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Effects ofPlasmodium berghei infection on cytochromes P-450 2E1 and 3A2

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Summary

Metabolism and disposition of most drugs used to treat malaria are substantially altered in malaria infection. Few data are available that specify effects of malaria infection on drug metabolism pathways in humans or animal model systems. In this report, studies were undertaken to determine the effect ofPlasmodium berghei infection on cytochrome P-450 (CYP450) 2E1 and 3A2-mediated metabolism and enzyme expression in rat liver microsomes. Malaria infection (MAL) resulted in significant decreases in total cytochrome P-450 content (56%,P<0.05) and NADPH cytochrome P-450 reductase activity (32%,P<0.05) as compared to control (CON) rats. Chlorzoxazone 4-hydroxylase activity (CYP2E1-mediated) showed no significant difference between CON and MAL microsomes while testosterone 6-\-hydroxylase activity (CYP3A2-mediated) was reduced by 41% (P<0.05) in MAL. Enzyme kinetic studies and immunoblot analysis indicate that the loss of activity for CYP3A2 in malaria infection is due to significantly decreased CYP3A2 protein expression. The altered expression of CYP450s in malaria infection should be taken into account when treating patients with malaria in order to minimize drug-drug interactions or toxicity.

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Author notes

  1. K. Uhl

    Present address: Uhl, US Food and Drug Administration, Office of Clinical Pharmacology/Biopharmaceutics, 9201 Corporate Blvd, HFD-880, 20850, Rockville, MD, USA

Authors and Affiliations

  1. Department of Pharmacology, Walter Reed Army Institute of Research, Washington, DC, USA

    K. Uhl, J. M. Grace, D. A. Kocisko, B. T. Jennings & A. L. Mitchell

  2. Armed Forces Research Institute of Medical Science, Bangkok, Thailand

    T. G. Brewer

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Uhl, K., Grace, J.M., Kocisko, D.A. et al. Effects ofPlasmodium berghei infection on cytochromes P-450 2E1 and 3A2. Eur. J. Drug Metab. Pharmacokinet. 24, 169–176 (1999). https://doi.org/10.1007/BF03190365

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  • DOI: https://doi.org/10.1007/BF03190365

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