title: Inhibition of the mixed lymphocyte culture response with anti-Lyb-4.1 serum 1,2,.
abstract: C57BL/Ks anti-L1210 serum, which recognized a non-H-2-linked B cell alloantigen, designated Lyb-4.1, specifically blocked the mixed lymphocyte culture (MLC) response to allogeneic cells that expressed the Lyb-4.1 determinant. Anti-Lyb-4,1 serum blocked the MLC response across H-2 and MLC disparities. To test that this effect was not the result of a toxic or nonspecific cell-coating action, the response of parental cells to F1 lymphocytes was studied in combinations in which only one parent expressed the recognized allele. MLC stimulation was blocked only when the responding parental cell recognized on the F1 cell H-2 or MLs disparities which were derived from the parent which possessed the Lyb-4.1 antigen. Several DBA/2 tumors were characterized by cytotoxic and quantitation absorption assays for the presence of the B cell antigen. The presence of the antigen correlated with the ability of a limited number of tumors to stimulate the MLC response of H-2d identical BALB/c lymphocytes. An increased representation of the B cell alloantigen was found on the transformed B lymphoblast cell line in comparison to splenic B lymphocytes.
mesh_terms: D000818:Animals; D000912:Antibodies, Neoplasm; D000951:Antigens, Neoplasm / Q000032:analysis; D000961:Antilymphocyte Serum; D001402:B-Lymphocytes / Q000276:immunology*; D002462:Cell Membrane / Q000276:immunology; D000939:Epitopes; D005796:Genes; D006648:Histocompatibility; D007519:Isoantigens / Q000032:analysis; D007939:Leukemia L1210 / Q000276:immunology; D007959:Lymphocyte Culture Test, Mixed; D051379:Mice; D008810:Mice, Inbred C57BL; D008811:Mice, Inbred DBA; D009374:Neoplasms, Experimental / Q000276:immunology; D013045:Species Specificity; D013154:Spleen / Q000276:immunology
chemical_list: D000912:Antibodies, Neoplasm; D000951:Antigens, Neoplasm; D000961:Antilymphocyte Serum; D000939:Epitopes; D007519:Isoantigens