Neoplasma Vol.50, p.345-349, 2003
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Title: Low antigen-dependent activity of T cells after repeated stimulation using dendritic cells and expansion with interleukin-2
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Author: T., BUCHLER
; R., HAJEK
; L., KOVAROVA
; R., MUSILOVA
; L., BOURKOVA
; Z., CECH
; P., VANOVA
; E., TUZOVA
; P., VIDLAKOVA
; J., VORLICEK
; M., PENKA
; |
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Abstract: Both CD8+ and CD4+ T cells with specific activity against tumor antigens are needed for an efficient antitumor immune response. Activation and proliferation of T cells require cellular interactions including adhesion, recognition of peptides presented by MHC molecules to the T cells receptor, and costimulation. In a series of experiments we attempted to generate and expand specific T cells by repeated stimulation using antigen-loaded autologous dendritic cells (DCs). DCs were obtained from peripheral blood mononuclear cells (PBMC) in the presence of IL-4 and GM-CSF. TNF-a was added to induce maturation. A conjugate of myeloma idiotypic protein with keyhole limpet hemocyanin was used as antigen. Nonadherent peripheral blood mononuclear cells were cultured in the presence of Il-2 and IL-7. Autologous DCs were added to the lymphocyte cultures on days 3, 10, and 17. The lymphocytes were stimulated by high concentration of IL-2 between days 21 and 27. Lymphocytes harvested on day 27 proliferated in response to antigen-loaded DC but failed to do so if less than 0.3 x 10(6) DCs were added for stimulation during culture. However, no cytotoxic activity against autologous DCs was detected and IFN-g production in the T cell cultures was low at the end of culture. In conclusion, the generation and expansion of T cells using repeated stimulation by autologous DCs is feasible but defective cytotoxic response of these cells occurs, possibly as a consequence of repeated frequent exposure to antigen
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Year: 2003, Volume: 50, Issue: |
Page From: 345, Page To: 349 |
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