ABSTRACT
OBJECTIVE: To investigate the therapeutic effect of sequential intratumoral injection of xenogeneic antigens in immunized tumor-bearing mice. METHODS: Sequential intratumoral injection of the xenoantigens was performed in immunized mice bearing S180 tumor. The tumor size changes were observed, and the tumor-infiltrating lymphocytes (TIL) including CD3+CD4+T, CD3+CD8+T, and CD3+CD4+CD25+T lymphocytes were counted with flow cytometry. The concentrations of IL-2 and TNF-alpha in the tumor was measured using ELISA. RESULTS: No significant difference was found in the number of CD3+T lymphocytes in the TILs between different groups. After the immunotherapy, the percentages of CD3+CD4+T, CD3+CD8+T and CD3+CD4+CD25+T lymphocytes were 54%, 22% and 2.91%, respectively, with the CD4+/CD8+ ratio of 2.49, significantly different from that in the control group (P<0.05). The concentrations of IL-2 and TNF-alpha were 100.61 pg/ml and 54.114 pg/ml, respectively, significantly different from those in the control group (P<0.05). CONCLUSION: Sequential intratumoral injection of heteragenetic antigena can significantly increase the amount of effector cells and cytokines in the micro-environment of the tumor, and decrease the expression of T regulatory.
