电针对膝骨关节炎家兔关节液中自由基的影响

目的:探讨电针治疗膝骨关节炎的机制。方法:新西兰大白兔40只随机分为空白对照组(A组)、模型对照组(B组)、手法治疗组(C组)、电针治疗组(D组)。左膝关节伸直位石膏固定7周制成骨性关节炎动物模型。造模成功后,C组给予推拿按摩加功能训练;D组取左后肢"阳陵泉"血海"足三里"和"梁丘"穴电针治疗,电压6 V,疏密波型,频率1.6~2 Hz,输出强度1~2 mA,每天1次,每次留针25 min,连续治疗21 d。分别于造模成功后和治疗结束后采集4组动物的关节液,用黄嘌呤氧化酶法(羟胺法)测定超氧化物歧化酶(SOD)活力,硫代巴比妥酸法测定丙二醛(MDA)含量,硝酸还原酶法测定一氧化氮(NO)含量。结果:与模型对照组比较,电针和手法治疗组均可以显著降低关节液中MDA和NO的含量,提高SOD的活力,(P<0.05);电针组和手法组处理前后比较差异有显著性意义(P<0.05);而电针组与手法组比较,各指标间差异均无显著性意义(P>0.05)。结论:电针和手法治疗可明显降低膝骨关节炎关节液中MDA和NO的含量,提高SOD活力,这可能是此两种疗法改善骨关节炎的机制之一。

Effects of Electroacupuncture on Synovia Free Radicals in Rabbits with Knee Osteoarthritis

OBJECTIVE: To observe the effect of electroacupuncture( EA) on synovia superoxide dismutase (SOD) activity, malondialdehyde (MDA) and nitric oxide (NO) contents in rabbits with knee osteoarthritis (KOA). METHODS: A total of 40 New Zealand rabbits were randomly divided into control, model, massage and EA groups, with 10 cases in each. KOA model was established by gypusum fixing method. EA (1.6-2 Hz, 1-2 mA) was applied to left "Yanglingquan" (GB 34), "Xuehai" (SP 10), "Zusanli" (ST 36) and "Liangqiu" (ST 34) for 25 min, once daily for 21 days. For massage group, the affected knee joint was pressed, kneaded, stretched and rotated repeatedly for 15 min every time, followed by forced running about 100 m. The intra-joint synovia was collected (0.4-0.6 ml) for detecting contents of SOD with xanthine oxidase method, MDA with thiobarbituric acid method and NO with nitrate reductase method. RESULTS: Compared with control group, synovia SOD activity in model group decreased considerably (P<0.05), while MDA and NO contents increased significantly (P<0.05). After 3 weeks' treatment, compared with pre-treatment and model group, synovia SOD activity increased markedly (P<0.05), and MDA and NO contents lowered remarkably in both EA and massage groups (P<0.05). No significant differences were found between EA and massage groups in these 3 indexes (P>0.05). CONCLUSION: Both EA and massage can raise synovia SOD activity and lower MDA and NO content, which may contribute to their effect in relieving knee osteoarthritis in the rabbit.