ACE inhibition prevents myocardial infarction-induced skeletal muscle mitochondrial dysfunction

Joffrey Zoll, Laurent Monassier, Anne Garnier, Benoit N'Guessan, Bertrand Mettauer, Vladimir Veksler, François Piquard, Renée Ventura-Clapier, Bernard Geny

Research output: Contribution to journalArticlepeer-review

65 Citations (Scopus)

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-1α, NRF-2α, 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-1α (-54%), NRF-2α (-45%), and MCIP1 (-84%) gene expression were significantly downregulated. ACEi improved survival, left ventricular function, and blood pressure. Perindopril protected also totally the Gas mitochondrial function and preserved the mRNAs concentration of the mitochondrial transcriptional factors. Moreover, PGC-1α correlated with Gas oxidative capacity (r = 0.48), mitochondrial cytochrome-c oxidase (r = 0.65), citrate synthase (r = 0.45) activities, and MCIP1 expression (r = 0.44). Thus ACEi totally prevented MI-induced alterations of skeletal muscle mitochondrial function and protein expression, halting the development of this metabolic myopathy.

Original languageEnglish
Pages (from-to)385-391
Number of pages7
JournalJournal of Applied Physiology
Volume101
Issue number2
DOIs
Publication statusPublished - 2006
Externally publishedYes

Keywords

  • Angiotensin-converting enzyme inhibition
  • Mitochondria
  • Rehabilitation

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