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The effect of platelet activating factor on pulmonary β‐adrenoceptors
Author(s) -
Barnes P.J.,
Grandordy B.M.,
Page C.P.,
Rhoden K.J.,
Robertson D.N.
Publication year - 1987
Publication title -
british journal of pharmacology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.432
H-Index - 211
eISSN - 1476-5381
pISSN - 0007-1188
DOI - 10.1111/j.1476-5381.1987.tb11224.x
Subject(s) - isoprenaline , histamine , platelet activating factor , endocrinology , bronchodilatation , medicine , bronchodilator , guinea pig , in vitro , platelet , chemistry , pharmacology , asthma , stimulation , biochemistry
1 An intravenous infusion of platelet activating factor (Paf) in the guinea‐pig elicits an increase in bronchial responsiveness to the spasmogens, histamine and bombesin. 2 Airways obstruction induced by bombesin in Paf‐treated animals is poorly reversed by isoprenaline compared to comparable airways obstruction induced by bombesin in vehicle‐treated animals. 3 Isoprenaline induced a comparable dose‐related relaxation in vitro of tracheal smooth muscle isolated from Paf‐ and vehicle‐treated animals. 4 No change in β‐adrenoceptor numbers or binding affinity was observed in lungs removed from Paf‐treated animals in comparison with those from vehicle‐treated animals, or after direct incubation with Paf in vitro.5 The reduced bronchodilator responsiveness to isoprenaline in Paf‐treated animals is not related to changes in pulmonary β‐adrenoceptor function. These results suggest that non‐spasmogenic elements may contribute to airways obstruction induced in hyper‐responsive animals.
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