Distinct memory CD4+ T-cell subsets mediate immune recognition of Epstein Barr virus nuclear antigen 1 in healthy virus carriers
Distinct memory CD4+ T-cell subsets mediate immune recognition of Epstein Barr virus nuclear antigen 1 in healthy virus carriers
复制标题
DOI：
10.1182/blood-2006-05-023663
复制
发表时间：
2007-02-01
期刊：
影响因子：
20.3
通讯作者：
Munz, Christian
中科院分区：
文献类型：
--
作者：
Heller, Kevin N.;Upshaw, Jenica;Munz, Christian
CD4(+) T cells, specific for transforming latent infection with the Epstein Barr virus (EBV), consistently recognize the nuclear antigen 1 of EBV (EBNA1). EBNA1-specific effector CD4(+) T cells are primarily T-helper 1 (TH1) polarized. Here we show that most healthy EBV carriers have such IFN-secreting EBNA1-specific CD4(+) T cells at a frequency of 0.03% of circulating CD4(+) T cells. In addition, healthy carriers have a large pool of CD4(+) T cells that proliferated in response to EBNA1 and consisted of distinct memory-cell subsets. Despite continuous antigen presence due to persistent EBV infection, half of the proliferating EBNA1-specific CD4(+) T cells belonged to the central-memory compartment (T-CM). The remaining EBNA1-specific CD4+ T cells displayed an effector-memory phenotype (T-EM), of which a minority rapidly secreted IFN upon stimulation with EBNA1. Based on chemokine receptor analysis, all EBNA1-specific T-CM CD4(+) T cells were TH1 committed. Our results suggest that protective immune control of chronic infections, like EBV, includes a substantial reservoir of T-CM CD4(+) TH1 precursors, which continuously fuels TH1-polarized effector cells.
