title: Effects of phosphorothioate analogues of ATP, ADP and AMP on guinea-pig taenia coli and urinary bladder.
abstract: Phosphorothioate analogues of ATP, ADP and AMP were tested on the guinea-pig taenia coli and urinary bladder. The Rp diastereoisomers of the phosphorothioate analogues, ATP-alpha-S and ADP-alpha-S were respectively 7 and 3 times more effective than the Sp diastereoisomers in causing relaxation of the taenia coli. No stereoselectivity was observed for the diastereoisomers of ATP-beta-S. In guinea-pig bladder, no stereoselectivity was observed for any of the phosphorothioate analogues. These results show that P2-purinoceptors mediating inhibitory responses in the guinea-pig taenia coli show marked stereoselectivity, while P2-purinoceptors mediating excitatory responses in the guinea-pig bladder show little stereoselectivity.
mesh_terms: D000244:Adenosine Diphosphate / Q000031:analogs & derivatives* / Q000494:pharmacology; D000249:Adenosine Monophosphate / Q000031:analogs & derivatives* / Q000494:pharmacology; D000255:Adenosine Triphosphate / Q000031:analogs & derivatives* / Q000494:pharmacology; D000818:Animals; D055598:Chemical Phenomena; D002621:Chemistry; D003106:Colon / Q000187:drug effects; D005260:Female; D006168:Guinea Pigs; D066298:In Vitro Techniques; D008297:Male; D009119:Muscle Contraction / Q000187:drug effects*; D009130:Muscle, Smooth / Q000187:drug effects*; D013237:Stereoisomerism; D001743:Urinary Bladder / Q000187:drug effects
chemical_list: D000249:Adenosine Monophosphate; D000244:Adenosine Diphosphate; D000255:Adenosine Triphosphate