[Mast cells and basophils in asthma]

Area of Science:

• Immunology
• Pulmonology

Context:

• Chronic asthma is characterized by nonspecific bronchial hyperreactivity.
• Inflammatory responses, including early and late phases, are triggered by various stimuli.
• The late phase of allergic reactions is linked to increased bronchial hyperreactivity.

Purpose:

• To explore the role of inflammatory cells, particularly basophils, in the pathophysiology of chronic asthma.
• To investigate the mechanisms underlying late-phase allergic reactions and their contribution to asthma.
• To examine the potential involvement of epithelial cells in chronic asthma.

Summary:

• Airway inflammation is implicated in bronchial hyperreactivity, a hallmark of chronic asthma.
• While mast cells are involved in early reactions, basophils are increasingly recognized for their role in the late phase.
• Histamine and leukotriene C4 (LTC4) are present in the late phase, and basophils release these mediators, unlike PGD2.
• Recent hypotheses suggest basophils from allergic and asthmatic patients exhibit higher releasability and interact with specific IgE.

Impact:

• Understanding the role of basophils and other cells like epithelial cells may reveal new therapeutic targets for chronic asthma.
• This research contributes to a more comprehensive understanding of asthma pathophysiology.
• Highlights the complexity of intercellular communication in allergic airway inflammation.