The p38-mediated rapid down-regulation of cell surface gp130 expression impairs interleukin-6 signaling in the synovial fluid of juvenile idiopathic arthritis patients.
Arthritis Rheumatol
; 66(2): 470-8, 2014 Feb.
Article
em En
| MEDLINE
| ID: mdl-24504821
ABSTRACT
OBJECTIVE:
Interleukin-6 (IL-6) signaling plays an important proinflammatory role, but this role is restricted by regulatory mechanisms that, for example, reduce the cell surface availability of the signal-transducing chain of the IL-6 receptor, gp130. The aim of this study was to determine whether the inflammatory environment in arthritic joints has an impact on monocytic gp130 surface expression and the extent to which regulatory processes in the synovial fluid (SF) can be reproduced in an in vitro model.METHODS:
Flow cytometry and live cell imaging were used to measure the cell surface expression and internalization of gp130. STAT-3 phosphorylation was monitored by flow cytometry and Western blotting.RESULTS:
In patients with juvenile idiopathic arthritis (JIA), levels of cell surface gp130 expression in SF monocytes were reduced compared to those in peripheral blood (PB) monocytes. These reduced levels were reproduced when PB monocytes from healthy donors were stimulated with SF, and this reduction was dependent on p38 MAPK. The induction of p38 by IL-1ß in PB monocytes interfered with IL-6 signaling due to the reduced cell surface expression of gp130.CONCLUSION:
These results suggest that p38-mediated proinflammatory stimuli induce the down-regulation of gp130 on monocytes and thus restrict gp130-mediated signal transduction. This regulatory mechanism could be of relevance to processes in the inflamed joints of patients with JIA.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Artrite Juvenil
/
Líquido Sinovial
/
Transdução de Sinais
/
Regulação para Baixo
/
Interleucina-6
/
Proteínas Quinases p38 Ativadas por Mitógeno
/
Receptor gp130 de Citocina
Tipo de estudo:
Prognostic_studies
Limite:
Adolescent
/
Child
/
Humans
Idioma:
En
Revista:
Arthritis Rheumatol
Ano de publicação:
2014
Tipo de documento:
Article
País de afiliação:
Alemanha