抗氧化剂对去卵巢大鼠骨生物力学和血清生化指标的影响

Effects of antioxidants on the biomechanical and biochemical markers in ovariectomized rats

目的研究抗氧化剂VitC、VitE及还原型谷光甘肽（GSH）不同配伍用药方法对去卵巢骨质疏松症大鼠骨生物力学及血清生化指标的影响，探讨抗氧化剂不同方案对去卵巢大鼠骨质疏松症的治疗作用。方法4个月龄雌性SD大鼠70只，随机取50只行双侧卵巢切除术，20只行假手术。3个月后随机从手术组和假手术组各取10只大鼠检测体质量、子宫湿重、左侧股骨及腰椎骨密度、生物力学特性和血清生化指标Ca^2＋、肌肝（Cr）、碱性磷酸酶（ALP）水平，以确定骨质疏松模型建立成功。确定模型建立成功后，其余动物分为A（假手术）、B（去卵巢生理盐水对照组，OVX control）、C（VitC＋VitE）、D（GSH）、E（VitC＋VitE＋GSH）五组，每组10只。VitC[750mg／（kg·d）]、GSH[125mg／（kg·d）]腹腔注射，VitE[250mg／（kg·d）]灌胃，模型组每天以生理盐水腹腔注射。3个月后，检测各组动物左侧股骨及第5腰椎生物力学特性和血清生化指标。结果检测骨质疏松模型实验中，模型组动物同假手术组相比，体质量明显增加，子宫萎缩，子宫湿重显著降低，左侧股骨及腰椎骨密度明显降低，左侧股骨生物力学最大载荷显著降低，血清Ca^2＋、ALP、Cr水平升高。抗氧化剂治疗3个月后，与模型组相比，治疗组D、E组左侧股骨最大载荷、弹性载荷以及第5腰椎最大载荷均明显增加；血清ALP各组均显著降低；超氧化物歧化酶（SOD）、谷光苷肽过氧化物酶（GSH—Px）水平和血清抑制OH能力D、E组显著升高；丙二醛水平C、D组显著降低；各组血清Ca^2＋水平无明显改变。结论抗氧化剂用药组合GSH和GSH＋VitC＋VitE能明显改善骨生物力学最大载荷和弹性载荷及血清抗氧化指标抑制OH^-能力、SOD和GSH—Px，对骨质疏松具有较显著改善作用。

Objective To investigate the effects of different combinations of antioxidants VitC, VitE and GSH on the biomechanical and biochemical markers in ovariectomized rats. Methods Seventy female SD rats, aged 4 months, were divided into 2 groups （control and model） randomly. Fifty rats in the model group underwent ovariectomy, while the other 20 rats in the control group had sham operations. Three months later, 10 rats in the model group and 10 rats in the control group were selected randomly to detect their body weight, uterus weight, BMD of the left femur and lumbar vertebra, biomechanical characteristics of the left femur, levels of serum Ca^2＋, Cr, ALP, SOD, MDA and GSH-Px and serumal resistance to OH^-. Then the rest were divided into 5 groups： A （sham）, B （model）, C （VitC ＋ VitE）, D （GSH）, and E （VitC ＋ VitE ＋ GSH）. VitC, VitE and GSH were given in 750 mg/kg, 250 mg/kg, and 125 mg/kg every day for 3 months, respectively. And then the biomechanical and biochemical markers were measured. Results Three months after ovariectomy, the body weight of the rats in the model group increased markedly compared with the control group, while BMD of the left femur and lumbar vertebra, biomechanical maximal load and uterus weight decreased. The serum levels of Ca2 ＋, ALP and Cr increased. Three months after antioxidant treatment, the biomechanical maximal load and elastic load of the left femur and the maximal load of the 5th lumbar vertebra, the serum levels of SOD, GSH-Px and the serumal resistance to OH in groups D and E increased markedly, while the serum level of MDA decreased in groups C and D and the level of serum ALP decreased in all the treatment groups. Conclusion GSH and combination of VitC, VitE and GSH play a positive role in treatment of osteoporosis in ovariectomized rats.