title: Innate anti-breast cancer immunity of apoptosis-resistant human gammadelta-T cells.
abstract: We previously identified a CD2-initiated signaling pathway which inhibits activation-induced cell death in mitogen-stimulated human gammadelta-T cells permitting the large-scale expansion of these cells. Here we report the innate anti-tumor activity of expanded human gammadelta-T cells against human breast cancer cells. Apoptosis-resistant human gammadelta-T cells which were expanded in vitro from cultured human peripheral blood mononuclear cells displayed lytic activity against breast cancer cell lines MDA-MB-231, MCF-7 and T-47D, but failed to kill normal human skin fibroblasts and normal human liver cells. Monoclonal antibodies (mAb) directed against the gammadelta-T cell receptor (TCR) or mAb directed against either the Vgamma9 or the Vdelta2 TCR chains were able to block gammadelta-T cell-mediated lysis of MDA-MB-231 cells. In addition, mAb against intercellular adhesion molecules-1 (ICAM-1/CD54) or CD18 (beta subunit of ICAM-1 counter-receptor) also blocked gammadelta-T cell-mediated killing of MDA-MB-231 cells. Ex vivo expanded human gammadelta-T cells are thus able to innately recognize and kill human breast cancer cells in a gammadelta-TCR-dependent manner; ICAM-1 and CD18 also appear to be involved in the interactions between sensitive breast cancer cells and cytolytic gammadelta-T cells. As apoptosis-resistant human gammadelta-T cells can now readily be expanded to large numbers (clinical scale), these findings must be considered in the context of developing adoptive immunotherapy strategies to exploit gammadelta-T cell innate immune responses for the primary or adjuvant treatment of breast cancer.
authors.affiliation: Bone Marrow Transplantation Program, University of Alabama at Birmingham, Birmingham, AL 35294, USA.
authors.forename: Ben L
authors.initials: BL
authors.lastname: Guo
authors.forename: Zhiyong
authors.initials: Z
authors.lastname: Liu
authors.forename: Wayne A
authors.initials: WA
authors.lastname: Aldrich
authors.forename: Richard D
authors.initials: RD
authors.lastname: Lopez
mesh_terms: D017209:Apoptosis / Q000276:immunology*; D001943:Breast Neoplasms / Q000276:immunology / Q000473:pathology; D045744:Cell Line, Tumor; D003601:Cytotoxicity Tests, Immunologic; D003602:Cytotoxicity, Immunologic / Q000276:immunology; D005260:Female; D006801:Humans; D016692:Receptors, Antigen, T-Cell, gamma-delta / Q000276:immunology*; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D016692:Receptors, Antigen, T-Cell, gamma-delta