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Engineered CAR-T cells targeting the non-functional P2X purinoceptor 7 (P2X7) receptor as a novel treatment for ovarian cancer. | LitMetric
Objectives : Recent studies have identified expression of the non-functional P2X7 (nfP2X7) receptor on various malignant cells including ovarian cancer, but not on normal cells, which makes it a promising tumour-associated antigen candidate for chimeric antigen receptor (CAR)-T-cell immunotherapies. In this study, we assessed the cytotoxic effects of nfP2X7-CAR-T cells on ovarian cancer using and models.Methods : We evaluated the effects of nfP2X7-CAR-T cells on ovarian cancer cell lines (SKOV-3, OVCAR3, OVCAR5), normal peritoneal cells (LP-9) and primary serous ovarian cancer cells derived from patient ascites using monolayer and 3D spheroid assays. We also evaluated the effects of nfP2X7-CAR-T cells on patient-derived tissue explants, which recapitulate an intact tumour microenvironment. In addition, we investigated the effect of nfP2X7-CAR-T cells using the OVCAR-3 xenograft model in NOD-scid IL2Rγnull (NSG) mice.Results : Our study found that nfP2X7-CAR-T cells were cytotoxic and significantly inhibited survival of OVCAR3, OVCAR5 and primary serous ovarian cancer cells compared with un-transduced CD3 T cells . However, no significant effects of nfP2X7-CAR-T cells were observed for SKOV3 or normal peritoneal cells (LP-9) cells with low P2X7 receptor expression. Treatment with nfP2X7-CAR-T cells increased apoptosis compared with un-transduced T cells in patient-derived explants and correlated with CD3 positivity. Treatment with nfP2X7-CAR-T cells significantly reduced OVCAR3 tumour burden in mice compared with un-transduced CD3 cells for 7-8 weeks.Conclusion : This study demonstrates that nfP2X7-CAR-T cells have great potential to be developed as a novel immunotherapy for ovarian cancer.
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