title: Activation requirements for antigen- and mitogen-induced interferon-gamma release from cytotoxic T lymphocytes.
abstract: We have studied the activation signals that regulate interferon-gamma (IFN-gamma) secretion from murine cytotoxic T lymphocytes (CTL) upon binding mitogen or antigen. CTL clones were found to require at least 1 hr of stimulation with concanavalin A (Con A) in order to produce detectable levels of IFN-gamma. Full activation of IFN-gamma synthesis in CTL clones occurred after stimulation for 2 hr or more, and in those cultures CTL continued to produce high levels of IFN-gamma even after the effects of Con A had been neutralized. Splenic T cells and uncloned long-term CTL lines required a longer period of stimulation than cloned CTL for Con A-induced IFN-gamma secretion. The relationship between IFN-gamma secretion and cytotoxic activity was studied in an antigen-specific system. These studies reveal marked differences in the types of effector responses generated by CTL upon contact with antigen, demonstrating that some antigen-bearing cells promote high levels of IFN-gamma secretion and are poorly lysed by CTL, whereas other cell lines are lysed with high efficiency by CTL but induce low levels of IFN-gamma secretion.
authors.forename: J R
authors.initials: JR
authors.lastname: Klein
authors.forename: M S
authors.initials: MS
authors.lastname: Pasternack
authors.forename: M J
authors.initials: MJ
authors.lastname: Bevan
mesh_terms: D000818:Animals; D002450:Cell Communication; D002460:Cell Line; D003602:Cytotoxicity, Immunologic; D007371:Interferon-gamma / Q000096:biosynthesis*; D007519:Isoantigens / Q000276:immunology*; D008213:Lymphocyte Activation; D007959:Lymphocyte Culture Test, Mixed; D051379:Mice; D008807:Mice, Inbred BALB C; D008810:Mice, Inbred C57BL; D008934:Mitogens / Q000494:pharmacology*; D013602:T-Lymphocytes, Cytotoxic / Q000276:immunology / Q000378:metabolism*; D013997:Time Factors
chemical_list: D007519:Isoantigens; D008934:Mitogens; D007371:Interferon-gamma