ABSTRACT
OBJECTIVE：To investigate the effects of curcumin on bone metabolism balance in ovariectomized osteoporosis model rats ，and to investigate its potential mechanism. METHODS ：Totally female Wistar rats were randomly divided into blank group（group A ），model group （group B ），estradiol group [group C （positive control ），estradiol valerate 50 μg（/ kg·d）]， curcumin low-dose ，medium-dose and high-dose groups [group D-F ，55，110，165 μg（/ kg·d）]，with 15 rats in each group. Except for group A ，other rats were ovariectomized to establish osteoporosis model. After modeling ，group A and B were given normal saline intrgastrically ，and administration groups were given relevant medicine intrgastrically 30 mL/kg，once a day ，for consecutive 12 weeks. The contents of serum bone metabolism markers [BALP ，CBF-α1，CTX-Ⅰ，PINP and OC] were determined by ELISA. The bone mineral density （BMD）and trabecular structure indexes [relative bone volume fraction （BV/TV），trabecular number （Tb.N），trabecular thickness （Tb.Th），connectivity density （Conn. D ），trabecular separation （Tb.Sp）and structure model index （SMI）] were determined by micro CT imaging system. The mRNA and protein expression of OPG and RANKL in hypothalamus and femur were determined by RT-PCR and Western blotting assay. RESULTS ：Compared with group A ，the contents of serum bone metabolism markers ，BMD，BV/TV，Tb.N，Tb.Th，Conn.D，mRNA and protein expression of OPG were decreased significantly in group B ，while Tb.Sp ，SMI，mRNA and protein expression of RANKL were increased significantly @qq.com （P＜0.05）. Compared with group B ，the contents of serum bone metabolism markers ，BMD，BV/TV，Tb.N，Tb.Th，Conn.D，mRNA and protein expression of OPG were increased significantly in administration groups ；Tb.Sp，SMI，mRNA and protein expression of RANKL were decreased significantly ，in a dose-dependent manner among curcumin groups （P＜0.05 or P＜0.01）. CONCLUSIONS ：Curcumin can improve the level of bone metabolism，increase BMD ，improve the trabecular microstructure and inhibit bone absorption in ovariectomized osteoporosis model rats. Its mechanism may be related to the regulation of OPG/RANKL signaling pathway.
ABSTRACT
[Objective]To investigate the efficacy of treatment of C_(1～C) instability with 3D-fixation techniques.[Method]From July 2002 to July 2005,thirteen patients were treated with atlantal lateral mass screw associating with axoid pedicle screw;twelve patients were treated with axoid transarticular screw associating with posterior atlantal arch hook;sixteen patients were treated with Vertex and nine patients with Summit among them.[Result]There were 26 lateral mass screws,26 axoid transarticular screws,24 atlantoaxial transarticular screws and 24 posterior atlantal arch hooks were applied in the 25 patients.All patients were followed up.The follow up duration time was ranging from 10 to 36 months with the mean time of 16.7 months.No spinal injury and vertical artery injury was found. The postoperative JOA score was ranging from 13.6 to 15.9 with the mean score of 14.8 and the improvement rate of 89.5%.All fractures of odontoid process and all bone grafts had solid bone union.No failure and loosening of internal instrument was found.[Conclusion]The two 3D-fixation techniques are effective and reliable.