title: Constant expression of mouse calpastatin isoforms during differentiation in myoblast cell line, C2C12.
abstract: C2C12 is a myoblast cell line which is used to studydifferentiation into multinucleated cells in vitro. Addition of calpain inhibitors, calpeptin orE-64d, to the culture medium prevented the myoblasticfusion of C2C12 cells. Immunoblot studies usingaffinity-purified antibody, revealed that the expressedlevels of mouse calpastatin remained unaltered duringC2C12 cell fusion. The detected calpastatin migratedas a protein of 130 kDa on SDS-polyacrylamide gelelectrophoresis. The estimated molecular mass wassomewhat greater than that in mouse liver anderythrocytes, and much greater than that reported inrat myoblasts. The 130 kDa isoform may contain anadditional N-terminal region designated XL domainfound in bovine calpastatin.
authors.affiliation: Lab of Molecular and Cellular Regulation, Department of Applied Molecular Biosciences, Graduate School of Bioagricultural Sciences, Nagoya University, Chikusa, Nagoya, 464-8601, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Hitomi
authors.forename: M
authors.initials: M
authors.lastname: Murase
authors.forename: T
authors.initials: T
authors.lastname: Kawamura
authors.forename: M
authors.initials: M
authors.lastname: Maki