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Theophylline inhibits integrin-dependent eosinophil superoxide production
Giorgio L Piacentini1, Diego G Peroni, Alessandro Bodini
1Department of Pediatrics, University of Verona, Verona, Italy.
Allergy and Asthma Proceedings
|April 9, 2005
Summary
Theophylline inhibits eosinophil activation by interfering with integrin signaling pathways. This finding suggests a potential role for theophylline in managing allergic inflammatory responses in asthma.
Area of Science:
- Immunology
- Pharmacology
Background:
- Eosinophils play a key role in allergic inflammation, particularly in asthma.
- Theophylline is a methylxanthine drug with proposed anti-inflammatory properties.
- Integrins are crucial for eosinophil adhesion and activation.
Purpose of the Study:
- To investigate the effect of theophylline on integrin-mediated eosinophil activation.
- To determine if theophylline inhibits eosinophil function triggered by beta1- and beta2-integrin ligation.
Main Methods:
- Eosinophils from healthy donors were stimulated using monoclonal antibodies targeting beta1- and beta2-integrins.
- Theophylline was added at various concentrations (2.4 X 10(-5) M to 2.4 X 10(-4) M).
- Oxygen radical (O2-) generation was measured as an indicator of eosinophil activation.
Main Results:
- Theophylline significantly inhibited O2- generation when eosinophils were activated via VLA-4, LFA-1, and the common beta2-chain.
- Theophylline demonstrated a dose-dependent inhibitory effect.
- No significant effect was observed when eosinophils were stimulated with phorbol-myristate-acetate.
Conclusions:
- Theophylline interferes with eosinophil activation pathways mediated by beta1- and beta2-integrin engagement.
- This mechanism may contribute to theophylline's ability to reduce eosinophil infiltration and activation at sites of allergic inflammation.
- Theophylline shows potential as a therapeutic agent for asthma by modulating eosinophil function.