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Mechanism of potentiation of contractor responses to catecholamines by methylxanthines in aortic strips
Author(s) -
KALSNER S.
Publication year - 1971
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.1476-5381.1971.tb08069.x
Subject(s) - caffeine , theophylline , chemistry , long term potentiation , phenylephrine , reserpine , pharmacology , medicine , endocrinology , biochemistry , receptor , blood pressure
Summary1 Caffeine and theophylline increased the amplitude of contractor esponses of untreated and reserpine pretreated rabbit aortic strips to catecholamines (adrenaline, α‐methylnoradrenaline, noradrenaline). Responses to amines without both the 3‐ and 4‐OH groups in the benzene ring (methoxamine, phenylephrine, Synephrine) were not increased by theophylline and only those to Synephrine were slightly enhanced by caffeine. 2 Compounds which inhibit catechol‐O‐methyltransferase (pyrogallol, tropolone, U‐0521) potentiated responses to catecholamines and abolished the enhancing effect of theophylline and caffeine. Also, the potentiation produced by inhibitors of O‐methylation was significantly reduced in the presence of the methylxanthines. 3 Experiments done with the aid of the technique of oil immersion, to eliminate the diffusion of drug from the tissue into the bathing medium, showed that theophylline and caffeine decreased the rate of inactivation of adrenaline by O‐methylation. 4 These findings indicate that methylxanthines potentiate the contractor responses to catecholamines in aortic strips by inhibiting their extraneuronal inactivation.