Abstract
1 High concentrations of adenosine 5'-triphosphate (ATP, 100 to 1000 micrometer) were required to cause contraction of the rat urinary bladder, while adenosine and adenosine 5'monophosphate (AMP, 1 to 50 micrometer) produced relaxation. 2 One hundred fold lower concentrations of beta-gamma-methylene ATP, which is resistant to degradation to AMP and adenosine, caused dose-dependent, phasic contractions which mimicked atropine-resistant responses to nerve stimulation. 3 Adenosine and AMP caused dose-dependent inhibition of carbachol-induced contractions; theophylline competitively antagonized this inhibition but not the contractile responses to beta-gamma-methylene ATP, ATP or atropine-resistant nerve stimulation. 4 These results suggest that the insensitivity of the rat bladder to ATP is due to its rapid degradation to AMP and adenosine and support the hypothesis that the bladder receives a purinergic excitatory innervation.
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Selected References
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