Cell Transdifferentiation; Fibroblasts/metabolism; MicroRNAs/metabolism; Myocytes, Cardiac/metabolism; Animals; Cell Transdifferentiation/drug effects; Cell Transdifferentiation/genetics; Cells, Cultured; Disease Models, Animal; Fibroblasts/drug effects; Fibroblasts/pathology; Gene Expression Regulation; Genetic Therapy/methods; Janus Kinase 1/antagonists & inhibitors; Janus Kinase 1/metabolism; Luminescent Proteins/genetics; Luminescent Proteins/metabolism; Male; Mice; Mice, Inbred C57BL; Mice, Transgenic; MicroRNAs/administration & dosage; Myocardial Contraction; Myocardial Ischemia/genetics; Myocardial Ischemia/metabolism; Myocardial Ischemia/pathology; Myocardial Ischemia/physiopathology; Myocardial Ischemia/therapy; Myocytes, Cardiac/drug effects; Myocytes, Cardiac/pathology; Protein Kinase Inhibitors/pharmacology; Recovery of Function; Regeneration; S100 Proteins/genetics; S100 Proteins/metabolism; Transfection; Red Fluorescent Protein