Free radicals in alcoholic myopathy: indices of damage and preventive studies

Free Radic Biol Med. 2002 Apr 15;32(8):683-7. doi: 10.1016/s0891-5849(01)00794-8.

Abstract

Chronic alcoholic myopathy affects up to two-thirds of all alcohol misusers and is characterized by selective atrophy of Type II (glycolytic, fast-twitch, anaerobic) fibers. In contrast, the Type I fibers (oxidative, slow-twitch, aerobic) are relatively protected. Alcohol increases the concentration of cholesterol hydroperoxides and malondialdehyde-protein adducts, though protein-carbonyl concentration levels do not appear to be overtly increased and may actually decrease in some studies. In alcoholics, plasma concentrations of alpha-tocopherol may be reduced in myopathic patients. However, alpha-tocopherol supplementation has failed to prevent either the loss of skeletal muscle protein or the reductions in protein synthesis in alcohol-dosed animals. The evidence for increased oxidative stress in alcohol-exposed skeletal muscle is thus inconsistent. Further work into the role of ROS in alcoholic myopathy is clearly warranted.

Publication types

  • Research Support, Non-U.S. Gov't
  • Review

MeSH terms

  • Alcoholism / complications*
  • Alcoholism / metabolism
  • Animals
  • Cholesterol / analogs & derivatives*
  • Cholesterol / metabolism
  • Free Radicals / metabolism*
  • Humans
  • Malondialdehyde / metabolism
  • Muscular Diseases / etiology*
  • Muscular Diseases / metabolism
  • Muscular Diseases / prevention & control*
  • Rats
  • Reactive Oxygen Species / metabolism

Substances

  • Free Radicals
  • Reactive Oxygen Species
  • Malondialdehyde
  • cholesterol hydroperoxide
  • Cholesterol