鞘内联合注射地塞米松和Akt抑制剂对背根神经节压迫大鼠的镇痛作用  被引量:2

Analgesia effects of intrathecally coadministered dexamethasone and Akt inhibitors on chronic dorsal root ganglion compression-induced pain in mouse

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作  者:张兢[1] 顾小萍[1] 马正良[1] 

机构地区:[1]南京大学医学院附属鼓楼医院麻醉科,南京210008

出  处:《中华行为医学与脑科学杂志》2011年第8期673-676,共4页Chinese Journal of Behavioral Medicine and Brain Science

基  金:国家自然科学基金资助项目(30872439/c160202);卫生部课题资助项目(WKJ2006-2-8);江苏省科教兴卫工程重点人才课题(RC2007012);江苏省教育厅开放课题(KJS06001)

摘  要:目的在大鼠慢性背根神经节压迫模型中观察鞘内联合注射大剂量地塞米松(Dexamethasone,Dex)和Akt抑制剂1W的镇痛效果。方法选择成功鞘内置管后无运动障碍的雄性SD大鼠40只,随机分为假手术组(Sham组,n=8)、溶剂对照组(CCD组,n=8)、Dex组(D组,rt=8)、Akt抑制剂组(A组,n=8)和Dex联合Akt抑制剂组(DA组,n=8),制备根性神经痛模型。D组、A组和DA组分别于造模后第3,13天,每次鞘内给予Dex(100μg/kg)、Akt抑制剂(0.6μg/10μl)、Dex(100μg/kg)+Akt抑制剂(0.6μg/10μl)。Sham组和C组则给予等量的溶剂(10%DMSO)。于造模前3d、术后第3,4,7,10,13,14,15天测量术侧足底机械缩足阈值(PWMT)和热辐射刺激潜伏期(PWTL)。结果与Sham组相比,CCD组术后压迫侧PWMT(P〈0.01)和PwTL(P〈0.01)明显降低。与CCD组相比,造模后第3天,鞘内分别给予Dex、Akt抑制剂、Dex+Akt抑制剂后,PWMT(7.33±1.03)g、(5.67±1.03)g、(2.67±1.03)g(P〈0.01),PWTL(16.47±0.46)S、(14.48±0.84)S、(10.82±2.21)S(P〈0.01),随后逐渐下降,第13天鞘内再次分别给予Dex、Akt抑制齐0后,PWMT(7.33±1.03)g、(5.67±1.03)g、(2.33±0.81)g(P〈0.01),PWTL(16.44±0.90)S、(14.01±0.82)S、(10.22±1.28)s(P〈0.01)。而术后第3天,鞘内联合使用Dex和Akt抑制剂后,产生明显的协同作用,第4天PWMT(10.83±2.04)g、(2.67±1.03)g(P〈0.01),PWTL(19.11±2.01)s、(10.82±2.21)S(P〈0.01);第14天PWMT(7±0.82)g、(2.33±0.81)g(P〈0.01),PWTL(17.16±1.14)s、(10.22±1.28)S(P〈0.01)。结论鞘内注射大剂量地塞米松或Akt抑制剂可以有效改善慢性背根神经节压迫引起的痛行为学反应,而联合大剂量地塞米松和Akt抑制剂1V具有共Objective To investigate the analgesic effects of intrathecal dexamethasone injection on pain induced by chronic compression of dorsal root ganglion in mouse. Methods Using rat model of radieular pain induced by chronic compression of dorsal root ganglion (CCD) , 40 male SD rats successfully received intrathecal catheter implantation and without motor dysfunction were randomly divided into 5 groups : Sham-operation group ( Sham group, n = 8 ), Control group ( CCD group, n = 8 ), Dexamethasone group ( D group, n = 8 ), Akt inhibitor Ⅳ group (A group, n = 8 ) and Dexamethasone plus Akt inhibitor Ⅳ group (DA group, n = 8). Rats in D group, A group or D A group were intrathecally treated with dexamethasone ( 100 μg/kg) , Akt inhibitor Ⅳ (0.6 μg/10 μl) or dexamethasone ( 100 μg/kg) plus Akt inhibitor Ⅳ (0.6 μg/10μl) on Day 3,13 after CCD respectively,while rats in C and Sham group received Vehicle (10% DMSO). Paw withdrawal mechanical threshold (PWMT) and paw withdrawal thermal latency (PWTL) were tested on 3 d before and 3 d,4 d,7 d,10 d,13 d,14 d and 15 d after operation. Results Compared with Sham group, both PWMT (P 〈 0.01 ) and PWTL (P 〈 0.01 ) were significantly decreased after CCD surgery on the ipsilateral side. After dexamethasone and Akt inhibitor were respectively intratheeally injected at 3 postoperative day,PWMT (7.33 ± 1.03 ) g, (5.67 ± 1.03 ) g, (2.67 ± 1.03 ) g (P 〈 0.01 ), PWTL( 16.47 ± 0.46 ) s, ( 14.48 ± 0.84 ) s, ( 10.82 ± 2.21 ) s (P 〈 0.01 ), then decreased gradually, and intratheeally injected again at 13 postoperative day, PWMT (7.33 ± 1.03 ) g, (5.67 ± 1.03 ) g, (2.33 ± 0.81 ) g (P 〈 0.01 ), PWTL( 16.44 ± 0.90) s, ( 14.01 ± 0.82 ) s, ( 10.22 ± 1.28 ) s (P 〈 0.01 ). Coadministration dexamethasone and Akt inhibitor exhibit significant synergies, postoperative 4 d PWMT( 10.83 ± 2.04 ) g, ( 2.67 ± 1.03 ) g (P 〈0.01) ,PWT

关 键 词:糖皮质激素 PKB/AKT 神经病理性疼痛 

分 类 号:R745[医药卫生—神经病学与精神病学]

 

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