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  • Title: HLA Tetramer Based Artificial Antigen-Presenting Cells Efficiently Stimulate CTLs Specific for Malignant Glioma.
    Author: Jiang X, Lu X, Liu R, Zhang F, Zhao H.
    Journal: Clin Cancer Res; 2007 Dec 15; 13(24):7329-34. PubMed ID: 18094414.
    Abstract:
    PURPOSE: The interleukin-13 receptor alpha 2 (IL-13R alpha 2) is a glioma-restricted cell-surface epitope not otherwise detected within the central nervous system. Here, we report a novel approach for targeting malignant glioma with IL-13R alpha 2-specific CTLs. EXPERIMENTAL DESIGN: Artificial antigen-presenting cells (aAPC) were made by coating human leukocyte antigen (HLA)-A2/pIL-13R alpha 2(345-354) tetrameric complexes, anti-CD28 antibody, and CD83 molecules to cell-sized latex beads, and used to stimulate IL-13R alpha 2-specific CTLs from the peripheral blood mononuclear cells of HLA-A2+ healthy donors. After multiple stimulations, the induced CTLs were analyzed for tetramer staining, IFN-gamma production, and CTL reactivity. RESULTS: Tetramer staining assay showed that the induced CTLs specifically bound HLA-A2/pIL-13R alpha 2(345-354) tetramers. The CTLs specifically produced IFN-gamma in response to the HLA-A2/pIL-13R alpha 2(345-354)-aAPCs and exhibited specific lysis against T2 cells pulsed with the peptide pIL-13R alpha 2(345-354) and HLA-A2+ glioma cells expressing IL-13R alpha 2(345-354), whereas HLA-A2(-) glioma cell lines that express IL-13R alpha 2(345-354) could not be recognized by the CTLs. The peptide-specific activity was inhibited by anti-HLA class I monoclonal antibody. CONCLUSION: The induced CTLs specific for IL-13R alpha 2(345-354) peptide could be a potential target of specific immunotherapy for HLA-A2+ patients with malignant glioma.
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