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Glioma-specific cytotoxic T cells can be effectively induced by subcutaneous vaccination of irradiated wild-type tumor cells without artificial cytokine production.
International Journal of Oncology 2003 August
Effective induction of systemic antitumor immunity is a crucial step for success of immune gene therapy for intracerebral gliomas. We examined in this study the ability to induce glioma-specific cytotoxic T lymphocytes (CTL) by subcutaneous (s.c.) immunization of irradiated whole-tumor cell vaccine with or without artificial cytokine production, and also examined in vivo efficacy of the induced CTL against a rat brain tumor model with 9L gliosarcoma cells. Murine neuroblastoma C1300 cells transduced with the interleukin-2 (IL-2), IL-4 or granulocyte-macrophage colony-stimulating factor (GM-CSF) gene (C1300/IL-2, C1300/IL-4 or C1300/GM-CSF) were used as cytokine-producers. Glioma-specific CTL activity was equivalently induced in the rats vaccinated s.c. with irradiated 9L, irradiated IL-2-producing 9L cells or the mixed population of irradiated 9L and C1300/IL-2 cells, while the activity was relatively lower in the rats vaccinated with irradiated 9L cells mixed with either C1300/IL-4 or C1300/GM-CSF cells. In the rats immunized s.c. with irradiated 9L cells, intracerebral (i.c.) 9L tumors implanted together with either C1300/IL-2 or C1300/IL-4 were completely rejected. Pre-established brain tumor also could be eliminated by the s.c. immunization of irradiated 9L cells and i.c. transplantation of IL-2-producers. These results suggest that glioma-specific CTLs could be effectively induced by s.c. immunization of irradiated wild-type tumor cells without artificial cytokine production.
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