title: [Regulation of collagen type I and fibronectin mRNA expression by mechanical stress in cultured human periodontal ligament fibroblasts].
abstract: OBJECTIVE
  To investigate the effect of different dynamic tensional and compressive stress on the mRNA expression of collagen type I and fibronectin in cultured human periodontal ligament fibroblasts (hPDLF), and explore the regularity of functional change in hPDLF.
  
  
  METHODS
  A new cyclic strain loading apparatus was used for mechanically loading. Cells cultured in vitro were loaded with three levels (1000 microstrain, 2000 microstrain, 4000 microstrain) of tensional and compressive forces and collected at different time (0 h, 0.5 h, 1 h, 4 h, 8 h,12 h) course after strain loading. The quantity of collagen type I and fibronectin mRNA was analyzed by means of quantitative real-time PCR with special primers of up- and down-regulated genes. Data were analyzed using SPSS version 10.0 software.
  
  
  RESULTS
  Different magnitude and different kinds of mechanical forces as well as the force application time significantly changed the expression of collagen type I and fibronectin mRNA in hPDLF.
  
  
  CONCLUSIONS
  Dynamic mechanical forces could regulate the expression of collagen type I and fibronectin mRNA in hPDLF. Collagen type I and fibronectin participated in the mechanical signal transduction in human periodontal ligament fibroblasts.
authors.affiliation: Department of Prosthodontics, West China School of Stomatology, Sichuan University, Chengdu 610041, China.
authors.forename: Qing-dang
authors.initials: QD
authors.lastname: Zhu
authors.forename: Yong-lie
authors.initials: YL
authors.lastname: Chao
authors.forename: Xin-min
authors.initials: XM
authors.lastname: Chen
authors.forename: Jun
authors.initials: J
authors.lastname: Hu
mesh_terms: D002478:Cells, Cultured; D024042:Collagen Type I / Q000378:metabolism*; D005347:Fibroblasts / Q000378:metabolism*; D005353:Fibronectins / Q000378:metabolism*; D006801:Humans; D010513:Periodontal Ligament / Q000166:cytology / Q000378:metabolism*; D012333:RNA, Messenger / Q000235:genetics; D013314:Stress, Mechanical
chemical_list: D024042:Collagen Type I; D005353:Fibronectins; D012333:RNA, Messenger