Abstract
Adoptive transfer of Bispecific antibody Armed activated T cells (BATs) showed promising anti-tumor activity in clinical trials in solid tumors. The cytotoxic activity of BATs occurs upon engagement with tumor cells via the bispecific antibody (BiAb) bridge, which stimulates BATs to release cytotoxic molecules, cytokines, chemokines, and other signaling molecules extracellularly. We hypothesized that the release of BATs Induced Tumor-Targeting Effectors (TITE) by this complex interaction of T cells, bispecific antibody, and tumor cells may serve as a potent anti-tumor and immune-activating immunotherapeutic approach. In a 3D tumorsphere model, TITE showed potent cytotoxic activity against multiple breast cancer cell lines compared to control conditioned media (CM): Tumor-CM (T-CM), BATs-CM (B-CM), BiAb Armed PBMC-CM (BAP-CM) or PBMC-CM (P-CM). Multiplex cytokine analysis showed high levels of Th1 cytokines and chemokines; phospho-protein signaling array data suggest that the prominent JAK1/STAT1 pathway may be responsible for the induction and release of Th1 cytokines/chemokines in TITE. In xenograft breast cancer models, IV injections of 10× concentrated TITE (3×/week for 3 weeks; 150 μl TITE/injection) was able to inhibit tumor growth significantly (ICR/scid, p < 0.003; NSG p < 0.008) compared to the control mice. We tested the key components of the TITE for immune activating and anti-tumor activity individually and in combinations, the combination of IFN-γ, TNF-α and MIP-1β recapitulates the key activities of the TITE. In summary, master mix of active components of BATs–Tumor complex-derived TITE can provide a clinically controllable cell-free platform to target various tumor types regardless of the heterogeneous nature of the tumor cells and mutational tumor.
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Acknowledgements
Authors would like to thank Dr. Manley T. Huang for his help with antigen expression on tumor cells. These studies were funded in part by R01 CA 092344 (L.G.L.), R01 CA 140412 (L.G.L), 5P39 CA 022453 from the National Cancer Institute, and startup funds from the Barbara Ann Karmanos Cancer Institute and the University of Virginia.
Funding
This study was primarily supported by funding from in part by DHHS R01 CA 092344, R01 CA 140314, R01 CA 182526, P30CA022453 (Microscopy, Imaging, and Cytometry Resources Core) and startup funds from the University of Virginia Cancer Center.
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AT and LGL conceived and designed the study, performed statistical analysis, and wrote the manuscript. LGL and BFS participated in the design of the study and helped in drafting the manuscript. SVK, KJ, DLS, EB, JU, AA, EC performed the experiments and participated in the data analysis. All authors read and approved the final manuscript.
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AT is co-founder of Nova Immune Platform Inc.; LGL is co-founders of TransTarget, Inc; SVK, KJ, DLS, EB, JU, AA, EC and BFS have no conflict of interest. The data presented in this manuscript are original and have not been published elsewhere except in the form of abstracts and poster presentations at symposia and meetings.
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Thakur, A., Kondadasula, S.V., Ji, K. et al. Anti-tumor and immune modulating activity of T cell induced tumor-targeting effectors (TITE). Cancer Immunol Immunother 70, 633–656 (2021). https://doi.org/10.1007/s00262-020-02692-8
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DOI: https://doi.org/10.1007/s00262-020-02692-8