While insulin-like growth factorⅠis a well-known anabolic agent in bone evidence is beginning to accumulate that its homologue,insulin,also has some anabolic properties for bone.There is specific evidence that insuli...While insulin-like growth factorⅠis a well-known anabolic agent in bone evidence is beginning to accumulate that its homologue,insulin,also has some anabolic properties for bone.There is specific evidence that insulin may work to stimulate osteoblast differentiation,which in turn would enhance production of osteocalcin,the osteoblast-produced peptide that can stimulate pancreaticβcell proliferation and skeletal muscle insulin sensitivity.It is uncertain whether insulin stimulates bone directly or indirectly by increasing muscle work and therefore skeletal loading.We raise the question of the sequence of events that occurs with insulin resistance,such as type 2 diabetes.Evidence to date suggests that these patients have lower serum concentrations of osteocalcin,perhaps reduced skeletal loading,and reduced bone strength as evidenced by microindentation studies.展开更多
目的:观察右归丸、淫羊藿、淫羊藿苷含药血清对成骨细胞增殖及Wnt/β-catenin信号通路的作用。方法:获取新生SD乳鼠的成骨细胞,体外培养至第3代细胞,分对照组、右归丸组、淫羊藿组、淫羊藿苷组共4组,分别在含药血清培养后1、3、5、7、9...目的:观察右归丸、淫羊藿、淫羊藿苷含药血清对成骨细胞增殖及Wnt/β-catenin信号通路的作用。方法:获取新生SD乳鼠的成骨细胞,体外培养至第3代细胞,分对照组、右归丸组、淫羊藿组、淫羊藿苷组共4组,分别在含药血清培养后1、3、5、7、9d时用WST法测细胞增殖情况;培养48h后,以In-cell western blot的方法检测各组成骨细胞wnt3a、wnt7b、β-catenin蛋白的表达情况。结果:与对照组比较各组均能促进成骨细胞的增殖,右归丸组在5d、7d、9d时差异有统计学意义,淫羊藿组在7d、9d时差异有统计学意义,淫羊藿苷组在9d时差异有统计学意义(P<0.05)。与对照组比较,右归丸组能显著提高成骨细胞Wnt3a、Wnt7b、β-catenin蛋白表达,差异有统计学意义(P<0.05)。淫羊藿组及淫羊藿苷组虽能提高Wnt7b的蛋白表达,但与对照组比较,差异无统计学意义(P>0.05)。同时,淫羊藿组、淫羊藿苷与右归丸组比较,在对Wnt3a、Wnt7b、β-catenin蛋白表达的作用上比较差异均有统计学意义(P<0.05)。结论:右归丸、淫羊藿、淫羊藿苷三者均能促进体外培养的大鼠成骨细胞的增殖,以右归丸作用最显著;右归丸可显著促进wnt3a、wnt7b、β-catenin蛋白的表达。展开更多
The reinforcement of calcium phosphate materials with silk fibroin （SF） has been one of the strategies to overcome the brittleness. However, the lack of osteoinductivity may still restrict their further use. This st...The reinforcement of calcium phosphate materials with silk fibroin （SF） has been one of the strategies to overcome the brittleness. However, the lack of osteoinductivity may still restrict their further use. This study aimed to investigate the biocompatibility and osteogenesis capacity of a novel Semaphorin 3A-loaded chitosan microspheres/SF/a-tricalcium phosphate composite （Sema3A CMs/SF/a-TCP） in vitro. Sema3A was first incorporated into CMs, and the Sema3A CMs/SF/a-TCP composite was then prepared. The morphology of the CMs was observed using SEM. The in vitro release kinetics, cytotoxicity, and cell compatibility were evaluated, and the real-time quantitative polymerase chain reaction （RT-qPCR） and activity of alkaline phosphatase （ALP） were used to evaluate the osteogenesis capacity of the composite. The in vitro release of Sema3A from the Sema3A CMs/SF/a-TCP composite showed a temporally controlled manner. The extract of the Sema3A CMs/SF/a-TCP composite presented no obvious side effect on the MC3T3-E1 cell proliferation, nor promote cell proliferation. The MC3T3-E1 cells were well-spread and presented an elongated shape on the Sema3A CMs/SF/a-TCP composite surface; the ALP activity and the osteogenic-related gene expression were higher than those seeded on the surface of the CMs/SF/a-TCP and SF/a-TCP composites. In conclusion, Sema3A CMslSF/a-TCP has excellent biocompatibility and contributes to the osteoblastic differentiation of MC3T3-E1 cells.展开更多
文摘While insulin-like growth factorⅠis a well-known anabolic agent in bone evidence is beginning to accumulate that its homologue,insulin,also has some anabolic properties for bone.There is specific evidence that insulin may work to stimulate osteoblast differentiation,which in turn would enhance production of osteocalcin,the osteoblast-produced peptide that can stimulate pancreaticβcell proliferation and skeletal muscle insulin sensitivity.It is uncertain whether insulin stimulates bone directly or indirectly by increasing muscle work and therefore skeletal loading.We raise the question of the sequence of events that occurs with insulin resistance,such as type 2 diabetes.Evidence to date suggests that these patients have lower serum concentrations of osteocalcin,perhaps reduced skeletal loading,and reduced bone strength as evidenced by microindentation studies.
文摘目的:观察右归丸、淫羊藿、淫羊藿苷含药血清对成骨细胞增殖及Wnt/β-catenin信号通路的作用。方法:获取新生SD乳鼠的成骨细胞,体外培养至第3代细胞,分对照组、右归丸组、淫羊藿组、淫羊藿苷组共4组,分别在含药血清培养后1、3、5、7、9d时用WST法测细胞增殖情况;培养48h后,以In-cell western blot的方法检测各组成骨细胞wnt3a、wnt7b、β-catenin蛋白的表达情况。结果:与对照组比较各组均能促进成骨细胞的增殖,右归丸组在5d、7d、9d时差异有统计学意义,淫羊藿组在7d、9d时差异有统计学意义,淫羊藿苷组在9d时差异有统计学意义(P<0.05)。与对照组比较,右归丸组能显著提高成骨细胞Wnt3a、Wnt7b、β-catenin蛋白表达,差异有统计学意义(P<0.05)。淫羊藿组及淫羊藿苷组虽能提高Wnt7b的蛋白表达,但与对照组比较,差异无统计学意义(P>0.05)。同时,淫羊藿组、淫羊藿苷与右归丸组比较,在对Wnt3a、Wnt7b、β-catenin蛋白表达的作用上比较差异均有统计学意义(P<0.05)。结论:右归丸、淫羊藿、淫羊藿苷三者均能促进体外培养的大鼠成骨细胞的增殖,以右归丸作用最显著;右归丸可显著促进wnt3a、wnt7b、β-catenin蛋白的表达。
文摘The reinforcement of calcium phosphate materials with silk fibroin （SF） has been one of the strategies to overcome the brittleness. However, the lack of osteoinductivity may still restrict their further use. This study aimed to investigate the biocompatibility and osteogenesis capacity of a novel Semaphorin 3A-loaded chitosan microspheres/SF/a-tricalcium phosphate composite （Sema3A CMs/SF/a-TCP） in vitro. Sema3A was first incorporated into CMs, and the Sema3A CMs/SF/a-TCP composite was then prepared. The morphology of the CMs was observed using SEM. The in vitro release kinetics, cytotoxicity, and cell compatibility were evaluated, and the real-time quantitative polymerase chain reaction （RT-qPCR） and activity of alkaline phosphatase （ALP） were used to evaluate the osteogenesis capacity of the composite. The in vitro release of Sema3A from the Sema3A CMs/SF/a-TCP composite showed a temporally controlled manner. The extract of the Sema3A CMs/SF/a-TCP composite presented no obvious side effect on the MC3T3-E1 cell proliferation, nor promote cell proliferation. The MC3T3-E1 cells were well-spread and presented an elongated shape on the Sema3A CMs/SF/a-TCP composite surface; the ALP activity and the osteogenic-related gene expression were higher than those seeded on the surface of the CMs/SF/a-TCP and SF/a-TCP composites. In conclusion, Sema3A CMslSF/a-TCP has excellent biocompatibility and contributes to the osteoblastic differentiation of MC3T3-E1 cells.
