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Gastrointestinal ulcerations induced by anti-inflammatory drugs in rats

Physicochemical and biochemical factors involved

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Abstract

Aspirin, diclofenac, diflunisal, ibuprofen and indomethacin were given orally or intravenously to fasted or fed rats. The resulting gastric and intestinal damage was assessed using standard methods. The same drugs were administered to rats with biliary fitulas, and the fraction of drug excreted in bile was quantified using HPLC methods. We found that gastric damage occurred only in the fasted animals and was found to be dose-dependent and related to the amount (r=0.871) and solubility (r=0.909) of the individual drug. As far as acute gastric toxicity is concerned, neither the potency of a drug as an inhibitor of cyclo-oxygenase nor the fraction of unchanged or conjugated agent excreted in bile appeared to be relevant. Secondly, ulcerations of the small intestine occurred in fed animals only. The degree of damage was related to the amount of unchanged or conjugated drug excreted in bile and cyclo-oxygenase inhibitory potency (r=0.873). The administered dose (within the range investigated) and drug solubility appeared not to contribute to intestinal toxicity. It is concluded that, in the rat, acute gastric and intestinal toxicity of non-steroidal anti-inflammatory drugs are due to different mechanisms. Whereas gastric toxicity is strongly influenced by the amount of drug dissolved under the pH conditions in the stomach, intestinal toxicity appears to depend on biliary excretion and enterohepatic circulation of a drug as well as on its potency as an inhibitor of prostaglandin synthesis.

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Authors and Affiliations

  1. Department of Pharmacology and Toxicology, University of Erlangen-Nürnberg, Universitätsstrasse 22, D-8520, Erlangen, Federal Republic of Germany

    W. S. Beck & K. Brune

  2. Department of Internal Medicine I, University of Erlangen-Nürnberg, Universitätsstrasse 22, D-8520, Erlangen, Federal Republic of Germany

    H. T. Schneider

  3. College of Pharmacy, Department of Pharmaceutics, University of Florida, JHMHC, Box J-494, 32610, Gainsville, Fl., USA

    K. Dietzel

  4. Department of Rheumatology, Royal North Shore Hospital, University of Sydney, 2065, St. Leonards, NSW, Australia

    B. Nuernberg

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  1. W. S. Beck
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  2. H. T. Schneider
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  3. K. Dietzel
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  4. B. Nuernberg
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  5. K. Brune
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Beck, W.S., Schneider, H.T., Dietzel, K. et al. Gastrointestinal ulcerations induced by anti-inflammatory drugs in rats. Arch Toxicol 64, 210–217 (1990). https://doi.org/10.1007/BF02010727

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  • DOI: https://doi.org/10.1007/BF02010727

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