Myocytes, CardiacMyocardiumCardiomegalyHeartCells, CulturedMyocardial ContractionAnimals, NewbornRats, Sprague-DawleyHeart VentriclesGATA4 Transcription FactorHypertrophyMitochondria, HeartVentricular RemodelingApoptosisCell SizeRats, WistarMyocardial Reperfusion InjurySignal TransductionCalciumSarcomeresCardiotonic AgentsCardiomyopathiesMice, TransgenicSarcoplasmic Reticulum Calcium-Transporting ATPasesEmbryonic Stem CellsVentricular MyosinsCell DifferentiationMuscle CellsCell EnlargementHeart FailureCalcium SignalingIsoproterenolMyoblasts, CardiacCardiac MyosinsMyocardial IschemiaConnexin 43Atrial Natriuretic FactorMice, Inbred C57BLMyocardial InfarctionFibrosisDisease Models, AnimalMuscle ProteinsMice, KnockoutExcitation Contraction CouplingPhenylephrineRegenerationCardiomyopathy, DilatedCell SurvivalGene Expression RegulationReactive Oxygen SpeciesSodium-Calcium ExchangerMyosin Heavy ChainsCalcium Channels, L-TypeIn Situ Nick-End LabelingSarcolemmaHeart InjuriesPhosphorylationAdenoviridaeTime FactorsCaspase 3Endothelin-1Blotting, WesternAdrenergic beta-AgonistsOxidative StressSarcoplasmic ReticulumRNA, MessengerHeart DiseasesEnzyme ActivationCalcineurinStem CellsAngiotensin IICell HypoxiaModels, AnimalReverse Transcriptase Polymerase Chain ReactionGene ExpressionProto-Oncogene Proteins c-aktCytoprotectionCell ProliferationMembrane Potential, MitochondrialHypertrophy, Left VentricularCardiotoxinsEnzyme InhibitorsDiabetic CardiomyopathiesInduced Pluripotent Stem CellsCell DeathL-Lactate DehydrogenaseNecrosisCell LineReceptors, Adrenergic, beta-1MyofibrilsMicroscopy, ConfocalHeart AtriaFetal HeartUp-RegulationImmunohistochemistryHydrogen PeroxideVentricular Function, LeftCell Culture TechniquesCalcium-Binding ProteinsGene Expression Regulation, Developmental