Myocytes, CardiacMyocardiumHeartCells, CulturedAnimals, NewbornCardiomegalyMyocardial ContractionRats, Sprague-DawleyHeart VentriclesRats, WistarCalciumMitochondria, HeartMyocardial Reperfusion InjuryCardiotonic AgentsSarcomeresEmbryonic Stem CellsCell SizeGATA4 Transcription FactorSignal TransductionCell DifferentiationCalcium Channels, L-TypeIsoproterenolApoptosisHypertrophyConnexin 43Muscle CellsMice, TransgenicCalcium SignalingSarcoplasmic Reticulum Calcium-Transporting ATPasesSarcolemmaCardiac MyosinsSodium-Calcium ExchangerCardiomyopathiesMyocardial IschemiaMyoblasts, CardiacMuscle ProteinsVentricular MyosinsVentricular RemodelingAdrenergic beta-AgonistsSarcoplasmic ReticulumHeart FailureInduced Pluripotent Stem CellsReactive Oxygen SpeciesCardiomyopathy, DilatedMice, Inbred C57BLCell HypoxiaAtrial Natriuretic FactorMicroscopy, ConfocalExcitation Contraction CouplingTime FactorsCell SurvivalMyocardial InfarctionRegenerationPatch-Clamp TechniquesPhosphorylationPhenylephrineEnzyme ActivationAdenoviridaeRNA, MessengerCytoprotectionDisease Models, AnimalMice, KnockoutMembrane Potential, MitochondrialGene Expression RegulationHeart AtriaBlotting, WesternL-Lactate DehydrogenaseGene ExpressionStem CellsAction PotentialsMyofibrilsAngiotensin IIEndothelin-1Caspase 3Reverse Transcriptase Polymerase Chain ReactionRyanodine Receptor Calcium Release ChannelCell LineEnzyme InhibitorsArrhythmias, CardiacDiacetylOxidative StressModels, AnimalDose-Response Relationship, DrugReceptors, Adrenergic, beta-1Hydrogen PeroxideMyosin Heavy ChainsImmunohistochemistryCell EnlargementHeart DiseasesTroponin ICell Culture TechniquesGap JunctionsIschemic Preconditioning, MyocardialUp-RegulationIn Situ Nick-End LabelingReceptors, Adrenergic, betaFibrosisDesminProtein Kinase CCalcineurin