摘要
目的 探究红景天苷(Sal)调节骨保护素(osteoprotegerin,OPG)/核因子κB受体激活剂配体(receptor activator of nuclear factorKB ligand,RANKL)通路对阻塞性睡眠呼吸暂停综合征(OSAS)大鼠骨质流失的影响.方法 将大鼠随机分为control组、OSAS组、Sal-L、Sal-M、Sal-H组(分别灌胃Sal 17.5、35、70 mg/kg),每组12只.除control组,其余组均采用缺氧和复氧循环复制OSAS大鼠模型.分别利用骨密度仪、三点弯曲实验、Micro CT测定大鼠股骨骨密度、生物力学及微结构变化;ELISA法检测血清骨钙素(osteocalcin,BGP)、碱性磷酸酶(alkaline phosphatase,ALP)、Ⅰ型胶原交联C-末端肽(cross linked C-telopeptide of type Ⅰ collagen,CTX-I)水平;RT-PCR检测股骨中OPG、RANKL mRNA水平;Western blot检测股骨OPG/RANKL通路蛋白表达.结果 与control组比较,OSAS组大鼠骨密度、最大强度、最大负荷、骨小梁骨体积分数(Tb.BV/TV)、骨小梁数(Tb.N)、骨小梁厚度(Tb.Th)、BGP、ALP、OPG mRNA及蛋白表达、OPG/RANKL比值降低,CTX-I、RANKL mRNA及蛋白表达升高(P<0.05);与OSAS组比较,Sal-L、Sal-M、Sal-H组大鼠骨密度、最大强度、最大负荷、Tb.BV/TV、Tb.N、Tb.Th以及BGP、ALP、OPG mRNA和蛋白表达、OPG/RANKL比值依次升高,CTX-I、RANKL mRNA及蛋白表达依次降低,其中Sal-H组上述变化最为显著(P<0.05).结论 Sal通过升高OPG表达,降低RANKL表达,促进骨形成,抑制骨吸收,从而减少OSAS大鼠骨质流失.
Abstract
OBJECTIVE To investigate the effect of salidroside (Sal) on bone loss in obstructive sleep apnea syndrome(OSAS) rats by regulating the osteoprotegerin(OPG)/receptor activator of nuclear factor kappa-B ligand(RANKL) pathway. METHODS Rats were randomly divided into(12 rats/group) control group,OSAS group,Sal-L,Sal-M,and Sal-H groups(17.5,35,70 mg/kg). Except for the control group,all other groups were used to replicate the OSAS rat model through hypoxia and reoxygenation cycles. Bone density meters,three-point bending experiments,and Micro CT were applied to measure the bone density,biomechanics,and microstructural changes of the femur in rats. ELISA method was applied to detect serum levels of osteocalcin(BGP),alkaline phosphatase(ALP),and cross-linked carboxy-terminal telopeptide of type Ⅰ collagen(CTX-I). RT-PCR was applied to detect OPG and RANKL mRNA levels in the femur. Western blotting was applied to detect the expression of OPG/RANKL pathway proteins in the femur. RESULTS Compared with the control group,the bone density,maximum intensity,maximum load,trabecular bone volume fraction(Tb.BV/TV),trabecular number(Tb.N),trabecular thickness(Tb.Th),BGP,ALP,OPG mRNA and protein expression,OPG/RANKL ratio of rats in the OSAS group were decreased,the mRNA and protein expression of CTX-I and RANKL were increased(P<0.05). Compared with the OSAS group,the bone density,maximum intensity,maximum load,Tb.BV/TV,Tb.N,Tb.Th,BGP,ALP,OPG mRNA and protein expression,OPG/RANKL ratio of rats in the Sal-L,Sal-M,and Sal-H groups were increased sequentially,the mRNA and protein expression of CTX-I and RANKL were decreased sequentially,the above changes were most great in the Sal-H group(P<0.05). CONCLUSION Salidroside promotes bone formation and inhibits bone resorption by increasing OPG expression and decreasing RANKL expression,thereby reducing bone loss in OSAS rats.
维普
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