比较雷奈酸锶与甲状旁腺激素（1-34）对卵巢切除大鼠骨质量的影响

摘要

OBJECTIVE:To compare the effects of strontium ranelate and PTH(1-34)on bone quality of ovariectomized rats. METHODS:80 SD rats were randomly divided into sham operation group(group A,n=10)and dual ovariectomy(group B,n=70). 3 months after operation,group B were randomly divided into 7 groups,with 10 rats in each group. B0 group were given nor-mal saline [0.9 g/(kg·d)] subcutaneously;B1-B3 groups were given low-dose,medium-dose and high-dose of strontium ranelate [0.45,0.9,1.35 g/(kg·d)] intragastrically;B4-B6 groups were given low-dose,medium-dose and high-dose of PTH(1-34)[30, 60,90 μg/(kg·d),treated for 5 days,rested for 2 days] subcutaneously. Group A was same to group B0 in therapy regimen. All rats were sacrificed 8 weeks later. The contents of P1NP and CTX-1 in serum of rats were determined by ELISA assay;bone densi-ty of 4th lumbar vertebrae was detected by bone densitometer;BV/TV,Tb.Th,Tb.N and Tb.Sp were detected by CT;maximal load and elastic modulus of 5th lumbar vertebrae were measured by compression test. RESULTS:Compared with group A,the se-rum levels of P1NP and CTX-1 in B0-B6 groups increased significantly,while bone density of 4th lumbar vertebrae,maximal load and elastic modulus of 5th lumbar vertebrae decreased significantly in B0-B3 groups(P0.05). CONCLUSIONS:PTH(1-34) is better than strontium ranelate in inhibiting bone loss,improving vertebral bone micro-structure and biomechanical properties of ovariectomized rats.%目的：比较雷奈酸锶与甲状旁腺激素（1-34）对卵巢切除大鼠骨质量的影响。方法：80只SD大鼠，分别接受假手术（A组， n＝10）和双侧卵巢切除（B组，n＝70）手术，术后3个月B组大鼠随机分为7组，每组10只。分别sc生理盐水[0.9 g/（kg·d），B0组]；ig雷奈酸锶低、中、高剂量[0.45、0.9、1.35g/（kg·d），B1～B3组]；sc甲状旁腺激素（1-34）低、中、高剂量[30、60、90μg/（kg·d），连续给药5 d后停止给药2 d，B4～B6组]，A组大鼠给药方案同B0组。8周后处死所有大鼠，酶联免疫吸附法（ELISA）检测大鼠血清1型前胶原氨基末端肽（P1NP）、1型胶原C端肽（CTX-1）含量；骨密度仪检测第4腰椎骨密度；微电子计算机断层扫描（CT）检测松质骨相对体积（BV/TV）、骨小梁厚度（Tb.Th）、骨小梁数量（Tb.N）和骨小梁分离度（Tb.Sp）；压缩试验检测第5腰椎最大载荷和弹性模量。结果：与A组比较，B0～B6组大鼠血清P1NP、CTX-1水平显著升高，第4腰椎骨密度、第5腰椎最大载荷、弹性模量显著降低（P＜0.05）；B0组大鼠第4腰椎BV/TV水平显著降低、Tb.Sp水平显著升高（P＜0.05）。与B0组比较，B1～B3组大鼠第4腰椎骨密度、第5腰椎最大载荷、弹性模量显著升高（P＜0.05）；B4～B6组大鼠P1NP含量、BV/TV、Tb.N水平、第4腰椎骨密度、第5腰椎最大载荷、弹性模量显著升高，且高于B1～B3组（P＜0.05）；B1～B6组大鼠Tb.Sp水平显著降低，且B4～B6组低于B1～B3组（P＜0.05）。8组大鼠Tb.Th水平比较，B0～B6组大鼠CTX-1含量比较，差异均无统计学意义（P＞0.05）。结论：甲状旁腺激素（1-34）抑制去卵巢大鼠骨丢失、改善其椎体骨微观结构和生物力学性能的作用强于雷奈酸锶。