il10 proximal promoter was studied. Binding activity to Sp1, Sp3, NF-Y, and cAMP response element (CRE) sites was detected in the nuclear extracts of dendritic cells; however these binding activities were not influenced by zymosan. No binding activity to Stat1, Stat3, and c/EBP sites was detected. Notably, zymosan activated kappa B-binding activity, but inhibition of NF-kappa B was associated with enhanced IL-10 production. In sharp contrast, treatments acting on CREB (CRE binding protein), including 8-Br-CAMP, PGE(2), and inhibitors of PKA, COX, and glycogen-synthase kinase-3 beta showed a direct correlation between CREB activation and IL-10 production. Zymosan induced binding of both P-CREB and CREB-binding protein (CBP) to the il10 promoter as judged from chromatin immunoprecipitation assays, whereas negative results were obtained with Ab reactive to Sp1, Sp3, c-Maf, and NF-Y. Zymosan also induced nuclear translocation of the CREB coactivator transducer of regulated CREB activity 2 (TORC2) and interaction of TORC2 with P-CREB coincidental with the association of CREB to the il10 promoter. Altogether, our data show that zymosan induces il10 transcription by a CRE-dependent mechanism that involves autocrine secretion of PGE(2) and a network of interactions of PKA, MAP/ERK, glycogen-synthase kinase-3 beta, and calcineurin, which regulate CREB transcriptional activity by binding the coactivators CBP and TORC2 and inhibiting CBP interaction with other transcription factors. The Journal of Immunology, 2009, 183: 1471-1479.
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