title: [Effect of osthol on apoptosis and bone resorption of osteoclasts cultured in vitro].
abstract: This study is to investigate the effect of osthol on osteoclasts' activity, bone resorption as well as apoptosis in vitro, and explore the mechanism of osthol in preventing osteoporosis. Osteoclasts were separated from long-limb bones of new born rabbits, cultured in 24-well plate with glass slices and bone slices, and treated by 1 x 10(-5) mol x L(-1) osthol. Osteoclasts were identified by observing live cells with phase contrast microscope, HE staining, TRAP staining and toluidine blue staining of bone resorption pits. The numbers of bone resorption pits were counted as well as the surface area of bone resorption on bone slice. Osteoclasts were stained with acridine orange to detect the cell apoptosis. The ratio of apoptotic osteoclasts was observed under fluorescence microscope. The gene expression of RANKL, OPG, TRAP and p-JNK1/2 protein expression were examined using real time PCR and Western blotting, respectively. Comparing with the control group without osthol, the rates of apoptotic osteoclasts increased obviously and the number and area of bone resorption pits decreased evidently with 1 x 10(-5) mol x L(-1) osthol. There is significant difference between control group and experiment group treated by 1 x 10(-5) mol x L(-1) osthol. Therefore, the osthol through RANK+RANKL/TRAF6/Mkk/JNK signal pathway inhibits the osteoclasts activity, enhances osteoclasts apoptotic and inhibits the bone resorption.
authors.affiliation: College of Life Science and Engineering, Lanzhou University of Technology, Lanzhou, China.
authors.forename: Lei-Guo
authors.initials: LG
authors.lastname: Ming
authors.forename: Ming-Gang
authors.initials: MG
authors.lastname: Wang
authors.forename: Ke-Ming
authors.initials: KM
authors.lastname: Chen
authors.forename: Jian
authors.initials: J
authors.lastname: Zhou
authors.forename: Gui-Qiu
authors.initials: GQ
authors.lastname: Han
authors.forename: Rui-Qing
authors.initials: RQ
authors.lastname: Zhu
mesh_terms: D000135:Acid Phosphatase / Q000378:metabolism; D000818:Animals; D017209:Apoptosis / Q000187:drug effects*; D001862:Bone Resorption; D002478:Cells, Cultured; D031048:Cnidium / Q000737:chemistry; D003374:Coumarins / Q000302:isolation & purification / Q000494:pharmacology*; D015870:Gene Expression; D007527:Isoenzymes / Q000378:metabolism; D048055:Mitogen-Activated Protein Kinase 8 / Q000378:metabolism; D048056:Mitogen-Activated Protein Kinase 9 / Q000378:metabolism; D010010:Osteoclasts / Q000378:metabolism / Q000473:pathology*; D053244:Osteoprotegerin / Q000378:metabolism; D010766:Phosphorylation; D010946:Plants, Medicinal / Q000737:chemistry; D053245:RANK Ligand / Q000378:metabolism; D011817:Rabbits; D012639:Seeds / Q000737:chemistry; D015398:Signal Transduction; D000071681:Tartrate-Resistant Acid Phosphatase
chemical_list: D003374:Coumarins; D007527:Isoenzymes; D053244:Osteoprotegerin; D053245:RANK Ligand; D048056:Mitogen-Activated Protein Kinase 9; D048055:Mitogen-Activated Protein Kinase 8; D000135:Acid Phosphatase; D000071681:Tartrate-Resistant Acid Phosphatase; C046627:osthol