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Methacholine: a 7-day inhalation toxicity study with primates.

R Binns, G C Clark, C J Hardy

    Toxicology
    |January 1, 1975
    PubMed
    Summary

    Methacholine inhalation acutely impacts breathing mechanics in monkeys, causing rapid but temporary changes. Sub-acute exposure for 7 days increased pulmonary resistance, indicating persistent lung effects.

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    Area of Science:

    • Toxicology
    • Respiratory Physiology

    Background:

    • Methacholine is a muscarinic receptor agonist.
    • Understanding its inhalation toxicity is crucial for occupational safety and pharmaceutical development.

    Purpose of the Study:

    • To evaluate the acute and sub-acute inhalation toxicity of methacholine in cynomolgus monkeys.
    • To assess the impact of methacholine aerosol exposure on respiratory function and overall health.

    Main Methods:

    • Cynomolgus monkeys were exposed to methacholine aerosol (2% solution).
    • Acute toxicity assessed via respiratory parameters (tidal volume, rate, compliance, resistance).
    • Sub-acute toxicity evaluated through daily exposure for 7 days, with subsequent hematology, blood biochemistry, urinalysis, blood gas analysis, ECG, and histopathology.

    Main Results:

    • Acute exposure caused rapid, transient changes in lung mechanics, including decreased tidal volume and increased pulmonary resistance.
    • Sub-acute exposure did not result in significant changes in hematology, blood biochemistry, urinalysis, blood gas analysis, or ECG.
    • Pulmonary resistance remained elevated post-exposure, persisting for up to 9 weeks, suggesting long-term effects on lung function.

    Conclusions:

    • Methacholine inhalation causes acute, reversible changes in respiratory mechanics.
    • Sub-acute methacholine exposure leads to persistent increases in pulmonary resistance in non-human primates.
    • Further investigation into the long-term respiratory consequences of methacholine exposure is warranted.

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