Arylazido Aminopropionyl Atp (Anapp₃) Antagonism of Cat Urinary Bladder Contractions

ANAPP3 produces a transient contraction of the urinary bladder of the cat similar to that produced by ATP and hypogastric nerve stimulation. 2 ANAPP3 partially antagonizes the inhibition of pelvic nerve-evoked bladder contractions induced by adenosine, possibly by blocking P1 receptors. 3 ANAPP3 antagonizes contractions of the cat urinary bladder induced by ATP, beta, gamma-methylene ATP, pelvic nerve stimulation and hypogastric nerve stimulation. 4 ANAPP3 produces no antagonism of either noradrenaline-induced inhibition of pelvic nerve-evoked bladder contractions or acetylcholine-induced bladder contractions, thereby substantiating the specificity of the effect of ANAPP3 against purines.