Mechanical unloading promotes myocardial energy recovery in human heart failure.

Published

Journal Article

BACKGROUND: Impaired bioenergetics is a prominent feature of the failing heart, but the underlying metabolic perturbations are poorly understood. METHODS AND RESULTS: We compared metabolomic, gene transcript, and protein data from 6 paired samples of failing human left ventricular tissue obtained during left ventricular assist device insertion (heart failure samples) and at heart transplant (post-left ventricular assist device samples). Nonfailing left ventricular wall samples procured from explanted hearts of patients with right heart failure served as novel comparison samples. Metabolomic analyses uncovered a distinct pattern in heart failure tissue: 2.6-fold increased pyruvate concentrations coupled with reduced Krebs cycle intermediates and short-chain acylcarnitines, suggesting a global reduction in substrate oxidation. These findings were associated with decreased transcript levels for enzymes that catalyze fatty acid oxidation and pyruvate metabolism and for key transcriptional regulators of mitochondrial metabolism and biogenesis, peroxisome proliferator-activated receptor γ coactivator 1α (PGC1A, 1.3-fold) and estrogen-related receptor α (ERRA, 1.2-fold) and γ (ERRG, 2.2-fold). Thus, parallel decreases in key transcription factors and their target metabolic enzyme genes can explain the decreases in associated metabolic intermediates. Mechanical support with left ventricular assist device improved all of these metabolic and transcriptional defects. CONCLUSIONS: These observations underscore an important pathophysiologic role for severely defective metabolism in heart failure, while the reversibility of these defects by left ventricular assist device suggests metabolic resilience of the human heart.

Full Text

Duke Authors

Cited Authors

  • Gupte, AA; Hamilton, DJ; Cordero-Reyes, AM; Youker, KA; Yin, Z; Estep, JD; Stevens, RD; Wenner, B; Ilkayeva, O; Loebe, M; Peterson, LE; Lyon, CJ; Wong, STC; Newgard, CB; Torre-Amione, G; Taegtmeyer, H; Hsueh, WA

Published Date

  • June 2014

Published In

Volume / Issue

  • 7 / 3

Start / End Page

  • 266 - 276

PubMed ID

  • 24825877

Pubmed Central ID

  • 24825877

Electronic International Standard Serial Number (EISSN)

  • 1942-3268

Digital Object Identifier (DOI)

  • 10.1161/CIRCGENETICS.113.000404

Language

  • eng

Conference Location

  • United States