title: Relative activities of distinct isotypes of murine and human major histocompatibility complex class II molecules in binding toxic shock syndrome toxin 1 and determination of CD antigens expressed on T cells generated upon stimulation by the toxin.
abstract: Relative abilities of murine and human major histocompatibility complex class II molecules to bind toxic shock syndrome toxin 1 (TSST-1) and T-cell subsets activated by the toxin were investigated. TSST-1 binding was observed in L cells transfected with I-Ab, I-Ak, DR2, and DQw1 genes. Scatchard plot analysis showed similar Kd values (1 x 10(-8) to 3 x 10(-8) M) for these cells. By comparison, binding was not detected in L cells transfected with I-Ek, DPw4, and DP(Cp63) genes. All of the transfectants supported TSST-1-induced proliferative response and interleukin-2 production by murine and human T cells. Levels of accessory activity were lower in the I-Ek transfectants and the DPw4 and DP(Cp63) transfectants than in the I-Ab and I-Ak transfectants and the DR2 and DQw1 transfectants, respectively. The results indicate that I-A, DR, and DQ molecules bind TSST-1 with similar affinities, whereas I-E and DP molecules bind it with fairly low affinity. TSST-1-activated T cells consisted of both CD4+ and CD8+ T cells, indicating that TSST-1 activates these two T-cell subsets.
authors.affiliation: Department of Microbiology, Tokyo Women's Medical College, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Uchiyama
authors.forename: S
authors.initials: S
authors.lastname: Saito
authors.forename: H
authors.initials: H
authors.lastname: Inoko
authors.forename: X J
authors.initials: XJ
authors.lastname: Yan
authors.forename: K
authors.initials: K
authors.lastname: Imanishi
authors.forename: M
authors.initials: M
authors.lastname: Araake
authors.forename: H
authors.initials: H
authors.lastname: Igarashi
mesh_terms: D000818:Animals; D000938:Antigen-Presenting Cells / Q000502:physiology; D000945:Antigens, Differentiation, T-Lymphocyte / Q000032:analysis*; D001427:Bacterial Toxins; D015704:CD4 Antigens / Q000032:analysis*; D016827:CD8 Antigens; D004768:Enterotoxins / Q000378:metabolism* / Q000494:pharmacology; D006683:HLA-DQ Antigens / Q000378:metabolism*; D006684:HLA-DR Antigens / Q000378:metabolism*; D000949:Histocompatibility Antigens Class II / Q000378:metabolism*; D006801:Humans; D007376:Interleukin-2 / Q000096:biosynthesis; D008213:Lymphocyte Activation; D051379:Mice; D008815:Mice, Inbred Strains; D013211:Staphylococcus aureus / Q000472:pathogenicity; D018089:Superantigens; D013601:T-Lymphocytes / Q000187:drug effects / Q000276:immunology*; D014162:Transfection
chemical_list: D000945:Antigens, Differentiation, T-Lymphocyte; D001427:Bacterial Toxins; D015704:CD4 Antigens; D016827:CD8 Antigens; D004768:Enterotoxins; D006683:HLA-DQ Antigens; D006684:HLA-DR Antigens; D000949:Histocompatibility Antigens Class II; D007376:Interleukin-2; D018089:Superantigens; C030107:enterotoxin F, Staphylococcal