Myocytes, CardiacMyocardiumCells, CulturedAnimals, NewbornRats, Sprague-DawleyCardiomegalyHeartRats, WistarMyocardial ContractionCalciumEmbryo, MammalianHeart VentriclesMitochondria, HeartCell SizeCardiotonic AgentsHypertrophyCell DifferentiationSignal TransductionMyocardial Reperfusion InjuryApoptosisSarcomeresGATA4 Transcription FactorCell SurvivalIsoproterenolSarcoplasmic Reticulum Calcium-Transporting ATPasesNeuronsTime FactorsRNA, MessengerMuscle CellsConnexin 43Calcium SignalingStem CellsPatch-Clamp TechniquesAtrial Natriuretic FactorSodium-Calcium ExchangerCalcium Channels, L-TypeCardiomyopathiesSarcolemmaAdrenergic beta-1 Receptor AgonistsCell EnlargementGene Expression RegulationMyocardial IschemiaVentricular RemodelingPhenylephrineEndothelin-1Mice, TransgenicDose-Response Relationship, DrugReactive Oxygen SpeciesDiacetylAdrenergic beta-AgonistsImmunohistochemistryEmbryonic Stem CellsCell HypoxiaGene Expression3-Mercaptopropionic AcidMuscle ProteinsSarcoplasmic ReticulumAdenoviridaeCaspase 3Enzyme ActivationAngiotensin IIHeart FailurePhosphorylationCell LineReceptors, Adrenergic, beta-1L-Lactate DehydrogenaseCardiomyopathy, DilatedVentricular MyosinsBlotting, WesternMembrane PotentialsMicroscopy, ConfocalSpinal CordDisease Models, AnimalCardiotoxinsMyocardial InfarctionEnzyme InhibitorsMembrane Potential, MitochondrialMice, Inbred C57BLCardiac MyosinsMyoblasts, CardiacOxidative StressMyofibrilsMyosin Heavy ChainsReverse Transcriptase Polymerase Chain ReactionCytoprotectionProtein Kinase C-epsilonMice, KnockoutIn Situ Nick-End LabelingCalcineurinModels, AnimalExcitation Contraction CouplingHydrogen PeroxideRegenerationArrhythmias, CardiacProto-Oncogene Proteins c-aktCalcium-Binding ProteinsReceptors, Adrenergic, betaProtein Kinase COrgan Culture TechniquesUp-Regulation