ACE inhibition prevents myocardial infarction-induced skeletal muscle mitochondrial dysfunction

Journal of Applied Physiology
J ZollB Geny

Abstract

Heart failure is associated with alterations in cardiac and skeletal muscle energy metabolism resulting in a generalized myopathy. We investigated the molecular and cellular effects of angiotensin-converting enzyme inhibition (ACEi) on skeletal muscle metabolism in infarcted animals. Myocardial infarction (MI) was obtained by left descending coronary artery ligation. Sham, MI, and MI-treated rats (perindopril, 2 mg.kg(-1).day(-1) given 7 days after MI) were studied 1 and 4 mo after surgery. Oxygen consumption of white gastrocnemius (Gas) muscle was studied in saponin-permeabilized fibers, using the main substrates of mitochondrial respiration. mRNA expression of nuclear factors (PGC-1alpha, NRF-2alpha, and mtTFA), involved in the transcription of mitochondrial proteins, and of MCIP1, a marker of calcineurin activation, were also determined. Echocardiographic left ventricular fractional shortening was reduced in both MI and perindopril group after 1 and 4 mo, whereas systemic blood pressure was reduced by 16% only in the MI group after 4 mo. The capacity of Gas to oxidize glutamate-malate, glycerol-triphosphate, or pyruvate (-30%, P < 0.01; -32%, P < 0.05; -33%, P < 0.01, respectively), was greatly decreased. Furthermore, PGC-1a...Continue Reading

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