title: Role of IL-6, IL-2, and IL-4 in the in vitro induction of cytotoxic T cells.
abstract: The mode of IL-6-induced differentiation of Con A-stimulated CD4-CD8+ CTL-P was examined. Through application of neutralizing anti-IL-6, anti-IL-2, and anti-IL-4 mAb it was shown that IL-6 is an "early acting" factor for development of accessory cell-depleted thymocytes. IL-2 and IL-4 are obligatory "late acting" factors for this process. In accordance IL-4, but not IL-6, induced active CTL from CD4-CD8+ CTL-P. The increase of CD4-CD8+ CTL originates at least partially from CD4+CD8+ cells differentiating to active CTL in vitro. CTL development was paralleled by an increase in CD4-CD8+ cells and by a distinct increase in [3H]TdR uptake on day 2 of cultivation. Our data suggest that IL-6 induces Th cells to produce IL-2 and IL-4, the mediators for final differentiation of CD4-CD8+ cells.
authors.affiliation: Deutsche Sammlung von Mikroorganismen und Zellkulturen, Bereich Menschliche und Tierische Zellkulturen, Braunschweig, Germany.
authors.forename: H
authors.initials: H
authors.lastname: Quentmeier
authors.forename: J
authors.initials: J
authors.lastname: Klaucke
authors.forename: P F
authors.initials: PF
authors.lastname: Mühlradt
authors.forename: H G
authors.initials: HG
authors.lastname: Drexler
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal / Q000276:immunology; D015704:CD4 Antigens / Q000032:analysis; D016827:CD8 Antigens / Q000032:analysis; D002454:Cell Differentiation; D005260:Female; D066298:In Vitro Techniques; D007375:Interleukin-1 / Q000502:physiology; D007376:Interleukin-2 / Q000502:physiology*; D015847:Interleukin-4 / Q000502:physiology*; D015850:Interleukin-6 / Q000502:physiology*; D008213:Lymphocyte Activation; D051379:Mice; D008808:Mice, Inbred CBA; D011994:Recombinant Proteins / Q000494:pharmacology; D013602:T-Lymphocytes, Cytotoxic / Q000502:physiology*
chemical_list: D000911:Antibodies, Monoclonal; D015704:CD4 Antigens; D016827:CD8 Antigens; D007375:Interleukin-1; D007376:Interleukin-2; D015850:Interleukin-6; D011994:Recombinant Proteins; D015847:Interleukin-4