title: Up-regulated osteogenic transcription factors during early response of human periodontal ligament stem cells to cyclic tensile strain.
abstract: BACKGROUND
  As one group of periodontal ligament (PDL) cells, human periodontal ligament stem cells (hPDLSCs) have been isolated and identified as mesenchymal adult stem cells (MSCs) since 2004. It has been well accepted that PDL sensitively mediates the transmission of stress stimuli to the alveolar bone for periodontal tissue remolding. Besides, the direction of MSCs differentiation has been verified regulated by mechanical signals. Therefore, we hypothesized that tensile strain might act on hPDLSCs differentiation, and the early response to mechanical stress should be investigated.
  
  
  METHODS
  The hPDLSCs were cultured in vitro and isolated via a magnetic activated CD146 cell sorting system. After investigation of surface markers and other experiments for identification, hPDLSCs were subjected to cyclic tensile strain at 3,000 µstrain for 3 h, 6 h, 12 h, and 24 h, without addition of osteogenic supplements. In the control groups, the cells were cultured in similar conditions without mechanical stimulation. Then osteogenic related genes and proteins were analyzed by RT-PCR and western blot.
  
  
  RESULTS
  Cyclic tensile strain at 3,000 µstrain of 6 h, 12 h, and 24 h durations significantly increased mRNA and protein expressions of Satb2, Runx2, and Osx, which were not affected in unloaded hPDLSCs.
  
  
  CONCLUSIONS
  We indicate that hPDLSCs might be sensitive to cyclic tensile strain. The significant increase of Runx2, Osx and Satb2 expressions may suggest an early response toward osteogenic orientation of hPDLSCs.
authors.affiliation: State Key Laboratory of Oral Biomedical Engineering, Sichuan University, China.
authors.forename: Na
authors.initials: N
authors.lastname: Tang
authors.forename: Zhihe
authors.initials: Z
authors.lastname: Zhao
authors.forename: Linkun
authors.initials: L
authors.lastname: Zhang
authors.forename: Qiuli
authors.initials: Q
authors.lastname: Yu
authors.forename: Ji
authors.initials: J
authors.lastname: Li
authors.forename: Zhenrui
authors.initials: Z
authors.lastname: Xu
authors.forename: Xiaoyu
authors.initials: X
authors.lastname: Li