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Journal of Virology, December 2004, p. 13470-13478, Vol. 78, No. 24
0022-538X/04/$08.00+0     DOI: 10.1128/JVI.78.24.13470-13478.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.

Induction of Id1 and Id3 by Latent Membrane Protein 1 of Epstein-Barr Virus and Regulation of p27/Kip and Cyclin-Dependent Kinase 2 in Rodent Fibroblast Transformation

David N. Everly Jr., Bernardo A. Mainou, and Nancy Raab-Traub*

Lineberger Comprehensive Cancer Center, School of Medicine, University of North Carolina, Chapel Hill, North Carolina

Received 14 June 2004/ Accepted 2 August 2004

Latent membrane protein 1 (LMP1), the Epstein-Barr virus oncoprotein, activates NF-{kappa}B, phosphatidylinositol 3-kinase, mitogen-activated protein kinase, and c-Jun N-terminal kinase signaling. To determine global transcriptional changes induced by LMP1 in epithelial cells, genomic analysis of C33A cells stably expressing LMP1 was performed. Relatively few genes were induced by LMP1. Expression of two members of the Id (inhibitor of differentiation) family of proteins, Id1 and Id3, was induced in the presence of LMP1 and confirmed by mRNA and protein in C33A and Rat-1 cells. In Rat-1 foci transformed by LMP1, Id1 protein was also increased. Id proteins are known negative regulators of E-box proteins that positively regulate p16 and potentially other cyclin-dependent kinase inhibitors (cdki's). In LMP1-expressing Rat-1 cells, cdki p27 was specifically downregulated. Decreased p27 was correlated with increased levels of Cdk2 and increased levels of phosphorylated retinoblastoma protein. This study describes new properties of LMP1 that likely contribute to transformation and oncogenesis.

* Corresponding author. Mailing address: Lineberger Comprehensive Cancer Center, University of North Carolina-Chapel Hill, Mason Farm Rd., Room 102, Chapel Hill, NC 27599. Phone: (919) 966-1701. Fax: (919) 966-9673. E-mail: nrt{at}med.unc.edu.

Journal of Virology, December 2004, p. 13470-13478, Vol. 78, No. 24
0022-538X/04/$08.00+0     DOI: 10.1128/JVI.78.24.13470-13478.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.



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