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In order to establish the method of generating powerful gammadelta T cells for anti-tumor immunotherapy, we investigated the effects of monocyte-derived dendritic cells (mo-DCs) on anti-tumor cytotoxicity of expanded gammadelta T cells. Activation of gammadelta T cells co-cultured for 2-3 days with immature or mature mo-DCs was evaluated by CD69 expression and anti-tumor cytotoxicity using two assays : the 5- (and 6-) carboxyfluorescein diacetate, succinimidyl ester-based cytotoxicity assay and the calcein-AM-based Terascan assay. gammadelta T cells were used as effector cells and myeloma cell line (RPMI8226) or chronic myelogenous leukemia blastic crisis cell line (C2F8) were used as target cells. CD69 expression on gammadelta T cells was enhanced by co-culture with both immature and mature mo-DCs in a cell-number-dependent fashion. CD69 expression was enhanced after addition of mo-DCs of either autologous or allogeneic origin. Activation of gammadelta T cells with mo-DCs enhanced anti-tumor cytotoxicity of gammadelta T cells against RPMI8226 and C2F8 in an effector-to-target ratio-dependent manner. Activation of gammadelta T cells by mo-DCs was associated with the enhancement of anti-tumor cytotoxicity of gammadelta T cells. Potent gammadelta T cells activated by mo-DCs were considered to be applicable to an efficient gammadelta T cell-mediated immunotherapy for tumors.

Enhancement of Anti-tumor Cytotoxicity of Expanded .GAMMA..DELTA. T Cells by Stimulation with Monocyte-derived Dendritic Cells