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Polyenylphosphatidylcholine opposes the increase of cytochrome P-4502E1 by ethanol and corrects its iron-induced

M K Aleynik1, M A Leo, S I Aleynik

  • 1Alcohol Research and Treatment Center, Bronx Veterans Affairs Medical Center and Mount Sinai School of Medicine, New York 10468, USA.

Alcoholism, Clinical and Experimental Research
|February 24, 1999
PubMed
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Dietary iron overload impairs cytochrome P-450 2E1 (2E1) activity. Polyenylphosphatidylcholine (PPC) supplementation corrects iron-induced decreases in 2E1 and reduces oxidative stress in alcohol-fed rats.

Area of Science:

  • Hepatology
  • Biochemistry
  • Nutritional Science

Background:

  • Dietary iron overload is known to damage liver cell membranes and reduce microsomal cytochromes P-450.
  • The impact of iron on cytochrome P-450 2E1 (2E1) and the protective effects of polyenylphosphatidylcholine (PPC) against iron-induced liver injury remain unclear.
  • Polyenylphosphatidylcholine (PPC) is a mixture of polyunsaturated phosphatidylcholines that has shown protective effects against alcohol-induced liver injury.

Purpose of the Study:

  • To investigate the effect of dietary iron overload on cytochrome P-450 2E1 (2E1) in rats.
  • To determine if polyenylphosphatidylcholine (PPC) can mitigate iron-induced alterations in 2E1 activity.
  • To assess the role of linoleate in PPC's potential protective effects against iron and alcohol.

Main Methods:

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  • Rats were fed liquid diets containing ethanol or carbohydrates, with or without carbonyl iron, and supplemented with either PPC or safflower oil (linoleate source) for 8 weeks.
  • Cytochrome P-450 2E1 (2E1) levels were measured using Western blots.
  • Enzyme activities of 2E1, including the microsomal ethanol oxidizing system (MEOS) and p-nitrophenolhydroxylase (PNP), were assessed.

Main Results:

  • Ethanol administration significantly increased 2E1 content and its associated enzyme activities.
  • Iron addition markedly reduced the ethanol-induced increase in 2E1, an effect that was restored by PPC supplementation.
  • PPC supplementation also decreased oxidative stress markers (F2-isoprostanes) in alcohol-fed rats, unlike safflower oil.

Conclusions:

  • Dietary iron overload negatively impacts cytochrome P-450 2E1 (2E1) induction and activity.
  • Polyenylphosphatidylcholine (PPC) effectively counteracts iron-induced suppression of 2E1 and reduces alcohol-related oxidative stress.
  • PPC demonstrates hepatoprotective properties beyond its linoleate content, suggesting a broader mechanism of action.