Curcumin attenuates cardiomyocyte hypertrophy induced by high glucose and insulin via the PPARγ/Akt/NO signaling pathway

Diabetes Research and Clinical Practice
Rongchun ChenQing-Song Jiang

Abstract

To investigate the potential effect of curcumin on cardiomyocyte hypertrophy and a possible mechanism involving the PPARγ/Akt/NO signaling pathway in diabetes. The cardiomyocyte hypertrophy induced by high glucose (25.5mmol/L) and insulin (0.1μmol/L) (HGI) and the antihypertrophic effect of curcumin were evaluated in primary culture by measuring the cell surface area, protein content and atrial natriuretic factor (ANF) mRNA expression. The mRNA and protein expressions were assayed by reverse transcription PCR and Western blotting, whereas the NO concentration and endothelial NO synthase (eNOS) activity were determined using nitrate reduction and ELISA methods, respectively. The cardiomyocyte hypertrophy induced by HGI was characterized by increasing ANF mRNA expression, total protein content, and cell surface area, with downregulated mRNA and protein expressions of both PPARγ and Akt, which paralleled the declining eNOS mRNA expression, eNOS content, and NO concentration. The effects of HGI were inhibited by curcumin (1, 3, 10μmol/L) in a concentration-dependent manner. GW9662 (10μmol/L), a selective PPARγ antagonist, could abolish the effects of curcumin. LY294002 (20μmol/L), an Akt blocker, and N(G)-nitro-l-arginine-methyl es...Continue Reading

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