title: IL-10 inhibits IL-7-mediated murine pre-B cell growth in vitro.
abstract: B lymphopoiesis in the bone marrow is mediated by both positive and negative regulatory cytokines. In this report, we demonstrate that interleukin-10 (IL-10) may function to inhibit murine IL-7-dependent pre-B cell growth. Recombinant IL-10 (rmIL-10) inhibited BALB/c bone marrow IL-7 colony-forming unit (CFU) in a concentration-dependent manner, and growth was restored when IL-10 was neutralized with the monoclonal anti-IL-10 antibody, SXC-1. Enriched populations of B220+ bone marrow B lineage cells were also inhibited in their responses to IL-7 by exposure to rmIL-10, suggesting that pre-B cells were directly susceptible to rmIL-10 inhibition. Heterogeneity in the capacity of IL-7 CFU to be inhibited by IL-10 was evident. Although 60% of IL-7 CFU were inhibited by rmIL-10 at 5 U/mL, approximately 20% of IL-7 CFU were not inhibited by rmIL-10 concentrations up to 50 U/mL. Prior incubation of bone marrow cells for 24 hours with IL-7 prevented rmIL-10-mediated growth inhibition, suggesting that prior rIL-7 stimulation of pre-B cells abrogates the inhibitory effects of rmIL-10. These experiments indicate that IL-10, at these concentrations, may function as a potent negative growth regulator for a significant fraction of IL-7-responsive pre-B cells.
authors.affiliation: Department of Microbiology and Immunology, University of Miami School of Medicine, FL 33101.
authors.forename: J M
authors.initials: JM
authors.lastname: Elia
authors.forename: B L
authors.initials: BL
authors.lastname: Hamilton
authors.forename: R L
authors.initials: RL
authors.lastname: Riley
mesh_terms: D000818:Animals; D000954:Antigens, Surface / Q000235:genetics; D001402:B-Lymphocytes / Q000166:cytology* / Q000187:drug effects; D001854:Bone Marrow Cells; D002455:Cell Division / Q000187:drug effects; D002469:Cell Separation; D005260:Female; D006410:Hematopoiesis / Q000187:drug effects; D006412:Hematopoietic Stem Cells / Q000166:cytology / Q000187:drug effects; D016753:Interleukin-10 / Q000494:pharmacology*; D015851:Interleukin-7 / Q000037:antagonists & inhibitors*; D017493:Leukocyte Common Antigens; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D011994:Recombinant Proteins
chemical_list: D000954:Antigens, Surface; D015851:Interleukin-7; D011994:Recombinant Proteins; D016753:Interleukin-10; D017493:Leukocyte Common Antigens