title: Phenotype of syngeneic tumor-specific cytotoxic T-lymphocytes and requirements for their in vitro generation from tumor-bearing host and immune spleens.
abstract: Cells required for the in vitro generation of syngeneic cytotoxic T-lymphocytes (CTL) against the P815 mastocytoma in the DBA/2 mouse strain were investigated. For both immune and tumor-bearing host spleen cells, CTL effector cells were eliminated by treatment with anti-Thy1.2, anti-Lyt1.1, or anti-Lyt2.1 and C', but were resistant to anti-L3T4 (GK1.5). Thus, CTL effectors (and their precursors) were Lyt1+2+, L3T4-. However, P815-specific CTL could not be generated in the absence of L3T4+ cells, whose function could be replaced with exogenous interleukin-2 (IL-2). When monoclonal antibodies against L3T4 were added to mixed leukocyte tumor cultures, CTL generation was markedly inhibited. Depletion of accessory cells also led to a marked reduction in CTL generation, which could be restored to control levels by adding adherent cells from normal spleens or with exogenous IL-2, but not with IL-1. Thus, accessory cells are apparently required to present the tumor antigens of this Ia-negative tumor to T-helper cells.
authors.affiliation: Department of Surgery, Medical College of Virginia, Virginia Commonwealth University, Richmond 23298.
authors.forename: H D
authors.initials: HD
authors.lastname: Bear
authors.forename: B M
authors.initials: BM
authors.lastname: Susskind
authors.forename: K A
authors.initials: KA
authors.lastname: Close
authors.forename: S K
authors.initials: SK
authors.lastname: Barrett
mesh_terms: D000818:Animals; D000938:Antigen-Presenting Cells / Q000502:physiology*; D007376:Interleukin-2 / Q000502:physiology; D051379:Mice; D008811:Mice, Inbred DBA; D009374:Neoplasms, Experimental / Q000276:immunology*; D010641:Phenotype; D013154:Spleen / Q000276:immunology*; D013602:T-Lymphocytes, Cytotoxic / Q000276:immunology*; D006377:T-Lymphocytes, Helper-Inducer / Q000502:physiology*
chemical_list: D007376:Interleukin-2