异补骨脂素对体外培养骨髓间充质干细胞增殖与成骨性分化的研究

目的:研究异补骨脂素对体外培养大鼠骨髓基质干细胞(bone marrow stromal stem cells,BMSCs)增殖与成骨性分化的影响.方法:取大鼠股骨及胫骨全骨髓,利用全骨髓贴壁培养法培养单核层细胞,培养于含10% FBS的DMEM-F12培养液中,3d后首次换液,9d后成骨性诱导培养并用药物干预.异补骨脂素在培养基中终浓度分别为1×10-4,1×10-5,1×10-6,1×10-7 mol·L-1.增殖分析采用MTT法,于成骨性诱导培养第4,8,12,16天测碱性磷酸酶(alkaline phosphatase,ALP)活性、钙盐沉积量、骨钙素分泌量,第15天进行ALP和钙化结节组织化学染色及计数.成骨性诱导后不同时间点提取总RNA,Real-time RT-PCR法检测bFGF,IGF-1,Osterix与Runx-2等成骨性相关的基因表达情况.结果:异补骨脂素剂量依赖性抑制BMSCs增殖,但能促进其成骨性分化,表现为提高BMSCs的ALP活性、促进骨钙素分泌、钙盐沉积量、增加钙化结节数量、提高bFGF,IGF-1,Osterix,Runx-2 mRNA表达水平.结论:终浓度为1×10-5 mol·L-1异补骨脂素能显著促进BMSCs的成骨性分化,证明异补骨脂素是中药补骨脂中抗骨质疏松的有效成分.

Effects of isopsoralen on bone marrow stromal stem cells differentiate and proliferate in vitro

Objective : To investigated the effects of isopsoralen on bone marrow stromal stem cells (BMSCs) differentiate and proliferate in vitro. Method : The stratum of mononuclear cells were separated and collected from the rat bone marrow sample by the all bone marrow cell culture methods. The cells were cultured in DMEM contained 10% fetal bovine serum. The culture medium was changed after three days. Nine days later, cells were treatment by isopsoralen with the concentration 1×10^-5, 1×10^-4, 1×10^-6, 1×10^-7 mol·L^-1. MTT method was used for the proliferated analyzing. Under the induced condition, the alkaline phosphatase (ALP) activity, calcium salt sediment yield and osteocalcin were measured at the 4, 8, 12, 16 d. At the fifteenth day, histochemistry dyeing for calcified tubercle and ALP was proceeded. Total RNA was isolated and the gene expression of bFGF, IGF-1, Osterix and Runx-2 were investigated by Real Time PCR. Result : The BMSCs proliferation refrained by isopsoralen with dose dependent. But it significantly enhanced osteogenesis, which was represented by the promotion of the ALP activity, calcium salt sediment yield, osteocalcin, and calcified tubercle amount. Besides, it also enhanced the mRNA level of bFGF, IGF-1, Osterix and Runx-2. Conclusion : The isopsoralen with the concentration 1×10^-5 mol·L^-1 can promote BMSCs differentiation to osteoblasts. It demonstrated the isopsoralen can prevent antiosteoporotic, which is an active part of the traditional Chinese medicine psoralea corylifolia.