Cellular immunity effect of leukemia vaccine on tumor burden rat

Objective: To evaluate the effect of the active specific immunotherapy with leukemia vaccine in the malignant hematopoietic diseases. Methods: We established the animal models by inoculating C₅₇BL/6 rats with FBL-3 erythroleukemia cells and prepared three types of tumor vaccine, which were administered on the rats respectively. The MTT colorimetric assay was adopted 2 and 4 weeks later to test the cytotoxicity of macrophage (M_Φ) and that of cytotoxic T lymphocyte(CTL) derived from the rats injected with tumor vaccines, and compared the results with the control group. Results: With the growth of erythroleulemia cells in the rats, the cellular immunity was seriously depressed, and the inhibition of specific cellular immunity was later than that of non-specific cellular immunity. The tumor vaccine made from inactivated tumor cells, IFA and cytokines (rGM-CSF, rIL-2 and rIL-6), promote the cellular immunity of tumor burden rats, especially the specific cellular immunity more efficiently than that of tumor vaccine made from inactivated tumor cells and IFA, but the third vaccine made from inactivated tumor cells alone has no effect. Conclusion: The tumor vaccine made from inactivated tumor cells with addition of IFA and cytokines (rGM-CSF, rIL-2 and rIL-6) provides a promising future in the active specific immunotherapy against hematopoietic tumor.