维生素E联合红景天对低氧复合运动小鼠骨骼肌保护作用的研究

目的 探讨维生素E联合红景天对低氧复合运动小鼠骨骼肌细胞损伤的保护性作用及其机制.方法 将40只ICR小鼠按照随机数字表法分为对照组和观察组,每组均为20只.对照组小鼠给予灌胃维生素E(40 mg·kg-1·d-1),观察组小鼠给予灌胃维生素E(40 mg·kg-1·d-1)+红景天提取液(20 g·kg-1·d-1),两组小鼠连续给药15 d后进行为期4周的低氧(氧浓度11.3%)复合运动(5 ℃,15 m/min,60 min/d).最后一次运动后处死小鼠检测骨骼肌血清甘肽过氧化物酶(GSH-PX)、超氧化物歧化酶(SOD)、活性氧类物质(ROS)、丙二醛(MDA);逆转录PCR(RT-PCR)法检测骨骼肌B淋巴细胞瘤-2(Bcl-2)和Bcl-2相关X蛋白(Bax)基因mRNA水平的表达,进行氧复合运动过程中(运动前、1、2、4周)监测外周血清肌酸激酶(CK)、乳酸脱氢酶(LDH).结果 运动后各时间点观察组CK与LDH活性均低于对照组(P<0.05).观察组小鼠骨骼肌组织的GSH-PX、SOD活性明显高于对照组(P<0.05),而ROS、MDA低于对照组(P<0.05);观察组小鼠骨骼肌组织Bax基因mRNA水平的表达与Bax/Bcl-2比值均明显低于对照组(P<0.05),而Bcl-2基因mRNA水平的表达明显高于对照组(P<0.05).结论 红景天联合维生素E能通过纠正低氧运动下的氧化与抗氧化失衡而抑制凋亡基因的表达.

The protective effects of Rhodiola rosea combined with vitamin E on the skeletalmuscle through hypoxia combined with exercise training in mice

Objective To study the protective effects of vitamin E combined with Rhodiola rosea on the injury in mice skeletal muscle through hypoxia with exercise training and research the mechanism of action.Methods Forty ICR mice were randomly divided into control group and observation group,20 mice in each group.The control group was given Vitamin E (40 mg·kg-1·d-1),and the observation group was given Vitamin E (40 mg·kg-1·d-1)combined with Rhodiola rosea (20 g·kg-1·d-1);the rats in the two groups were treated with hypoxia (11.3%) for 4 weeks (5 ℃,15 m/min,60 min/d) after 15-day drug using.After the last training,all the mice were euthanized and then detected the gene of Bax and Bcl-2 mRNA through the RT-PCR in the skeletal muscle and the activity of GSH-PX,SOD,ROS,the concentration of MDA in the skeletal muscle.During the period (pretrain and 1,2,4 weeks) of hypoxia combined with exercise training,the CK,LDH in the serum were detected.Results The expression of CK and LDH in the observation group were lower than those of the control group (P<0.05).The activity of GSH-PX and SOD in the skeletal muscle of the observation group was significantly higher than that of the control group (P<0.05),while the ROS and MDA were lower than those of the control group(P<0.05);the expression of Bax mRNA and Bax/Bcl-2 of the observation group was significantly lower than that of the control group(P<0.05).While the expression of Bcl-2 mRNA was significantly higher than that of the control group(P<0.05).Conclusion Rhodiola rosea combined with Vitamin E can inhibit the expression of apoptotic genes by correcting the oxidation and hypoxia imbalance under hypoxia.