Journal
CONNECTIVE TISSUE RESEARCH
Volume 60, Issue 6, Pages 544-554Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/03008207.2019.1601185
Keywords
Bone mesenchymal stem cells (BMSCs); cyclic mechanical stretch; osteogenic differentiation; HIF-1 alpha-TWIST pathway
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Funding
- National Nature Science Foundation of China [11602122]
- China Postdoctoral Science Foundation [2017M623396]
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Aim: Mechanical strain plays a crucial role in bone formation and remodeling. Hypoxia-inducible factor (HIF)-1 alpha and TWIST are upstream of master regulators of osteogenesis, including runt-related transcription factor 2 (RUNX2) and bone morphogenetic proteins (BMPs). This study investigated the effect of the HIF-1 alpha-TWIST pathway on cyclic mechanical stretch-induced osteogenic differentiation of rat bone marrow mesenchymal stem cells (BMSCs) and the underlying mechanism. Materials and Methods: BMSCs were isolated from bone marrow derived from the femurs and humeri of Sprague-Dawley rats. Osteogenic differentiation of BMSCs was induced by applying cyclic mechanical stretch using the Flexcell Tension System. HIF-1 alpha and TWIST were knocked down using recombinant lentiviral vectors. Osteogenic differentiation was evaluated by real-time qPCR, western blotting, and the alkaline phosphatase (ALP) activity assay. Results: Cyclic mechanical stretch increased ALP activity and expression of HIF-1 alpha and TWIST in BMSCs. Knockdown of HIF-1 alpha decreased TWIST expression in stretched BMSCs. Moreover, knockdown of HIF-1 alpha or TWIST enhanced cyclic mechanical stretch-induced osteogenic differentiation of BMSCs. In addition, knockdown of TWIST increased expression of RUNX2 and BMP2 in stretched BMSCs. Conclusions: The HIF-1 alpha-TWIST signaling pathway inhibits cyclic mechanical stretch-induced osteogenic differentiation of BMSCs. This finding may facilitate cell and tissue engineering for clinical applications.
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