The effect of chronic alcohol administration on fatty acid metabolism and pyruvate oxidation of heart mitochondria

Eric Williams, Ting Kai Li

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

It has been proposed that the mechanism for myocardial triglyceride (TG) accumulation and diminished fatty acid oxidation in chronic alcoholic animals is mitochondrial damage and, possibly, altered palmitylcarnitine trasnferase (PCAT) activity. We have studied the fatty acid metabolism and PCAT activity of isolated heart mitochondria from 80 male rats pair-fed 52±7 days a liquid diet (35% fat) containing all essential nutrients but with ethanol or dextrin-maltose (control) as 36% of the total calories. Myocardial TG increased two to four times in alcohol-fed animals, but tissue free, acetyl- and acylcarnitine levels were unchanged. PCAT specific activity was not diminished in the alcoholic group (10.76±0.90 vs 13.38±1.60 nmol/min/mg) and Vmax and Km for carnitine were identical. Mitochondrial respiration rates with glutamate and palmityl- and acetylcarnitine were unchanged. However, pyruvate oxidation (states III and IV) in alcoholic animals was consistently reduced (200±23 and 28.3±4.0 vs 161±19 and 23.0±4.0 natoms oxygen/min/mg, respectively; P<0.001 and <0.02). These findings show that fat accumulation occurs despite the normal ability of the myocardium to transport and oxidize fatty acid. Furthermore, pyruvate dehydrogenase inhibition may be an early marker of alcohol induced myocardial damage.

Original languageEnglish
Pages (from-to)1003-1011
Number of pages9
JournalJournal of Molecular and Cellular Cardiology
Volume9
Issue number12
DOIs
StatePublished - 1977

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Palmitoylcarnitine
Heart Mitochondria
Pyruvic Acid
Fatty Acids
Alcohols
Triglycerides
Fats
Acetylcarnitine
Carnitine
Respiratory Rate
Glutamic Acid
Myocardium
Oxidoreductases
Ethanol
Oxygen
Diet
Food

Keywords

  • Alcoholic cardiomyopathy
  • Carnitine
  • Fatty acid metabolism
  • Mitochondria
  • Palmityl carnitine transferase
  • Pyruvate

ASJC Scopus subject areas

  • Molecular Biology
  • Cardiology and Cardiovascular Medicine

Cite this

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title = "The effect of chronic alcohol administration on fatty acid metabolism and pyruvate oxidation of heart mitochondria",
abstract = "It has been proposed that the mechanism for myocardial triglyceride (TG) accumulation and diminished fatty acid oxidation in chronic alcoholic animals is mitochondrial damage and, possibly, altered palmitylcarnitine trasnferase (PCAT) activity. We have studied the fatty acid metabolism and PCAT activity of isolated heart mitochondria from 80 male rats pair-fed 52±7 days a liquid diet (35{\%} fat) containing all essential nutrients but with ethanol or dextrin-maltose (control) as 36{\%} of the total calories. Myocardial TG increased two to four times in alcohol-fed animals, but tissue free, acetyl- and acylcarnitine levels were unchanged. PCAT specific activity was not diminished in the alcoholic group (10.76±0.90 vs 13.38±1.60 nmol/min/mg) and Vmax and Km for carnitine were identical. Mitochondrial respiration rates with glutamate and palmityl- and acetylcarnitine were unchanged. However, pyruvate oxidation (states III and IV) in alcoholic animals was consistently reduced (200±23 and 28.3±4.0 vs 161±19 and 23.0±4.0 natoms oxygen/min/mg, respectively; P<0.001 and <0.02). These findings show that fat accumulation occurs despite the normal ability of the myocardium to transport and oxidize fatty acid. Furthermore, pyruvate dehydrogenase inhibition may be an early marker of alcohol induced myocardial damage.",
keywords = "Alcoholic cardiomyopathy, Carnitine, Fatty acid metabolism, Mitochondria, Palmityl carnitine transferase, Pyruvate",
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T1 - The effect of chronic alcohol administration on fatty acid metabolism and pyruvate oxidation of heart mitochondria

AU - Williams, Eric

AU - Li, Ting Kai

PY - 1977

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N2 - It has been proposed that the mechanism for myocardial triglyceride (TG) accumulation and diminished fatty acid oxidation in chronic alcoholic animals is mitochondrial damage and, possibly, altered palmitylcarnitine trasnferase (PCAT) activity. We have studied the fatty acid metabolism and PCAT activity of isolated heart mitochondria from 80 male rats pair-fed 52±7 days a liquid diet (35% fat) containing all essential nutrients but with ethanol or dextrin-maltose (control) as 36% of the total calories. Myocardial TG increased two to four times in alcohol-fed animals, but tissue free, acetyl- and acylcarnitine levels were unchanged. PCAT specific activity was not diminished in the alcoholic group (10.76±0.90 vs 13.38±1.60 nmol/min/mg) and Vmax and Km for carnitine were identical. Mitochondrial respiration rates with glutamate and palmityl- and acetylcarnitine were unchanged. However, pyruvate oxidation (states III and IV) in alcoholic animals was consistently reduced (200±23 and 28.3±4.0 vs 161±19 and 23.0±4.0 natoms oxygen/min/mg, respectively; P<0.001 and <0.02). These findings show that fat accumulation occurs despite the normal ability of the myocardium to transport and oxidize fatty acid. Furthermore, pyruvate dehydrogenase inhibition may be an early marker of alcohol induced myocardial damage.

AB - It has been proposed that the mechanism for myocardial triglyceride (TG) accumulation and diminished fatty acid oxidation in chronic alcoholic animals is mitochondrial damage and, possibly, altered palmitylcarnitine trasnferase (PCAT) activity. We have studied the fatty acid metabolism and PCAT activity of isolated heart mitochondria from 80 male rats pair-fed 52±7 days a liquid diet (35% fat) containing all essential nutrients but with ethanol or dextrin-maltose (control) as 36% of the total calories. Myocardial TG increased two to four times in alcohol-fed animals, but tissue free, acetyl- and acylcarnitine levels were unchanged. PCAT specific activity was not diminished in the alcoholic group (10.76±0.90 vs 13.38±1.60 nmol/min/mg) and Vmax and Km for carnitine were identical. Mitochondrial respiration rates with glutamate and palmityl- and acetylcarnitine were unchanged. However, pyruvate oxidation (states III and IV) in alcoholic animals was consistently reduced (200±23 and 28.3±4.0 vs 161±19 and 23.0±4.0 natoms oxygen/min/mg, respectively; P<0.001 and <0.02). These findings show that fat accumulation occurs despite the normal ability of the myocardium to transport and oxidize fatty acid. Furthermore, pyruvate dehydrogenase inhibition may be an early marker of alcohol induced myocardial damage.

KW - Alcoholic cardiomyopathy

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KW - Palmityl carnitine transferase

KW - Pyruvate

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