Figure 2. VLPV-PSA vaccine induces dose-dependent PSA-specific immune response in DR2bxPSA F1 mice.
Mice were immunized i.m. twice with VLPV-PSA at indicated doses. Cellular immune responses to PSA were measured in the spleens (A) and inguinal LN (B) two weeks after boost immunization using IFNγ ELISPOT assay. Lymphocytes (2×105 per well) were stimulated with either H-2Db restricted peptide PSA65–73 or TRAMP-PSA tumor targets. Irrelevant peptide Neo49–59, parental TRAMP-C1 tumor cells or media (No Ag) were used as negative controls. Target tumor cells were pre-treated with IFNγ and irradiated at 10,000 rad. The data for the pool of 3 mice per group are shown (mean ± SD of triplicates). TNTC: too numerous to count.