Changes of proteasomes and cathepsins activities and their expression during differentiation of C2C12 myoblasts.
J Biochem
; 117(5): 1088-94, 1995 May.
Article
em En
| MEDLINE
| ID: mdl-8586624
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.
Buscar no Google
Base de dados:
MEDLINE
Assunto principal:
Endopeptidases
/
Cisteína Endopeptidases
/
Catepsinas
/
Músculo Esquelético
/
Complexos Multienzimáticos
Limite:
Animals
Idioma:
En
Ano de publicação:
1995
Tipo de documento:
Article