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- W2514713598 abstract "Fibroblast activation protein α (FAPα) is expressed in cancer-associated fibroblasts (CAFs), which are the main type of cells in the tumor microenvironment. CAFs exert immunosuppressive activity, which can weaken the effects of cancer immunotherapy and mainly account for poor outcomes with therapeutic vaccines. To better target and destroy CAFs, a FAPα vaccine using a modified vaccinia ankara (MVA) vector was constructed and used with a DNA vaccine reported in our previous work for heterologous prime-boost immunizations in mice. This strategy to generate anti-tumor immunity partly reduced 4T1 tumor growth through producing FAPα-specific cytotoxic T lymphocyte responses in a preventive model, but the effect required improvement. Combining the FAPα-based cancer vaccines (CpVR-FAP/MVA-FAP) with cyclophosphamide (CY), which can be used not only as a chemotherapeutic but also an immunomodulatory agent to promote a shift from immunosuppression to immunopotentiation, resulted in markedly enhanced tumor growth inhibition compared with the CpVR-FAP/MVA-FAP group. This strategy achieved synergistic effects in a therapeutic model by improving the tumor inhibition rate by 2.5-fold (90.2%), significantly enhancing cellular immunity and prolonging the survival of 4T1 tumor-bearing mice by 35% compared with the PBS group. Furthermore, CAFs, stromal factors and immunosuppressive factors such as IL-10 and Tregs were also markedly decreased by the CY combination. These results indicated that FAPα-targeted MVA boosting in combination with CY is an effective approach to improving specific anti-tumor immune responses through overcoming immunosuppression. This study may offer important advances in research on clinical cancer immunotherapies by modulating immunosuppressive factors." @default.
- W2514713598 created "2016-09-16" @default.
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- W2514713598 date "2016-12-01" @default.
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- W2514713598 title "Improvement of anti-tumor immunity of fibroblast activation protein α based vaccines by combination with cyclophosphamide in a murine model of breast cancer" @default.
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- W2514713598 doi "https://doi.org/10.1016/j.cellimm.2016.08.006" @default.
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