title: Reduced secretion and expression of gelatinase profile in Toxoplasma gondii-infected human monocytic cells.
abstract: The apicomplexan Toxoplasma gondii, an obligate intracellular parasite, can infect humans and a wide range of vertebrates. Following oral infection, the parasite invades tissues by crossing non-permissive biological barriers such as the placenta or the blood-brain barrier. But the molecular mechanisms underlying migration of T. gondii remain poorly characterized. The crossing of various basal membranes and infiltration into the extracellular matrix by T. gondii could involve matrix metalloproteinases (MMPs). We demonstrated a decrease in proMMP-2 and proMMP-9 secretion by THP-1 cells at 24 and 48h post invasion with regulation at the mRNA level throughout infection. This down regulation was associated with a decrease in TIMP-2 secretion and an inhibition of its expression. Moreover, results showed an activation of MT1-MMP; its expression was regulated after 6, 24, and 48h.
authors.affiliation: Laboratoire de Biochimie et Biologie Moléculaire, CNRS UMR 6198, IFR 53, UFR Médecine, Université de Reims Champagne-Ardenne, 51 rue Cognacq-Jay, 51095 Reims cedex, France.
authors.forename: Emilie
authors.initials: E
authors.lastname: Buache
authors.forename: Roselyne
authors.initials: R
authors.lastname: Garnotel
authors.forename: Dominique
authors.initials: D
authors.lastname: Aubert
authors.forename: Philippe
authors.initials: P
authors.lastname: Gillery
authors.forename: Isabelle
authors.initials: I
authors.lastname: Villena
mesh_terms: D000818:Animals; D002460:Cell Line; D002470:Cell Survival; D005260:Female; D018093:Gelatinases / Q000096:biosynthesis*; D005786:Gene Expression Regulation; D006801:Humans; D053511:Matrix Metalloproteinase 14 / Q000378:metabolism; D020778:Matrix Metalloproteinase 2 / Q000378:metabolism; D020780:Matrix Metalloproteinase 9 / Q000378:metabolism; D051379:Mice; D009000:Monocytes / Q000378:metabolism / Q000469:parasitology*; D013997:Time Factors; D019716:Tissue Inhibitor of Metalloproteinase-2 / Q000378:metabolism; D014122:Toxoplasma / Q000378:metabolism*
chemical_list: D019716:Tissue Inhibitor of Metalloproteinase-2; D018093:Gelatinases; D020778:Matrix Metalloproteinase 2; D020780:Matrix Metalloproteinase 9; D053511:Matrix Metalloproteinase 14