title: Matrix metalloproteinase 2 activity decreases in human periodontal ligament fibroblast cultures submitted to simulated orthodontic force.
abstract: Orthodontic force compresses the periodontal ligament promoting the expression of pro-inflammatory mediators and matrix metalloproteinases responsible for tooth movement. The extent in time while periodontal cells are being treated and the increment in the amount of mechanical stress caused by the orthodontic force is thought to regulate the levels of metalloproteinases in the periodontal tissue. To study the possible regulation in the activity of metalloproteinases 2, 3, 7, 9, and 10 by simulated orthodontic force, human periodontal ligament fibroblast cultures were centrifuged (141 × g) for 30, 60, 90, and 120 min, simulating the orthodontic force. Cell viability, protein quantification, and activity of metalloproteinases by zymography were evaluated at 24, 48, and 72 h after centrifugation in both cell lysates and growth medium. The activity of the 72-kDa matrix metalloproteinase 2 was decreased at 24 h regardless of the duration of centrifugation and at 48 h in cells centrifuged for 30 min only. Decrease in the amount of total protein in lysates was seen at 48 and 72 h with no change in cell viability. The data seem to indicate that the amount of mechanical stress regulates the levels of secreted matrix metalloproteinase 2. In addition, the centrifugation as a model for simulated orthodontic force may be used as a simple and reliable method to study the role played by matrix metalloproteinases in periodontal ligament when submitted to mechanical force as occurring during tooth movement.
authors.affiliation: Department of Pathology, School of Medicine, Federal University of Minas Gerais (UFMG), Belo Horizonte, MG, Brazil.
authors.forename: Rodolfo Assis
authors.initials: RA
authors.lastname: Lisboa
authors.forename: Felipe Assis
authors.initials: FA
authors.lastname: Lisboa
authors.forename: Guilherme
authors.initials: G
authors.lastname: de Castro Santos
authors.forename: Marcus Vinícius Melo
authors.initials: MV
authors.lastname: Andrade
authors.forename: José Renan
authors.initials: JR
authors.lastname: Cunha-Melo
mesh_terms: D001696:Biomechanical Phenomena; D001732:Bite Force; D018929:Cell Culture Techniques; D002465:Cell Movement; D006801:Humans; D053506:Matrix Metalloproteinase 10 / Q000378:metabolism; D020778:Matrix Metalloproteinase 2 / Q000378:metabolism*; D019278:Matrix Metalloproteinase 3 / Q000378:metabolism; D020783:Matrix Metalloproteinase 7 / Q000378:metabolism; D020780:Matrix Metalloproteinase 9 / Q000378:metabolism; D010513:Periodontal Ligament / Q000166:cytology / Q000378:metabolism*; D013314:Stress, Mechanical
chemical_list: D019278:Matrix Metalloproteinase 3; D053506:Matrix Metalloproteinase 10; C060932:MMP7 protein, human; D020783:Matrix Metalloproteinase 7; C522361:MMP2 protein, human; D020778:Matrix Metalloproteinase 2; D020780:Matrix Metalloproteinase 9