PMID: 14110756Dec 1, 1963Paper


British Journal of Pharmacology and Chemotherapy
A T Birmingham, A B WILSON


The isolated vas deferens of the guinea-pig contracted when stimulated transmurally with parallel wire electrodes. These contractions persisted in concentrations of hexamethonium, pentolinium, nicotine and mecamylamine which at the same time abolished the responses to hypogastric nerve stimulation. Procaine and lignocaine in local anaesthetic concentrations abolished the responses to transmural stimulation but potentiated the contractions produced by added noradrenaline. Guanethidine and bretylium in concentrations specific for adrenergic neurone blockade abolished the contractions due to transmural stimulation without impairing the responses of the muscle to added noradrenaline or acetylcholine. In contrast, high concentrations of the adrenergic-blocking agents phentolamine and dihydroergotamine were needed to block the contractions due to transmural stimulation; these concentrations also blocked the response to added noradrenaline but simultaneously reduced the responses to added acetylcholine or potassium chloride. Preparations from guinea-pigs previously treated with reserpine at first responded normally to transmural stimulation; thereafter the contractions diminished progressively but were never abolished. Hyoscine and at...Continue Reading


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