title: T cell induction of membrane IL 1 on macrophages.
abstract: We have studied the role of T cells in the induction of a membrane-associated form of interleukin 1 (mIL 1) in murine macrophages. T helper cell clones and a T cell hybridoma induced macrophages to express mIL 1 after an antigen-specific, Ia-restricted interaction. Induction of mIL 1 was proportional to antigen concentration and was increased in the early course of the response in macrophages pretreated in culture with interferon-gamma. mIL 1 activity was detectable 4 hr after interaction with T cells. mIL 1 induction was inhibited by antibodies to either class II molecules or the T cell receptor. Two pathways of T cell-mediated mIL 1 induction could be defined. In the first, T cells, whose protein synthesizing capacity was completely eliminated by pretreatment with the irreversible protein synthesis inhibitor emetine, induced levels of mIL 1 expression indistinguishable from controls. In the second, T cells stimulated by paraformaldehyde-fixed macrophages in the presence of concanavalin A or antigen secreted a soluble factor that induced macrophage mIL 1 expression. Thus, it appears that T cells may induce macrophages to express mIL 1 both by direct cell-cell contact mediated through binding of T cell receptor to the Ia/antigen complex, and through the release of a lymphokine after activation. This lymphokine does not appear to be IL 2, IFN-gamma, BSF-1, or CSF-1.
mesh_terms: D000818:Animals; D002450:Cell Communication; D003208:Concanavalin A / Q000494:pharmacology; D000949:Histocompatibility Antigens Class II / Q000276:immunology*; D007375:Interleukin-1 / Q000096:biosynthesis*; D007700:Kinetics; D008222:Lymphokines / Q000378:metabolism; D008264:Macrophages / Q000187:drug effects / Q000378:metabolism*; D008565:Membrane Proteins / Q000096:biosynthesis*; D051379:Mice; D008815:Mice, Inbred Strains; D014176:Protein Biosynthesis; D011948:Receptors, Antigen, T-Cell / Q000276:immunology; D006377:T-Lymphocytes, Helper-Inducer / Q000502:physiology*
chemical_list: D000949:Histocompatibility Antigens Class II; D007375:Interleukin-1; D008222:Lymphokines; D008565:Membrane Proteins; D011948:Receptors, Antigen, T-Cell; D003208:Concanavalin A