Objective：The study was designed to investigate the molecular mechanism of quercitrin on osteogenic differentiation and adipogenic differentiation of r BMSCs.Methods：r BMSCs were harvested from SD rats,and determina...Objective：The study was designed to investigate the molecular mechanism of quercitrin on osteogenic differentiation and adipogenic differentiation of r BMSCs.Methods：r BMSCs were harvested from SD rats,and determination of alkaline phosphatase（ALP）activity,quantification of mineralization by Alizarin Red S staining,and the m RNA expression of osteogenic differentiation markers（Runx2,BMP-2,and OSX）by RT-PCR after r BMSCs stimulated by osteogenic induction with（0.1–10）μg/m L of quercitrin,quantification of Lipid droplet by Oil Red O staining and the m RNA expression of adipogenic differentiation marker（,and a P2）by RT-PCR after r BMSCs stimulated by adipogenic induction with（0.1-10）μg/m L of quercitrin.Results：Quercitrin can up-regulate the m RNA expression of osteogenic differentiation markers（Runx2,BMP-2,and OSX）and increase ALP activity and mineralization after osteogenic induction,on the other hand quercitrin can suppress the m RNA expression of adipogenic differentiation markers（,and a P2）and decrease lipid droplet after adipogenic induction.Conclusion：This study suggested that quercitrin not only stimulated osteogenic differentiation but also inhibited adipogenic differentiation of r BMSCs,which was associated with the up-regulation of Runx2,BMP-2,and OSX m RNA expression and the down-regulation of,and a P2 m RNA expression.展开更多
Exogenic electric fields can effectively accelerate bone healing and remodeling through the enhanced migration of bone marrow mesenchymal stem cells （BMSCs） toward the injured area. This study aimed to determine the...Exogenic electric fields can effectively accelerate bone healing and remodeling through the enhanced migration of bone marrow mesenchymal stem cells （BMSCs） toward the injured area. This study aimed to determine the following： （1） the direction of rat BMSC （rBMSC） migration upon exposure to a direct current electric field （DCEF）, （2） the optimal DCEF intensity and duration, and （3） the possible regulatory role of SDF-1/ CXCR4 axis in rBMSC migration as induced by DCEF. Results showed that rBMSCs migrated to the positive electrode of the DCEF, and that the DCEF of 200 mV/mm for 4 h was found to be optimal in enhancing rBMSC migration. This DCEF strength and duration also upregulated the expression of osteoblastic genes, including ALP and OCN, and upregulated the expression of ALP and Runx2 proteins. Moreover, when CXCR4 was inhibited, rBMSC migration due to DCEF was partially blocked. These findings indicated that DCEF can effectively induce rBMSC migration. A DCEF of 200 mV/mm for 4 h was recommended because of its ability to promote rBMSC migration, proliferation, and osteogenic differentiation. The SDF-1/CXCR4 signaling pathway may play an important role in regulating the DCEF-induced migration of rBMSCs.展开更多
基金supported by National Natural Science Foundation of China(No.81160508)The Science and Technology Landing Program Project of Colleges and University in Jiangxi Province(KJLD14058)
文摘Objective：The study was designed to investigate the molecular mechanism of quercitrin on osteogenic differentiation and adipogenic differentiation of r BMSCs.Methods：r BMSCs were harvested from SD rats,and determination of alkaline phosphatase（ALP）activity,quantification of mineralization by Alizarin Red S staining,and the m RNA expression of osteogenic differentiation markers（Runx2,BMP-2,and OSX）by RT-PCR after r BMSCs stimulated by osteogenic induction with（0.1–10）μg/m L of quercitrin,quantification of Lipid droplet by Oil Red O staining and the m RNA expression of adipogenic differentiation marker（,and a P2）by RT-PCR after r BMSCs stimulated by adipogenic induction with（0.1-10）μg/m L of quercitrin.Results：Quercitrin can up-regulate the m RNA expression of osteogenic differentiation markers（Runx2,BMP-2,and OSX）and increase ALP activity and mineralization after osteogenic induction,on the other hand quercitrin can suppress the m RNA expression of adipogenic differentiation markers（,and a P2）and decrease lipid droplet after adipogenic induction.Conclusion：This study suggested that quercitrin not only stimulated osteogenic differentiation but also inhibited adipogenic differentiation of r BMSCs,which was associated with the up-regulation of Runx2,BMP-2,and OSX m RNA expression and the down-regulation of,and a P2 m RNA expression.
基金This study was supported by the Chinese Army Five-Year Project Funding （CWS 12J134） and the National Natural Science Foundation of China （No. 51473175）. We appreciate the Chinese Academy of Agricultural Sciences and the Institute of Orthopedics for their assistance for our experiments.
文摘Exogenic electric fields can effectively accelerate bone healing and remodeling through the enhanced migration of bone marrow mesenchymal stem cells （BMSCs） toward the injured area. This study aimed to determine the following： （1） the direction of rat BMSC （rBMSC） migration upon exposure to a direct current electric field （DCEF）, （2） the optimal DCEF intensity and duration, and （3） the possible regulatory role of SDF-1/ CXCR4 axis in rBMSC migration as induced by DCEF. Results showed that rBMSCs migrated to the positive electrode of the DCEF, and that the DCEF of 200 mV/mm for 4 h was found to be optimal in enhancing rBMSC migration. This DCEF strength and duration also upregulated the expression of osteoblastic genes, including ALP and OCN, and upregulated the expression of ALP and Runx2 proteins. Moreover, when CXCR4 was inhibited, rBMSC migration due to DCEF was partially blocked. These findings indicated that DCEF can effectively induce rBMSC migration. A DCEF of 200 mV/mm for 4 h was recommended because of its ability to promote rBMSC migration, proliferation, and osteogenic differentiation. The SDF-1/CXCR4 signaling pathway may play an important role in regulating the DCEF-induced migration of rBMSCs.
