title: Role of p300 and PCAF in regulating cyclooxygenase-2 promoter activation by inflammatory mediators.
abstract: Coactivators p300 and CREB (cyclic adenosine monophosphate [cAMP]-response element binding protein)-binding protein (CBP) serve as an integrator for gene transcription. Their relative involvement in regulating cyclooxygenase-2 (COX-2) promoter activity had not been characterized. Using fibroblast and macrophage COX-2 transcription as a model, we determined p300 and CBP levels in nuclear extracts and their binding to a COX-2 promoter probe. CBP level was barely detectable and there was little CBP binding. In contrast, p300 was detectable in nucleus and its binding to a COX-2 promoter probe was enhanced by phorbol 12-myristate 13-acetate (PMA), interleukin-1 beta(IL-1 beta), or lipopolysaccharide (LPS). Binding of p300/CBP-associated factor (PCAF) was also up-regulated. COX-2 proteins and promoter activities induced by these agonists were augmented by p300 overexpression. Early region 1A (E1A), but not its deletion mutant, abrogated COX-2 expression induced by inflammatory mediators and with or without p300 overexpression. Molecular analysis of p300 revealed the requirement of multiple domains, including histone acetyltransferase (HAT) for COX-2 transactivation. Furthermore, roscovitine, an indirect inhibitor of p300 HAT, and histone deacetylase-1 transfection completely abolished COX-2 promoter activity. We conclude that p300 is the predominant coactivator that is essential for COX-2 transcriptional activation by proinflammatory mediators.
authors: Vascular Biology Research Center, Institute of Molecular Medicine and Division of Hematology, University of Texas Health Science Center, Houston, TX 77030, USA.
authors: Wu-Guo
authors: WG
authors: Deng
authors: Ying
authors: Y
authors: Zhu
authors: Kenneth K
authors: KK
authors: Wu
mesh_terms: D017500:Adenovirus E1A Proteins / Q000235:genetics; D050882:CREB-Binding Protein; D002273:Carcinogens / Q000494:pharmacology; D002460:Cell Line; D017362:Cyclic AMP Response Element-Binding Protein / Q000378:metabolism; D051546:Cyclooxygenase 2; D004268:DNA-Binding Proteins / Q000235:genetics / Q000378:metabolism*; D004791:Enzyme Inhibitors / Q000494:pharmacology; D015870:Gene Expression / Q000187:drug effects / Q000276:immunology; D056284:Histone Deacetylase 1; D006655:Histone Deacetylases / Q000235:genetics / Q000378:metabolism; D006801:Humans; D018836:Inflammation Mediators / Q000494:pharmacology; D007375:Interleukin-1 / Q000494:pharmacology; D007527:Isoenzymes / Q000235:genetics*; D008070:Lipopolysaccharides / Q000494:pharmacology; D008565:Membrane Proteins; D016296:Mutagenesis; D009687:Nuclear Proteins / Q000235:genetics / Q000378:metabolism*; D011401:Promoter Regions, Genetic / Q000502:physiology; D011451:Prostaglandin-Endoperoxide Synthases / Q000235:genetics*; D011687:Purines / Q000494:pharmacology; D000077546:Roscovitine; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology; D015534:Trans-Activators / Q000235:genetics / Q000378:metabolism*; D014157:Transcription Factors / Q000235:genetics / Q000378:metabolism*; D014162:Transfection; D015854:Up-Regulation / Q000276:immunology
chemical_list: D017500:Adenovirus E1A Proteins; D002273:Carcinogens; D017362:Cyclic AMP Response Element-Binding Protein; D004268:DNA-Binding Proteins; D004791:Enzyme Inhibitors; D018836:Inflammation Mediators; D007375:Interleukin-1; D007527:Isoenzymes; D008070:Lipopolysaccharides; D008565:Membrane Proteins; D009687:Nuclear Proteins; D011687:Purines; D015534:Trans-Activators; D014157:Transcription Factors; D000077546:Roscovitine; D051546:Cyclooxygenase 2; C496540:PTGS2 protein, human; D011451:Prostaglandin-Endoperoxide Synthases; D050882:CREB-Binding Protein; C494363:CREBBP protein, human; C110550:HDAC1 protein, human; D056284:Histone Deacetylase 1; D006655:Histone Deacetylases; D013755:Tetradecanoylphorbol Acetate