title: Regulatory mechanisms for the expression of type IV collagenases/gelatinases in murine macrophages.
abstract: The purpose of this study was to determine the regulation of type IV collagenase expression in murine peritoneal macrophages (PEM) after they are incubated with LPS. LPS stimulated the production of the latent forms of 92-kDa (MMP-9) and 72-kDa (MMP-2) type IV gelatinases in a dose-dependent (> 10 ng/ml) and serum-dependent manner. Time course analyses revealed that LPS regulated the expression of MMP-9 and MMP-2 via discordant kinetics. Prolonged treatment of PEM with LPS decreased MMP-9 but not MMP-2 activities. IFN-gamma decreased the production of both gelatinases by PEM responding to LPS. TGF-beta stimulated production of both matrix metalloproteinases but blocked the LPS-mediated secretion of MMP-9. LPS-stimulated MMP-9 production was suppressed by genistein and tyrphostin, two specific tyrosine kinase inhibitors, as well as H-7, a serine/threonine protein kinase inhibitor, but not by HA1004, a relatively selective inhibitor for PKA and PKG. Our data demonstrate that the secretion of MMP-2 and MMP-9 by murine PEM is differentially regulated, suggesting a distinct in vivo role for these two otherwise analogous type IV gelatinases in macrophage-mediated connective tissue destruction at sites of immunologic challenges.
authors.affiliation: Department of Cell Biology, University of Texas M. D. Anderson Cancer Center, Houston 77030.
authors.forename: B
authors.initials: B
authors.lastname: Xie
authors.forename: Z
authors.initials: Z
authors.lastname: Dong
authors.forename: I J
authors.initials: IJ
authors.lastname: Fidler
mesh_terms: D000818:Animals; D017364:Collagenases / Q000378:metabolism*; D005260:Female; D018093:Gelatinases / Q000378:metabolism*; D007371:Interferon-gamma / Q000494:pharmacology; D008070:Lipopolysaccharides / Q000494:pharmacology; D017737:Macrophages, Peritoneal / Q000201:enzymology*; D020778:Matrix Metalloproteinase 2; D020780:Matrix Metalloproteinase 9; D008666:Metalloendopeptidases / Q000378:metabolism*; D051379:Mice; D008810:Mice, Inbred C57BL; D011493:Protein Kinase C / Q000502:physiology; D017346:Protein Serine-Threonine Kinases / Q000037:antagonists & inhibitors; D011505:Protein-Tyrosine Kinases / Q000037:antagonists & inhibitors; D011994:Recombinant Proteins; D015398:Signal Transduction; D016212:Transforming Growth Factor beta / Q000494:pharmacology
chemical_list: D008070:Lipopolysaccharides; D011994:Recombinant Proteins; D016212:Transforming Growth Factor beta; D007371:Interferon-gamma; D011505:Protein-Tyrosine Kinases; D017346:Protein Serine-Threonine Kinases; D011493:Protein Kinase C; D017364:Collagenases; D018093:Gelatinases; D008666:Metalloendopeptidases; D020778:Matrix Metalloproteinase 2; D020780:Matrix Metalloproteinase 9