Myocytes, CardiacMyocardiumCells, CulturedRats, Sprague-DawleyRats, WistarHeartMyocardial ContractionHSP20 Heat-Shock ProteinsCardiomegalyMitochondria, HeartCardiotonic AgentsCalciumCalcium SignalingHeart VentriclesAnimals, NewbornCytosolEnzyme ActivationCell SizeAdrenergic beta-1 Receptor AgonistsHypertrophyDiacetylMyocardial Reperfusion InjurySarcomeresIsoproterenolSignal TransductionApoptosisSarcolemmaConnexin 43Sodium-Calcium ExchangerCalcium Channels, L-TypeEndothelin-1Time FactorsAdrenergic beta-AgonistsSarcoplasmic Reticulum Calcium-Transporting ATPasesCell HypoxiaRNA, MessengerPhenylephrineMuscle CellsAtrial Natriuretic FactorSarcoplasmic ReticulumReceptors, Adrenergic, beta-1L-Lactate DehydrogenaseReactive Oxygen SpeciesAngiotensin IIMicroscopy, ConfocalAdenoviridaeDose-Response Relationship, DrugCaspase 3Patch-Clamp TechniquesGATA4 Transcription FactorMyocardial IschemiaMuscle ProteinsBlotting, WesternPhosphorylationEnzyme InhibitorsCardiotoxinsCell SurvivalGene Expression RegulationGene ExpressionProtein Kinase C-epsilonAdrenergic alpha-AgonistsMyofibrilsCell EnlargementCell DifferentiationMembrane Potential, MitochondrialDiiodothyroninesDisease Models, AnimalAnoxiaCardiomyopathy, DilatedReverse Transcriptase Polymerase Chain ReactionCardiomyopathiesProtein Kinase CReceptors, Adrenergic, alpha-1CytoprotectionReceptors, Adrenergic, betaOxidative StressImmunohistochemistryMice, TransgenicCalcium-Binding ProteinsHeart FailureHydrogen PeroxideAction PotentialsAdenosine TriphosphateGap JunctionsArrhythmias, CardiacEmbryonic Stem CellsModels, AnimalCaffeineUp-RegulationTransfectionRyanodine Receptor Calcium Release ChannelCell LineMyosin Heavy ChainsBenzophenanthridinesCell DeathFluorescent DyesCell SeparationCyclic AMPMicroscopy, FluorescenceMyocardial Infarction