title: Activation of murine T cells by toxic shock syndrome toxin-1. The toxin-binding structures expressed on murine accessory cells are MHC class II molecules.
abstract: Toxic shock syndrome toxin-1 (TSST-1)-binding structures present on murine lymphoid tissues were investigated by using 125I-TSST-1. T-depleted C57BL/6 spleen cells incubated with TSST-1 for 3 h at 0 degree C were mitogenic to splenic T cells, indicating that the former cells bind and present TSST-1 to T cells. TSST-1-binding activity was observed in C57BL/6 splenic B cells and L cells transfected with I-Ab genes, but not in splenic T cells and control L cells. Scatchard plot analysis showed that these B cells and transfectants bound TSST-1 with similar binding affinity. SDS-PAGE analysis showed that lysates of C57BL/6 spleen cells and the I-Ab-positive transfectants contain a single band which bound TSST-1 and comigrated with I-Ab heterodimers. TSST-1-binding activity observed clearly in C57BL/6. BALB/c, and C3H/HeN spleen cells and L cells transfected with I-Ab or I-Ak genes was not reduced by paraformaldehyde fixation. Binding of 125I-TSST-1 to the three spleen cells was markedly reduced by anti-I-A antibodies, but not by anti-I-E antibodies. C57BL/6, C3H/HeN, and (C3H/HeN x C57BL/6) F1 T cells were activated by TSST-1 to proliferate and produce IL-2 in the presence of FT6.2 cells, LT1-30-3 cells and either of them, respectively, but not in the presence of control L cells. These results indicate that I-A molecules function as the structures via that accessory cells directly bind TSST-1 on the cell surface and present a triggering signal of TSST-1 to T cells.
authors.affiliation: Department of Microbiology, Tokyo Women's Medical College, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Uchiyama
authors.forename: T
authors.initials: T
authors.lastname: Tadakuma
authors.forename: K
authors.initials: K
authors.lastname: Imanishi
authors.forename: M
authors.initials: M
authors.lastname: Araake
authors.forename: S
authors.initials: S
authors.lastname: Saito
authors.forename: X J
authors.initials: XJ
authors.lastname: Yan
authors.forename: H
authors.initials: H
authors.lastname: Fujikawa
authors.forename: H
authors.initials: H
authors.lastname: Igarashi
authors.forename: N
authors.initials: N
authors.lastname: Yamaura
mesh_terms: D000818:Animals; D000938:Antigen-Presenting Cells / Q000276:immunology / Q000378:metabolism*; D001427:Bacterial Toxins; D002469:Cell Separation; D004768:Enterotoxins / Q000276:immunology* / Q000378:metabolism; D005260:Female; D005802:Genes, MHC Class II; D000949:Histocompatibility Antigens Class II / Q000032:analysis* / Q000235:genetics; D007700:Kinetics; D007739:L Cells; D008213:Lymphocyte Activation; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D008809:Mice, Inbred C3H; D008810:Mice, Inbred C57BL; D011946:Receptors, Antigen / Q000032:analysis* / Q000235:genetics; D013154:Spleen / Q000276:immunology / Q000378:metabolism; D013211:Staphylococcus aureus / Q000276:immunology*; D018089:Superantigens; D013601:T-Lymphocytes / Q000276:immunology*; D014162:Transfection
chemical_list: D001427:Bacterial Toxins; D004768:Enterotoxins; D000949:Histocompatibility Antigens Class II; D011946:Receptors, Antigen; D018089:Superantigens; C030107:enterotoxin F, Staphylococcal