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Electroaupuncture(EA)on Huat'ochiachi reduced the traumatic paininduced FOS-likeprotein expression in the thalamic parafascicular nu-cleus(Pf)of rats

Lou Zhicong;Liu Yu;Li Xiaowen;Ouyang Qun;Sun Wenying(Department of Physiology)(Department of Traditional Chinese Medicine,Guangzhou,510515)  
Twenty-seven male Sprague-Dawley rats were divided into normal control(NC), EA-control(EAC),amputation(AM)and amputation plus EA(AMEA)groups. All the experiments were carried outunder the anaesthesia of 10%chloral hydrate (200 mg/kg,ip).(1)Animals in the NC group were onlyanaesthetized;(2)in the EAC group,the EA on Huat'chiachi was taken on normal rats for 30 min(80-90Hz);(3)in the AM group,the amputation was performed 0.5 cm below the right ankle joint;and(4)in theAMEA group,the EA on the Huat'ochiach was given right after the apmutation. Five hours after the oper-ation,the animals were killed,and the brain with the Pf were removed and tested for the Fos-likeproteinwith ABC method. The pain-threshold was measured on the hind limb with radiant-heat technique just be-fore the amputation and the kill.The results were as follows:(1)very few Fos-labeled neurons(FLN)in the bilateral Pf(left,L;right,R)were found in the NC group;(2)the number of the FLN in the AM group was 13.3±5.1(L)and 13.0±4.8 and the pain-threshold decreased 39%five hours after the amputation;(3)there were 4.5±2.6(L)and4.5±2.9(R)FLN in the AMEA group,less than those in the AM group(p0.01),and the pain-thresholddecreased only 11%;(4)the number was 3.6±2.0(L)and 3.5±2.1(R)in the EAC group(P0.05,com-pared with the AMEA group).It suggested the amputation as a kind of continuous iioxious stimulation could induce Fos expression in bi-lateral Pf.If we use the Fos expression as a marker of neuronal activity,the results morphologically showedthat the traumatic pain-signals could reach the bilateral Pf and activate the pain-sensitive neurons(PSN)there.What is more,the activation of the PSN in the Pf was accompanied with the decrease of pain-thresh-old. The EA on the Huat'ochiachi could supress the Fos expression and reduce the pain-threshold decrease.In conclusion,the EA on the Huat'ochiachi can modulate the transduction of pain-signals in central nervoussystem,supress the activities of the PSN in the Pf,and finally show the effect of analgesia.
【CateGory Index】: R246.2
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