摘要
目的观察鞘内注射钙,钙调蛋白依赖性蛋白激酶Ⅱ(Ca2+/calmodulin dependent proteinkinaseⅡ,CaMKⅡ)抑制剂KN93对腰背根神经节慢性压迫(chronic compression of dorsal root ganglion,CCD)大鼠神经病理性疼痛的影响。方法SD雄性大鼠48只,按随机数字表法分为3组:假手术组(S组,11只)、CCD模型组(C组,11只)、KN93组(K组,26只)。C组、K组制备CCD模型,S组仅暴露L。椎间隙。术后14dS组和C组鞘内注射10%溶媒二甲基亚砜(dimethylsulfoxide,DMSO)25μl,K组鞘内注射溶于10%DMSO的KN9350μg/25μl。各组在造模前1d(t1),造模后4(t2)、7(t3)、10(t4)、14d(t5)随机取8只大鼠检测热缩足反射潜伏期(paw withdrawal thermal latency,PWTL)和机械缩足反射阈值(paw withdrawal mechanical threshold,PWMT);并于鞘内注射DMSO或KN93后2(t6)、4(t7)、10(t8)、12(t9)、24h(t10)时进行相同的行为学检测。各组于给药前以及K组的给药后各时间点(t6.t9)随机取8只大鼠处死并取脊髓腰膨大部分,采用Westernblot方法检测CaMK11蛋白表达水平。结果鞘内给药后t6.t9时点,K组PWTL[(14.7±1.6)、(18.6±1.8)、(21.2±2.5)、(15.3±2.0)S],PWMT[(12.0±1.0)、(15.4±1.4)、(17.5±1.7)、(14.9±1.6)g]比C组PWTL[(11.6±1.8)、(10.7±1.7)、(11.7±2.4)、(9.9±1.7)s],PWMT[(8.4±0.9)、(9.6±1.6)、(10.6±1.7)、(8.9±1.3)g]升高,差异有统计学意义(P〈0.05)。给药前及给药后t10时,K组PWTL、PWMT与C组比较,差异无统计学意义(P〉0.05o和t5时CaMKII值(1.55±0.12)比较,给药后t6~t9时间点CaMKⅡ蛋白[(1.37±0.11),(1.15±0.12)、(0.75±0.08)、(0.86±0.12)]表达下降(P〈0.05)。结论鞘内注射KN93可有效缓解神经病理性疼痛大鼠的疼痛反应。
Objective To investigate the effect of KN93, an inhibitor of Ca2 +/calmodulin dependent protein kinase Ⅱ (CaMK Ⅱ ), on the neuropathic pain of the chronic compression of dorsal root ganglion (CCD) model rats. Methods Forty-eight male SD rats were randomly divided into 3 groups: sham group (group S, n=11 ), CCD model group (group C, n=11 ), KN93 group (group K, n=26) . Group C and group K were operated with the model of neuropathic pain induced by CCD, group S were treated as sham operated rats. Fourteen days after operation, group S and group C received intrathecal injection of 10% dimethyl sulfoxide (DMSO) 25 μl, while group K received intrathecal injection of 50 μg KN93 dissolved in 25 μ1 10% DMSO. Pain behavior tests including paw withdrawal thermal latency (PWTL) and paw withdrawal mechanical threshold (PWMT) were detected on eight rats randomly selected from each group before(t1 ) and 4(t2), 7(t3), 10(t4), 14 d(t5) after operation. Group S, group C and group K also received the same tests 2(t6), 4(t7), 10(t8), 12(t9), 24 hi 10) after administration of DMSO or KN93. In all three groups before administration and in group K after administration at each time point (t6-t9), 3 randomly selected rats were sacrificed and each expansion part of spinal cord was obtained. Western blot was used to detect the expression level of CaMK Ⅱ protein. Results From t6 to t9 after administration, group K PWTL[ (14.7±1.6), (18.6±1.8), '(21.2±2.5), (15.3±2.0) s] and PWMT[ (12.0±1.0), (15.4±1.4), ( 17.5±1.7 ), (14.9±1.6) g ] were increased when compared with group C PWTL[ ( 11.6±1.8 ), ( 10.7±1.7 ), (11.7±2.4), (9.9±1.7) s] and PWMT[(8.4±0.9), (9.6±1.6), (10.6±1.7), (8.9±1.3) g](P〈0.05). Before and 24 h(tl0) after administration, group K PWTL and PWMT had no significant difference when compared with group C (P〉0.05). Compared to the basic value(t5) (1.55±0.12) prior to the administration, the expression of CaMK Ⅱ from t6 to t9[ ( 1.37±0.11 ), (1.15±0.12), (0.75±0.08), (0.86±0.12) ] were significantly decreased (P〈0.05). Conclusions Intrathecal administration of KN93 may play an important role in relieving pain of neuropathie pain rats.
出处
《国际麻醉学与复苏杂志》
CAS
2015年第2期117-121,共5页
International Journal of Anesthesiology and Resuscitation
基金
国家自然科学基金,江苏省医学重点学科,江苏省医学重点人才