title: Monoclonal antibody H9/25 reacts with functional subsets of T and B cells: killer, killer precursor and plaque-forming cells.
abstract: Monoclonal antibody (McAb) H9/25 has previously been shown to react with an alloantigen expressed on subpopulations of mouse lymphocytes. We here investigated the expression of the antigen (H9/25 Ag) on functional subsets of T and B cells. Lymphocytes were depleted of H9/25 Ag-bearing cells by complement-dependent cytolysis or by the affinity to immobilized McAb H9/25, and the residual immunological functions were tested. In these tests, killer T cells generated in mixed lymphocyte cultures and their precursors were found to express H9/25 Ag. In contrast, the activity and frequency of helper T cells specific to keyhole limpet hemocyanin carrier were not decreased by the depletion of H9/25 Ag-bearing cells. On the other hand, IgG and IgM anti-TNP plaque-forming cells were found to express H9/25 Ag, while it was not detected on unprimed B cells, as tested by using TNP-Ficoll and TNP-lipopolysaccharide. Only a small proportion of TNP memory B cells seemed to express the antigen. These results revealed significant differences between H9/25 Ag and other known alloantigens in the distribution among functional subsets of lymphocytes.
mesh_terms: D000818:Animals; D000906:Antibodies; D000917:Antibody Formation; D000921:Antibody-Producing Cells / Q000276:immunology*; D001402:B-Lymphocytes / Q000145:classification*; D002999:Clone Cells / Q000276:immunology; D003208:Concanavalin A / Q000494:pharmacology; D007156:Immunologic Memory; D007694:Killer Cells, Natural / Q000276:immunology; D007959:Lymphocyte Culture Test, Mixed; D051379:Mice; D008809:Mice, Inbred C3H; D008808:Mice, Inbred CBA; D013601:T-Lymphocytes / Q000145:classification*
chemical_list: D000906:Antibodies; D003208:Concanavalin A