The importance of autophagy in cardioprotection

High Blood Press Cardiovasc Prev. 2014 Mar;21(1):21-8. doi: 10.1007/s40292-013-0029-9. Epub 2013 Nov 14.

Abstract

Autophagy is an intracellular lysosomal-mediated catabolic process in which senescent or damaged proteins and organelles are sequestered by double membrane-limited vesicles called autophagosomes, and then degraded by lysosomes. While the role of autophagy in different pathological states is context-dependent, it has been shown that during cardiac ischemia, autophagy is upregulated as a cardioprotective adaptation. We recently demonstrated that Rheb, a small GTP-binding protein that directly activates the complex 1 of the mechanistic target of rapamycin, is a critical regulator of autophagy during cardiac ischemia. We found that cardiac Rheb/mTORC1 signaling is activated in a deregulated manner during ischemia in obesity and metabolic syndrome. This uncontrolled activation of the Rheb/mTORC1 pathway leads to autophagy inhibition and to a reduction of myocardial tolerance to ischemia. This data further supports the relevance of autophagy as a fundamental protective mechanism during myocardial ischemia and suggests that reactivation of autophagy, in particular through the inhibition of Rheb/mTORC1 signaling may represent a promising therapeutic option to treat subjects with an acute myocardial infarction, particularly those affected by metabolic derangements. This review will deal with the biological significance of autophagy in cardioprotection.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't
  • Review

MeSH terms

  • Autophagy / physiology*
  • Heart Failure / physiopathology
  • Heart Failure / prevention & control*
  • Humans
  • Lysosomes / physiology
  • Mechanistic Target of Rapamycin Complex 1
  • Monomeric GTP-Binding Proteins / physiology
  • Multiprotein Complexes / physiology
  • Myocardial Infarction / physiopathology
  • Myocardial Infarction / prevention & control*
  • Myocardial Ischemia / physiopathology
  • Myocardial Ischemia / prevention & control*
  • Neuropeptides / physiology
  • Ras Homolog Enriched in Brain Protein
  • Signal Transduction / physiology
  • TOR Serine-Threonine Kinases / physiology

Substances

  • Multiprotein Complexes
  • Neuropeptides
  • RHEB protein, human
  • Ras Homolog Enriched in Brain Protein
  • Mechanistic Target of Rapamycin Complex 1
  • TOR Serine-Threonine Kinases
  • Monomeric GTP-Binding Proteins