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The pathophysiology of asthma

J C Hogg, P D Paré, R C Boucher

Canadian Medical Association Journal

|August 18, 1979

Summary

This summary is machine-generated.

In asthma, initial allergic reactions involve superficial mast cells releasing mediators. This alters airway permeability, amplifying the response and causing hyperresponsiveness in asthma patients.

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Area of Science:

Immunology
Pulmonology
Pathophysiology

Background:

Human postmortem studies offer limited insight into early asthma pathophysiology.
Animal models are crucial for understanding asthma onset.
The Ascaris-allergic rhesus monkey model allows examination of early pathophysiologic changes.

Purpose of the Study:

To investigate the initial pathophysiologic events in asthma.
To correlate early changes with airway structure in an animal model.
To understand the mechanisms behind airway hyperresponsiveness.

Main Methods:

Utilizing the Ascaris-allergic rhesus monkey model.
Examining airway structure and cellular events following antigen challenge.
Correlating mediator release with physiological responses like hyperresponsiveness.

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Main Results:

Initial antigen-mast cell interactions may occur in the bronchial lumen or superficial epithelium.
Mediator release stimulates mucosal stretch receptors and increases mucosal permeability.
Antigen challenge leads to histamine hyperresponsiveness and increased histamine absorption, suggesting increased histamine penetration into the bronchial wall.

Conclusions:

The initial event in acute asthma involves superficial mast cell mediator release.
This mediator release amplifies the allergic response by increasing mucosal permeability.
Altered permeability may explain airway hyperreactivity to nonspecific stimuli in asthma.