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Bradykinin and human airways.

H H Newball, H R Keiser, J J Pisano

    Respiration Physiology
    |July 1, 1975
    PubMed
    Summary

    Bradykinin (BK) affects human airways differently in normal and asthmatic individuals. In asthmatics, BK causes bronchodilation and improved airflow, unlike in normal subjects.

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    Area of Science:

    • Respiratory Physiology
    • Pharmacology

    Background:

    • Bradykinin (BK) is a peptide with known effects on the cardiovascular and respiratory systems.
    • Understanding BK's impact on human airways is crucial for respiratory disease management.

    Purpose of the Study:

    • To investigate the effects of bradykinin on human airway function in both normal and asthmatic subjects.
    • To differentiate the respiratory responses to BK between healthy individuals and those with asthma.

    Main Methods:

    • Intravenous injection of bradykinin (1 mug/kg) in human subjects.
    • Measurement of respiratory system resistance (Rrs), closing volume (CV), forced vital capacity (FVC), expiratory volume in the first second (FEV1), maximal midexpiratory flow (MMF), and peak flow (PF).

    Main Results:

    • In normal subjects, BK reduced FVC, suggesting alveolar duct constriction.
    • In asthmatic subjects, BK decreased Rrs and CV, and increased FEV1, MMF, and PF, indicating bronchodilation.
    • FVC remained unchanged in asthmatics, suggesting concurrent alveolar duct constriction despite bronchodilation.

    Conclusions:

    • Bradykinin elicits distinct airway responses in asthmatics compared to normal individuals.
    • The observed bronchodilation in asthmatics may be a secondary effect, possibly mediated by adrenaline release, due to their higher intrinsic bronchial tone.
    • These findings suggest complex interactions between BK, airway tone, and potential secondary mediators in asthma pathophysiology.

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