title: Repertoire development and the control of cytotoxic/effector function in human gammadelta T cells.
abstract: T cells develop into two major populations distinguished by their T cell receptor (TCR) chains. Cells with the alphabeta TCR generally express CD4 or CD8 lineage markers and mostly fall into helper or cytotoxic/effector subsets. Cells expressing the alternate gammadelta TCR in humans generally do not express lineage markers, do not require MHC for antigen presentation, and recognize nonpeptidic antigens. We are interested in the dominant Vgamma2Vdelta2+ T cell subset in human peripheral blood and the control of effector function in this population. We review the literature on gammadelta T cell generation and repertoire selection, along with recent work on CD56 expression and defining a cytotoxic/effector lineage within the phosphoantigen-reactive Vgamma2Vdelta2 cells. A unique mechanism for MHC-independent repertoire selection is linked to the control of effector function that is vital to the role for gammadelta T cells in tumor surveillance. Better understanding of these mechanisms will improve our ability to exploit this population for tumor immunotherapy.
authors.affiliation: Institute of Human Virology, University of Maryland, School of Medicine, 725 W Lombard Street, Baltimore, MD 21201, USA.
authors.forename: Elizabeth M
authors.initials: EM
authors.lastname: Urban
authors.forename: Andrei I
authors.initials: AI
authors.lastname: Chapoval
authors.forename: C David
authors.initials: CD
authors.lastname: Pauza
mesh_terms: D000818:Animals; D019002:CD56 Antigen / Q000096:biosynthesis; D003602:Cytotoxicity, Immunologic; D006680:HLA Antigens / Q000378:metabolism; D006801:Humans; D007157:Immunologic Surveillance; D007167:Immunotherapy; D038041:Lymphopoiesis; D009369:Neoplasms / Q000276:immunology* / Q000628:therapy; D016692:Receptors, Antigen, T-Cell, gamma-delta / Q000235:genetics / Q000378:metabolism*; D016176:T-Lymphocyte Subsets / Q000276:immunology / Q000378:metabolism* / Q000473:pathology; D013601:T-Lymphocytes / Q000276:immunology / Q000378:metabolism* / Q000473:pathology
chemical_list: D019002:CD56 Antigen; D006680:HLA Antigens; D016692:Receptors, Antigen, T-Cell, gamma-delta
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