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CD4+ T-cell responses to Epstein-Barr virus (EBV) latent-cycle antigens and the recognition of EBV-transformed lymphoblastoid cell lines

Long, H. M. and Haigh, T. A. and Gudgeon, N. H. and Leen, A. M. and Tsang, C.-W. and Brooks, J. and Landais, E. and Houssaint, E. and Lee, S. P. and Rickinson, A. B. and Taylor, G. S. (2005) CD4+ T-cell responses to Epstein-Barr virus (EBV) latent-cycle antigens and the recognition of EBV-transformed lymphoblastoid cell lines. Journal of Virology, 79 (8). pp. 4896-4907. ISSN 0022-538X

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URL of Published Version: http://dx.doi.org/10.1128/​JVI.79.8.4896-4907.2005

Identification Number/DOI: 10.1128/​JVI.79.8.4896-4907.2005

There is considerable interest in the potential of Epstein-Barr virus (EBV) latent antigen-specific CD4\(^+\) T cells to act as direct effectors controlling EBV-induced B lymphoproliferations. Such activity would require direct CD4\(^+\) T-cell recognition of latently infected cells through epitopes derived from endogenously expressed viral proteins and presented on the target cell surface in association with HLA class II molecules. It is therefore important to know how often these conditions are met. Here we provide CD4\(^+\) epitope maps for four EBV nuclear antigens, EBNA1, -2, -3A, and -3C, and establish CD4\(^+\) T-cell clones against 12 representative epitopes. For each epitope we identify the relevant HLA class II restricting allele and determine the efficiency with which epitope-specific effectors recognize the autologous EBV-transformed B-lymphoblastoid cell line (LCL). The level of recognition measured by gamma interferon release was consistent among clones to the same epitope but varied between epitopes, with values ranging from 0 to 35% of the maximum seen against the epitope peptide-loaded LCL. These epitope-specific differences, also apparent in short-term cytotoxicity and longer-term outgrowth assays on LCL targets, did not relate to the identity of the source antigen and could not be explained by the different functional avidities of the CD4\(^+\) clones; rather, they appeared to reflect different levels of epitope display at the LCL surface. Thus, while CD4\(^+\) T-cell responses are detectable against many epitopes in EBV latent proteins, only a minority of these responses are likely to have therapeutic potential as effectors directly recognizing latently infected target cells.

Type of Work:Article
Date:April 2005 (Publication)
School/Faculty:Colleges (2008 onwards) > College of Medical & Dental Sciences
Department:CRUK Institute for Cancer Studies
Subjects:RC0254 Neoplasms. Tumors. Oncology (including Cancer)
Institution:University of Birmingham
Copyright Holders:American Society for Microbiology
ID Code:1140
Refereed:YES
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