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Effects of ionophores on liver CYP1A and 3A in male broilers

L L Zhang1, J R Zhang, Z G Yu

  • 1College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, China.

Journal of Veterinary Pharmacology and Therapeutics
|November 11, 2010
PubMed

Insights

Ionophore antibiotics like monensin, salinomycin, and maduramycin increased cytochrome P450 (CYP) 3A protein expression in broiler chicks. This suggests potential drug interactions due to altered drug metabolism.

Area of Science:

  • Pharmacology
  • Biochemistry
  • Animal Science

Background:

  • Cytochrome P450 (CYP) enzymes are crucial for drug metabolism in animals.
  • Ionophore antibiotics are commonly used in poultry production.
  • Understanding their impact on CYP enzymes is vital for animal health and food safety.

Purpose of the Study:

  • To investigate the effects of three ionophore antibiotics (monensin, salinomycin, maduramycin) on CYP enzyme activity, protein, and mRNA expression in broiler chicks.
  • To determine if these antibiotics influence the metabolism of specific probe drugs.

Main Methods:

  • Male Arbor Acres broiler chicks were fed diets containing monensin, salinomycin, or maduramycin for 14 days.
  • CYP1A and CYP3A enzyme activities were measured using HPLC assays with probe drugs.
  • Protein expression of CYP1A and CYP3A was analyzed via Western blot.
  • mRNA levels of CYP1A4, CYP1A5, and CYP3A37 were quantified using real-time PCR.

Main Results:

  • Ionophore antibiotics did not affect caffeine metabolism or CYP1A/CYP3A mRNA expression.
  • A significant increase in dapsone metabolism and CYP3A protein expression was observed.
  • No significant change in CYP3A37 mRNA levels was detected, indicating post-transcriptional regulation.

Conclusions:

  • Ionophore antibiotics may induce CYP3A protein expression and enzyme activity in broiler chicks.
  • This induction appears to be regulated post-transcriptionally.
  • Concurrent use of ionophores with other drugs requires careful consideration due to potential alterations in drug metabolism.

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