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Journal of Virology, April 2003, p. 5000-5007, Vol. 77, No. 8
0022-538X/03/$08.00+0     DOI: 10.1128/JVI.77.8.5000-5007.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

Latent Membrane Protein 1 Inhibits Epstein-Barr Virus Lytic Cycle Induction and Progress via Different Mechanisms

Stuart Prince, Sinead Keating, Ceri Fielding, Paul Brennan, Eike Floettmann, and Martin Rowe*

Section of Infection and Immunity, University of Wales College of Medicine, Cardiff CF14 4XX, United Kingdom

Received 28 September 2002/ Accepted 21 January 2003

Epstein-Barr virus (EBV) is a potent growth-transforming agent of human B cells. It has previously been shown that viral latent membrane protein 1 (LMP1) is essential for EBV-induced transformation of normal B cells and contributes to maintenance of latency in vitro. Using the EBV-positive Burkitt's lymphoma line P3HR1-c16, which lacks LMP1 during latency and which can readily be activated into virus-productive lytic cycle, we found that LMP1 inhibits lytic cycle induction via the transcription factor NF-{kappa}B. In addition, LMP1 inhibits lytic cycle progress via two distinct NF-{kappa}B-independent mechanisms: one involving the cytosolic C-terminal activating regions and the other involving the transmembrane region of LMP1. These findings indicate that in B cells EBV self-limits its lytic cycle via three distinct LMP1-mediated mechanisms.

* Corresponding author. Mailing address: Section of Infection and Immunity, University of Wales College of Medicine, Tenovus Building, Cardiff CF14 4XX, United Kingdom. Phone: 44 (029) 20 742579. Fax: 44 (029) 20743868. E-mail: RoweM{at}cf.ac.uk.

Journal of Virology, April 2003, p. 5000-5007, Vol. 77, No. 8
0022-538X/03/$08.00+0     DOI: 10.1128/JVI.77.8.5000-5007.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.



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