title: Enhancement of antigen-specific activation of CD8+ memory cytotoxic T cells by B cell-derived factors.
abstract: Purified CD8+ T cells from influenza A/WSN-immune BALB/c (H-2d) mice respond with the generation of secondary A/WSN-specific Tc cells in vitro when stimulated with a synthetic peptide (NPP) with a sequence derived from influenza A virus nucleoprotein with high affinity for Kd class I MHC molecules. The process of the conversion of NPP-Kd-responding Tc cell precursors into effector Tc cells in a population of CD8+ T cells occurs with no demonstrable requirements for accessory cells or their lymphokine products. The addition of culture supernatants from several mouse and human B cell lymphomas and LPS-activated normal mouse B cells to the culture of NPP-stimulated immune CD8+ T cells enhanced the induction of secondary Ag-specific Tc cells. None of the tested supernatants in the absence of Ag (NPP) induced cytolytic Tc cells, indicating that B cell-derived secretory factors can exert their activity only on Ag-exposed CD8+ T cells. The augmentatory effect of these supernatants on Ag-specific activation of memory CD8+ T cells was attributed to the synergism between B cell-derived factors and IL-2 which is produced endogenously in cultures of NPP-stimulated D8+ T cells. The possible role of B cell-derived helper factors is discussed.
authors.affiliation: Division of Cell Biology, John Curtin School of Medical Research, Australian National University, Canberra, ACT.
authors.forename: F J
authors.initials: FJ
authors.lastname: Kos
authors.forename: A
authors.initials: A
authors.lastname: Müllbacher
mesh_terms: D000818:Animals; D000956:Antigens, Viral / Q000276:immunology; D016827:CD8 Antigens / Q000032:analysis; D002478:Cells, Cultured; D017077:Culture Media, Conditioned / Q000494:pharmacology; D005260:Female; D007156:Immunologic Memory / Q000187:drug effects*; D009980:Influenza A virus / Q000276:immunology; D008213:Lymphocyte Activation / Q000187:drug effects*; D008222:Lymphokines / Q000494:pharmacology*; D016393:Lymphoma, B-Cell; D051379:Mice; D008807:Mice, Inbred BALB C / Q000276:immunology; D019590:Nucleocapsid Proteins; D009698:Nucleoproteins / Q000276:immunology*; D010446:Peptide Fragments / Q000276:immunology; D016601:RNA-Binding Proteins; D013268:Stimulation, Chemical; D013602:T-Lymphocytes, Cytotoxic / Q000187:drug effects* / Q000276:immunology; D014407:Tumor Cells, Cultured; D014758:Viral Core Proteins / Q000276:immunology*
chemical_list: D000956:Antigens, Viral; D016827:CD8 Antigens; D017077:Culture Media, Conditioned; D008222:Lymphokines; C048842:NP protein, Influenza A virus; D019590:Nucleocapsid Proteins; D009698:Nucleoproteins; D010446:Peptide Fragments; D016601:RNA-Binding Proteins; D014758:Viral Core Proteins