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The bone marrow plays a unique role within the immune system. We compared the phenotype and function of virus-specific CD8(+) T cells from matched samples of human peripheral blood and bone marrow. Analysis of virus-specific memory CD8(+) T cells showed widely divergent partition of antigen-specific populations between blood and bone marrow. T cells specific for Epstein-Barr virus (EBV) lytic antigens were enriched 3-fold in marrow compared with blood, whereas the response to EBV latent epitopes was equivalent between the 2 compartments. No difference in EBV viral load or expression of the EBV lytic protein was observed between blood and bone marrow. In direct contrast, although cytomegalo-virus (CMV)-specific T cells were the largest virus-specific population within peripheral blood, they were reduced by 60% within marrow. Bone marrow T cells were found to exhibit a unique CCR5(+)CXCR6(+)CXCR3(-) homing phenotype which has not been observed on T cells from other secondary lymphoid organs or peripheral organs. Expression of CCR5 and CXCR6 was higher on EBV-specific T cells within peripheral blood compared with CMV-specific populations. These observations identify a novel bone marrow homing phenotype for CD8(+) memory T cells, which necessitates a reevaluation of the magnitude of antigen-specific populations within the lymphoid system.

Original publication

DOI

10.1182/blood-2008-02-138040

Type

Journal article

Journal

Blood

Publication Date

15/10/2008

Volume

112

Pages

3293 - 3302

Keywords

Bone Marrow, CD8-Positive T-Lymphocytes, Cell Movement, Chemokines, Cytokines, Flow Cytometry, Herpesvirus 4, Human, Humans, Immunologic Memory, Interferon-gamma, Models, Biological, Phenotype, Receptors, CCR5, Receptors, CXCR6, Receptors, Chemokine, Receptors, Virus, Viral Load