[A novel molecular mechanism of interferon alpha-regulated expression of retinoic acid-induced gene G].
Zhonghua Zhong Liu Za Zhi
; 32(2): 88-92, 2010 Feb.
Article
em Zh
| MEDLINE
| ID: mdl-20403236
ABSTRACT
OBJECTIVE:
To investigate the molecular mechanisms by which IFN-alpha regulated retinoic acid-induced gene G (RIG-G) expression.METHODS:
The expression of STAT1, p-STAT1 and RIG-G in IFN-alpha-treated NB4 cells was detected by Western blot. The roles of STAT1, STAT2 and IRF-9 in IFN-alpha-induced RIG-G expression were analyzed in STAT1-null U3A cells by cell transfection, reporter gene assay, co-immunoprecipitation and chromatin immunoprecipitaion.RESULTS:
In U3A cells, only when STAT2 and IRF-9 were co-transfected, the luciferase activities of RIG-G promoter-containing reporter gene could be highly increased about 8-fold compared with that in the control group. Moreover, in the absence of IFN-alpha, similar effects were observed in either IRF-9 co-transfected with wild type or mutant form of STAT2, whereas IFN-alpha could increase the transactivation activity of wild type STAT2 and IRF-9 by 6-fold compared with that without IFN-alpha, but had no effect on mutant STAT2. In addition, STAT2 could interact with IRF-9 and bind to the RIG-G promoter.CONCLUSION:
STAT2 may interact with IRF-9 in a STAT1-independent manner. The complex STAT2/IRF-9 is the key factor mediating the expression of RIG-G gene regulated by IFN-alpha. This is a novel signal transduction cascade for IFN which is different from the classical JAK-STAT pathway.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Interferon-alfa
/
Peptídeos e Proteínas de Sinalização Intracelular
/
Fator de Transcrição STAT1
/
Fator de Transcrição STAT2
/
Fator Gênico 3 Estimulado por Interferon, Subunidade gama
Limite:
Humans
Idioma:
Zh
Revista:
Zhonghua Zhong Liu Za Zhi
Ano de publicação:
2010
Tipo de documento:
Article
País de afiliação:
China