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淫羊藿次苷Ⅱ对大鼠坐骨神经损伤后功能恢复和神经再生的影响

2016-10-19彭晴刘涛余昌胤

中国医药导报 2016年5期

彭晴 刘涛 余昌胤

淫羊藿次苷Ⅱ對大鼠坐骨神经损伤后功能恢复

和神经再生的影响

彭 晴1 刘 涛1 余昌胤1 李国艳1 龚其海2

1.遵义医学院附属医院神经内科,贵州遵义 563000;

2.遵义医学院基础药理省部共建教育部重点实验室,贵州遵义 563099

[摘要] 目的 观察淫羊藿次苷Ⅱ(IcsⅡ)对大鼠坐骨神经钳夹损伤后功能恢复和神经再生的影响。 方法 将64只雄性SD大鼠随机分为正常组、假手术组、模型组和IcsⅡ治疗组,每组16只,观察时间点为4、8周,每个时间点8只。取右侧臀部斜切口、距梨状肌5 mm处钳夹5 min损伤坐骨神经,损伤宽度为3 mm。IcsⅡ治疗组在建模后即日起予以IcsⅡ 4 mg/(kg·d)连续灌胃。采用坐骨神经指数(SFI)观察坐骨神经功能恢复情况,苏木精-伊红(HE)染色观察腓肠肌形态学变化,Masson染色观察坐骨神经组织学变化,免疫组织化学法检测坐骨神经生长相关蛋白(GAP-43)表达。 结果 在4周和8周时:①神经功能:IcsⅡ治疗组大鼠神经功能恢复更快,SFI指数(分)均高于模型组[(-56.77±3.42)比(-79.07±14.44),(-19.52±17.85)比(-75.37±7.23)](P < 0.05);②腓肠肌形态学:IcsⅡ治疗组腓肠肌肌纤维截面积(μm2)明显高于模型组[(5201.11±453.44)比(2618.81±514.26),(10 784.99±978.20)比(3222.21±400.01)](P < 0.05),腓肠肌湿质量残存率(%)高于模型组[(53.86±7.76)比(39.88±9.07),(71.67±15.18)比(48.86±6.71)](P < 0.05);③坐骨神经组织学:IcsⅡ治疗组坐骨神经轴突数目(个)高于模型组[(394.50±12.02)比(160.50±9.19),(474.50±33.24)比(289.50±6.36)](P < 0.05),平均光密度高于模型组[(0.462±0.036)比(0.455±0.004),(0.484±0.011)比(0.462±0.016)](P < 0.05);④免疫组织化学法:IcsⅡ治疗组坐骨神经GAP-43蛋白平均光密度值比模型组高[(0.175±0.012)比(0.166±0.006),(0.196±0.010)比(0.169±0.006)](P < 0.05)。以上各项指标,模型组和治疗组均低于正常组和假手术组(P < 0.05),正常组和假手术组比较差异无统计学意义(P > 0.05)。 结论 IcsⅡ能促进坐骨神经钳夹损伤后的功能恢复,促进神经再生。

[关键词] 淫羊藿次苷Ⅱ;坐骨神经;神经再生

[中图分类号] R745.4 [文献标识码] A [文章编号] 1673-7210(2016)02(b)-0012-05

Effects of Icarisid Ⅱ on functional recovery and nerve regeneration after sciatic nerve injury in rats

PENG Qing1 LIU Tao1 YU Changyin1 LI Guoyan1 GONG Qihai2

1.Department of Neurology Medicine, Affiliated Hospital of Zunyi Medical University, Guizhou Province, Zunyi 563000, China; 2.Key Laboratory of Basic Pharmacology of Ministry of Education, Zunyi Medical University, Guizhou Province, Zunyi 563099, China

[Abstract] Objective To explore the effects of Icarisid Ⅱ (IcsⅡ) on functional recovery and nerve regeneration after sciatic nerve crush injury in rats. Methods A total of 64 male SD rats were randomly divided into four groups: normal group, sham operation group, model group and IcsⅡ group, with 16 rats in each group. There were 2 observation time points in every group: 4 and 8 weeks with 8 rats in each time point. The injuries of sciatic nerve were created through an oblique incision (3 mm in width) in right buttock at the inferior boarder 5 mm below the piriformis for 5 min. IcsⅡ group was administered by IcsⅡ at a dose of 4 mg/(kg·d) by gavage on 1st day after modeling. The functional recovery was evaluated by sciatic functional index (SFI). Morphological change in gastrocnemius was observed by hematoxylin-eosin (HE) staining after the rats were sacrificed. Histological change in sciatic nerve was observed by Masson staining. Immunohistostaining was used to detect the expression of growth associated protein-43 (GAP-43). Results At 4 weeks and 8 weeks, ①nerve function: the functional recovery after the use of IcsⅡ was faster than that of model group, the scores of SFI (points) in IcsⅡ group were higher than those of model group [(-56.77±3.42) vs (-79.07±14.44), (-19.52±17.85) vs (-75.37±7.23)] (P < 0.05); ②morphological change in gastrocnemius: the transverse areas of muscle fiber (μm2) were significantly higher than those of model group [(5201.11±453.44) vs (2618.81±514.26), (10 784.99±978.20) vs (3222.21±400.01)] (P < 0.05), so as the recovery rate of gastrocnemius muscle's wet weight (%) [(53.86±7.76) vs (39.88±9.07), (71.67±15.18) vs (48.86±6.71)] (P < 0.05); ③histological change in sciatic nerve: the number of sciatic axons in IcsⅡ group was higher than that of model group [(394.50±12.02) vs (160.50±9.19), (474.50±33.24) vs (289.50±6.36)] (P < 0.05), the same as its average optical density [(0.462±0.036) vs (0.455±0.004), (0.484±0.011) vs (0.462±0.016)] (P < 0.05); ④immunohistostaining: the average optical density of GAP-43 protein in IcsⅡ group was higher than that of model group [(0.175±0.012) vs (0.166±0.006), (0.196±0.010) vs (0.169±0.006)] (P < 0.05). The indexes above of model group and IcsⅡ group were lower than those of normal group and sham operation group(P < 0.05). There was no statistically significant difference between the normal group and the sham operation group (P > 0.05). Conclusion IcsⅡ can effectively improve the functional recovery, promote nerve regeneration after sciatic nerve crush injury in rats.

[Key words] Icarisid Ⅱ; Sciatic nerve; Nerve regeneration

周围神经病变恢复时间长、治疗难度大,临床常用有效的药物主要是神经生长因子,但由于副作用及价格因素导致其使用受限。我国传统中药淫羊藿提取液、淫羊藿苷、牛膝和银杏叶提取物具有促进周围神经再生作用,丹参可以促进坐骨神经组织神经生长因子的表达[1-2]。从传统中药中寻找价廉、副作用小、能长期应用的药物促进周围神经损伤后功能恢复和神经再生具有重要的临床意义。……

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