A simple in vitro method for evaluating dendritic cell-based vaccinations

Pham, Phuc Van, Nguyen, Nhung Thi, Nguyen, Hoang Minh, Khuat, Lam Tan, Le, Phong Minh, Pham, Viet Quoc, Nguyen, Sinh Truong and Phan, Ngoc Kim (2014) A simple in vitro method for evaluating dendritic cell-based vaccinations. OncoTargets and Therapy, 7, 1455-64. (doi:10.2147/OTT.S67057).

Abstract

BACKGROUND: Dendritic cell (DC) therapy is a promising therapy for cancer-targeting treatments. Recently, DCs have been used for treatment of some cancers. We aimed to develop an in vitro assay to evaluate DC therapy in cancer treatment using a breast cancer model.

METHODS: DCs were induced from murine bone marrow mononuclear cells in Roswell Park Memorial Institute (RPMI) 1640 medium supplemented with GM-CSF (20 ng/mL) and IL-4 (20 ng/mL). Immature DCs were primed with breast cancer stem cell (BCSC)-derived antigens. BCSCs were sorted from 4T1 cell lines based on aldehyde dehydrogenase expression. A mixture of DCs and cytotoxic T lymphocytes (CTLs) were used to evaluate the inhibitory effect of antigen-primed DCs on BCSCs. BCSC proliferation and doubling time were recorded based on impedance-based cell analysis using the xCELLigence system. The specification of inhibitory effects of DCs and CTLs was also evaluated using the same system.

RESULTS: The results showed that impedance-based analysis of BCSCs reflected cytotoxicity and inhibitory effects of DCs and CTLs at 72 hours. Differences in ratios of DC:CTL changed the cytotoxicity of DCs and CTLs.

CONCLUSION: This study successfully used impedance-based cell analysis as a new in vitro assay to evaluate DC efficacy in cancer immunotherapy. We hope this technique will contribute to the development and improvement of immunotherapies in the near future.

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Contributors

Author: Lam Tan Khuat

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