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http://dx.doi.org/10.15324/kjcls.2022.54.1.38

Synergistic Anti-Tumor Effect by the Combination of Cyclophosphamide and Dendritic Cell Vaccination in Murine Tumor Model that CEA Expressing  

Park, Mi-Young (Department of Clinical Laboratory Science, Suwon Science College)
Publication Information
Korean Journal of Clinical Laboratory Science / v.54, no.1, 2022 , pp. 38-48 More about this Journal
Abstract
Carcinoembryonic antigen (CEA) is an oncofetal antigen primarily detected in the peripheral blood of cancer patients, particularly in those with colorectal cancer. CEA is considered a valuable target for antigen-specific immunotherapy. In this study, we induced the anti-tumor immunity for CEA through the administration of a dendritic cell (DC) vaccine. However, there was a limitation in inducing tumor regression in the DC vaccinated mice. To enhance the efficacy of anti-tumor immunity in MC38/CEA2 tumor-bearing mice, we evaluated the effects of DC vaccine in combination with cyclophosphamide (CYP). Administration of CYP 100 mg/kg in mice resulted in significant inhibition of tumor growth in the 2-day tumor model, whereas a lower inhibition of tumor growth was seen in the 10-day tumor model. Therefore, the 10-day tumor model was selected for testing chemo-immunotherapy. The combined CYP and DC vaccine not only increased tumor antigen-specific immune responses but also induced synergistic anti-tumor immunity. Furthermore, the adverse effects of CYP such as weight loss and immunosuppression by regulatory T cells and myeloid-derived suppressor cells showed a significant reduction in the combined chemo-immunotherapy treatment compared with CYP alone. Our data suggest that chemoimmunotherapy with the DC vaccine may offer a new therapeutic strategy to induce a potent anti-tumor effect and reduce the adverse effects of chemotherapy.
Keywords
Carcinoembryonic antigen; Chemo-immunotherapy; Cyclophosphamide; Dendritic cell vaccine;
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