title: IL-2 dependence of IL-9 expression in human T lymphocytes.
abstract: Human IL-9 is a T cell-derived lymphokine that is abundantly expressed upon activation with mitogens. The observation that IL-9 induction peaks as late as 28 h after stimulation suggested the involvement of secondary signals in this process. The finding reported here that IL-9 expression is blocked by cycloheximide strongly supports this hypothesis. Moreover, we identify IL-2 as the critical element controlling IL-9 expression in T cells. We show (i) that anti-IL-2R antibodies block IL-9 expression in T cells stimulated with PMA and anti-CD3 and (ii) that IL-2, of a panel of cytokines, is the only molecule that synergizes with PMA for IL-9 induction. The latter finding is confirmed in a T cell leukemia line. Finally, we demonstrate that IL-2 plays a regulatory role in the induction of other cytokines, such as IL-4, IL-5, IL-6, and granulocyte/macrophage-CSF, in fresh peripheral T cells.
authors.affiliation: Experimental Medicine Unit, University of Louvain, Belgium.
authors.forename: F A
authors.initials: FA
authors.lastname: Houssiau
authors.forename: J C
authors.initials: JC
authors.lastname: Renauld
authors.forename: W E
authors.initials: WE
authors.lastname: Fibbe
authors.forename: J
authors.initials: J
authors.lastname: Van Snick
mesh_terms: D000945:Antigens, Differentiation, T-Lymphocyte / Q000502:physiology; D017252:CD3 Complex; D002478:Cells, Cultured; D006801:Humans; D007376:Interleukin-2 / Q000502:physiology*; D016906:Interleukin-9 / Q000096:biosynthesis*; D015458:Leukemia, T-Cell / Q000378:metabolism; D008213:Lymphocyte Activation; D011948:Receptors, Antigen, T-Cell / Q000502:physiology; D013601:T-Lymphocytes / Q000378:metabolism*; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology
chemical_list: D000945:Antigens, Differentiation, T-Lymphocyte; D017252:CD3 Complex; D007376:Interleukin-2; D016906:Interleukin-9; D011948:Receptors, Antigen, T-Cell; D013755:Tetradecanoylphorbol Acetate