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Platelets and bronchospasm.

C P Page, W Paul, J Morley

    International Archives of Allergy and Applied Immunology
    |January 1, 1984
    PubMed
    Summary
    This summary is machine-generated.

    Platelet-activating factor (PAF-acether) and antigen trigger platelet buildup in the chest, increasing airway resistance in guinea pigs. This suggests physical obstruction isn't the only cause of bronchoconstriction.

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    Area of Science:

    • Pulmonary physiology
    • Immunology
    • Hematology

    Background:

    • Platelet activation plays a role in respiratory responses.
    • Understanding the mechanisms of bronchoconstriction is crucial for respiratory disease management.

    Purpose of the Study:

    • To investigate the relationship between intrathoracic platelet accumulation and changes in airway resistance.
    • To explore the role of Platelet-Activating Factor (PAF-acether) and antigen challenge in these responses.

    Main Methods:

    • Continuous recording of radiolabelled platelet accumulation and airway resistance in anesthetized guinea pigs.
    • Administration of PAF-acether and antigen (in sensitized animals) in dose-related studies.

    Main Results:

    Related Experiment Videos

  • Both PAF-acether and antigen caused dose-related intrathoracic platelet accumulation and increased airway resistance.
  • Maximal airway resistance increases occurred before maximal platelet accumulation.
  • Low antigen doses induced significant platelet accumulation without detectable changes in lung function.

    • Conclusions:

    • Intrathoracic platelet accumulation is linked to bronchoconstriction.
    • Physical obstruction of pulmonary vasculature is not the sole factor in platelet-dependent bronchoconstriction.
    • PAF-acether and antigen are potent mediators of platelet-related respiratory changes.