The antioxidant tempol inhibits cardiac hypertrophy in the insulin-resistant GLUT4-deficient mouse in vivo

Rebecca H Ritchie, J M Quinn, Anh H Cao, Grant Raymond Drummond, David M Kaye, J M Favaloro, Joseph Proietto, Leanne MD Delbridge

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Reactive oxygen species such as superoxide are implicated in cardiac hypertrophy, but their contribution to the cardiac complications of insulin resistance is unresolved. We tested the hypothesis that the antioxidant tempol attenuates cardiac hypertrophy in insulin-resistant mice. Mice with cardiac GLUT4 deletion (GLUT4-knockout), superimposed on global GLUT4 suppression (GLUT4-knockdown) were administered tempol for 4 weeks. Age-matched GLUT4-knockdown littermates were used as controls (14 mice/group). GLUT4-knockout mice exhibited marked cardiac hypertrophy: heart to body weight ratio was increased 61+/-7 and expression of the hypertrophic genes beta-myosin heavy chain and B-type natriuretic peptide (BNP) were elevated 5.5+/-0.7- and 6.2+/-1.5-fold relative to control, respectively. Pro-fibrotic pro-collagen III expression was also higher (3.8+/-0.7-fold) in the GLUT4-knockout myocardium (all p
Original languageEnglish
Pages (from-to)1119 - 1128
Number of pages10
JournalJournal of Molecular and Cellular Cardiology
Issue number6
Publication statusPublished - 2007

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