Research Article

Fas Ligand DNA Enhances a Vaccination Effect by Coadministered DNA Encoding a Tumor Antigen through Augmenting Production of Antibody against the Tumor Antigen

Figure 2

Antitumor effects produced by DNA immunization. BALB/c mice ( or 7) were treated with cardiotoxin and 5 days later with DNA (50 μg for each), pcDNA3 + pCAGGS, pcDNA3 + pCAGGS/FasL (FasL), pcDNA3/β-gal (β-gal) + pCAGGS, or pcDNA3/β-gal + pCAGGS/FasL (β-gal + FasL). The mice were then inoculated with Colon 26/β-gal cells (1 × 106) 21 days after DNA injections. The tumor growth of mice injected with cDNA3/β-gal + pCAGGS/FasL was significantly retarded 21 days after the tumor inoculation compared with that of mice inoculated with pcDNA3 + pCAGGS, pcDNA3 + pCAGGS/FasL, or pcDNA3/β-gal + pCAGGS. .