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- W2029565478 abstract "MUC1 is highly expressed in adenocarcinomas and is a possible target for immunotherapy. In mice, oxidized mannan linked to MUC1 (M-FP), given in vivo, induces potent MHC-restricted CTL and tumor protection. Because of the resistance of cancer patients to immunization, ex vivo immunization of macrophage/dendritic cells was examined using oxidized mannan MUC1 to target the mannose receptor and the MHC Class I antigen presentation pathway. Here, we show that murine mannose receptor (MR) bearing macrophages derived from peritoneal exudate cells (PEC) and cultured ex vivo with M-FP can, after adoptive transfer, efficiently present MUC1 to T cells, leading to the generation of high frequency of CTL and protection from tumor challenge. Mice immunized once with syngeneic PEC pulsed with M-FP elicit a similar CTLp frequency to that obtained with three in vivo immunizations. Targeting the MR is crucial to obtain high frequency CTL, and without oxidiation the CTLp frequency was low. GM-CSF is important, as GM-CSF o/o mice gave reduced responses, a deficiency corrected by in vivo GM-CSF. In addition, the treatment of macrophages ex vivo with GM-CSF gave enhanced responses and treating mice with GM-CSF prior to M-FP immunizations also enhanced cellular responses. M-FP targets the MR and ensures rapid passage of peptides to Class I molecules, and can also directly stimulate in vitro IL-12 production by macrophages. While many studies are now focussing on dendritic cells, in this study the cells involved were adherent F4/80+ 33D1− macrophages. The findings could be of benefit for the immunization of patients with cancer." @default.
- W2029565478 created "2016-06-24" @default.
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- W2029565478 date "2000-07-01" @default.
- W2029565478 modified "2023-10-03" @default.
- W2029565478 title "Ex vivo targeting of the macrophage mannose receptor generates anti-tumor CTL responses" @default.
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- W2029565478 doi "https://doi.org/10.1016/s0264-410x(00)00090-6" @default.
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