1. Academic Validation
  2. Effects of cyclic fluid stress at different frequencies on behaviors of cells incubated on titanium alloy

Effects of cyclic fluid stress at different frequencies on behaviors of cells incubated on titanium alloy

  • Biochem Biophys Res Commun. 2020 Jan 29;522(1):100-106. doi: 10.1016/j.bbrc.2019.11.070.
Xing Lei 1 Hao Wu 2 Yue Song 2 Bin Liu 2 Shuai-Shuai Zhang 2 Jun-Qin Li 2 Long Bi 3 Guo-Xian Pei 4
Affiliations

Affiliations

  • 1 Department of Orthopedics, Xijing Hospital, Fourth Military Medical University, Xi'an, 710032, China; Department of Orthopedic Surgery, Linyi People's Hospital, Linyi, 276000, China.
  • 2 Department of Orthopedics, Xijing Hospital, Fourth Military Medical University, Xi'an, 710032, China.
  • 3 Department of Orthopedics, Xijing Hospital, Fourth Military Medical University, Xi'an, 710032, China. Electronic address: bilong@fmmu.edu.cn.
  • 4 Department of Orthopedics, Xijing Hospital, Fourth Military Medical University, Xi'an, 710032, China. Electronic address: nfperry@163.com.
Abstract

The orthopedic external fixation is always in dynamic mechanical environment with the somatic movement. We used a self-designed mini oscillator to simulate this condition by providing the reciprocating cyclic fluid stress, and observed the behavioral responses of fibroblasts implanted on titanium alloy plane to the stress at different frequencies, including 0.2 Hz, 0.6 Hz, and 1.0 Hz. We found that the cell angle, shape index and expression of vinculin were mostly biphasic-dependent with the increase of frequency, with peaks at 0.6 Hz. Whereas the cell area, expression of Col-I and α-SMA were mainly affected by the 1.0 Hz stress. Interestingly, 1.0 Hz stress also promoted Col-I expression of bone marrow mesenchymal stem cells (BMSCs), although it did not increase α-SMA. These results reveal that 0.6 Hz stress improves the alignment, polarity and adherence of fibroblasts on titanium alloy substrates, thus improving the sealing of implants; the 1.0 Hz force activates the differentiation of fibroblasts into myofibroblasts and increases collagen produced by stem cells, which probably cause the formation of fibrous capsules around implants.

Keywords

Alignment; BMSCs; Cyclic fluid shear stress; Differentiation; Fibroblasts; Vinculin.

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