Angiotensinogen gene expression is dependent on signal transducer and activator of transcription 3-mediated p300/cAMP response element binding protein-binding protein coactivator recruitment and histone acetyltransferase activity

Molecular Endocrinology
Sutapa RayAllan R Brasier

Abstract

Angiotensin II, a potent vasoactive peptide produced by proteolysis of the angiotensinogen (AGT) prohormone, plays a critical role in cardiovascular homeostasis. Recently we showed that IL-6 induces human (h)AGT transcription by activating the signal transducers and activators of transcription (STATs). Here we investigated the role of the coactivator p300/cAMP response element binding protein-binding protein (CBP) in STAT3-mediated hAGT gene expression. Overexpression of adenovirus 12S E1A, which binds and inactivates p300/CBP, strongly inhibited basal and stimulated hAGT transcription, whereas a mutant E1A defective in binding p300/CBP did not. Conversely, ectopic expression of p300 and CBP potentiated inducible hAGT promoter activity. Coimmunoprecipitation assays revealed STAT3-p300 interaction upon IL-6 stimulation. The STAT3-p300 association requires the STAT3 C-terminal transactivation domain, as STAT3 deleted of transactivation functions as a dominant-negative inhibitor and does not associate with p300/CBP. The observation that IL-6 stimulation increases histone H4 acetylation of the endogenous hAGT promoter, and expression of p300 deficient in histone acetyltransferase activity down-regulates hAGT promoter activity both ...Continue Reading

Citations

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