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Research ArticleTOXICOLOGY

Ranitidine Treatment during a Modest Inflammatory Response Precipitates Idiosyncrasy-Like Liver Injury in Rats

James P. Luyendyk, Jane F. Maddox, Gregory N. Cosma, Patricia E. Ganey, Gary L. Cockerell and Robert A. Roth
Journal of Pharmacology and Experimental Therapeutics October 2003, 307 (1) 9-16; DOI: https://doi.org/10.1124/jpet.103.054288
James P. Luyendyk
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Jane F. Maddox
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Gregory N. Cosma
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Patricia E. Ganey
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Gary L. Cockerell
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Robert A. Roth
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Abstract

Drug idiosyncrasy is an adverse event of unknown etiology that occurs in a small fraction of people taking a drug. Some idiosyncratic drug reactions may occur from episodic decreases in the threshold for drug hepatotoxicity. Previous studies in rats have shown that modest underlying inflammation triggered by bacterial lipopolysaccharide (LPS) can decrease the threshold for xenobiotic hepatotoxicity. The histamine-2 (H2)-receptor antagonist ranitidine (RAN) causes idiosyncratic reactions in people, with liver as a usual target. We tested the hypothesis that RAN could be rendered hepatotoxic in animals undergoing a modest inflammatory response. Male rats were treated with a nonhepatotoxic dose of LPS (44 × 106 endotoxin units/kg i.v.) or its vehicle and then 2 h later with a nonhepatotoxic dose of RAN (30 mg/kg i.v.) or its vehicle. Liver injury was evident only in animals treated with both RAN and LPS as estimated by increases in serum alanine aminotransferase, aspartate aminotransferase, and γ-glutamyl transferase activities within 6 h after RAN administration. LPS/RAN cotreatment resulted in midzonal liver lesions characterized by acute necrosuppurative hepatitis. Famotidine (FAM) is an H2-antagonist for which the propensity for idiosyncratic reactions is far less than RAN. Rats given LPS and FAM at a dose pharmacologically equipotent to that of RAN did not develop liver injury. In vitro, RAN sensitized hepatocytes to killing by cytotoxic products from activated neutrophils, whereas FAM lacked this ability. The results indicate that a response resembling human RAN idiosyncrasy can be reproduced in animals by RAN exposure during modest inflammation.

Footnotes

  • This work was supported by grants from Pharmacia Corporation and National Institutes of Health (ES01439 and DK061315). J.L. was partially supported by training grant number 5 T32 ES07255 from the National Institute of Environmental Health Sciences.

  • DOI: 10.1124/jpet.103.054288.

  • ABBREVIATIONS: LPS, lipopolysaccharide; PMN, polymorphonuclear leukocyte; H2, histamine-2; RAN, ranitidine; FAM, famotidine; EU, endotoxin unit; ALT, alanine aminotransferase; AST, aspartate aminotransferase; GGT, γ-glutamyl transferase; PMN-CM, PMN-conditioned medium; Veh, vehicle.

  • ↵1 Current address: Bristol Myers Squibb Co., New Brunswick, NJ.

    • Received May 12, 2003.
    • Accepted June 16, 2003.
  • The American Society for Pharmacology and Experimental Therapeutics
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Journal of Pharmacology and Experimental Therapeutics: 307 (1)
Journal of Pharmacology and Experimental Therapeutics
Vol. 307, Issue 1
1 Oct 2003
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Research ArticleTOXICOLOGY

Ranitidine Treatment during a Modest Inflammatory Response Precipitates Idiosyncrasy-Like Liver Injury in Rats

James P. Luyendyk, Jane F. Maddox, Gregory N. Cosma, Patricia E. Ganey, Gary L. Cockerell and Robert A. Roth
Journal of Pharmacology and Experimental Therapeutics October 1, 2003, 307 (1) 9-16; DOI: https://doi.org/10.1124/jpet.103.054288

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Research ArticleTOXICOLOGY

Ranitidine Treatment during a Modest Inflammatory Response Precipitates Idiosyncrasy-Like Liver Injury in Rats

James P. Luyendyk, Jane F. Maddox, Gregory N. Cosma, Patricia E. Ganey, Gary L. Cockerell and Robert A. Roth
Journal of Pharmacology and Experimental Therapeutics October 1, 2003, 307 (1) 9-16; DOI: https://doi.org/10.1124/jpet.103.054288
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