Detection of CD8+ T Cells Sensitized to BK Virus Large T Antigen in Healthy Volunteers and Kidney Transplant Recipients
- 31 May 2006
- journal article
- research article
- Published by Elsevier BV in Human Immunology
- Vol. 67 (4-5), 298-302
- https://doi.org/10.1016/j.humimm.2006.02.031
Abstract
BK virus (BKV) infections after renal transplantation are increasingly recognized. Development of immune monitoring strategies against BKV requires definition of antigenic epitopes. Hence, T cells from HLA-A02-positive healthy subjects and kidney transplant recipients were stimulated by BKV lysate pulsed on mature autologous dendritic cells and screened against four different T antigen peptides or against BKV lysate. IFN-γ production was measured by ELISPOT assays. The peptide BKV362–371 (MLTERFNHIL) was naturally processed and recognized by five of six healthy subjects (39 ± 11 IFN-γ spots/100,000 cells) and five of seven kidney transplant recipients (21 ± 12 IFN-γ spots). Less frequent and weaker CD8+ T-cell responses were detected against three other peptides. Thus, BKV large T antigen is a target for CD8+ T-cell immunity. T-antigen-specific T-cytotoxic cells circulate in healthy blood donors, implying that transient expression of T antigen presumably occurs at sites of viral latency and helps maintain a constant pool of circulating CD8+ T memory cells.Keywords
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