Abstract
In this study, we investigated whether activated T cells (ATC) armed with bispecific antibodies (aATC) can inhibits tumor growth and MDSC development in a Th1 cytokine–enriched (IL-2 and IFN-γ) microenvironment. Cytotoxicity mediated by aATC was significantly higher (P < 0.001) against breast cancer cell lines in the presence of Th1 cytokines as compared with control co-cultures. In the presence of aATC, CD33+/CD11b+/CD14−/HLA-DR− MDSC population was reduced significantly under both control (P < 0.03) and Th1-enriched (P < 0.036) culture conditions. Cytokine analysis in the culture supernatants showed high levels of MDSC suppressive chemokines CXCL9 and CXCL10 in Th1-enriched culture supernatants with highly significant increase (P < 0.001) in the presence of aATC. Interestingly, MDSC recovered from co-cultures without aATC showed potent ability to suppress activated T-cell-mediated cytotoxicity (P < 0.001), IFN-γ production (P < 0.01) and T-cell proliferation (P < 0.05) compared to those recovered from aATC-containing co-cultures. These data suggest that aATC can mediate enhanced killing of tumor cells and may suppress MDSC and Treg differentiation, and presence of Th1 cytokines potentiates aATC-induced suppression of MDSC, suggesting that Th1-enriching immunotherapy may be beneficial in cancer treatment.
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Acknowledgments
These studies were funded in part by R01 CA 092344 (L.G.L.), R01 CA 140412 (L.G.L), 5P39 CA 022453 from National Cancer Institute, Translational Grants #6066-06 and #6092-09 from the Leukemia and Lymphoma Society (L.G.L), Susan G. Komen Foundation Translational Grant #BCTR0707125 (L.G.L), and Michigan Cell Therapy Center for Excellence Grant from the State of Michigan #1819, and startup funds from the Barbara Ann Karmanos Cancer Institute.
Conflict of interest
L.G.L. hold founder’s shares of Trans_target, Inc. The other authors have no financial conflict of interest.
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Thakur, A., Schalk, D., Sarkar, S.H. et al. A Th1 cytokine–enriched microenvironment enhances tumor killing by activated T cells armed with bispecific antibodies and inhibits the development of myeloid-derived suppressor cells. Cancer Immunol Immunother 61, 497–509 (2012). https://doi.org/10.1007/s00262-011-1116-1
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DOI: https://doi.org/10.1007/s00262-011-1116-1