Effects of chronic alcohol consumption on regulation of myocardial protein synthesis

T. C. Vary, C. J. Lynch, C. H. Lang

Research output: Contribution to journalArticle

46 Citations (Scopus)

Abstract

Heart disease represents an important etiology of mortality in chronic alcoholics. The purpose of the present study was to examine potential mechanisms for the inhibitory effect of chronic alcohol exposure (16 wk) on the regulation of myocardial protein metabolism. Chronic alcohol feeding resulted in a lower heart weight and 25% loss of cardiac protein per heart compared with pair-fed controls. The loss of protein mass resulted in part from a diminished (30%) rate of protein synthesis. Ethanol exerted its inhibition of protein synthesis through diminished translational efficiency rather than lower RNA content. Chronic ethanol administration decreased the abundance of eukaryotic initiation factor (eIF)4G associated with eIF4E in the myocardium by 36% and increased the abundance of the translation response protein (4E-BP1) associated with eIF4E. In addition, chronic alcohol feeding significantly reduced the extent of p70S6 kinase (p70S6K) phosphorylation. The decreases in the phosphorylation of 4E-BP1 and p70S6K did not result from a reduced abundance of mammalian target of rapamycin (mTOR). These data suggest that a chronic alcohol-induced impairment in myocardial protein synthesis results in part from inhibition in peptide chain initiation secondary to marked changes in eIF4E availability and p70S6K phosphorylation.

Original languageEnglish (US)
JournalAmerican Journal of Physiology - Heart and Circulatory Physiology
Volume281
Issue number3 50-3
StatePublished - Oct 1 2001

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Alcohol Drinking
Alcohols
Proteins
Phosphotransferases
Phosphorylation
Eukaryotic Initiation Factor-4G
Ethanol
Protein Biosynthesis
Sirolimus
Alcoholics
Weight Loss
Heart Diseases
Myocardium
RNA
Efficiency
Peptides
Mortality
Inhibition (Psychology)

All Science Journal Classification (ASJC) codes

  • Physiology
  • Cardiology and Cardiovascular Medicine
  • Physiology (medical)

Cite this

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title = "Effects of chronic alcohol consumption on regulation of myocardial protein synthesis",
abstract = "Heart disease represents an important etiology of mortality in chronic alcoholics. The purpose of the present study was to examine potential mechanisms for the inhibitory effect of chronic alcohol exposure (16 wk) on the regulation of myocardial protein metabolism. Chronic alcohol feeding resulted in a lower heart weight and 25{\%} loss of cardiac protein per heart compared with pair-fed controls. The loss of protein mass resulted in part from a diminished (30{\%}) rate of protein synthesis. Ethanol exerted its inhibition of protein synthesis through diminished translational efficiency rather than lower RNA content. Chronic ethanol administration decreased the abundance of eukaryotic initiation factor (eIF)4G associated with eIF4E in the myocardium by 36{\%} and increased the abundance of the translation response protein (4E-BP1) associated with eIF4E. In addition, chronic alcohol feeding significantly reduced the extent of p70S6 kinase (p70S6K) phosphorylation. The decreases in the phosphorylation of 4E-BP1 and p70S6K did not result from a reduced abundance of mammalian target of rapamycin (mTOR). These data suggest that a chronic alcohol-induced impairment in myocardial protein synthesis results in part from inhibition in peptide chain initiation secondary to marked changes in eIF4E availability and p70S6K phosphorylation.",
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Effects of chronic alcohol consumption on regulation of myocardial protein synthesis. / Vary, T. C.; Lynch, C. J.; Lang, C. H.

In: American Journal of Physiology - Heart and Circulatory Physiology, Vol. 281, No. 3 50-3, 01.10.2001.

Research output: Contribution to journalArticle

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