title: Allostimulatory analysis of a newly-defined and widely-distributed Mls superantigen.
abstract: We previously noted that Mlsa,c C58/J responder cells proliferated unexpectedly to H-2k-compatible Mlsa or Mlsc prototypic stimulator cells in a primary mixed lymphocyte reaction. The present investigation was performed to evaluate whether the response of C58/J T cells to these H-2- and Mls-compatible stimulator cells could functionally identify a newly-defined member of the Mls superantigen family through its allostimulatory ability. We observed that C58/J responder cells also proliferated when cultured with H-2-compatible prototypic Mls(null), Mlsb (nonstimulatory), or Mlsa,c splenic stimulator cells. The widely distributed nature of the non-MHC ligand recognized by C58/J T cells is indicated by the finding that 11 of 12 H-2k inbred mouse strains clearly expressed this specificity. A gradient of stimulatory capacity from low to high across this newly-defined non-MHC difference was detected with splenocytes from these different inbred mouse strains. The Mls(a,c) genetic composition of C58/J was confirmed by the observation that crossing C58/J with parental B10.BR (responsive to both Mlsa and Mlsc determinants) generated F1 progeny that were unresponsive to H-2k-compatible Mlsa, Mlsc, or Mls(a,c) stimulator cells. Like prototypic Mlsa and Mlsc, the non-MHC specificity recognized by C58/J responder cells, termed Mlsf, was particularly sensitive to radiation (versus mitomycin C) treatment of the stimulator cells, was greatly augmented after anti-IgD activation of splenic stimulator cells, was blocked with anti-MHC class II antibody, and was effectively presented by phenotypically normal female but not B cell-defective xid+ male CBA/N F1 stimulator cells.
authors.affiliation: Immunobiology and Transplantation Department, Naval Medical Research Institute, Bethesda, MD 20889-5055.
authors.forename: J J
authors.initials: JJ
authors.lastname: Ryan
authors.forename: H B
authors.initials: HB
authors.lastname: LeJeune
authors.forename: J J
authors.initials: JJ
authors.lastname: Mond
authors.forename: F D
authors.initials: FD
authors.lastname: Finkelman
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal / Q000276:immunology; D000954:Antigens, Surface / Q000276:immunology*; D000939:Epitopes; D005260:Female; D006183:H-2 Antigens / Q000276:immunology; D008213:Lymphocyte Activation; D007959:Lymphocyte Culture Test, Mixed; D008297:Male; D051379:Mice; D008809:Mice, Inbred C3H; D008808:Mice, Inbred CBA; D016747:Minor Lymphocyte Stimulatory Antigens; D013601:T-Lymphocytes / Q000276:immunology
chemical_list: D000911:Antibodies, Monoclonal; D000954:Antigens, Surface; D000939:Epitopes; D006183:H-2 Antigens; D016747:Minor Lymphocyte Stimulatory Antigens