Of the analyzed factors, four (G-CSF, IFN-γ, IL-6 and MIP-1β) were upregulated to relatively high levels at VRP doses of 103 IU and above (Fig. 5A). Three other cytokines (GM-CSF, IL-5, and TNF) were upregulated at a similar range of VRP doses, although the absolute
levels of cytokines were lower than those shown in Fig. 5A, and are shown separately for clarity (Fig. 5B). The chemokines MIG and IP-10 were strongly upregulated from undetectable levels to levels above the maximum limits of the assay at all doses of VRP greater than 101 IU, while IL-12p40 was not upregulated at all (data not shown). Because VRP clearly induce rapid inflammation in the click here draining lymph node, we evaluated how the VRP dose affects leukocyte activation and recruitment to the lymph node. It has been previously reported that the cellularity of the draining lymph node dramatically increases after boost with VRP [29]. Here we examined the impact on the lymph node after prime by injection of a range of doses of VRP between 101 and 105 IU into the footpads of mice. Draining popliteal lymph nodes were harvested after 6 or 24 h, and cells were counted and stained with antibodies specific for cell surface markers. Lymph node cellularity was not changed during the first 6 h post-VRP inoculation (data not shown), but after 24 h lymph node cellularity was significantly increased when compared to diluent
alone at VRP doses of 102 IU and above (Fig. 6A). It was previously observed that after boost with VRP there is a disproportionate increase in the number of CD11c+CD11b+ cells in the draining lymph node [29]. Cell press Our data show that this is true after prime as well, and we Selleckchem CT99021 further found that the >80% of these cells express F4/80 in addition to CD11c and CD11b. This population constituted a small percentage of the cells in the lymph node in uninjected mice and was significantly increased 24 h after prime with a VRP dose of 102 IU or greater (Fig. 6D). We also examined CD69, an
early activation marker on leukocytes [30] and [31], which has the function of suppressing egress of activated cells from the lymph node [32]. At 6 h after prime with VRP, CD69 was increased on the total live cell population in mice injected with 103 IU or greater (Fig. 6B), similar to the range of VRP doses that upregulated cytokines after 6 h (Fig. 5). By 24 h, CD69 was upregulated in a dose-responsive manner at all tested VRP doses, and appeared to plateau starting at 104 IU (Fig. 6C). The increase in CD69 was not specific to any particular cell type, as T cells, B cells, DCs, and macrophages were all similarly affected (data not shown). Because the response to VRP may differ somewhat following i.m. injection, we assessed the amount of VRP present in the draining lymph node following footpad or i.m. gastrocnemius injection of VRP-GFP. After 16 h, we harvested various lymph nodes and detected GFP-positive VRP-infected cells by flow cytometry.
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