Effects of Electroacupuncture on Pain Threshold and Prostaglandin E2 in Spinal Cord in Postoperative Pain Rat

Objective:Electroacupuncture(EA)is good at post-surgical pain.But point selection method in treating incision-induced pain remains a major clinical challenge.We reasoned that different acupoints may work though adjusting prostaglandin E2 in spinal cord.We wish to explore the analgesic mechanism of electroacupuncture on plantar incision pain rats and provide more therapeutic ideas for acupuncture analgesia.Methods:A total of 50 male rats were randomly divided into a sham operation group,a model group,an EA 1,EA 2 and a drug group(n=10,each).A rat model of left plantar incision pain was established.The rats in EA1 group was needled at ipsilateral Yanglingquan(GB34)and Taixi(KI3).The rats in EA2 group was needled at ipsilateral Quchi(LI11)and Hegu(LI4).EA stimulation(2/100 Hz,1-2-3 mA)was administered 30 minutes immediately after operation.The rats in drug group were fed with Fenbid by gavage 20 minutes before incision(30 mg/kg,p.o.).The hot plate pain detector was used to measure the thermal pain threshold(TPT)before and 24 hours after operation Prostaglandin E2 content of spinal cord was detected by enzyme-linked immunosorbent assay(ELISA)at 1 and 24 hours after operation.Results:Compared with sham operation group,the TPT in model group decreased 41%.Compared with the model group,the TPT increased 56%in EA1,29%in EA2,190%in drug group(P>0.05).At 1 h after operation,compared with the sham operation group,PGE_2 in model group increased 15%.Compared with the model group,PGE_2 in drug group decreased 5%.At 24 hours after operation,compared with sham operation group,PGE_2 in model group increased 9%.Compared with model group,it decreased 4%in EA 1 group,8%in drug group and increased 3%in EA2 group.Conclusion:Both the drug and the electroacupuncture can adjust the 24-hour pain threshold and PGE_2 in spinal cord.The curative effects of the drug are better than that of electroacupuncture.The proximal point is better than that of the distal point.Electroacupuncture can treat postoperative pain by regulating PGE_2 in spinal cord.

电针对高血脂合并脑缺血大鼠海马齿状回星形胶质细胞活化的影响

目的观察电针对高血脂合并脑缺血大鼠海马齿状回星形胶质细胞活化的影响。方法 SD成年雄性大鼠随机分为正常组、模型组、假手术组、电针1组和电针2组。高血脂阶段:饲喂高脂饲料42 d造模,电针1组电针丰隆穴,每天1次,共7 d,电针2组大鼠不做任何干预。合并脑缺血阶段:行Fecl3诱导的脑缺血模型手术。术后电针组均电针丰隆及百会穴,每天1次,共14 d。手术后第1天对所有大鼠进行神经功能缺损评分,HE染色观察神经元细胞形态学变化。实验完成后检测血清中总胆固醇(TC)、甘油三酯(TG)、高密度脂蛋白(HDL)、低密度脂蛋白(LDL)水平,免疫组化法检测缺血侧大脑海马齿状回和皮层缺血半暗带胶质纤维酸性蛋白(GFAP)的表达增加。结果与正常组比较,模型组大鼠TC、TG、LDL升高(P<0.05),电针组大鼠TG、LDL降低(P<0.01);模型组大鼠神经功能缺损评分增高,HE染色可见明显核固缩,组织排列散乱,海马齿状回和皮层缺血半暗带GFAP表达增加。与模型组相比,电针组神经功能缺损评分降低。HE染色可见神经元细胞形态有所恢复,海马齿状回和皮层半暗带GFAP表达在术后第1天减少,第7天增加,第14天减少。结论高血脂阶段电针干预配合脑缺血后电针干预,可降低血脂水平改善大鼠神经功能,调节大鼠海马星形胶质细胞的活化,从而促进脑损伤神经细胞的修复。