title: HLA-DR-4-associated alloreactivity of an HLA-DR-3-restricted human tetanus toxoid-specific T cell clone: inhibition of both reactivities by an alloantiserum.
abstract: We present here the first report of a human helper/inducer T cell clone (F6) that specifically recognizes tetanus toxoid (TT) in the context of self-major histocompatibility complex (MHC) determinant(s) (HLA-DR3), and in addition recognizes a specific but unrelated MHC determinant(s) in the absence of conventional antigen. Extensive subcloning insured that the cells were progeny of a single cell. Furthermore, removal of the cells proliferating to the alloantigen with bromodeoxyuridine and light removed cells responding to both TT plus self-MHC and to the stimulating alloantigen, again indicating that F6 was the progeny of a single cell. The alloantigen recognized by this TT-specific clone appears to be closely linked to HLA-DR4 since cells from 13 of 14 HLA-DR4+ donors stimulated F6. An antiserum which recognizes HLA-DR4, when added to cultures, blocked the alloreactivity of F6, and in addition blocked its proliferation to TT plus HLA-DR3. Absorption of this antiserum with HLA-DR4+ cells or with TT-pulsed HLA-DR3+ cells removed its capacity to inhibit the proliferation of F6. These results suggest that the antigen recognition unit on F6 is stimulated both by allodeterminants expressed on HLA-DR4 cells and by TT plus HLA-DR3. These moieties cross-react at the T cell recognition level as well as at the antibody level.
authors.forename: D T
authors.initials: DT
authors.lastname: Umetsu
authors.forename: E J
authors.initials: EJ
authors.lastname: Yunis
authors.forename: Y
authors.initials: Y
authors.lastname: Matsui
authors.forename: H H
authors.initials: HH
authors.lastname: Jabara
authors.forename: R S
authors.initials: RS
authors.lastname: Geha
mesh_terms: D002999:Clone Cells / Q000276:immunology; D003429:Cross Reactions; D015803:HLA-DR3 Antigen; D015804:HLA-DR4 Antigen; D000949:Histocompatibility Antigens Class II / Q000276:immunology*; D006801:Humans; D007518:Isoantibodies / Q000276:immunology; D007519:Isoantigens / Q000276:immunology; D008213:Lymphocyte Activation; D006377:T-Lymphocytes, Helper-Inducer / Q000276:immunology*; D013745:Tetanus Toxoid / Q000276:immunology*
chemical_list: D015803:HLA-DR3 Antigen; D015804:HLA-DR4 Antigen; D000949:Histocompatibility Antigens Class II; D007518:Isoantibodies; D007519:Isoantigens; D013745:Tetanus Toxoid