Hexokinases and cardioprotection

J Mol Cell Cardiol. 2015 Jan;78:107-15. doi: 10.1016/j.yjmcc.2014.09.020. Epub 2014 Sep 26.

Abstract

As mediators of the first enzymatic step in glucose metabolism, hexokinases (HKs) orchestrate a variety of catabolic and anabolic uses of glucose, regulate antioxidant power by generating NADPH for glutathione reduction, and modulate cell death processes by directly interacting with the voltage-dependent anion channel (VDAC), a regulatory component of the mitochondrial permeability transition pore (mPTP). Here we summarize the current state-of-knowledge about HKs and their role in protecting the heart from ischemia/reperfusion (I/R) injury, reviewing: 1) the properties of different HK isoforms and how their function is regulated by their subcellular localization; 2) how HKs modulate glucose metabolism and energy production during I/R; 3) the molecular mechanisms by which HKs influence mPTP opening and cellular injury during I/R; and 4) how different metabolic and HK profiles correlate with susceptibility to I/R injury and cardioprotective efficacy in cancer cells, neonatal hearts, and normal, hypertrophied and failing adult hearts, and how these difference may guide novel therapeutic strategies to limit I/R injury in the heart. This article is part of a Special Issue entitled "Mitochondria: From Basic Mitochondrial Biology to Cardiovascular Disease".

Keywords: Cardioprotection; Hexokinase; Ischemia/reperfusion; Postconditioning; Preconditioning.

Publication types

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

MeSH terms

  • Animals
  • Glucose / metabolism
  • Heart Diseases / metabolism
  • Hexokinase / metabolism*
  • Humans
  • Isoenzymes
  • Metabolome
  • Mitochondria, Heart / metabolism
  • Mitochondrial Membrane Transport Proteins / metabolism
  • Myocardial Reperfusion Injury / metabolism
  • Myocardium / metabolism*
  • Neoplasms / metabolism

Substances

  • Isoenzymes
  • Mitochondrial Membrane Transport Proteins
  • mitochondrial permeability transition pore
  • Hexokinase
  • Glucose