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- W2000672322 abstract "Repeated subcutaneous (s.c.) injections of recombinant granulocyte-macrophage colony-stimulating factor (recGM-CSF) for 4-5 days can enrich an immunization site with antigen-presenting cells (APC), which has been correlated with improved immune responses in experimental and clinical studies. A recombinant vaccinia virus encoding the GM-CSF gene (rV-GM-CSF) has been developed and can generate specific antitumour immunity in a whole tumour cell vaccine. In the present study, we examined whether rV-GM-CSF could produce and release GM-CSF locally which, in turn, might enrich a site of immunization for APC as previously shown for recGM-CSF. S.c. injection of rV-GM-CSF significantly (P<0.05) enhanced the percentage and overall number of APC, measured by class II expression levels, in the regional lymph nodes that drain the injection site. Dose- and temporal-dependent studies showed class II expression levels in the draining lymph nodes were maximally enhanced 5-7 days after a single injection of 10(7)plaque-forming units (pfu) of rV-GM-CSF. Flow cytometry revealed that the increase in class II expression resulted from (i) a higher class II expression level on CD19(+)B cells and (ii) an increase in the number of CD11c(+)/class II(+)professional APC within the draining lymph nodes. Moreover, isolation of lymph nodes from rV-GM-CSF-treated mice revealed their capacity to support higher levels of antigen-specific T cell proliferation and allospecific cytotoxic responses. A comparison between a single injection of rV-GM-CSF and a 4-day course of recGM-CSF revealed comparable changes in class II expression and functional T cell assays. GM-CSF can be delivered in a recombinant poxvirus, and the local production of the cytokine results in cellular and phenotypic changes that are similar to those of recGM-CSF. The ability to utilize rV-GM-CSF as a single inoculum may be more compatible with traditional immunization strategies." @default.
- W2000672322 created "2016-06-24" @default.
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- W2000672322 date "2000-07-01" @default.
- W2000672322 modified "2023-09-23" @default.
- W2000672322 title "COMPARATIVE STUDIES OF THE EFFECTS OF RECOMBINANT GM-CSF AND GM-CSF ADMINISTERED VIA A POXVIRUS TO ENHANCE THE CONCENTRATION OF ANTIGEN- PRESENTING CELLS IN REGIONAL LYMPH NODES" @default.
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- W2000672322 doi "https://doi.org/10.1006/cyto.2000.0684" @default.
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