title: Prethymic nylon wool-passed bone marrow cells, substituting for helper T cells, can augment the generation of cytotoxic T lymphocytes from their precursors.
abstract: Nylon wool-passed bone marrow (NW-BM) cells treated with anti-Thy.1 monoclonal antibody and complement were added to a mixed lymphocyte culture which contained a limiting number of lymph node cells, as responder cells, and a sufficient number of mitomycin-c-treated allogeneic spleen cells as stimulator cells. NW-BM cells of the same MHC haplotype as responder cells enhanced the generation of allo-specific cytotoxic T lymphocytes (CTL) not only at a relatively high dose (3 x 10(3) cells/well) of responder cells, but also at an extremely dilute dose (1 x 10(3) cells/well). NW-BM cells which had a third-party MHC haplotype, a haplotype different from both responder and stimulator cells, also enhanced the generation of CTL at relatively high doses, but not at low doses, of responder cells. NW-BM cells which had MHC haplotypes identical with those of responder cells induced CTL from helper T cell-depleted responder cells, but NW-BM cells which had the third-party haplotype did not. These results showed that the enhancing effects of NW-BM cells of the same MHC haplotype as responder cells might be due to a specific helper effect and the enhancing effect of NW-BM cells of the third-party haplotype might be due to a nonspecific filler effect, which only conditioned the cultured cells. It was also found that, to exhibit the helper effect, NW-BM cells had to possess MHC class II, but not MHC class I, molecules in common with CTL precursors. This study showed that in the induction of CTL, prethymic NW-BM cells had a capability comparable to that of mature helper T cells.
authors.affiliation: Department of Bacteriology, School of Medicine, University of the Ryukyus, Okinawa, Japan.
authors.forename: M J
authors.initials: MJ
authors.lastname: Tanabe
mesh_terms: D000818:Animals; D001853:Bone Marrow / Q000276:immunology*; D001854:Bone Marrow Cells; D002454:Cell Differentiation / Q000276:immunology; D002469:Cell Separation; D003602:Cytotoxicity, Immunologic; D005260:Female; D006183:H-2 Antigens / Q000276:immunology; D006239:Haplotypes; D000949:Histocompatibility Antigens Class II / Q000276:immunology; D008198:Lymph Nodes / Q000276:immunology; D008213:Lymphocyte Activation / Q000276:immunology; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D009757:Nylons; D013602:T-Lymphocytes, Cytotoxic / Q000276:immunology*; D006377:T-Lymphocytes, Helper-Inducer / Q000276:immunology*; D013950:Thymus Gland / Q000276:immunology
chemical_list: D006183:H-2 Antigens; D000949:Histocompatibility Antigens Class II; D009757:Nylons