title: Response of urethral smooth muscles to pharmacological agents. II. Noncholinergic, nonadrenergic agonists and antagonists.
abstract: We studied the effects of a variety of noncholinergic, nonadrenergic agents on the smooth muscles of the cat urethra. Prostaglandin F2 alpha contracted both urethral muscle layers to a similar extent. Prostaglandin E2 contracted the longitudinal and relaxed the circular muscle layers. The effects of the prostaglandins seem to be directly myogenic since cholinergic and adrenergic blockers and tetrodotoxin did not affect them. Bradykinin and substance P contracted both urethral muscle layers. Other tested agonists (neurotensin, vasoactive intestinal peptide, cyclic 3,5 adenosine monophosphate, adenosine diphosphate sodium, cyclic 3,5 guanosine monophosphate sodium, bombesin) had no effect on the cat urethral smooth muscles.
mesh_terms: D000818:Animals; D001337:Autonomic Agents / Q000494:pharmacology*; D001920:Bradykinin / Q000494:pharmacology; D002415:Cats; D015237:Dinoprost; D015232:Dinoprostone; D005260:Female; D066298:In Vitro Techniques; D007213:Indomethacin / Q000494:pharmacology; D008297:Male; D009119:Muscle Contraction / Q000187:drug effects*; D009130:Muscle, Smooth / Q000187:drug effects*; D011458:Prostaglandins E / Q000494:pharmacology; D011460:Prostaglandins F / Q000494:pharmacology; D013373:Substance P / Q000494:pharmacology; D014521:Urethra / Q000187:drug effects* / Q000294:innervation
chemical_list: D001337:Autonomic Agents; D011458:Prostaglandins E; D011460:Prostaglandins F; D013373:Substance P; D015237:Dinoprost; D015232:Dinoprostone; D001920:Bradykinin; D007213:Indomethacin