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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
RESEARCH SUPPORT, U.S. GOV'T, P.H.S.
Eliciting T cell immunity against poorly immunogenic tumors by immunization with dendritic cell-tumor fusion vaccines.
Journal of Immunology 1998 November 16
Dendritic cells (DCs) are the most effective APCs and are being studied as natural adjuvants or Ag delivery vehicles to elicit T cell-mediated antitumor immunity. This study examined whether inoculation of DCs fused with poorly immunogenic tumor cells elicited tumor-reactive T cells for adoptive immunotherapy. DCs derived from bone marrow of C57BL/6 (B6) mice were fused with syngeneic B16 melanoma or RMA-S lymphoma cells by polyethylene glycol. The B16/DC and RMA-S/DC fusion hybrids expressed MHC class I, class II Ags, costimulatory molecules, as well as DC-specific and tumor-derived surface markers. The tumor/DC hybrids were capable of processing and presenting tumor-derived Ags, and immunization of B6 mice with irradiated B16/DC or RMA-S/DC vaccine elicited tumor-specific CTL activities. Vaccination of B6 mice with irradiated B16/DC fusion preparations induced partial host protective immunity against B16 tumor challenge. Reduced tumor incidence and prolonged survival time were observed. Adoptive transfer of T cells derived from B16/DC vaccine-primed lymph nodes into B16 tumor-bearing mice greatly reduced the number of established pulmonary metastases with or without in vivo administration of IL-2. Moreover, adoptive transfer of RMA-S/DC vaccine-primed, cultured lymph node T cells eradicated disseminated FBL-3 tumor. The results demonstrate that tumor/DC fusion products are effective cellular vaccines for eliciting T cell-mediated antitumor immunity.
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