Autophagy is impaired in cardiac ischemia-reperfusion injury

Xiucui Ma, Haiyan Liu, Sarah R. Foyil, Rebecca J. Godar, Carla J. Weinheimer, Abhinav Diwan

Research output: Contribution to journalShort surveypeer-review

69 Scopus citations

Abstract

Accumulating evidence attests to a prosurvival role for autophagy under stress, by facilitating removal of damaged proteins and organelles and recycling basic building blocks, which can be utilized for energy generation and targeted macromolecular synthesis to shore up cellular defenses. These observations are difficult to reconcile with the dichotomous prosurvival and death-inducing roles ascribed to macroautophagy in cardiac ischemia and reperfusion injury, respectively. A careful reexamination of 'flux' through the macroautophagy pathway reveals that autophagosome clearance is markedly impaired with reperfusion (reoxygenation) in cardiomyocytes following an ischemic (hypoxic) insult, resulting from reactive oxygen species (ROS)-mediated decline in LAMP2 and increase in BECN1 abundance. This results in impaired autophagy that is 'ineffective' in protecting against cell death with ischemia-reperfusion injury. Restoration of autophagosome clearance and by inference, 'adequate' autophagy, attenuates reoxygenation-induced cell death.

Original languageEnglish
Pages (from-to)1394-1396
Number of pages3
JournalAutophagy
Volume8
Issue number9
DOIs
StatePublished - Sep 2012

Keywords

  • Autophagic flux
  • BECN1
  • Cell death
  • Ischemia-reperfusion
  • LAMP2
  • Reactive oxygen species

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