Published ahead of print on October 6, 2005, doi:10.1165/rcmb.2004-0417OC
Am. J. Respir. Cell Mol. Biol., Volume 34, Number 2, February 2006, 192-203
A more recent version of this article appeared on February 1, 2006
Submitted on December 28, 2004
Revised on September 26, 2005
Rhinovirus Induces Airway Epithelial Gene Expression through dsRNA and Interferon-dependent Pathways
Yin Chen1*, Edward Hamati1, Pak-Kei Lee1, Wai-Ming Lee2, Shinichiro Wachi1, David Schnurr3, Shigeo Yagi3, Gregory Dolganov4, Homer Boushey4, Pedro Avila4, and Reen Wu1
1 Department of Internal Medicine, University of California at Davis, Davis, CA, USA,
2 Department of Pediatrics, University of Wisconsin, Madison, WI, USA,
3 California Department of Health Services, Richmond, Richmond, CA, USA,
4 Department of Medicine, University of California at San Francisco, San Francisco, CA, USA
* To whom correspondence should be addressed. E-mail: yinchen{at}ucdavis.edu.
Rhinovirus (RV) infection is the major cause of common colds and of asthma exacerbations. Because epithelial cell layer is the primary target of RV infection, we hypothesize that RV-induced airway diseases is associated with the perturbation of the airway epithelial gene expression. In this study, well-differentiated primary human airway epithelial cells were infected with either RV16 (major group) or RV1B (minor group). Transcriptional gene profiles from RV-infected and mock-infected control cells were analyzed by Affymetrix GenechipTM, and changes of the gene expression were confirmed by real-time RT-PCR analysis. Twenty-four hours after infection, 48 genes induced by both viruses were identified. Most of these genes are related to the interferon pathway and have been documented to have anti-viral functions. Indeed, a significant stimulation of IFN secretion was detected after RV16 infection. Neutralizing antibody specific to IFN and a specific inhibitor of JAK pathway both significantly blocked the induction of RV inducible genes. Further studies demonstrated that 2-aminopurine, a specific inhibitor double-stranded RNA (dsRNA)-dependent protein kinase (PKR) could block both IFN production and RV-induced gene expression. Thus, IFN dependent pathway is a part of the dsRNA-initiated pathway that is responsible for RV-induced gene expression. Consistent with its indispensable role in the induction of antiviral genes, deactivation of this signaling pathway significantly enhanced viral production. Because increase of viral yield is associated with the severity of RV-induced airway illness, the discovery of epithelial antiviral signaling pathway in this study will contribute to our understanding of the pathogenesis of RV-induced colds and asthma exacerbations.
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Copyright © 2005 American Thoracic Society.
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