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Cocaine hepatotoxicity: Influence of hepatic enzyme inducing and inhibiting agents on the site of necrosis

Authors

  • Dr. Lois Roth,

    Corresponding author
    1. Department of Comparative & Experimental Pathology, University of Florida, Gainesville, Florida 32610
    • Department of Comparative and Experimental Pathology, Box 100145 JHMHSC, College of Veterinary Medicine, University of Florida, Gainesville, FL 32610
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  • Raymond D. Harbison,

    1. Department of Physiological Sciences, J. Hillis Miller Health Science Center, University of Florida, Gainesville, Florida 32610
    2. Center for Environmental and Human Toxicology, University of Florida, Gainesville, Florida 32610
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  • Robert C. James,

    1. Center for Environmental and Human Toxicology, University of Florida, Gainesville, Florida 32610
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  • Thomas Tobin,

    1. Graduate Center for Toxicology, University of Kentucky, Lexington, Kentucky 40506
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  • Stephen M. Roberts

    1. Department of Physiological Sciences, J. Hillis Miller Health Science Center, University of Florida, Gainesville, Florida 32610
    2. Center for Environmental and Human Toxicology, University of Florida, Gainesville, Florida 32610
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Abstract

Cocaine-induced hepatotoxicity has been reported in human beings and is well documented in mice. One interesting feature of this toxicity that appears to be common to both species is an apparent shift in the intraacinar site of necrosis under circumstances known to alter cocaine metabolism. However, the evidence in human subjects is limited, and studies elucidating the mechanism of this phenomenon cannot be performed in human beings. Although future studies in mice may define the basis of this mechanism, the current evidence is a somewhat fragmented composite of studies using different mouse strains and enzyme-inducing agents. Therefore a comprehensive pathologic investigation was initiated for the purpose of identifying and establishing an animal model suitable for studying this phenomenon. In naive ICR mice a single 60 mg/kg dose of cocaine was found to produce midzonal (zone 2) coagulative necrosis. In mice whose oxidative metabolism had been increased with β-ionone or in which esterase metabolism had been inhibited by diazinon, the severity of the toxicity was increased but the intraacinar origin of the lesion did not change. However, when the oxidative microsomal metabolism of ICR mice was induced by phenobarbital or β-napthoflavone, the acinar zone affected was dramatically different. Phenobarbital induction produced zone 1 necrosis, whereas β-napthoflavone induction caused necrosis in zone 3. The site of necrosis corresponded with the distribution of cocaine, and its metabolites were identified with colloidal gold-conjugated antibody probes. The results of this study suggest that the agents shifting the location of cocaine-induced hepatic necrosis alter the intraacinar site of protein binding of cocaine and its metabolites. (HEPATOLOGY 1992;15:934–940).

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