Secretion of macrophage urokinase plasminogen activator is dependent on proteoglycans.
Eur J Biochem
; 270(19): 3971-80, 2003 Oct.
Article
em En
| MEDLINE
| ID: mdl-14511379
ABSTRACT
The importance of proteoglycans for secretion of proteolytic enzymes was studied in the murine macrophage cell line J774. Untreated or 4beta-phorbol 12-myristate 13-acetate (PMA)-stimulated macrophages were treated with hexyl-beta-d-thioxyloside to interfere with the attachment of glycosaminoglycan chains to their respective protein cores. Activation of the J774 macrophages with PMA resulted in increased secretion of trypsin-like serine proteinase activity. This activity was completely inhibited by plasminogen activator inhibitor 1 and by amiloride, identifying the activity as urokinase plasminogen activator (uPA). Treatment of both the unstimulated or PMA-stimulated macrophages with xyloside resulted in decreased uPA activity and Western blotting analysis revealed an almost complete absence of secreted uPA protein after xyloside treatment of either control- or PMA-treated cells. Zymography analyses with gels containing both gelatin and plasminogen confirmed these findings. The xyloside treatment did not reduce the mRNA levels for uPA, indicating that the effect was at the post-translational level. Treatment of the macrophages with xylosides did also reduce the levels of secreted matrix metalloproteinase 9. Taken together, these findings indicate a role for proteoglycans in the secretion of uPA and MMP-9.
Buscar no Google
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Proteoglicanas
/
Ativador de Plasminogênio Tipo Uroquinase
/
Macrófagos
Tipo de estudo:
Prognostic_studies
Limite:
Animals
Idioma:
En
Ano de publicação:
2003
Tipo de documento:
Article