Abstract
This protocol describes how to induce large numbers of tumor-specific cytotoxic T cells (CTLs) in the spleens and lymph nodes of mice receiving dendritic cell (DC) vaccines and how to modulate tumor microenvironments (TMEs) to ensure effective homing of the vaccination-induced CTLs to tumor tissues. We also describe how to evaluate the numbers of tumor-specific CTLs within tumors. The protocol contains detailed information describing how to generate a specialized DC vaccine with augmented ability to induce tumor-specific CTLs. We also describe methods to modulate the production of chemokines in the TME and show how to quantify tumor-specific CTLs in the lymphoid organs and tumor tissues of mice receiving different treatments. The combined experimental procedure, including tumor implantation, DC vaccine generation, chemokine-modulating (CKM) approaches, and the analyses of tumor-specific systemic and intratumoral immunity is performed over 30–40 d. The presented ELISpot-based ex vivo CTL assay takes 6 h to set up and 5 h to develop. In contrast to other methods of evaluating tumor-specific immunity in tumor tissues, our approach allows detection of intratumoral T-cell responses to nonmanipulated weakly immunogenic cancers. This detection method can be performed using basic laboratory skills, and facilitates the development and preclinical evaluation of new immunotherapies.
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Acknowledgements
We dedicate this article to Eva Wieckowski (who died unexpectedly on 14 December 2015). We thank T.J. Curiel for providing the ID8A ovarian cancer cell line, P. Lane for CD40L-expressing J558 cells, and M. Kronenberg for Flt3-L-expressing B16 cells. We thank K. Lemon for assistance with monitoring the mice and BLI, and P. Bailey for critical review and editorial comments. This work was supported by NIH grant CA132714 (to P.K.), by a 2015 CRI Clinical Strategy Team Grant (to P.K.), and by the David C. Koch Regional Therapy Cancer Center (D.L.B.).
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N.O., J.U., and R.R. participated in data generation; N.O. and J.U. selected and evaluated the experimental data; N.O., J.U., R.M., R.R., E.W., P.K., and D.L.B. participated in the design of the protocol; N.O. and P.K. wrote the manuscript.
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Methods of production and clinical use of human variants of type-1 polarized DCs are a subject of two US patents (to P.K.). The remaining authors declare no competing financial interests.
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Obermajer, N., Urban, J., Wieckowski, E. et al. Promoting the accumulation of tumor-specific T cells in tumor tissues by dendritic cell vaccines and chemokine-modulating agents. Nat Protoc 13, 335–357 (2018). https://doi.org/10.1038/nprot.2017.130
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DOI: https://doi.org/10.1038/nprot.2017.130
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