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Related Experiment Videos

Extrapolation from animals to man: predictions, pitfalls and perspectives.

H W Ruelius

    Xenobiotica; the Fate of Foreign Compounds in Biological Systems
    |March 1, 1987
    PubMed
    Summary

    Understanding interspecies differences in drug disposition is crucial for accurate animal-to-human extrapolation in drug development. Physiological and biochemical variations significantly impact drug exposure, risk, and efficacy assessments, necessitating careful species selection.

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    Area of Science:

    • Pharmacology
    • Toxicology
    • Drug Development

    Background:

    • Comparative drug disposition studies are vital for extrapolating animal data to human subjects.
    • Interspecies variability in drug metabolism and excretion can significantly impact risk and efficacy assessments.
    • Understanding these differences is key to selecting appropriate animal models for human drug studies.

    Purpose of the Study:

    • To evaluate the relevance of drug disposition characteristics in interspecies comparisons for risk and efficacy assessment.
    • To illustrate how physiological and biochemical differences between species affect drug exposure and metabolic pathways.
    • To highlight the limitations of extrapolating data when stereochemical preferences in drug disposition differ.

    Main Methods:

    • Retrospective evaluation of drug disposition characteristics for oxaprozin, ciramadol, acebutolol, and esmolol.

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  • Analysis of species-specific routes of excretion, enterohepatic circulation, presystemic elimination, and metabolic pathways.
  • Examination of pharmacologically active metabolites and stereochemical preferences in drug disposition.

    • Main Results:

    • Species differences in drug disposition (e.g., excretion, metabolism, active metabolites) impact exposure and efficacy predictions.
    • Stereochemical preferences in racemic drug disposition can lead to misleading pharmacokinetic parameters if not considered.
    • Physiological differences, such as blood esterase activity, can control the duration of pharmacologic effect.

    Conclusions:

    • Accurate interspecies extrapolation requires careful consideration of drug disposition similarities and differences.
    • Limitations in animal models arise from physiological, biochemical, and stereochemical variations.
    • Future improvements include computer-assisted predictions, use of human tissues, and physiologically similar animal models like miniature swine.