国际麻醉学与复苏杂志   2014, Issue (10): 1-1
    
大麻素受体2激动剂JWH-015对骨癌痛大鼠脊髓背角磷酸化环磷酸腺苷反应元件结合蛋白的影响
孙蓓, 张羽, 冷鑫, 顾小萍, 马正良1()
1.南京市鼓楼医院麻醉科
The effect of cannabinoid 2 receptor agonist JWH-015 on pCREB in spinal dorsal horn in a rat model of bone cancer pain
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摘要:

目的 探讨腹腔注射大麻素受体(cannabinoid receptor, CB)2激动剂对骨癌痛大鼠脊髓背角磷酸化环磷酸腺苷反应元件结合蛋白(phosphorylated cyclic AMP response element binding protein, pCREB)表达的影响。 方法 运用随机数字表法将63只雌性SD大鼠分为3组:肿瘤给药组(J组, 15只)、肿瘤对照组(D组,24只)和假手术对照组(S组,24只)。J组、D组的大鼠左侧胫骨上端骨髓腔被注入5 μl Walker256大鼠乳腺癌细胞制备骨癌痛模型;S组则注入等量的生理盐水。在造模后第10天,J组腹腔注射JWH?蛳015(100 μg/500 μl),D组、S组注射等量JWH-015溶剂二甲基亚砜(dimethylsulfoxide, DMSO)。每组大鼠于造模前1 d,造模后4、7、10 d,腹腔注射后2、6、24、48、72 h,检测手术侧机械刺激缩足阈值(paw withdrawal mechanical threshold, PWMT)和行走痛行为学评分。D组和S组大鼠于造模后4、7 d,J组、D组和S组大鼠于造模后10 d及腹腔注射后6、24、72 h,取脊髓腰膨大进行免疫印迹分析。 结果 与S组比较,J组和D组大鼠造模后7 d PWMT开始降低(P<0.05),造模后10 d行走痛行为学评分增加(P<0.05),脊髓背角pCREB表达水平于7、10 d上调(P<0.05)。与D组比较,腹腔注射JWH-015后24 h,J组PWMT(8.7±1.6) g显著上升(P<0.05),行走痛行为学评分(1.0±0.6) 分和pCREB的表达(0.56±0.10)明显下降(P<0.05)。 结论 腹腔注射JWH-015可能通过下调脊髓背角pCREB的表达改善骨癌痛大鼠的痛行为。

关键词: 大麻素受体; 骨癌痛; 大鼠; 磷酸化环磷酸腺苷反应元件结合蛋白
Abstract:

Objective To investigate the change of phosphorylated cyclic AMP response element binding protein (pCREB) in spinal dorsal horn in a rat model of bone cancer pain, after intraperitoneal injection JWH-015. Methods Sixty-three female SD rats were randomly divided into 3 group: medication administration of JWH-015 group (group J, n=15), medication administration of dimethylsulfoxide(DMSO) group (group D, n=15) and sham group(group S, n=21). Group J, D: 5 μl Walker256 breast cancer cells of rat were implanted into the intramedullary space of the left tibia of rat to induce ongoing bone cancer pain model, rats of group S were implanted 5 μl NS. On 10 d after implantation, JWH-015(100 μg/500 μl) was injected into rats of group J, and DMSO was injected into rats of group D and S. The paw withdrawal mechanical threshold(PWMT) and ambulatory pain of each group were detected on 1 d before implantation, and 4, 7, 10 d after implantation, and 2, 6, 24, 48, 72 h after injection . Then, Lumbar intumescentia of rat were taken out to analyze Western?蛳blotting at 4, 7 d after implantation of group D and S, 10 d after implantation, 6, 24, 72 h after injection of group J, D, S. Results Compared with group S, at day 7 after the implantation, the PWMT of group J and D were significantly decreased (P<0.05), at day 10 after the implantation, the ambulatory pain of group J and D were obviously increased. The expression of pCREB in spinal dorsal horn were up-regulated at day 7 and 10(P<0.05). Compared with group D, 24 h after injection, the rat of group J showed remarkable rising of PWMT (8.7±1.6) g and reducing of ambulatory pain (1.0±0.6) and the expression of pCREB (0.56±0.10) (P<0.05). Conclusions Iintraperitoneal injection JWH-015 attenuated bone cancer pain, which may be acted via down-regulating the expression of pCREB in spinal dorsal horn.

Key words: Cannabinoid receptor; Bone cancer pain; Rat; Phosphorylated cyclic AMP response element binding protein