Myocytes, CardiacMyocardiumCells, CulturedHeartAnimals, NewbornCardiomegalyCell Culture TechniquesMyocardial ContractionRats, Sprague-DawleyCell DifferentiationApoptosisCell LineCell SurvivalSignal TransductionHeart VentriclesCell Line, TumorCell ProliferationRats, WistarCalciumMitochondria, HeartMice, Inbred C57BLMice, TransgenicBlotting, WesternRNA, MessengerImmunohistochemistryMyocardial Reperfusion InjuryCardiotonic AgentsSarcomeresEmbryonic Stem CellsTime FactorsTissue EngineeringReverse Transcriptase Polymerase Chain ReactionCell MovementCell ShapeCell SizeGATA4 Transcription FactorDisease Models, AnimalMicroscopy, ConfocalCell DivisionCalcium Channels, L-TypeTransfectionIsoproterenolReactive Oxygen SpeciesBiocompatible MaterialsGene ExpressionHypertrophyMice, NudePhosphorylationStem CellsConnexin 43Gene Expression RegulationMuscle CellsUp-RegulationDose-Response Relationship, DrugCalcium SignalingSarcoplasmic Reticulum Calcium-Transporting ATPasesSarcolemmaCell AdhesionFibroblastsCardiac MyosinsTumor Cells, CulturedEnzyme InhibitorsMicroscopy, FluorescenceSodium-Calcium ExchangerCardiomyopathiesMyocardial IschemiaModels, BiologicalMyoblasts, CardiacMuscle ProteinsVentricular MyosinsVentricular RemodelingAdrenergic beta-AgonistsTransplantation, HeterologousCell DeathSarcoplasmic ReticulumHeart FailureInduced Pluripotent Stem CellsFlow CytometryRNA, Small InterferingRNA InterferenceCardiomyopathy, DilatedTissue ScaffoldsCell HypoxiaAtrial Natriuretic FactorDown-RegulationExcitation Contraction CouplingNeoplasm TransplantationMice, Inbred BALB CFluorescent Antibody TechniqueMyocardial InfarctionRegenerationNeoplasm InvasivenessPatch-Clamp TechniquesRabbitsPhenylephrineEnzyme ActivationNeoplasms, ExperimentalAdenoviridaePolymersToxicity Tests