title: MicroRNA-1 facilitates skeletal myogenic differentiation without affecting osteoblastic and adipogenic differentiation.
abstract: MicroRNAs (miRNAs) are small non-coding RNAs emerging as important post-transcriptional gene regulators. In this study, we examined the role of miR-1, an miRNA specifically expressed in cardiac and skeletal muscle tissue, on the myogenic, osteoblastic, and adipogenic differentiation of C2C12 cells. Upon induction of myogenic differentiation, miR-1 was robustly expressed. Retrovirus-mediated overexpression of miR-1 markedly enhanced expression of muscle creatine kinase, sarcomeric myosin, and alpha-actinin, while the effects on myogenin and MyoD expression were modest. Formation of myotubes was significantly augmented in miR-1-overexpressing cells, indicating miR-1 expression enhanced not only myogenic differentiation but also maturation into myotubes. In contrast, osteoblastic and adipogenic differentiation was not affected by forced expression of miR-1. Thus, the muscle-specific miRNA, miR-1, plays important roles in controlling myogenic differentiation and maturation in lineage-committed cells, rather than functioning in fate determination.
authors.affiliation: Department of Cardiovascular Medicine, Kyoto Prefectural University of Medicine, Kyoto 602-8566, Japan.
authors.forename: Norio
authors.initials: N
authors.lastname: Nakajima
authors.forename: Tomosaburo
authors.initials: T
authors.lastname: Takahashi
authors.forename: Ryoji
authors.initials: R
authors.lastname: Kitamura
authors.forename: Koji
authors.initials: K
authors.lastname: Isodono
authors.forename: Satoshi
authors.initials: S
authors.lastname: Asada
authors.forename: Tomomi
authors.initials: T
authors.lastname: Ueyama
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Matsubara
authors.forename: Hidemasa
authors.initials: H
authors.lastname: Oh
mesh_terms: D041721:3T3-L1 Cells; D017667:Adipocytes / Q000166:cytology* / Q000502:physiology*; D000818:Animals; D002454:Cell Differentiation; D002460:Cell Line; D051379:Mice; D035683:MicroRNAs / Q000235:genetics*; D018485:Muscle Fibers, Skeletal / Q000166:cytology* / Q000502:physiology*; D018482:Muscle, Skeletal / Q000166:cytology / Q000502:physiology; D010006:Osteoblasts / Q000166:cytology* / Q000502:physiology*
chemical_list: D035683:MicroRNAs