Experimental study on ovarian cancer immunotherapy by EpCAM activated dendritic cells induce antigen-specific CD8+ cytotoxic T lymphocytes / 中国免疫学杂志

ABSTRACT

Objective:To observe the effect on ovarian cancer immunotherapy by dendritic cells (DC) which activated by Epithelial cell adhesion molecule (EpCAM) induce antigen-specific CD8+ cytotoxic T lymphocytes (CTL) and to provide some help to ovarian cancer immunotherapy.Methods: Interleukin (IL)-12,and IL-10 of DC were tested after inducing by EpCAM.Subsequently,EpCAM specific CTL CD8+ was induced by EpCAM-DC.The therapeutic effect and interferon (IFN)-γ of EpCAM-DC-CD8+ CTL on normal ovarian epithelial cells IOSE80 and ovarian cancer cell SKVO3 was detected.After treatment of EpCAM-DC-CD8+ CTL,the volume of ovarian tumor of bearing BALB/c-nu/nu mice was detected.Meanwhile,the morphology changes of tumor tissue were observed by HE staining.Results: Compared with PBS,EpCAM stimulation significantly inceased surface markers DC80,DC83,DC86 and HLA-DR levels,and added up to 4.79,4.85,4.60 and 10.91 times (P0.05).However,the killing rate of EpCAM-DC-CD8+ CTL on SKVO3 cells was 6.82-folds as much as that of DC-CD8+ CTL.Animal experiments showed that ovarian cancer transplantation tumor volume ratio after EpCAM-DC-CD8+ CTL treatment,was significantly lower than PBS group and DC-CD8+ CTL group,which reached 0.27 and 0.28 times,respectively (P<0.05).HE staining showed that EpCAM-DC-CD8+ CTL treatment resulted in significant changes of tumor tissues in pathology.Conclusion: EpCAM protein stimulated the maturation of DC that induced the production of EpCAM specific CD8+ CTL.EpCAM-DC-CD8+ CTL can effectively kill ovarian tumor cells and delay the growth of tumor,which is of great significance for the immunotherapy of ovarian cancer.