title: Stimulation of cytotoxic T cells against idiotype immunoglobulin of malignant lymphoma with protein-pulsed or idiotype-transduced dendritic cells.
abstract: Because of their hypervariable regions and somatic mutations, the antigen receptor molecules of lymphomas (idiotypes) are tumor-specific antigens and attractive targets for antilymphoma immunotherapy. For the optimal induction of human idiotype-specific cytotoxic T cells (CTL), idiotype was presented to CD8(+) peripheral blood mononuclear cells by monocyte-derived autologous dendritic cells (DC) after the endocytosis of idiotype protein or by idiotype-expressing DC. Recombinant idiotype was obtained as a functionally folded Fab fragment by periplasmic expression in Escherichia coli. Idiotype-expressing DC were generated by transduction with recombinant Semliki forest virus vectors encompassing heavy- or light-chain idiotype genes. Autologous lymphoblastoid cell lines stably transfected with Epstein-Barr virus-based idiotype expression vectors were used as target cells to detect idiotype-specific lysis. CTL stimulated with idiotype-loaded DC showed strong specific, CD8-mediated, and major histocompatibility complex (MHC) class I-restricted cytotoxicity against autologous heavy- and light-chain idiotype. In contrast, stimulation with idiotype-transduced DC resulted in only moderate natural killer cell activity. These data confirm the existence of idiotype-specific CTL in patients with lymphoma, define a "good manufacturing practice"-compatible protocol for the generation of these cells without the requirement of viable lymphoma cells, and favor the processing of exogenous antigen over DC transduction for the induction of MHC I-restricted CTL against idiotypes with unknown antigenicity. (Blood. 2000;95:1342-1349)
authors.affiliation: Departments of Hematology/Oncology and Pathology, Freiburg University Medical Center, Freiburg, Germany.
authors.forename: F
authors.initials: F
authors.lastname: Osterroth
authors.forename: A
authors.initials: A
authors.lastname: Garbe
authors.forename: P
authors.initials: P
authors.lastname: Fisch
authors.forename: H
authors.initials: H
authors.lastname: Veelken
mesh_terms: D000328:Adult; D000595:Amino Acid Sequence; D000914:Antibodies, Viral / Q000276:immunology; D001483:Base Sequence; D018414:CD8-Positive T-Lymphocytes / Q000276:immunology*; D003602:Cytotoxicity, Immunologic; D017931:DNA Primers; D003713:Dendritic Cells / Q000276:immunology*; D005260:Female; D006801:Humans; D007143:Immunoglobulin Heavy Chains / Q000235:genetics / Q000276:immunology; D007130:Immunoglobulin Idiotypes / Q000737:chemistry / Q000235:genetics / Q000276:immunology*; D007147:Immunoglobulin Light Chains / Q000235:genetics / Q000276:immunology; D015451:Leukemia, Lymphocytic, Chronic, B-Cell / Q000235:genetics / Q000276:immunology* / Q000473:pathology; D008224:Lymphoma, Follicular / Q000235:genetics / Q000276:immunology* / Q000473:pathology; D008297:Male; D008875:Middle Aged; D008969:Molecular Sequence Data; D009000:Monocytes / Q000276:immunology; D016133:Polymerase Chain Reaction; D011994:Recombinant Proteins / Q000737:chemistry / Q000276:immunology; D012672:Semliki forest virus / Q000276:immunology; D013602:T-Lymphocytes, Cytotoxic / Q000276:immunology*
chemical_list: D000914:Antibodies, Viral; D017931:DNA Primers; D007143:Immunoglobulin Heavy Chains; D007130:Immunoglobulin Idiotypes; D007147:Immunoglobulin Light Chains; D011994:Recombinant Proteins