Chronic ethanol consumption increases homocysteine accumulation in hepatocytes

Anthony J. Barak, Harriet C. Beckenhauer, Kusum Kharbanda, Dean J Tuma

Research output: Contribution to journalArticle

48 Citations (Scopus)

Abstract

Results of previous studies have shown that chronic ethanol administration impairs methionine synthetase activity and decreases S-adenosylmethionine levels in the liver, indicating interference with homocysteine remethylation. The purpose of the present study was to investigate the effects of chronic ethanol feeding on the accumulation of homocysteine (Hcy), a potentially toxic agent. The research was divided into two experiments. In Experiment A, hepatocytes were isolated from pair-fed control and ethanol-fed rats after 2 weeks of feeding, and the release of Hcy into the medium was determined. Hepatocytes obtained from ethanol-fed rats released twice as much Hcy into the medium as did those obtained from controls. When hepatocytes were challenged by a methionine load, a marked increase in Hcy generation was observed, and the increase was further enhanced in hepatocytes obtained from ethanol-fed rats. In Experiment B, hepatocytes were isolated from pair-fed control and ethanol-fed rats after 4 weeks of feeding (the feeding time required for significant formation of alcoholic fatty liver in rats). In this experiment, similar results were obtained with Hcy generation as in Experiment A. In Experiment B, supplementation of the incubation medium with betaine prevented the increase in generation of Hcy by methionine-treated control cells as well as the generation of Hcy by cells of ethanol-treated rats. These results indicate that betaine may have the potential as a therapeutic agent against toxic Hcy formation.

Original languageEnglish (US)
Pages (from-to)77-81
Number of pages5
JournalAlcohol
Volume25
Issue number2
DOIs
StatePublished - Dec 1 2001

Fingerprint

Homocysteine
Hepatocytes
Ethanol
Rats
experiment
Betaine
Poisons
Experiments
Methionine
Liver
Alcoholic Fatty Liver
alcoholism
5-Methyltetrahydrofolate-Homocysteine S-Methyltransferase
S-Adenosylmethionine
interference
Cells
Research

Keywords

  • Betaine
  • Ethanol
  • Hepatocytes
  • Homocysteine
  • Methionine-loading

ASJC Scopus subject areas

  • Health(social science)
  • Medicine(all)
  • Biochemistry
  • Toxicology
  • Neurology
  • Behavioral Neuroscience

Cite this

Chronic ethanol consumption increases homocysteine accumulation in hepatocytes. / Barak, Anthony J.; Beckenhauer, Harriet C.; Kharbanda, Kusum; Tuma, Dean J.

In: Alcohol, Vol. 25, No. 2, 01.12.2001, p. 77-81.

Research output: Contribution to journalArticle

Barak, Anthony J. ; Beckenhauer, Harriet C. ; Kharbanda, Kusum ; Tuma, Dean J. / Chronic ethanol consumption increases homocysteine accumulation in hepatocytes. In: Alcohol. 2001 ; Vol. 25, No. 2. pp. 77-81.
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