Abstract
Regression of established tumors can be induced by adoptive immunotherapy (AIT) with tumor draining lymph node (DLN) lymphocytes activated with bryostatin and ionomycin (B/I). Tumor antigen-sensitized DLN lymphocytes from BALB/c mice with 10-day 4T1 mammary carcinomas were harvested, activated with B/I, and expanded in culture with either interleukin-2 (IL-2) or IL-7 + IL-15. Cell yields, proliferation, phenotypes, and in vitro responses to tumor antigen were compared for cells grown in different cytokines. These T cells were also tested for antitumor activity against established 4T1 mammary carcinomas after inoculation of tumor cells subcutaneously (s.c.). IL-7/15 resulted in much faster and more prolonged proliferation of B/I-activated T cells than culturing the same cells in IL-2. This resulted in approximately 5–10-fold greater yields of viable cells. Culture in IL-7/15 yielded higher proportions of CD8+ T cells and a higher proportion of cells with a central memory phenotype. T cells grown in IL-2 had higher interferon-gamma (IFN-γ) release responses to tumor antigen than cells grown in IL-7/15. Adoptive transfer of B/I-activated T cells grown in IL-7/15 demonstrated much greater efficacy against 4T1 tumors in vivo. Activation of tumor antigen-sensitized T cells with B/I and culture in IL-7 + IL-15 is a promising modification of standard regimens for production of T cells for use in AIT of cancer.
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Cha, E., Graham, L., Manjili, M.H. et al. IL-7 + IL-15 are superior to IL-2 for the ex vivo expansion of 4T1 mammary carcinoma-specific T cells with greater efficacy against tumors in vivo. Breast Cancer Res Treat 122, 359–369 (2010). https://doi.org/10.1007/s10549-009-0573-0
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DOI: https://doi.org/10.1007/s10549-009-0573-0