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Development of Adoptive Immunotherapy with KK-LC-1-specific TCR-transduced γδT Cells Against Lung Cancer Cells

Overview
Journal Cancer Sci
Specialty Oncology
Date 2020 Aug 12
PMID 32780528
Citations 10
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Abstract

The present study analyzed the antitumor effect of γδT cells transduced with the TCR of cancer-specific CTLs to establish forceful cancer-specific adoptive immunotherapy. We cloned the TCRαβ genes from CTLs showing HLA-B15 restricted recognition of Kita-Kyushu lung cancer antigen-1 (KK-LC-1), a cancer/germline gene antigen, identified in a lung adenocarcinoma case (F1121). The TCRαβ and CD8 genes were transduced into γδT cells induced from PBLs of healthy volunteers stimulated with zoledronate and IL-2. The KK-LC-1-specific TCRαβ-CD8 γδT cells showed cytotoxic activity against the KK-LC-1 positive lung cancer cell line F1121L and produced IFN-γ against F1121L and KK-LC-1 peptide-pulsed F1121 EBV-B cells. These responses were blocked by HLA class I and HLA-B/C antibodies. An in vivo assay using NOD/SCID mice with xenotransplantation of human lung cancer cells was performed, and the TCRαβ-CD8 transduced γδT cells (TCRαβ-CD8 γδT cells) were intravenously injected. Growth inhibition of KK-LC-1 , HLA-B15 lung cancer cells was confirmed in mice with injection of the TCRαβ-CD8 γδT cells from 1 wk after xenotransplantation of cancer cells but not in those treated 2 wk after xenotransplantation. The resected specimens of the tumor, 2 wk after xenotransplantation, highly expressed FasL but not programmed death ligand-1 (PD-L1) by immunohistochemical staining. FasL highly expressed cancer cells xenotransplanted 2 wk ago were resistant to TCRαβ-CD8 γδT cells injection. These results suggested that apoptosis of Fas-positive TCRαβ-CD8 γδT cells may be induced by a Fas-mediated signal after interacting with FasL-positive cancer cells.

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