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FASEB J. 2017 May;31(5):2065-2075. doi: 10.1096/fj.201601116R. Epub 2017 Feb 1.

Critical role of the cAMP-PKA pathway in hyperglycemia-induced epigenetic activation of fibrogenic program in the kidney.

Author information

1
Department of Medicine The University of Chicago, Chicago, Illinois, USA.
2
Center for Research Informatics, Division of Biological Sciences, The University of Chicago, Chicago, Illinois, USA.
3
Department of Medicine The University of Chicago, Chicago, Illinois, USA; cyan@medicine.bsd.uchicago.edu.

Abstract

Hyperglycemia is a major pathogenic factor that promotes diabetic nephropathy, but the underlying mechanism remains incompletely understood. Here, we show that high glucose induced cAMP response element-binding protein (CREB)-binding protein (CBP)-mediated H3K9/14 hyperacetylation in approximately 5000 gene promoters in glomerular mesangial cells, including those of Tgfb1, Tgfb3, and Ctgf, the major profibrotic factors that are known to drive diabetic renal fibrogenesis. In these promoters, H3K9/14 hyperacetylation was closely associated with NF-κB or CREB motifs. Chromatin immunoprecipitation assays confirmed that hyperglycemia promoted phospho-p65 or phospho-CREB and CBP bindings and RNA polymerase II recruitment to these promoters in mesangial cells as well as in glomeruli that were purified from type I and type II diabetic mice. Under hyperglycemia, cAMP production and PKA activity were markedly increased as a result of glucose transporter 1-mediated glucose influx that drives glucose metabolism and ATP production, which led to increased phosphorylation of p65 and CREB. Inhibition of adenylyl cyclase or PKA activity blocked p65 and CREB phosphorylation, CBP recruitment, and histone acetylation in these promoters. Collectively, these data demonstrate that the cAMP-PKA pathway plays a key role in epigenetic regulation of key profibrotic factors in diabetes.-Deb, D. K., Bao, R., Li, Y. C. Critical role of the cAMP-PKA pathway in hyperglycemia-induced epigenetic activation of fibrogenic program in the kidney.

KEYWORDS:

ChIP-Seq; diabetic complication; histone acetylation; protein kinase A; renal fibrosis

PMID:
28148567
PMCID:
PMC5388553
DOI:
10.1096/fj.201601116R
[Indexed for MEDLINE]
Free PMC Article

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