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Related Experiment Videos

Ornithine alpha-ketoglutarate counteracts the decrease of liver cytochrome P-450 content in burned rats.

M Roch-Arveiller1, J Fontagné, C Coudray-Lucas

  • 1Département de Pharmacologie, Hôpital Cochin, Paris, France.

Nutrition (Burbank, Los Angeles County, Calif.)
|June 4, 1999
PubMed
Summary

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Ornithine alpha-ketoglutarate (OKG) supplementation maintained cytochrome P-450 levels in injured rats. OKG also counteracted diet-induced increases in EROD activity, suggesting improved drug metabolism in this population.

Area of Science:

  • Biochemistry
  • Pharmacology
  • Toxicology

Background:

  • Cytochrome P-450 enzymes are crucial for drug metabolism.
  • Injury and nutritional deficits can impair P-450 activity.
  • Ornithine alpha-ketoglutarate (OKG) is being investigated for its potential therapeutic benefits.

Purpose of the Study:

  • To investigate the effect of OKG on cytochrome P-450 enzyme activities in a rat model of burn injury, fasting, and hypocaloric diet.
  • To determine if OKG can mitigate the negative impact of injury and nutritional stress on drug metabolism.
  • To assess the impact of OKG on specific P-450 isotypes (1A, 2A, 3A).

Main Methods:

  • Young rats were subjected to a model of injury: burn followed by fasting and a hypocaloric diet for 3 days.

Related Experiment Videos

  • Hepatic microsomes were isolated and cytochrome P-450 levels were quantified spectrophotometrically.
  • Enzyme activities of ethoxy-resorufin-O-deethylase (EROD), benzyloxy-resorufin-O-dealkylase (BROD), and erythromycin demethylase were measured as markers for P-450 1A, 2A, and 3A, respectively.

    • Main Results:

    • A hypocaloric diet decreased cytochrome P-450 levels by 23%, and burn injury further reduced them by 15%.
    • OKG administration maintained cytochrome P-450 levels in both healthy and burned rats, similar to ad libitum fed rats.
    • OKG supplementation counteracted the 40% increase in EROD activity induced by the hypocaloric diet but did not affect BROD or erythromycin demethylase activities.

    Conclusions:

    • OKG effectively sustains hepatic cytochrome P-450 levels in rats subjected to burn injury and nutritional stress.
    • OKG may improve drug metabolism in injured populations by counteracting diet-induced alterations in specific P-450 activities.
    • These findings highlight the potential of OKG as a supportive therapy in critical illness to optimize drug efficacy.