咖伦宾通过激活Wnt信号通路促进人颌骨骨髓间充质干细胞成骨分化的研究

Columbin promotes osteogenic differentiation of human jaw bone marrow mesenchymal stem cells by activating the Wnt signaling pathway

  • 摘要:
    背景 咖伦宾是从中药青牛胆中提取的一类二萜呋喃内酯型化合物,具有多种生物学活性,其对骨髓间充质干细胞成骨分化的影响尚不清楚。目的 研究咖伦宾对人颌骨骨髓间充质干细胞(human jaw bone marrow mesenchymal stem cells,h-JBMMSCs)成骨分化的影响并初步探索其分子机制。方法 通过流式细胞术及成骨、成脂向分化鉴定所提取的hJBMMSCs;将h-JBMMSCs在不同浓度(0、5、10、20、40、80 µmol/L)咖伦宾条件下进行成骨诱导。CCK-8实验检测咖伦宾对细胞增殖的影响;ALP活性检测、茜素红染色和钙离子半定量检测评估咖伦宾对h-JBMMSCs成骨分化的影响;并通过Western blot及q-PCR检测Runx2、Col1a1蛋白和mRNA的表达情况;基于转录组数据的生物信息学分析和体外实验初步探讨咖伦宾促进h-JBMMSCs成骨分化的分子机制。结果 咖伦宾浓度≤20 µmol/L时对h-JBMMSCs的增殖能力无抑制作用 (P<0.05)。与0 µmol/L组相比,5 µmol/L咖伦宾组成骨诱导后ALP活性升高(P<0.01);20 µmol/L咖伦宾组成骨诱导后茜素红红染面积及钙结节密度均升高(P<0.001)。咖伦宾成骨诱导后,成骨相关基因与蛋白 Runx2 及 Col1a1 表达量增加(P<0.05)。富集分析结果显示差异表达基因在ECM受体相互作用和P53信号通路等方面显著富集,进一步分析箱线图及体外实验发现咖伦宾诱导成骨后Wnt信号通路主要下游效应体β-catenin的mRNA和蛋白表达量增加。结论 咖伦宾浓度≤20 µmol/L时对h-JBMMSCs的成骨向分化具有一定的促进作用,可能是通过激活Wnt信号通路来实现的。

     

    Abstract: Background Columbin, a diterpenoid furanolactone-type compound isolated from the traditional Chinese herb Tinospora sagittate, exhibits diverse biological activities, and the effects of columbin on the osteogenic differentiation of bone marrow mesenchymal stem cells remain elusive.Objective To study the effect of columbin on osteogenic differentiation of human jaw bone marrow mesenchymal stem cells and explore its molecular mechanism. Methods The extracted h-JBMMSCs were identified by flow cytometry and osteogenic and lipogenic differentiation; h-JBMMSCs were subjected to osteogenic induction in the presence of columbin at concentrations of 0, 5, 10, 20, 40, and 80 μmol/L. The effect of columbin on cell proliferation was detected by CCK-8 assay; ALP activity assay, alizarin red staining and calcium ion semi-quantitative assay were used to evaluate the effect of columbin on osteogenic differentiation of h-JBMMSCs; The expression of Runx2, Col1a1 proteins and mRNA were detected by Western blot and q-PCR; Bioinformatic analysis of transcriptome data and in vitro experiments were conducted to investigate the molecular mechanism of columbin in promoting osteogenic differentiation of h-JBMMSCs. Results Columbin exhibited no inhibitory effect on the proliferation capacity of h-JBMMSCs at concentrations ≤20 µmol/L (P<0.05). Compared with the 0 µmol/L group, the ALP activity was increased in the 5 µmol/L group (P<0.01). The alizarin red staining area and the density of calcium nodules increased in 20 µmol/L columbin group (P<0.001).The expressions of osteogenesis-related genes and proteins Runx2 and Col1a1 were increased after the osteogenic induction of columbin (P<0.05).The results of enrichment analysis showed that differentially expressed genes were significantly enriched in ECM receptor interaction and P53 signaling pathway, further analysis of box plots and in vitro experiments showed that the mRNA and protein expression of β-catenin, the main downstream effector of Wnt signaling pathway, significantly increased after columbin-induced osteogenesis. Conclusion Columbin at concentrations ≤20 µmol/L exerted a promotive effect on the osteogenic differentiation of h-JBMMSCs, and this process may involve the activation of the Wnt signaling pathway.

     

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