title: Gelatinase B/matrix metalloproteinase-9 contributes to cellular infiltration in a murine model of zymosan peritonitis.
abstract: Murine zymosan-induced peritonitis represents a well-defined model of acute inflammation. However, the molecular mechanisms by which leukocytes degrade basement membranes during extravasation into the peritoneum are not clear. Gelatinase B (MMP-9) is thought to participate in cellular migration, yet its role in leukocyte transmigration through endothelia during inflammation remains controversial. The aim of the present study was to evaluate the role of MMP-9 in the cell influx during zymosan-induced experimental peritonitis. In zymosan-treated Balb/c mice MMP-9 and its natural inhibitor (tissue inhibitor of metalloproteinase 1 - TIMP-1) were present in the peritoneal fluid and plasma at the time of peritoneal neutrophil (polymorphonuclear leukocyte - PMN) infiltration and persisted there until the time of monocytes/macrophages influx. To probe the function of gelatinases, gelatinase B-deficient mice (MMP-9(-/-)) were used as well as Balb/c mice treated with cyclic CTTHWGFTLC (INH), a specific peptide inhibitor of gelatinases. The studies revealed that in either group of mice deprived of MMP-9 activity, PMN infiltration was impaired at the time of their maximal extravasation (6h) while tumor necrosis factor alpha (TNF-alpha), cytokine-induced neutrophil chemoattractant (KC) and interleukin 10 (IL-10) levels were not changed. At later stages (24 h post-zymosan) a significant increase in PMNs was observed in MMP-9(-/-) mice, but not in the inhibitor-treated mice, in comparison to their respective controls. Moreover, intraperitoneal (i.p.) injection of recombinant mouse pro-MMP-9 induced leukocyte accumulation in peritoneum. Collectively, the findings indicate that gelatinase B participates in leukocyte transmigration; however, its function can be compensated by other mechanisms.
authors.affiliation: Department of Evolutionary Immunobiology, Institute of Zoology, Jagiellonian University, ul. Ingardena 6, PL-30-060 Krakow, Poland. kolac@zuk.iz.uj.edu.pl
authors.forename: Elzbieta
authors.initials: E
authors.lastname: Kolaczkowska
authors.forename: Magdalena
authors.initials: M
authors.lastname: Chadzinska
authors.forename: Anna
authors.initials: A
authors.lastname: Scislowska-Czarnecka
authors.forename: Barbara
authors.initials: B
authors.lastname: Plytycz
authors.forename: Ghislain
authors.initials: G
authors.lastname: Opdenakker
authors.forename: Bernd
authors.initials: B
authors.lastname: Arnold
mesh_terms: D000818:Animals; D002465:Cell Movement / Q000187:drug effects* / Q000502:physiology*; D018925:Chemokines / Q000378:metabolism; D004195:Disease Models, Animal; D004792:Enzyme Precursors / Q000008:administration & dosage / Q000235:genetics / Q000502:physiology; D008297:Male; D020780:Matrix Metalloproteinase 9 / Q000008:administration & dosage / Q000235:genetics / Q000502:physiology*; D061965:Matrix Metalloproteinase Inhibitors; D051379:Mice; D008807:Mice, Inbred BALB C; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D009504:Neutrophils / Q000201:enzymology* / Q000473:pathology*; D010538:Peritonitis / Q000139:chemically induced* / Q000201:enzymology* / Q000473:pathology; D011994:Recombinant Proteins / Q000008:administration & dosage / Q000235:genetics / Q000378:metabolism; D019715:Tissue Inhibitor of Metalloproteinase-1 / Q000378:metabolism; D015054:Zymosan / Q000633:toxicity*
chemical_list: D018925:Chemokines; D004792:Enzyme Precursors; D061965:Matrix Metalloproteinase Inhibitors; D011994:Recombinant Proteins; D019715:Tissue Inhibitor of Metalloproteinase-1; D015054:Zymosan; D020780:Matrix Metalloproteinase 9