Effect of tumor antigen and lymph node egress in the migration of adoptively transferred antigen-specific CD8+ T cells.
Adoptive transfer experiment was carried as indicated in the schematic diagram in Fig. 6A. CFSE-labeled, 1.5×106 OVA257–264-specific CD8+ T cells (obtained from in-vitro expanded cultures) were transferred intravenously into day 9 tumor bearing mice (mean tumor size 45–90 mm2). Mice were euthanized 4 days later and the number of donor cells in the various organs of recipients was enumerated. (A), Mean ± SD (n = 3–5/group) of OVA257–264-specific CD8+ T cells (of WT or FtDKO origin) recovered from the tumor tissue of WT hosts bearing B16-OVA or B16 tumors respectively is indicated. *, WT cells in B16-OVA compared to B16 tumor tissue, p<0.05. *, WT cells versus FtDKO cells in B16-OVA tumor tissue, p<0.05. (B), Representative flow cytometric profile of tumor-infiltrating CD8+ T cells demonstrating CFSE dilution in WT hosts bearing B16-OVA tumors. (C), Mean ± SD (n = 3–4/group) of OVA257–264-specific CD8+ T cells (of WT or FtDKO origin) recovered from the tumor tissue of WT hosts that are untreated on treated with FTY720. *, WT cells in WT hosts compared to WT cells in WT-FTY720 treated hosts, p<0.05.