机构地区:[1]汕头大学医学院第二附属医院麻醉科,515041 [2]厦门市第二医院麻醉科
出 处:《中国医药》2015年第10期1456-1459,共4页China Medicine
摘 要:目的 探讨吗啡对外周神经损伤性神经源性疼痛大鼠神经行为学及背根神经节中生长相关蛋白43(GAP-43)和神经生长因子(NGF)表达的影响.方法 选取成年SD大鼠65只,采用随机数字表法分成正常对照组(5只),坐骨神经慢性压迫性损伤(CCI)组(CCI组,20只),CCI后0.9%氯化钠注射液治疗对照组(NS组,20只),CCI后吗啡治疗组(M组,20只);CCI、NS和M组再按术后取材时间分为1、3、7、14d4个亚组(每亚组各5只大鼠).手术仅损伤有侧坐骨神经,左侧作为正常对照.吗啡给药剂量为5 mg/kg腹腔注射.CCI、NS和M组大鼠分别于术后1、3、7、14 d测量机械缩足反射阈值(MWT)和热缩腿反射潜伏期(TWL),测量完毕后取术侧背根神经节,应用免疫组织化学方法半定量检测背根神经节中GAP-43和NGF的表达.结果 CCI组、NS组、M组术后3、7、14 d MWT和TWL明显短于正常对照组[MWT:(7.3±1.2)、(7.2±0.9)、(12.6±1.6)g比(14.8±0.6)g;(5.9±0.7)、(5.8±0.6)、(7.9 ±0.8)g比(14.8±0.7)g;(4.3±0.4)、(4.5±0.7)、(5.4 ±0.6)g比(14.8±0.5)g;TWL:(1.07±0.05)、(1.05±0.06)、(1.31±0.16)s比(1.45±0.11) s;(0.97±0.05)、(0.96±0.05)、(1.10±0.12)s比(1.45±0.10)s;(0.86 ±0.04)、(0.88±0.07)、(1.01 ±0.06)s比(1.45±0.12)s,P<0.01],背根神经节中GAP43和NGF的表达水平明显高于正常对照组[GAP-43:(114.8±6.3)、(1 18.8±6.4)、(94.4±5.2)比(62.2±2.5);(118.0±4.3)、(122.4±5.5)、(89.7±3.0)比(62.2±2.5);(140.2±5.2)、(135.7±5.9)、(84.5±8.1)比(62.2±2.5);NGF:(134.0±3.8)、(131.5±3.6)、(98.3±3.6)比(71.6±3.4);(120.4±4.7)、(118.9±4.4)、(103.2±7.2)比(71.6±3.4);(1 17.9±4.1)、(1 16.5±5.9)、(95.4±3.6)比(71.6±3.4),P<0.01];M组与NS组和CCI组比较,术后3、7、14 d同时点的MWT和TWL均明显延�Objective To explore the effect of morphine on the neurological behavior,the expression of growth associated protein-43 (GAP-43) and nerve growth factor (NGF) in the dorsal root ganglion in neuropathic pain rat model induced by peripheral nerve chronic constriction injury.Methods Sixty-five SD rats were randomly divided into normal group (n =5),chronic constriction injury of the sciatic nerve (CCI) group (n =20),NS group (n =20,CCI + 0.9% sodium chloride) and M group (n =20,CCI + morphine).The rats in CCI,NS,M groups were divided equally into 4 subgroups according to the time points (1,3,7 and 14 days after surgery).In surgery,the right sciatic nerve was injured and the left side nerve was as a normal control.The morphine was given with a dosage of 5 mg/kg.The mechanical withdrawal threshold (MWT) and thermal withdrawal latency (TWL) of the rats in CCI,NS,M groups 1,3,7 and 14 days after operation were measured;the dorsal root ganglions of injured sciatic nerves were harvested and immunohistochemistry was used to examine the expression of GAP-43 and NGF.Results Compared with those in normal group,the MWT and TWL in CCI,NS,M groups were significantly decreased 3 days [(7.3 ± 1.2),(7.2 ±0.9),(12.6±1.6) g vs (14.8 ±0.6) g;(1.07 ±0.05),(1.05 ±0.06),(1.31 ±0.16) s vs (1.45 ±0.11) s],7days [(5.9±0.7),(5.8 ±0.6),(7.9±0.8) gvs (14.8±0.7) g;(0.97±0.05),(0.96±0.05),(1.10±0.12) s vs (1.45±0.10) s] and 14 days after surgery [(4.3 ±0.4),(4.5±0.7),(5.4±0.6) gvs (14.8±0.5) g;(0.86±0.04),(0.88±0.07),(1.01 ±0.06) s vs (1.45 ±0.12) s] (P〈0.01).The expressions of GAP-43 and NGF in the dorsal root ganglion had a significant increase in CCI,NS,M groups compared with those in control group3 days [(114.8±6.3),(118.8±6.4),(94.4±5.2) vs (62.2±2.5);(134.0±3.8),(131.5±3.6),(98.3±3.6) vs (71.6±3.4)],7 days [(118.0 ±4.3),(122.4
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