Second Messenger SystemsCyclic AMPColforsinCalciumAdenylate CyclaseProtein Kinase CPhosphatidylinositolsInositol PhosphatesBucladesineRNA, MessengerSignal TransductionTetradecanoylphorbol AcetateCells, CulturedRats, Sprague-DawleyKineticsCell LineInositol 1,4,5-Trisphosphate8-Bromo Cyclic Adenosine Monophosphate1-(5-Isoquinolinesulfonyl)-2-MethylpiperazineCalcimycinPhorbol EstersIsoquinolinesCyclic AMP-Dependent Protein KinasesDinoprostEnzyme ActivationCyclic GMPMembrane PotentialsDose-Response Relationship, DrugNeuronsCyclic ADP-Ribose