[Physiopathology of asthma]

Area of Science:

• Pulmonology
• Immunology
• Pathophysiology

Context:

• Bronchial asthma is increasingly recognized as a complex syndrome rather than a singular disease.
• Recent proposals suggest defining it as desquamative eosinophilic chronic bronchitis.
• Airway obstruction in asthma results from both bronchospasm and inflammation.

Purpose:

• To explore the multifaceted pathophysiology of bronchial asthma.
• To highlight the roles of resident airway cells, mediators, and inflammatory cell recruitment.
• To emphasize the need for studying repair mechanisms to enhance asthma treatment.

Summary:

• Asthma pathophysiology involves resident airway cells (mast cells, epithelial cells, alveolar macrophages) releasing mediators upon activation.
• These mediators, in conjunction with the nervous system, recruit inflammatory cells, primarily eosinophils, exacerbating the condition.
• Epithelial desquamation and collagen deposition post-asthma attack require significant time for resolution, underscoring the need for research into repair processes.

Impact:

• Improved understanding of asthma as a syndrome with diverse triggers (allergens, environment, infections, hormones).
• Highlights the "vicious circle" mechanism amplifying asthma events.
• Emphasizes the critical need for research into airway repair mechanisms for better therapeutic strategies.