Zao-zhong Su and Devanand Sarkar contributed equally to this study.
Central role of interferon regulatory factor-1 (IRF-1) in controlling retinoic acid inducible gene-I (RIG-I) expression†
Article first published online: 21 MAY 2007
Copyright © 2007 Wiley-Liss, Inc.
Journal of Cellular Physiology
Volume 213, Issue 2, pages 502–510, November 2007
How to Cite
Su, Z.-Z., Sarkar, D., Emdad, L., Barral, P. M. and Fisher, P. B. (2007), Central role of interferon regulatory factor-1 (IRF-1) in controlling retinoic acid inducible gene-I (RIG-I) expression. J. Cell. Physiol., 213: 502–510. doi: 10.1002/jcp.21128
- Issue published online: 27 AUG 2007
- Article first published online: 21 MAY 2007
- Manuscript Accepted: 2 APR 2007
- Manuscript Received: 20 FEB 2007
- National Cancer Institute and General Medical Sciences, National Institutes of Health. Grant Numbers: R01 GM068448, R01 CA035675
- Samuel Waxman Cancer Research Foundation
- Chernow Endowment
Retinoic acid inducible gene-I (RIG-I) functions as the first line of defense against viral infection by sensing dsRNA and inducing type I interferon (IFN) production. The expression of RIG-I itself is induced by IFN-α/β and dsRNA. To comprehend the molecular mechanism of expression regulation, we cloned the RIG-I promoter and analyzed its activity upon IFN-β and dsRNA treatment. Under basal condition, RIG-I mRNA level and promoter activity were significantly higher in normal cells versus their tumor counterparts. In both normal and cancer cells, RIG-I expression was induced by IFN-β and dsRNA. A single IRF-1 binding site in the proximal promoter functioned as a crucial regulator of basal, IFN-β- and dsRNA-mediated induction of the RIG-I promoter. IFN-β and dsRNA treatment increased IRF-1 binding to the RIG-I promoter. IRF-1 expression was also higher in normal cells than in cancer cells and it was induced by IFN-β with similar kinetics as RIG-I. These results confirm that by controlling RIG-I expression, IRF-1 plays an essential role in anti-viral immunity. IRF-1 is a tumor suppressor and the expression profile of RIG-I together with its regulation by IRF-1 and the presence of a caspase-recruitment domain in RIG-I suggest that RIG-I might also possess tumor suppressor properties. J. Cell. Physiol. 213: 502–510, 2007. © 2007 Wiley-Liss, Inc.