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Molecular and Cellular Biology, July 2005, p. 6247-6258, Vol. 25, No. 14
0270-7306/05/$08.00+0     doi:10.1128/MCB.25.14.6247-6258.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.

Gamma Interferon-Inducible Protein 10 Induces HeLa Cell Apoptosis through a p53-Dependent Pathway Initiated by Suppression of Human Papillomavirus Type 18 E6 and E7 Expression

Huifang M. Zhang, Ji Yuan, Paul Cheung, David Chau, Brian W. Wong, Bruce M. McManus, and Decheng Yang*

Department of Pathology and Laboratory Medicine, University of British Columbia-The James Hogg iCAPTURE Centre, St. Paul's Hospital, Vancouver, Canada

Received 13 October 2004/ Returned for modification 2 December 2004/ Accepted 21 April 2005

Gamma interferon-inducible protein 10 (IP10) is a member of the CXC family of chemokines. By differential mRNA display, we have demonstrated the upregulation of IP10 in coxsackievirus B3 (CVB3)-infected mouse hearts. Functional characterization of the IP10 gene in IP10-transfected Tet-On HeLa cells has found that IP10 induced cell apoptosis and inhibited viral replication. In the characterization of the IP10-induced apoptotic pathway, we found that overexpression of IP10 upregulated p53 and resulted in altered expression of p53-responsive genes such as the p21Cip1, p27kip1, NF-{kappa}B, Bax, and PUMA genes and the mitochondrial translocation of Bax. However, transduction of the IP10 cells with adenovirus expressing dominant negative p53 not only ablated p53-triggered gene expression but also abolished IP10-induced apoptosis and restored CVB3 replication to the control levels. These data suggest a novel mechanism by which IP10 inhibits viral replication through the induction of host cell death via a p53-mediated apoptotic pathway. We also found that constantly high-level expression of p53 in these tumor cells is attributed to the IP10-induced suppression of human papillomavirus E6 and E7 oncogene expression. Taken together, these data reveal not only a previously unrecognized link between chemokine IP10 and p53 in antiviral defense but also a mechanism by which IP10 inhibits tumor cell growth.

* Corresponding author. Mailing address: The James Hogg iCAPTURE Centre, University of British Columbia, St. Paul's Hospital, 1081 Burrard Street, Vancouver, B.C., Canada V6Z 1Y6. Phone: (604) 682-2344, ext. 62872. Fax: (604) 806-9274. E-mail: dyang{at}mrl.ubc.ca.

Molecular and Cellular Biology, July 2005, p. 6247-6258, Vol. 25, No. 14
0022-538X/05/$08.00+0     doi:10.1128/MCB.25.14.6247-6258.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.



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