title: Differential regulation of metalloelastase activity in murine peritoneal macrophages by granulocyte-macrophage colony-stimulating factor and macrophage colony-stimulating factor.
abstract: We investigated the regulation of elastase activity in murine peritoneal macrophages by different cytokines and bacterial LPS. Thioglycolate-elicited mouse peritoneal exudate macrophages secrete a metalloproteinase that degrades elastin. Incubation of peritoneal exudate macrophages with LPS and IFN-gamma significantly inhibited the production of elastase by a mechanism independent of nitric oxide, superoxide, and hydrogen peroxide. The cytokines IL-1alpha, IL-1beta, IL-2, IL-4, IL-6, IL-8, IL-10, TNF, TGF-alpha and -beta, basic fibroblast growth factor, monocyte chemotactic factor-1, and granulocyte CSF (G-CSF) had no significant effect on the production of elastase by macrophages. In contrast, granulocyte-macrophage CSF (GM-CSF) increased the production of elastase in a dose-dependent manner, and with macrophage CSF (M-CSF) inhibited it. Elastin zymography demonstrated that the modulation of elastolytic activity in macrophages was associated with changes in the level of metalloelastase protein. The stimulation of elastase activity by GM-CSF and the inhibition of elastase activity by LPS, IFN-gamma, and M-CSF occurred at the level of transcription. LPS and M-CSF also augmented the expression level of tissue inhibitors of metalloproteinase mRNA. The increased mRNA steady state level of murine macrophage elastase induced by GM-CSF resulted from both increased transcription and enhanced stability. The modulation of metalloelastase activity in macrophages by IFN-gamma, M-CSF, and GM-CSF suggests that these molecules may control the degradation of elastin fibers in lungs or blood vessels.
authors.affiliation: Department of Cell Biology, University of Texas M.D. Anderson Cancer Center, Houston 77030, USA.
authors.forename: R
authors.initials: R
authors.lastname: Kumar
authors.forename: Z
authors.initials: Z
authors.lastname: Dong
authors.forename: I J
authors.initials: IJ
authors.lastname: Fidler
mesh_terms: D000818:Animals; D016207:Cytokines / Q000494:pharmacology; D005260:Female; D015971:Gene Expression Regulation, Enzymologic / Q000187:drug effects; D016178:Granulocyte-Macrophage Colony-Stimulating Factor / Q000494:pharmacology*; D066298:In Vitro Techniques; D007371:Interferon-gamma / Q000494:pharmacology; D008070:Lipopolysaccharides / Q000494:pharmacology; D016173:Macrophage Colony-Stimulating Factor / Q000494:pharmacology*; D017737:Macrophages, Peritoneal / Q000187:drug effects* / Q000201:enzymology*; D053508:Matrix Metalloproteinase 12; D008666:Metalloendopeptidases / Q000096:biosynthesis / Q000235:genetics / Q000378:metabolism*; D051379:Mice; D008810:Mice, Inbred C57BL; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D011994:Recombinant Proteins; D015854:Up-Regulation / Q000187:drug effects
chemical_list: D016207:Cytokines; D008070:Lipopolysaccharides; D012333:RNA, Messenger; D011994:Recombinant Proteins; D016173:Macrophage Colony-Stimulating Factor; D007371:Interferon-gamma; D016178:Granulocyte-Macrophage Colony-Stimulating Factor; D008666:Metalloendopeptidases; D053508:Matrix Metalloproteinase 12