Abstract
CXC chemokines are essential for osteogenic differentiation of bone mesenchymal stem cells (BMSCs) for use in bone tissue engineering and regenerative medicine in clinical settings. However, an accurate understanding of the underlying mechanisms is still needed. In this study, we analyzed the effects of CXC chemokine ligand-13 (CXCL13) on osteogenic differentiation of rat BMSCs and initiated a preliminary discussion on possible mechanisms. BMSCs were isolated from bone marrow of rat and incubated with CXCL13 recombinant protein in differentiation medium. The main osteogenesis indexes were alkaline phosphatase (ALP) activity and calcium nodes. Expression of Runx2 and CXCR5 was determined using western blot, while miRNAs were determined with quantitative-RT-PCR. Si-CXCR5 was transfected into MSCs to silence CXCR5. A miRNA-23a mimic was transfected into BMSCs for overexpression of miRNA-23a. Recombinant CXCL13 induced ALP activity, deposition of calcium salts, and formation of calcium nodes, and it also increased expression of Runx2. The expression of recombinant CXCL13 suppressed expression of miRNA-23a. Overexpression of miR-23a reversed CXCL13 induced-osteogenic differentiation of BMSCs and expression of Runx2. Recombinant CXCL...Continue Reading
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