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Tachyphylaxis to beta‐adrenoceptor agonists in human bronchial smooth muscle: studies in vitro.
Author(s) -
Davis C,
Conolly ME
Publication year - 1980
Publication title -
british journal of clinical pharmacology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.216
H-Index - 146
eISSN - 1365-2125
pISSN - 0306-5251
DOI - 10.1111/j.1365-2125.1980.tb01782.x
Subject(s) - tachyphylaxis , isoprenaline , desensitization (medicine) , endocrinology , medicine , chemistry , agonist , receptor , homologous desensitization , stimulation
In studies on human isolated peripheral airway smooth muscle; 1 A concentration dependent beta‐adrenoceptor tachyphylaxis was observed to isoprenaline. 2 Cross desensitization to other beta‐adrenoceptor agonists was demonstrated. 3 The desensitization was reversible with time. Hydrocortisone appeared to accelerate the recovery from the desensitized state. Low concentration isoprenaline (10(‐9) mol l‐1) prevented recovery whereas cyclohexamide 1.8 × 10(‐4) mol l‐1 had no noticeable effect on recovery. Continued occupancy of the receptor appears to prevent recovery. The recovery from the desensitized state does not apparently require synthesis of new proteins. 4 Bronchial wall cyclic AMP response to isoprenaline was attenuated after isoprenaline induced desensitization whereas total phosphodiesterase activity of bronchial wall was not altered by desensitization. Thus by exclusion the adenylate cyclase receptor complex may be altered in human peripheral airway smooth muscle beta‐adrenoceptor tachyphylaxis.