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2017 ; 31
(5
): 2065-2075
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Critical role of the cAMP-PKA pathway in hyperglycemia-induced epigenetic
activation of fibrogenic program in the kidney
#MMPMID28148567
Deb DK
; Bao R
; Li YC
FASEB J
2017[May]; 31
(5
): 2065-2075
PMID28148567
show ga
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-?B 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.