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Do β3-adrenoceptor agonists cause urinary bladder smooth muscle relaxation by inhibiting acetylcholine release?

The mechanisms leading to improvement of overactive bladder syndrome upon treatment with a β3-adrenoceptor agonist remain controversial. New research points to a role of inhibition of neuronal acetylcholine release. Whether this occurs by a direct effect on prejunctional β3-adrenoceptors or indirectly by formation of adenosine and activation of A1 adenosine receptors is being discussed.