title: Morphologic evaluation and expression of matrix metalloproteinases-2 and 9 and nitric oxide during experimental periodontal disease in rat.
abstract: The immunopathologic and inflammatory mechanisms involved in periodontal disease (PD) include the participation of host resident, inflammatory cells and chemical mediators. Metalloproteinases (MMPs) and nitric oxide (NO) play essential role in extracellular matrix turnover of periodontal tissue destruction. In this study, by means of RT-PCR through semi-quantitative densitometric scanning methods, the expression of MMPs -2 and -9 and inducible NO synthase (iNOS) was temporally and spatially investigated during the destructive mechanisms of experimentally induced PD in rats. Samples from different periods were microscopically analyzed and compared with the contralateral side (control). Our results showed significant expression of MMP-9 and iNOS in tissues affected by PD, as compared with controls, three days after PD induction, simultaneously with the beginning of alveolar bone loss. At 7 days post induction, only the MMP-9 mRNA presented a significantly higher expression, as compared with the respective controls. Thus, in the rat ligature-induced PD, MMP-9 and iNOS might importantly participate in the early stages of the disease, including inflammatory cell migration, tissue destruction and alveolar bone resorption. Also, we may suggest that the exuberant presence of PMNs may be related to the important expression of iNOS and MMP-9 found at 3 days post induction.
authors.affiliation: Department of Stomatology Oral Pathology, Bauru School of Dentistry, University of São Paulo, Sao Paulo, Brazil. carodini@usp.br
authors.forename: Camila Oliveira
authors.initials: CO
authors.lastname: Rodini
authors.forename: Aline Carvalho
authors.initials: AC
authors.lastname: Batista
authors.forename: Thiago José
authors.initials: TJ
authors.lastname: Dionísio
authors.forename: Carlos Ferreira
authors.initials: CF
authors.lastname: Santos
authors.forename: Fernando Queiroz
authors.initials: FQ
authors.lastname: Cunha
authors.forename: Vanessa Soares
authors.initials: VS
authors.lastname: Lara
mesh_terms: D000818:Animals; D004195:Disease Models, Animal; D015971:Gene Expression Regulation, Enzymologic; D008297:Male; D020778:Matrix Metalloproteinase 2 / Q000235:genetics / Q000378:metabolism*; D020780:Matrix Metalloproteinase 9 / Q000235:genetics / Q000378:metabolism*; D009569:Nitric Oxide / Q000378:metabolism*; D052247:Nitric Oxide Synthase Type II / Q000235:genetics / Q000378:metabolism; D010510:Periodontal Diseases / Q000201:enzymology* / Q000473:pathology; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D051381:Rats; D017208:Rats, Wistar
chemical_list: D012333:RNA, Messenger; D009569:Nitric Oxide; D052247:Nitric Oxide Synthase Type II; D020778:Matrix Metalloproteinase 2; D020780:Matrix Metalloproteinase 9