PAR-2 activation in intestinal epithelial cells potentiates interleukin-1beta-induced chemokine secretion via MAP kinase signaling pathways.
Cytokine
; 31(5): 358-67, 2005 Sep 07.
Article
en En
| MEDLINE
| ID: mdl-16095910
Intestinal epithelial cells can be induced to secrete the chemokine interleukin (IL)-8 during inflammation. The PAR-2 receptor is believed to play a proinflammatory role and is expressed in gut epithelial cells. The aim was to investigate PAR-2 signaling in Caco-2 intestinal epithelial cells, with respect to chemokine secretion. Activation of PAR-2 by high concentrations of the synthetic activating peptide (SLIGKV) did not induce secretion of IL-8, in contrast to stimulation with IL-1beta. However, upon simultaneous treatment with activating peptide and IL-1beta, a potentiating effect of PAR-2 stimulation was seen, resulting in a fivefold increase of IL-8. Available data suggest that NF-kappaB activation is required for IL-8 gene expression. Unlike IL-1beta, PAR-2 stimulation did not activate NF-kappaB, which may explain the lack of IL-8 expression. However, PAR-2 stimulation led to rapid phosphorylation of two MAP kinases, p38 MAPK and ERK1/2. ERK1/2 is known to activate the transcription factor AP-1, also involved in upregulation of IL-8 gene transcription. Inhibition of p38 MAPK led to decreased IL-8 following stimulation with IL-1beta and/or activating peptide. These results suggest that maximal IL-8 expression requires coordination of several signaling pathways. Thus, identifying antagonists to the PAR-2 receptor may be beneficial by inhibiting potentiation of a proinflammatory response, through inhibition of p38 and ERK MAP kinases.
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Interleucina-1
/
Sistema de Señalización de MAP Quinasas
/
Receptor PAR-2
/
Células Epiteliales
/
Intestinos
Tipo de estudio:
Prognostic_studies
Límite:
Animals
/
Humans
Idioma:
En
Revista:
Cytokine
Asunto de la revista:
ALERGIA E IMUNOLOGIA
Año:
2005
Tipo del documento:
Article
País de afiliación:
Suecia
Pais de publicación:
Reino Unido