title: IL-1 receptor antagonist release is regulated differently in human alveolar macrophages than in monocytes.
abstract: These studies compared the release of interleukin-1 receptor antagonist (IL-1 RA) from alveolar macrophages and peripheral blood monocytes. The cells were cultured in medium containing various amounts of heat-inactivated fetal calf serum (FCS), granulocyte-macrophage colony-stimulating factor (GM-CSF), lipopolysaccharide (LPS), and immunoglobulin G (IgG). In serum-free medium alone, IL-1 RA release was similar from macrophages and monocytes. Increasing FCS concentration caused a significant upregulation of IL-1 RA release in macrophages but not in monocytes. GM-CSF caused a small increase in both cell types. LPS caused downregulation of IL-1 RA release from monocytes but not from macrophages. IgG did not affect IL-1 RA release in either cell group. These studies demonstrate that regulation of IL-1 RA release is different in monocytes and macrophages.
authors.affiliation: Department of Internal Medicine, University of Iowa College of Medicine, Iowa City 52242.
authors.forename: J N
authors.initials: JN
authors.lastname: Kline
authors.forename: M M
authors.initials: MM
authors.lastname: Monick
authors.forename: G W
authors.initials: GW
authors.lastname: Hunninghake
mesh_terms: D001345:Autoradiography; D015153:Blotting, Western; D002478:Cells, Cultured; D004591:Electrophoresis, Polyacrylamide Gel; D016178:Granulocyte-Macrophage Colony-Stimulating Factor / Q000494:pharmacology; D006801:Humans; D066298:In Vitro Techniques; D008070:Lipopolysaccharides / Q000494:pharmacology; D016676:Macrophages, Alveolar / Q000378:metabolism*; D009000:Monocytes / Q000378:metabolism*; D009504:Neutrophils / Q000187:drug effects; D017472:Receptors, Interleukin-1 / Q000037:antagonists & inhibitors*
chemical_list: D008070:Lipopolysaccharides; D017472:Receptors, Interleukin-1; D016178:Granulocyte-Macrophage Colony-Stimulating Factor