Increased expression and activation of IL-12-induced Stat4 signaling in the mucosa of ulcerative colitis patients.
Cell Immunol
; 248(2): 115-20, 2007 Aug.
Article
em En
| MEDLINE
| ID: mdl-18048021
ABSTRACT
Inflammatory bowel diseases (IBD), including Crohn's disease (CD) and ulcerative colitis (UC), are chronic inflammatory diseases with unsolved pathogenesis. Imbalanced Th1/Th2 may play a role in the sustained inflammation of IBD. In China, CD is rare but the incidence of UC has been rising steadily in the last two decades. We investigated the expression of IL-12 (p40) and IFN-gamma, and the activational state of Stat4 signaling in mucosal tissues at the site of disease from 30 active UC patients in comparison with 30 healthy controls. RT-PCR analyses revealed increased mRNA expression of IL-12 (p40) but not IFN-gamma in UC patients. Western blot analyses discovered, for the first time, increased levels of constitutive Stat4 in the cytoplasm and phosphorylated Stat4 in the nucleus of mucosal cells from UC patients. We conclude that a heightened, perhaps persistent, activational state of IL-12/Stat4, and/or IL-23/Stat4 signaling may be present in active Chinese UC patients, and possibly involved in chronic inflammation in UC.
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Base de dados:
MEDLINE
Assunto principal:
Transdução de Sinais
/
Colite Ulcerativa
/
Regulação para Cima
/
Fator de Transcrição STAT4
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Subunidade p40 da Interleucina-12
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Mucosa Intestinal
Limite:
Adult
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Aged
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Female
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Humans
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Male
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Middle aged
Idioma:
En
Ano de publicação:
2007
Tipo de documento:
Article