Journal
PULMONARY PHARMACOLOGY & THERAPEUTICS
Volume 21, Issue 1, Pages 115-124Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.pupt.2007.06.003
Keywords
beta-blockers; Asthma; Mouse trachea; Forced oscillation technique; Bronchial relaxation; Airway hyperresponsiveness; Prostaglandin receptors; beta-Adrenoceptors; Inverse agonists
Categories
Funding
- Sandler Program for Asthma Research
- NATIONAL INSTITUTE OF ALLERGY AND INFECTIOUS DISEASES [R01AI079236] Funding Source: NIH RePORTER
Ask authors/readers for more resources
Background: We have previously reported that chronic treatment with certain 'beta-blockers' reduces airway hyperresponsiveness (AHR) to methacholine in a murine model of asthma. Methods: Airway resistance was measured using the forced oscillation technique in ovalbulmin-sensitized and ovalbumin-challenged mice treated with several beta-adrenoceptor (beta-AR) ligands. We used the selective beta(2)-AR ligand ICI 118,551 and the preferential beta(1)-AR ligand metoprolol to investigate the receptor SLlhtyj)C mediating the beneficial effect. Expression of beta-ARs was evaluated using immunofluorescence. We evaluated several signaling proteins by western blot using lung homogenates, and measured the relaxation of the isolated trachea produced by EP2 and IP receptor agonists. Results: Four findings were associated with the decreased AHR after chronic beta-blocker treatment: (1) the highly selective beta(2)-AR antagonist/inverse agonist, ICI 118,551 produced the bronchoprotective effect; (2) beta(2)-AR up-regulation resulted from chronic 'beta-blocker' treatment; (3) reduced expression of certain proteins involved in regulating bronchial tone, namely, G(i), phosphodiesterase 4D and phospholipase C-beta 1; and (4) in enhanced bronchodilatory response to prostanoid agonists for the IP and EP2 receptors. Conclusions: These data suggest that in the murine model of asthma, several compensatory changes associated with either increased bronchodilator signaling or decreased bronchoconstrictive signaling, result from the chronic administration of certain 'beta-blockers'. (C) 2007 Elsevier Ltd. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available