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Abstract
The influence of muscarinic receptor stimulation (carbachol) and blockade (scopolamine) on the release of 3H~labelled noradrenaline from adrenergic neurons was investigated in isolated detrusor preparations from rabbit, cat and man. A significant influence on the release of 3H from adrenergic nerve terminals was found in the three species with a concentration-dependent decrease and increase induced by carbachol and scopolamine, respectively. Using the α2-adrenoceptor stimulating and blocking agents clonidine and rauwolscine in rabbit and human detrusor preparations, the presence of prejunctionally located inhibitory α2-adrenoceptors could also be demonstrated. The findings indicate the possibility of a functionally important interaction between cholinergic and adrenergic nerves in the urinary bladder mediated via inhibitory muscarinic receptors on adrenergic nerve terminals.
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