title: Induction of interleukin-3 by interleukin-1 in the absence of other exogenous stimuli.
abstract: We have previously reported that lipopolysaccharide (LPS) could induce the production of interleukin-3 (IL-3) by mouse spleen cells. In the present study, we show that recombinant human interleukin-1, in the absence of other stimuli, is able to induce the production of IL-3. IL-3 was detected in the supernatants of adult, although neither in young nor in nude mouse splenocytes and was assessed by its capacity to support the growth of the IL-3-dependent FDC-P2 cell line. The presence of IL-3 was antigenically confirmed with a monoclonal anti-IL-3 antibody. Both recombinant IL-1 alpha and IL-1 beta had similar potential for inducing IL-3 production. IL-3 activity was detected in the supernatants of cells cultured in the presence of 100 pg/ml IL-1; maximal IL-3 levels were obtained with 10-30 ng/ml IL-1. Kinetic studies of IL-1-induced IL-3 production indicated that 4-6 days of culture were required for optimal production, whereas 1-2 days were sufficient in cultures stimulated with concanavalin A. Recombinant IL-6 failed to induce significant amounts of IL-3, and TNF alpha induced only weak IL-3 production. GM-CSF but not M-CSF could lead to the appearance of IL-3 in spleen cell culture supernatants. Removal of macrophages decreased the production of IL-3 induced by LPS and GMF-CSF though did not affect the IL-3 production induced by IL-1. This observation suggests that IL-1 production might be an intermediate event in IL-3 production induced by LPS and GM-CSF through the activation of macrophages. IL-3 was detected in culture supernatants of B-cell-depleted splenocytes indicating that T-cells were the source of IL-3. Surprisingly T-cell-depleted populations could also produce IL-3 upon IL-1 stimulation. Preliminary experiments with an autoreactive CD4- CD8- V beta 8+ clone suggested that these cells might also be involved in the described IL-3 production.
authors.affiliation: Unité d'Immuno-Allergie, Institut Pasteur, Paris, France.
authors.forename: J M
authors.initials: JM
authors.lastname: Cavaillon
authors.forename: L
authors.initials: L
authors.lastname: Vidard
authors.forename: S
authors.initials: S
authors.lastname: Boudaly
authors.forename: C
authors.initials: C
authors.lastname: Fitting
authors.forename: L
authors.initials: L
authors.lastname: Cohen
authors.forename: M
authors.initials: M
authors.lastname: Seman
authors.forename: B
authors.initials: B
authors.lastname: David
mesh_terms: D000818:Animals; D001402:B-Lymphocytes / Q000378:metabolism; D002999:Clone Cells; D005260:Female; D066298:In Vitro Techniques; D007375:Interleukin-1 / Q000502:physiology*; D007377:Interleukin-3 / Q000096:biosynthesis*; D008070:Lipopolysaccharides / Q000494:pharmacology; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D008809:Mice, Inbred C3H; D008819:Mice, Nude; D011112:Polymyxin B / Q000494:pharmacology; D013154:Spleen / Q000166:cytology / Q000187:drug effects / Q000378:metabolism*; D013601:T-Lymphocytes / Q000378:metabolism
chemical_list: D007375:Interleukin-1; D007377:Interleukin-3; D008070:Lipopolysaccharides; D011112:Polymyxin B