探索 electroacupuncture (EA ) 的机制的目的在老鼠在长期的疼痛上导致了累积止痛效果与或没有卵巢切除术(OVX ) 。110 只女 Wistar 老鼠全部的方法 A 被使随机化进正常控制(n=10 ) ,长期的紧缩的损害(CCI, n=10 ) , CCI+EA (n=30 ) , OVX+CCI (n=30 ) ,和 OVX+CCI+EA (n=30 ) 组织。每 3 组织的后者进一步被划分成 2 天(2 d ) , 2 个星期(2 W ) 和 3 个星期(3 W ) 亚群,分别地(在每亚群的 n=10 ) 。CCI 疼痛模型被恰好臀部的神经的绑扎建立,并且记忆缺陷模型由 OVX 复制了。爪退却潜伏(PWL,疼痛阀值) 被辐射热照耀双边的踏板检测,并且在 PWL (PWLD ) 的双边的差别被用来在疼痛反应评估变化。莫利斯舞水迷宫测试为评估老鼠鈥 ? 学习记忆能力被进行。EA 分别地为 2 d, 2 W 和 3 W 被用于双边的 Zusanli (ST36 ) 和 Yanglingquan (GB34 ) 。内啡肽(EP ) 和 adrenocorticotrophic 荷尔蒙(ACTH ) 满足的垂体和 hypothalamic 尾 - 被 immunoradioassay 检测。结果与 CCI 组,相比, CCI+EA-3 W 组的 PWLD signifificantly 减少了(P < 0.05 ) 。与 OVX+CCI 组相比, OVX+CCI+EA-3 W 组的 PWLD 更加被降低(P < 0.05 ) ,但是价值比它正常控制和 CCI+EA 组的基础价值和那些显著地高(P < 0.05 ) 。与 sham-OVX 组比较,逃跑潜伏,在目标象限的游泳距离( SD )和全部的 SD 在 OVX 组显著地被增加( P < 0.05 ),当目标站台十字路口的数字 signifificantly 被减少时( P < 0.05 ),建议 OVX 老鼠鈥?学习记忆能力的一个缺陷。在简单 CCI 老鼠,垂体的尾 - EP 和 ACTH 内容显著地增加了(P < 0.05 ) ,并且那些与正常控制组相比显然视下丘减少了(P < 0.05 ) 。在 EA 以后,垂体和 hypothalamic ACTH 层次 signifificantly 在内容与 CCI 组比较在 3 W 显然增加了的 2 d 和 hypothalamic ACTH 和尾 - EP 被降低(P < 0.05 ) 。在 OVX+CCI 老鼠,后面的 EA ,在 2 d 的垂体尾- EP 内容, 2 W 和 3 W ,和 hypothalamic 尾- EP
Objective: To explore the mechanism of electroacupuncture (EA)-induced cumulative analgesic effects on chronic pain in rats with or without ovariectomy (OVX). Methods: A total of 110 female Wistar rats were randomized into normal control (n=10), chronic constrictive injury (CCI, n=10), CCI+EA (n=30), OVX+CCI (n=30), and OVX+CCI+EA (n=30) groups. Each of the latter 3 groups was further divided into 2 days (2 d), 2 weeks (2 W) and 3 weeks (3 W) subgroups, respectively (n=10 in each subgroup). The CCI pain model was established by ligature of the right sciatic nerve, and the memory impairment model duplicated by OVX. The paw withdrawal latency (PWL, pain threshold) of the bilateral footplates was detected by radiant heat irradiation, and the bilateral difference in PWL (PWLD) was used to evaluate changes in the pain reaction. Morris water maze test was conducted for evaluating the rats' learning-memory ability. EA was applied to bilateral Zusanli (ST36) and Yanglingquan (GB34) for 2 d, 2 W and 3 W, respectively. Pituitary and hypothalamic 13-endorphin (EP) and adrenocorticotrophic hormone (ACTH) contents were detected by immunoradioassay. Results: Compared with the CCI group, PWLD of the CCI+EA-3 W group decreased significantly (P〈0.05). Compared with the OVX+CCI group, PWLD of the OVX+CCI+EA-3 W group was lowered considerably (P〈0.05), but the value was markedly higher than its basal value and those of the normal control and CCI+EA groups (P〈0.05). In comparison with the sham-OVX group, the escape latency, swimming distance (SD) in the target quadrant and total SD were increased remarkably in the OVX group (P〈0.05), while the number of target platform crossings was decreased significantly (P〈0.05), suggesting an impairment of the OVX rats' learning-memory ability. In simple CCI rats, both β-EP and ACTH contents of the pituitary increased markedly (P〈0.05), and those of the hypotha