Phosphodiesterase Inhibitors1-Methyl-3-isobutylxanthine3',5'-Cyclic-AMP PhosphodiesterasesRolipramPhosphoric Diester HydrolasesPurinones4-(3-Butoxy-4-methoxybenzyl)-2-imidazolidinoneCyclic AMP3',5'-Cyclic-GMP PhosphodiesterasesCyclic Nucleotide Phosphodiesterases, Type 4TheophyllinePhosphodiesterase 3 InhibitorsPhosphodiesterase 4 InhibitorsCyclic GMPMilrinoneCyclic Nucleotide Phosphodiesterases, Type 3Phosphodiesterase 5 InhibitorsPapaverinePyrrolidinonesCyclic Nucleotide Phosphodiesterases, Type 5Phosphodiesterase ICyclic Nucleotide Phosphodiesterases, Type 12',3'-Cyclic-Nucleotide PhosphodiesterasesColforsinPentoxifyllineBucladesineSulfonesXanthines8-Bromo Cyclic Adenosine MonophosphateNucleotides, CyclicPyridazinesAdenylate CyclasePurinesIsoproterenolEnoximoneKineticsVinca AlkaloidsDose-Response Relationship, DrugAmrinoneAminophyllineCyclic AMP-Dependent Protein KinasesBufo bufoCyclic Nucleotide Phosphodiesterases, Type 2Cells, CulturedPhotoreceptor CellsCyclic Nucleotide Phosphodiesterases, Type 6CalciumDibutyryl Cyclic GMPPiperazinesProteasome Endopeptidase ComplexEnzyme ActivationGuanylate CyclaseDipyridamoleAlprostadilErectile DysfunctionPyridonesThionucleotidesAdenosinePhthalazinesPhenylisopropyladenosineMolecular Sequence DataGuinea PigsCattleCyclic Nucleotide Phosphodiesterases, Type 7Second Messenger SystemsNitric OxideProstaglandins ICyclic GMP-Dependent Protein KinasesStimulation, ChemicalRats, Inbred StrainsIsoquinolinesPenile ErectionSignal TransductionHydrolysisCell LineTime FactorsProstaglandins E, SyntheticVasodilator AgentsImidazolesTransducinNitroprussideEnzyme InhibitorsTetrazolesIsoenzymesCholera ToxinProteolysisNicotinic AcidsAmino Acid SequenceTriazinesIloprostPhosphorylationRod Cell Outer SegmentUbiquitinReceptors, Adrenergic, betaRats, WistarOxadiazolesRNA, MessengerRats, Sprague-DawleyBiodegradation, EnvironmentalAdrenergic beta-Agonists