Generation of allo-restricted cytotoxic T lymphocytes against malignant glioma by artificial antigen-presenting cells

The interleukin (IL) 13 receptor α2 (IL-13Rα2) is a glioma-restricted cell-surface epitope not otherwise detected within the central nervous system. This study reported a novel approach for targeting malignant glioma with IL-13Rα2-specific allo-restricted cytotoxic T cells (CTLs) induced from the peripheral blood lymphocytes (PBLs) of HLA-A2-negative healthy donors by multiple stimulations with artificial antigen-presenting cells (aAPCs) made by coating HLA-A2/pIL-13Rα2345–354 tetrameric complexes, anti-CD28 antibody and CD83 molecules to cell-sized latex beads. The induced allo-restricted CTLs exhibited specific lysis against T2 cells pulsed with the peptide pIL-13Rα2345–354 and HLA-A2+ glioma cells expressing IL-13Rα2345–354, while HLA-A2− glioma cell lines that express IL-13Rα2345–354 could not be recognized by the CTLs. The peptide-specific activity was inhibited by anti-HLA class I monoclonal antibody. These results suggested the induced allo-restricted CTLs specific for IL-13Rα2345–354 peptide could be a potential target of specific immunotherapy for HLA-A2+ patients with malignant glioma.