Characteristics and drug responses of cochlear and vestibular adenylate cyclase.
Adenylate cyclase activity of dissected cochlear and vestibular structures was assayed with the ATP-analog adenylyl imidodiphosphate as substrate. High activities (per mg protein) were found in stria vascularis and in vestibular preparations, lower activities in spiral ligament, VIIIth nerve, and organ of Corti. The enzyme from all structures was stimulated by fluoride, guanylyl imidodiphasphate or manganese(II) ions, and strongly inhibited by ethacrynate and lead ion. The anti-cancer drug cis-diammine-dichloro platinum significantly inhibited adenylate cyclase from stria vascularis.
D000067956:Adenylyl Cyclase Inhibitors; D000262:Adenylyl Cyclases / Q000032:analysis*; D000818:Animals; D002413:Cations, Divalent; D002945:Cisplatin / Q000494:pharmacology; D003051:Cochlea / Q000187:drug effects / Q000201:enzymology*; D004976:Ethacrynic Acid / Q000494:pharmacology; D006160:Guanosine Triphosphate / Q000494:pharmacology; D006168:Guinea Pigs; D014722:Vestibule, Labyrinth / Q000187:drug effects / Q000201:enzymology*
D000067956:Adenylyl Cyclase Inhibitors; D002413:Cations, Divalent; D006160:Guanosine Triphosphate; D000262:Adenylyl Cyclases; D004976:Ethacrynic Acid; D002945:Cisplatin