title: Down-regulation of CXCR4 expression on human CD8+ T cells during peripheral differentiation.
abstract: Multi-color flow cytometric analysis on human CD8(+) T cell subsets revealed that CXCR4 is predominantly expressed on CD8(+) T cells with the naive CD27(+)CD28(+)CD45RA(+) phenotype, and is down-regulated during differentiation into those with an effector phenotype. The down-regulation of CXCR4 expression during peripheral differentiation was supported by the fact that the expression of CXCR4 on CD8(+) T cells was negatively correlated with that of perforin. The analysis of CCR5, CCR7, and CXCR4 co-expression further showed that CD8(+) T cells expressing a high level of CXCR4 are CCR7(+)CCR5(-) naive or central memory subsets, and those expressing a low level of CXCR4 were included in the CCR7(-)CCR5(+/-) memory/effector and effector subsets. Epstein Barr virus-specific CD8(+) T cells, which mostly express the memory phenotype, expressed CXCR4, while human cytomegalovirus-specific CD8(+) T cells, which mostly express the effector phenotype, partially expressed this receptor, showing that the expression of CXCR4 is also down-regulated during differentiation of viral antigen-specific CD8(+) T cells. The classification of human CD8(+) T cells based on the expression of these chemokine receptors should prove useful for studies that clarify the differentiation of human CD8(+) T cells.
authors.affiliation: Division of Viral Immunology, Center for AIDS Research, Kumamoto University, Kumamoto, Japan.
authors.forename: Naoki
authors.initials: N
authors.lastname: Kobayashi
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Takata
authors.forename: Shumpei
authors.initials: S
authors.lastname: Yokota
authors.forename: Masafumi
authors.initials: M
authors.lastname: Takiguchi
mesh_terms: D018414:CD8-Positive T-Lymphocytes / Q000166:cytology / Q000276:immunology* / Q000378:metabolism; D002454:Cell Differentiation / Q000276:immunology*; D015536:Down-Regulation; D006801:Humans; D008562:Membrane Glycoproteins / Q000276:immunology / Q000378:metabolism; D054353:Perforin; D052899:Pore Forming Cytotoxic Proteins; D019713:Receptors, CCR5 / Q000276:immunology / Q000378:metabolism; D054400:Receptors, CCR7; D019718:Receptors, CXCR4 / Q000235:genetics / Q000276:immunology / Q000378:metabolism*; D019707:Receptors, Chemokine / Q000276:immunology / Q000378:metabolism; D023062:Receptors, Interleukin-8A / Q000276:immunology / Q000378:metabolism; D016176:T-Lymphocyte Subsets / Q000166:cytology / Q000276:immunology* / Q000378:metabolism
chemical_list: C515370:CCR7 protein, human; D008562:Membrane Glycoproteins; D052899:Pore Forming Cytotoxic Proteins; D019713:Receptors, CCR5; D054400:Receptors, CCR7; D019718:Receptors, CXCR4; D019707:Receptors, Chemokine; D023062:Receptors, Interleukin-8A; D054353:Perforin