Objective: To develop a novel protein-anchor technology to immobilize human interleukin-2 on tumor cells to induce antitumor immunity.
Methods: Interleukin-2 surface-modified MB49 cells were prepared as a vaccine. Subcutaneous and pulmonary metastatic mouse models of MB49 bladder cancer were used to evaluate the antitumor efficiency of the vaccine. Immunohistochemistry, flow cytometric, and cytotoxic T-lymphocyte assay were performed to assess the proportion and cytotoxicity of the T lymphocytes.
Results: The IL-2 surface-modified MB49 cell vaccine inhibited tumor growth and extended the survival of the mice, and the vaccine-cured mice effectively resisted the second MB49 but not the RM-1 prostate cancer cell challenge. Furthermore, more cytotoxicity on the MB49 cells and more CD4-positive, CD8-positive T cells appeared in the vaccine-treated group.
Conclusion: The results of our study have demonstrated that the human interleukin-2 surface-modified MB49 bladder cancer cell vaccine induced specific antitumor immunity and was efficient against metastatic bladder cancer.
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