目的 探讨β-catenin对人牙周膜干细胞应力下成骨的影响。方法 体外分离培养人牙周膜干细胞,以β-catenin为靶点的激动剂和抑制剂上调或下调其β-catenin蛋白的表达,用Western blot检测不同时段（0、6、12、24 h）的应力作用下,激动剂或抑制剂处理后PDLSCs中β-catenin的表达水平及相关成骨标志物ALP、BMP2、Runx2的表达。结果 在外源性张应力作用下,成骨相关标志物ALP、Runx2较无张力组的表达水平增加（P〈0.05）;β-catenin激动剂WAY-262611作用后的PDLSCs,在外源性张应力条件下,成骨相关标物ALP的表达在加力0~12 h时段较DMSO加力组（对照组）明显增强（P〈0.05）。结论 Wnt/β-catenin信号通路参与了PDLSCs早期的应力条件下成骨。
Objective To investigate the effect of β-catenin on the osteogenic differentiation of human periodontal ligament stem cells （PDLSCs） under mechanical tension. Methods PDLSCs were seperately euhured in vitro from the periodontium attached at freshly extracted teeth. β-catenin-targeting agonist or inhibitor was applied to the PDLSCs to upregulate or downregulate the expression of activity of β-catenin protein. The expression of β-catenin protein and the osteogenetic related markers （ALP, BMP2, Runx 2） under the mechanical tension with different period（0,6,12,24 h） were assessed with Western blot in the PDLSCs irritated with agonist or inhibitor. Results Compared with the PDLSCs without mechanical tension, the expression of osteogenesis related marker proteins, ALP and Runx 2, in PDLSCs were enhanced under the circular mechanial tensile stress （ P 〈 0.05 ）. In the PDLSCs irritated with WAY-262611, the 13-catenin-targeting agonist, the expression of osteogenetic related markers ALP in the PDLSCs was improved during the first 12 h period of mechnical tensile load, which was significantly higher than that in the DMSO group. Conclusion Wnt/β-catenin signaling pathway plays an important role in the early osteogenesis differentiation of PDLSCs under cyclic tension. The β-catenin promotes osteogenic differentiation of PDLSCs under mechanical tension.
Journal of Regional Anatomy and Operative Surgery