Abstract
In the MD45 mouse cytotoxic T lymphocyte (CTL) hybridoma cell line, we have expressed a chimeric receptor, consisting of the single-chain variable domains (scFv) of anti-carcinoma embryonic antigen (CEA) mAb linked to Fcgamma receptor (FcgammaR) chain via a CD8 hinge. Transfected MD45 subclones lysed CEA-positive human colon carcinoma cell lines in an antigen-specific and FasL-dependent manner. The degree of lysis correlated with the level of chimeric receptor expressed on transduced MD45 subclones. The requirement for an intact Y65TGL motif in the signaling gamma chain suggested that interaction of the chimeric receptor with target cell CEA induced the cytotoxicity of MD45-scFv subclones. However, MD45 expressing a Y65F mutant chimera still displayed minor levels of lysis following PMA stimulation, suggesting that PMA could bypass gamma chain induction of functional FasL. Pretreatment of Fas-resistant CEA-positive colon carcinoma target cells with IFN-gamma increased their sensitivity of MD45-scFv subclones and FasL-mediated lysis. This study has demonstrated the successful activation of FasL function via a chimeric receptor introduced into lymphocytes and the susceptibility of human colon carcinoma to combined cytokine and CTL treatment.
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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Animals
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Antibodies, Monoclonal / biosynthesis*
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Antibodies, Monoclonal / genetics
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Antibodies, Monoclonal / pharmacology
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COS Cells
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Carcinoembryonic Antigen / immunology*
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Carcinoembryonic Antigen / physiology
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Carcinoma / immunology*
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Clone Cells
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Colonic Neoplasms / immunology*
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Cytotoxicity, Immunologic* / drug effects
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Cytotoxicity, Immunologic* / genetics
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Fas Ligand Protein
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Gene Expression / immunology
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HT29 Cells
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Humans
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Hybridomas
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Immunoglobulin Fragments / biosynthesis
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Immunoglobulin Fragments / genetics
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Immunoglobulin Fragments / pharmacology
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Immunoglobulin Variable Region / biosynthesis
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Immunoglobulin Variable Region / genetics
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Immunoglobulin Variable Region / pharmacology
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Interferon-gamma / pharmacology
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Jurkat Cells
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Ligands
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Membrane Glycoproteins / pharmacology*
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Mice
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Receptors, IgG / biosynthesis
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Receptors, IgG / genetics
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Receptors, IgG / metabolism
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Recombinant Fusion Proteins / biosynthesis
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Recombinant Fusion Proteins / metabolism
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Recombinant Fusion Proteins / pharmacology
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T-Lymphocytes, Cytotoxic / immunology*
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T-Lymphocytes, Cytotoxic / metabolism
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Tumor Cells, Cultured
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Up-Regulation / immunology
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fas Receptor / metabolism*
Substances
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Antibodies, Monoclonal
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Carcinoembryonic Antigen
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FASLG protein, human
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Fas Ligand Protein
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Fasl protein, mouse
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Immunoglobulin Fragments
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Immunoglobulin Variable Region
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Ligands
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Membrane Glycoproteins
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Receptors, IgG
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Recombinant Fusion Proteins
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fas Receptor
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immunoglobulin Fv
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Interferon-gamma