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2016 ; 12
(4
): e1005549
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Early T Cell Recognition of B Cells following Epstein-Barr Virus Infection:
Identifying Potential Targets for Prophylactic Vaccination
#MMPMID27096949
Brooks JM
; Long HM
; Tierney RJ
; Shannon-Lowe C
; Leese AM
; Fitzpatrick M
; Taylor GS
; Rickinson AB
PLoS Pathog
2016[Apr]; 12
(4
): e1005549
PMID27096949
show ga
Epstein-Barr virus, a B-lymphotropic herpesvirus, is the cause of infectious
mononucleosis, has strong aetiologic links with several malignancies and has been
implicated in certain autoimmune diseases. Efforts to develop a prophylactic
vaccine to prevent or reduce EBV-associated disease have, to date, focused on the
induction of neutralising antibody responses. However, such vaccines might be
further improved by inducing T cell responses capable of recognising and killing
recently-infected B cells. In that context, EBNA2, EBNA-LP and BHRF1 are the
first viral antigens expressed during the initial stage of B cell growth
transformation, yet have been poorly characterised as CD8+ T cell targets. Here
we describe CD8+ T cell responses against each of these three "first wave"
proteins, identifying target epitopes and HLA restricting alleles. While EBNA-LP
and BHRF1 each contained one strong CD8 epitope, epitopes within EBNA2 induced
immunodominant responses through several less common HLA class I alleles (e.g.
B*3801 and B*5501), as well as subdominant responses through common class I
alleles (e.g. B7 and C*0304). Importantly, such EBNA2-specific CD8+ T cells
recognised B cells within the first day post-infection, prior to CD8+ T cells
against well-characterised latent target antigens such as EBNA3B or LMP2, and
effectively inhibited outgrowth of EBV-transformed B cell lines. We infer that
"first wave" antigens of the growth-transforming infection, especially EBNA2,
constitute potential CD8+ T cell immunogens for inclusion in prophylactic EBV
vaccine design.