title: Possible involvement of prostaglandins in the action of ATP on guinea-pig uterus.
abstract: ATP and other adenine derivatives, such as AMP and adenosine, at concentrations above 10(-6) M induced dose-dependent contractions of guinea-pig uterine strips. Treatment of the strips with nonsteroidal anti-inflammatory drugs, such as indomethacin, aspirin and phenylbutazone, at concentrations of 10(-6) to 10(-4) M irreversibly inhibited the contractions, without affecting those caused by acetylcholine and bradykinin. Arachidonic acid (10(-8)-10(-6) g/ml) and prostaglandins (E1, E2 and F2 alpha, 10(-9)-10(-7) g/ml) restored the inhibited uterine response to ATP, but the inhibition was reinstated on washing out of the arachidonic acid or prostaglandins. Furthermore, the prostaglandin antagonists polyphloretin phosphate (3 x 10(-5)-3 x 10(-4) g/ml) and SC 19220 (10(-6)-3 X 10(-5) M) selectively suppressed the action of ATP. In addition to the prostaglandin antagonists, 2,2'-pyridylisatogen, reported to be an ATP antagonist, at concentrations of 10(-6) to 3 x 10(-5) M selectively inhibited the response of uterine strips to ATP. These results suggest the involvement of prostaglandins in the actions of ATP and other adenine derivatives on guinea-pig uterine tissue and provide further evidence for ATP-stimulated prostaglandin formation in smooth muscle.
mesh_terms: D000227:Adenine Nucleotides / Q000494:pharmacology; D000255:Adenosine Triphosphate / Q000037:antagonists & inhibitors / Q000494:pharmacology*; D000818:Animals; D000893:Anti-Inflammatory Agents / Q000494:pharmacology; D001095:Arachidonic Acids / Q000494:pharmacology; D005260:Female; D006168:Guinea Pigs; D007082:Ileum / Q000187:drug effects; D066298:In Vitro Techniques; D007213:Indomethacin / Q000494:pharmacology; D007291:Inosine Monophosphate / Q000494:pharmacology; D009119:Muscle Contraction / Q000187:drug effects; D009130:Muscle, Smooth / Q000187:drug effects; D011448:Prostaglandin Antagonists; D011453:Prostaglandins / Q000502:physiology*; D011684:Purine Nucleosides / Q000494:pharmacology; D014590:Uterine Contraction / Q000187:drug effects*
chemical_list: D000227:Adenine Nucleotides; D000893:Anti-Inflammatory Agents; D001095:Arachidonic Acids; D011448:Prostaglandin Antagonists; D011453:Prostaglandins; D011684:Purine Nucleosides; D007291:Inosine Monophosphate; D000255:Adenosine Triphosphate; D007213:Indomethacin