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Related Experiment Videos

Allergic airway inflammation and beta-adrenoceptor dysfunction.

Vito Brusasco1, Emanuele Crimi, Michele Baroffio

  • 1Dipartimento di Medicina Interna, Università di Genova, Genoa, Italy. vito.brusasco@unige.it

Cell Biochemistry and Biophysics
|February 4, 2006
PubMed
Summary

Asthma patients show reduced beta-adrenoceptor agonist response due to Gs protein dysfunction. Leukotrienes contribute to this, but corticosteroids rapidly restore function, aiding acute asthma treatment.

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Area of Science:

  • Respiratory Medicine
  • Pharmacology
  • Cellular Biology

Background:

  • Asthma is characterized by reduced responsiveness to beta-adrenoceptor agonists.
  • Potential mechanisms include receptor/second messenger desensitization or dysfunction.
  • Our previous work indicated Gs protein dysfunction in asthmatic airways.

Purpose of the Study:

  • Investigate the mechanisms of beta-adrenoceptor dysfunction in allergen-challenged human bronchi.
  • Determine the role of leukotrienes and the effect of corticosteroids on this dysfunction.

Main Methods:

  • Passive sensitization of human bronchi followed by allergen challenge.
  • Assessment of beta-adrenoceptor responsiveness and Gs protein activity.
  • Treatment with leukotriene-receptor antagonists, cell membrane stabilizers, antihistamines, indomethacin, and beclomethasone dipropionate.

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Main Results:

  • Allergen challenge induced beta-adrenoceptor dysfunction via reduced Gs protein activity.
  • Leukotriene-receptor antagonists and a cell membrane stabilizer prevented this dysfunction.
  • Short-term beclomethasone dipropionate incubation rapidly restored beta-adrenoceptor and Gs protein function, independent of gene transcription.

Conclusions:

  • Leukotrienes play a key role in allergen-induced beta-adrenoceptor dysfunction in asthma.
  • Rapid restoration of Gs protein pathway by corticosteroids suggests a non-genomic mechanism contributing to their acute therapeutic effect in asthma.