中脑腹侧被盖区参与低频或高频电针对甩尾实验的镇痛效应

中脑腹侧被盖区 (ｖｅｎｔｒａｌｔｅｇｍｅｎｔａｌａｒｅａ,ＶＴＡ)的ＤＡ能通路在成瘾药物中的奖赏作用已被广泛研究。近年来有报道此通路参与吗啡的镇痛作用。而电针镇痛的机制与吗啡镇痛有相似之处 ,但在电针的镇痛效应中是否有此通路的参与尚无研究。本研究利用电针及核团损毁技术研究了中脑ＶＴＡ的ＤＡ能通路是否参与不同频率 (2Ｈｚ,1 0 0Ｈｚ)电针对甩尾实验的镇痛效应。不同频率电针的ＳＤ大鼠分别随机分为两组 :假损毁组及损毁组。随后通过脑立体定位技术分别进行大鼠双侧ＶＴＡ的假损毁 (注入溶 6 ＯＨＤＡ的溶剂——— 0 .3%…

Mesolimbic DA Pathways Involve the Mechanism of Electroacupuncture (EA) Analgesia

Extensive researches of mesolimbic ventral tegmental area(VTA) in drug addiction have been conducted. Recently, some evidence showed that VTA is involved in morphine analgesia. However, no data show whether the mesolimbic DA pathways involve the mechanism of electroacupuncture (EA) analgesia. In this study, the effect of bilateral 6 hydroxdopmine(with desipramine)lesions of VTA on analgesi a produced by EA with different frequencies (2 Hz and 100 Hz) was examined with tail flick tests in rats. These lesions depleted dopamine. The results showed th at EA with different frequencies produced the same degree of analgesia both in s ham lesioned and lesioned rats(P>0.05) though there was some decrease of tail flick latency(TFL) in the lesioned rats,while it appeared an increase o f TFL in lesioned rats after EA and possessed the significant difference from sh am lesioned rats( P<0.05). Further study should adopt different pain m odels to explore the effect of mesolimbic DA systems in EA analgesia.