title: Effective induction of cell death on adult T-cell leukaemia cells by HLA-DRbeta-specific small antibody fragment isolated from human antibody phage library.
abstract: By a biopanning method using cell sorter, we quickly isolated an antibody phage clone (S1T-A3) specific to human T-lymphotropic virus type 1-carrying T-cell line S1T from a human single chain Fv (scFv) antibody phage library. This scFv antibody bound to HTLV-1-carrying T-cell lines including MT-2, MT-4 and M8166 other than S1T, but not to non-HTLV-1-carrying T-cell lymphomas such as Jurkat and MOLT4 cells. Interestingly, this antibody induced the cell death on S1T cells very quickly (< 30 min). We tried to identify the target molecules by western blotting and mass spectrometric analysis, revealing that the target antigen was HLA class II DR. The cell death was induced only in dimmer form of scFv (diabody) and at 15-fold lower concentration than that of a fusion protein of scFv and human IgG Fc [(scFv)(2)-Fc] or anti HLA-DR mouse whole antibody L243. Thus, S1T-A3 diabody is a small antibody fragment with agonistic activity to induce cell death through HLA-DR. This is the first report elucidating that diabody specific to HLA-DR is effective to induce the cell death in T-cell malignancy especially adult T-cell leukaemic cell line.
authors.affiliation: Department of Bioengineering, Faculty of Engineering, Kagoshima University, Korimoto 1-21-40, Kagoshima, Kagoshima 890-0065, Japan.
authors.forename: Satoshi
authors.initials: S
authors.lastname: Muraoka
authors.forename: Yuji
authors.initials: Y
authors.lastname: Ito
authors.forename: Masaki
authors.initials: M
authors.lastname: Kamimura
authors.forename: Masanori
authors.initials: M
authors.lastname: Baba
authors.forename: Naomichi
authors.initials: N
authors.lastname: Arima
authors.forename: Yasuo
authors.initials: Y
authors.lastname: Suda
authors.forename: Shuhei
authors.initials: S
authors.lastname: Hashiguchi
authors.forename: Masaharu
authors.initials: M
authors.lastname: Torikai
authors.forename: Toshihiro
authors.initials: T
authors.lastname: Nakashima
authors.forename: Kazuhisa
authors.initials: K
authors.lastname: Sugimura
mesh_terms: D000818:Animals; D017209:Apoptosis / Q000187:drug effects*; D002460:Cell Line; D045744:Cell Line, Tumor; D004797:Enzyme-Linked Immunosorbent Assay; D005434:Flow Cytometry; D006684:HLA-DR Antigens / Q000276:immunology*; D006801:Humans; D007128:Immunoglobulin Fragments / Q000276:immunology* / Q000494:pharmacology*; D015458:Leukemia, T-Cell / Q000473:pathology*; D013058:Mass Spectrometry; D051379:Mice; D019151:Peptide Library
chemical_list: D006684:HLA-DR Antigens; D007128:Immunoglobulin Fragments; D019151:Peptide Library