title: Changes of proteasomes and cathepsins activities and their expression during differentiation of C2C12 myoblasts.
abstract: C2C12 myoblasts fuse to form multinucleated myotubes and express muscle specific proteins during differentiation. To elucidate developmental regulation of intracellular proteolytic systems, enzymatic activities, protein and mRNA levels of proteasomes (20S and 26S) and lysosomal cathepsins (B, L, and H) were examined. Myoblasts were differentiated fully to myotubes 6 days after starting differentiation. In this developmental process, the 26S proteasome activity decreased, while the 20S proteasome activity increased. Expression of proteasome subunits of 20S (RC2, RC8) and regulatory components of 26S (S4, S7) was down-regulated, though total protein levels of proteasomes showed no remarkable changes. On the other hand, enzymatic activities of cathepsins B and B + L increased in association with an increase of their transcriptional and translational levels. Expression of their specific endogenous inhibitor, cystatin beta, also increased. Maturation of the lysosomal proteolytic system was tightly linked to the differentiation process. These results suggested that signals for differentiation of myoblasts mediate a change of intracellular proteolytic systems, involving up-regulation of lysosomal cathepsins and down-regulation of proteasomes.
authors.affiliation: Department of Surgery II, Osaka University Medical School.
authors.forename: C
authors.initials: C
authors.lastname: Ebisui
authors.forename: T
authors.initials: T
authors.lastname: Tsujinaka
authors.forename: T
authors.initials: T
authors.lastname: Morimoto
authors.forename: J
authors.initials: J
authors.lastname: Fujita
authors.forename: A
authors.initials: A
authors.lastname: Ogawa
authors.forename: K
authors.initials: K
authors.lastname: Ishidoh
authors.forename: E
authors.initials: E
authors.lastname: Kominami
authors.forename: K
authors.initials: K
authors.lastname: Tanaka
authors.forename: M
authors.initials: M
authors.lastname: Monden
mesh_terms: D000818:Animals; D002401:Cathepsin B / Q000235:genetics / Q000378:metabolism; D056655:Cathepsin H; D056668:Cathepsin L; D002403:Cathepsins / Q000235:genetics / Q000378:metabolism / Q000502:physiology*; D002454:Cell Differentiation / Q000502:physiology; D002478:Cells, Cultured; D003546:Cysteine Endopeptidases / Q000235:genetics / Q000502:physiology*; D010450:Endopeptidases; D015870:Gene Expression; D051379:Mice; D009097:Multienzyme Complexes / Q000235:genetics / Q000502:physiology*; D018482:Muscle, Skeletal / Q000166:cytology* / Q000502:physiology*; D046988:Proteasome Endopeptidase Complex; D014176:Protein Biosynthesis
chemical_list: D009097:Multienzyme Complexes; D002403:Cathepsins; D010450:Endopeptidases; D003546:Cysteine Endopeptidases; D002401:Cathepsin B; D056668:Cathepsin L; C534278:Ctsl protein, mouse; D056655:Cathepsin H; C534127:Ctsh protein, mouse; D046988:Proteasome Endopeptidase Complex