淫羊藿素通过CXCR4/SDF-1信号通路促进小鼠成骨细胞成熟和矿化

摘要

Objective: To investigate the effect of icaritin on maturation and mineralization of mouse osteoblast MC3T3-E1 cells and its mechanism. Methods: The cultured MC3T3-E1 cells were divided into blank control group, CXC chemokine receptor type 4 (CXCR4) inhibitor (AMD3100) group, icaritin group, and icaritin plus AMD3100 group. The expression of CXCR4, stromal cell-derived factor 1 (SDF-1) and osteogenesis-related genes and proteins were detected by real-time RT-PCR and Western blotting after drug treatment for 24 h. The alkaline phosphatase(ALP) activity was determined with ALP kit on d3 and d6; calcium nodules were detected by alizarin red staining after drug treatment for 14 d. Results: Real time RT-PCR showed that compared with the blank control group, relative expressions of CXCR4, SDF-1 and osteogenesis-related genes in icaritin group were significantly increased(P<0.05 or P<0.01);After AMD3100 treatment,the relative expression of CXCR4 gene was decreased (P<0.05). Western blot showed that compared with the blank control group, relative expressions of CXCR4,SDF-1 and osteogenesis-related proteins in the icaritin group were significantly increased (all P <0.01), but were decreased after AMD3100 was added (all P<0.01). The ALP activity of icaritin group was significantly higher than that of blank control group (all P<0.01) on d3 and d6 after drug treatment,while the activity of ALP was significantly decreased after AMD3100 treatment(all P<0.01). At d14 after drug treatment,compared with the blank control group,the area of alizarin red staining was increased in the icaritin group,while it was significantly reduced after the addition of AMD3100. Conclusion: Icaritin may promote maturation and mineralization of mouse osteoblast MC3T3-E1 cells through CXCR4/SDF-1 signaling pathway.%目的:研究淫羊藿素是否通过CXC趋化因子受体4(CXCR4)/基质细胞衍生因子1(SDF-1)信号通路促进小鼠成骨细胞MC3T3-E1成熟和矿化.方法:将体外培养的MC3T3-E1细胞分为空白对照组、AMD3100组、淫羊藿素组、淫羊藿素加AMD3100组.药物处理24 h时,采用实时定量RT-PCR和蛋白质印迹法检测CXCR4、SDF-1和成骨相关基因和蛋白的表达;药物处理3、6 d时,采用碱性磷酸酶(ALP)试剂盒检测ALP的活性;药物处理14 d时,采用茜素红染色法检测钙化结节.结果:实时定量RT-PCR检测结果显示,与空白对照组比较,淫羊藿素组CXCR4、SDF-1、Runx2和 OPG 基因表达量增加(P <0.05或 P <0.01),而加入CXCR4拮抗剂AMD3100后,CXCR4基因相对表达量减少(P<0.05).蛋白质印迹法检测结果显示,与空白对照组比较,淫羊藿素组CXCR4、SDF-1、Runx2和OPG蛋白的相对表达量增加(均P<0.01),而加入AMD3100后,CXCR4、SDF-1、Runx2和OPG蛋白表达量减少(均P<0.01).药物处理第3天和第6天时,淫羊藿素组ALP活性明显高于空白对照组(均P<0.01),而加入AMD3100后ALP活性显著降低(均P<0.01).药物处理14 d时,与空白对照组比较,淫羊藿素组茜素红染色面积增加,而加入AMD3100后茜素红染色面积明显减少.结论:淫羊藿素可能通过CXCR4/SDF-1信号通路促进小鼠成骨细胞成熟及矿化.