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Related Experiment Videos

Factors affecting massive postmortem bronchoconstriction in guinea pig lungs.

Y L Lai, W J Lamm, J Hildebrandt

    Journal of Applied Physiology: Respiratory, Environmental and Exercise Physiology
    |September 1, 1984
    PubMed
    Summary

    Postmortem guinea pig lungs show bronchoconstriction influenced by calcium ions (Ca2+) and mediators like substance P. Substance P depletion reduced airway spasm, while its release worsened it, indicating its role in postmortem airway reactivity.

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    Area of Science:

    • Pulmonary physiology
    • Pharmacology

    Background:

    • Postmortem changes in lung function, specifically bronchoconstriction, are not fully understood.
    • Endogenous mediators are suspected to play a role in airway reactivity after death.

    Purpose of the Study:

    • To investigate the endogenous factors contributing to bronchoconstriction in postmortem guinea pig lungs.
    • To elucidate the roles of calcium ions (Ca2+), substance P, thromboxane A2, and leukotrienes in postmortem airway spasm.

    Main Methods:

    • 58 guinea pigs were subjected to exsanguination or pulmonary perfusion with Ca2+-containing or Ca2+-free solutions.
    • Animals were treated to deplete or release substance P, block thromboxane A2 synthesis, inhibit leukotriene synthesis, or antagonize leukotriene actions.
    • Lung vital capacity, measured via pressure-volume curves, served as the primary indicator of bronchoconstriction.

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    Main Results:

    • Ca2+-free perfusate initially enhanced airway spasm, which then subsided.
    • Substance P depletion significantly reduced postmortem bronchial constriction.
    • Substance P release markedly increased airway spasm throughout the observation period.
    • FPL 55712 treatment lessened bronchospasm in lungs perfused with Ca2+.

    Conclusions:

    • Calcium ions (Ca2+) and endogenous mediators, particularly substance P, are implicated in postmortem guinea pig lung airway spasm.
    • These findings suggest specific pathways that could be targeted to modulate postmortem airway reactivity.