title: Regulation of cardiomyocyte hypertrophy in diabetes at the transcriptional level.
abstract: Diabetic cardiomyopathy, structurally characterized by cardiomyocyte hypertrophy and increased extracellular matrix (ECM) protein deposition, eventually leads to heart failure. We investigated the role of transcriptional coactivator p300 and its interaction with myocyte enhancer factor 2 (MEF2) in diabetes-induced cardiomyocyte hypertrophy. Neonatal rat cardiomyocytes were exposed to variable levels of glucose. Cardiomyocytes were analyzed with respect to their size. mRNA expression of p300, MEF2A, MEF2C, atrial natriuretic polypeptide (ANP), brain natriuretic polypeptide (BNP), angiotensinogen (ANG), cAMP-responsive element binding protein-binding protein (CBP), and protein analysis of MEF2 were done with or without p300 blockade. We investigated the hearts of STZ-induced diabetic rats and compared them with age- and sex-matched controls after 1 and 4 mo of followup with or without treatment with p300 blocker curcumin. The results were that cardiomyocytes, exposed to 25 mM glucose for 48 h, showed cellular hypertrophy and augmented mRNA expression of ANP, BNP, and ANG, molecular markers of cardiac hypertrophy. Glucose caused a duration-dependent increase of mRNA and protein expression in MEF2A and MEF2C and transcriptional coactivator p300. Curcumin, a p300 blocker, and p300 siRNA prevented these abnormalities. Similarly, ANP, BNP, and ANG mRNA expression was significantly higher in the hearts of diabetic rats compared with the controls, in association with increased p300, MEF2A, and MEF2C expression. Treatment with p300 blocker curcumin prevented diabetes-induced upregulation of these transcripts. We concluded that data from these studies demonstrate a novel glucose-induced epigenetic mechanism regulating gene expression and cardiomyocyte hypertrophy in diabetes.
authors.affiliation: Department of Pathology, University of Western Ontario, London, ON, Canada.
authors.forename: Biao
authors.initials: B
authors.lastname: Feng
authors.forename: Shali
authors.initials: S
authors.lastname: Chen
authors.forename: Jane
authors.initials: J
authors.lastname: Chiu
authors.forename: Biju
authors.initials: B
authors.lastname: George
authors.forename: Subrata
authors.initials: S
authors.lastname: Chakrabarti
mesh_terms: D000808:Angiotensinogen / Q000235:genetics / Q000378:metabolism; D000818:Animals; D000831:Animals, Newborn; D009320:Atrial Natriuretic Factor / Q000235:genetics / Q000378:metabolism; D015153:Blotting, Western; D009202:Cardiomyopathies / Q000235:genetics / Q000378:metabolism / Q000473:pathology*; D003921:Diabetes Mellitus, Experimental / Q000235:genetics / Q000378:metabolism / Q000473:pathology*; D004305:Dose-Response Relationship, Drug; D005260:Female; D005786:Gene Expression Regulation; D005947:Glucose / Q000008:administration & dosage* / Q000378:metabolism; D064326:MEF2 Transcription Factors; D008297:Male; D032383:Myocytes, Cardiac / Q000473:pathology; D018006:Myogenic Regulatory Factors / Q000235:genetics / Q000378:metabolism*; D020097:Natriuretic Peptide, Brain / Q000235:genetics / Q000378:metabolism; D012333:RNA, Messenger / Q000096:biosynthesis / Q000235:genetics; D051381:Rats; D017207:Rats, Sprague-Dawley; D014158:Transcription, Genetic; D050880:p300-CBP Transcription Factors / Q000037:antagonists & inhibitors / Q000378:metabolism*
chemical_list: D064326:MEF2 Transcription Factors; D018006:Myogenic Regulatory Factors; D012333:RNA, Messenger; C472610:atrial natriuretic peptide, rat; C495963:natriuretic peptide precursor type B, rat; D000808:Angiotensinogen; D020097:Natriuretic Peptide, Brain; D009320:Atrial Natriuretic Factor; D050880:p300-CBP Transcription Factors; D005947:Glucose