Induction of matrix metalloproteinase-9 (MMP-9) in lipopolysaccharide-stimulated primary astrocytes is mediated by extracellular signal-regulated protein kinase 1/2 (Erk1/2).
Glia
; 41(1): 15-24, 2003 Jan.
Article
em En
| MEDLINE
| ID: mdl-12465042
ABSTRACT
In the present study, we investigated whether the activation of protein kinase C (PKC) and extracellular signal-regulated kinase 1/2 (Erk1/2) are involved in the induction of MMP-9 in lipopolysaccharide (LPS)-stimulated primary astrocytes. The expression of MMP-9 but not MMP-2 was increased by LPS. LPS treatment induced activation of Erk1/2 within 30 min, which was dose-dependently inhibited by PD98059, a specific inhibitor of the Erk kinase (MEK). In this condition, PD98059 blocked the increase in MMP-9 protein and mRNA level as well as gelatin-digesting activity. Inhibition of PKC activity blocked the LPS-induced activation of Erk1/2 as well as MMP-9 expression. In addition, activation of PKC by phorbol myristoyl acetate (PMA) activated Erk1/2 with concomitant increase in MMP-9 production. Moreover, treatment of PD98059 dose-dependently decreased the PMA-induced MMP-9 expression. The results from the present study suggest that induction of MMP-9 by LPS in rat primary astrocytes is mediated, at least in part, by the sequential activation of PKC and Erk1/2. The Erk1/2-mediated MMP-9 induction may provide insights into the regulation of MMP-9 production in CNS, which may occur in vivo in pathological situations such as CNS inflammation.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Lipopolissacarídeos
/
Astrócitos
/
Proteína Quinase 1 Ativada por Mitógeno
/
Metaloproteinase 9 da Matriz
/
Proteínas Quinases Ativadas por Mitógeno
Limite:
Animals
Idioma:
En
Revista:
Glia
Assunto da revista:
NEUROLOGIA
Ano de publicação:
2003
Tipo de documento:
Article