Myocytes, CardiacAnimals, NewbornCells, CulturedMyocardiumRats, Sprague-DawleyCardiomegalyRats, WistarAdrenergic beta-1 Receptor AgonistsHeartHypertrophyDiiodothyroninesMyocardial ContractionCell SizeCardiotonic AgentsCalciumEndothelin-1Connexin 43Receptors, Adrenergic, beta-1Mitochondria, HeartPhenylephrineApoptosisCell EnlargementSignal TransductionCell HypoxiaAngiotensin IIIsoproterenolAtrial Natriuretic FactorAdrenergic alpha-AgonistsL-Lactate DehydrogenaseAdenoviridaeCaspase 3Reactive Oxygen SpeciesMyocardial Reperfusion InjuryRNA, MessengerBlotting, WesternDose-Response Relationship, DrugAdrenergic beta-AgonistsMembrane Potential, MitochondrialTime FactorsEnzyme ActivationGene ExpressionMicroscopy, ConfocalMuscle ProteinsCell SurvivalGene Expression RegulationEnzyme InhibitorsPhosphorylationHeart VentriclesOxidative StressAntioxidantsTransfectionReverse Transcriptase Polymerase Chain ReactionDisease Models, AnimalProto-Oncogene Proteins c-aktSarcomeresUp-RegulationDiacetylCalcium Channels, L-TypeSodium-Calcium ExchangerSarcolemmaMuscle CellsCalcium SignalingSarcoplasmic Reticulum Calcium-Transporting ATPasesPatch-Clamp TechniquesGATA4 Transcription FactorSarcoplasmic ReticulumMyocardial IschemiaAnoxiaProtein Kinase C-epsilonMyofibrilsProtein Kinase CCardiotoxinsAction PotentialsReceptors, Adrenergic, alpha-1Cell DifferentiationCytoprotectionReceptors, Adrenergic, betaCardiomyopathy, DilatedGap JunctionsCardiomyopathiesCytosolArrhythmias, CardiacMembrane PotentialsHydrogen PeroxideAdenosine TriphosphateMice, TransgenicCalcium-Binding ProteinsHeart FailureImmunohistochemistryCalcineurinMyosin Heavy ChainsModels, AnimalIn Situ Nick-End LabelingCell DeathElectric StimulationModels, CardiovascularMicroscopy, FluorescenceHSP20 Heat-Shock ProteinsCaffeineFluorescent Dyes