Abstract
Bispecific T cell-engaging (BiTE) antibodies recruit polyclonal cytotoxic T cells (CTL) to tumors. One such antibody is carcinoembryonic antigen (CEA) BiTE that mediates T cell/tumor interaction by simultaneously binding CD3 expressed by T cells and CEA expressed by tumor cells. A widely operative mechanism for mitigating cytotoxic T cell-mediated killing is the interaction of tumor-expressed PD-L1 with T cell-expressed PD-1, which may be partly reversed by PD-1/PD-L1 blockade. We hypothesized that PD-1/PD-L1 blockade during BiTE-mediated T cell killing would enhance CTL function. Here, we determined the effects of PD-1 and PD-L1 blockade during initial T cell-mediated killing of CEA-expressing human tumor cell lines in vitro, as well as subsequent T cell-mediated killing by T lymphocytes that had participated in tumor cell killing. We observed a rapid upregulation of PD-1 expression and diminished cytolytic function of T cells after they had engaged in CEA BiTE-mediated killing of tumors. T cell cytolytic activity in vitro could be maximized by administration of anti-PD-1 or anti-PD-L1 antibodies alone or in combination if applied prior to a round of T cell killing, but T cell inhibition could not be fully reversed by this blockade once the T cells had killed tumor. In conclusion, our findings demonstrate that dual blockade of PD-1 and PD-L1 maximizes T cell killing of tumor directed by CEA BiTE in vitro, is more effective if applied early, and provides a rationale for clinical use.
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Abbreviations
- ALL:
-
Acute lymphoblastic leukemia
- APC:
-
Allophycocyanin
- BiTE:
-
Bispecific T cell engaging
- CEA:
-
Carcinoembryonic antigen
- CTLA-4:
-
Cytotoxic T lymphocyte-associated protein 4
- EDTA:
-
Ethylenediaminetetraacetic acid
- FITC:
-
Fluorescein isocyanate
- mAb:
-
Monoclonal antibody
- MDSC:
-
Myeloid-derived suppressor cells
- MFI:
-
Mean fluorescence intensity
- NOD/SCID:
-
Non-obese diabetic/severe combined immunodeficiency
- PBMC:
-
Peripheral blood mononuclear cell
- PD-1:
-
Programmed cell death 1
- PD-L1:
-
Programmed death-ligand 1
- PE:
-
Phycoerythrin
- PerCP:
-
Peridinin chlorophyll protein
- Treg:
-
Regulatory T cell
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Acknowledgments
Supported by a Grant from MedImmune LLC to Takuya Osada.
Conflict of interest
Scott A. Hammond is an employee of MedImmune LCC, which supplied CEA BiTE for this study. The other authors disclose no potential conflicts of interest.
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BiTE ® is a registered trademark of Amgen.
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Osada, T., Patel, S.P., Hammond, S.A. et al. CEA/CD3-bispecific T cell-engaging (BiTE) antibody-mediated T lymphocyte cytotoxicity maximized by inhibition of both PD1 and PD-L1. Cancer Immunol Immunother 64, 677–688 (2015). https://doi.org/10.1007/s00262-015-1671-y
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DOI: https://doi.org/10.1007/s00262-015-1671-y