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川芎嗪对重型颅脑损伤后神经细胞凋亡及相关基因Bcl-2、Bax表达影响的实验性研究

Study on Effect of Ligustrazine(LZ) on Apoptosis of Neuron and Expression of Bcl-2 Bax Gene after Severe Brain Injury (SBI) in Rats

【作者】 仁增

【导师】 张跃康; 雷町; 王伟; 鞠延; 孙鸿;

【作者基本信息】 四川大学 , 外科学, 2007, 硕士

【摘要】 目的:探讨重型颅脑损伤后神经细胞凋亡、BCL-2、Bax的变化及川芎嗪对重型颅脑损伤后神经细胞凋亡及相关基因BCL-2、Bax表达的影响和脑神经元保护作用。方法:120只SD大鼠随机分为假手术组、模型组、(川芎嗪)治疗组各40只。治疗组和模型组采用Feeney模型造成脑部自由落体打击伤(重型),治疗组予以川芎嗪注射液(20mg/KG.d)及5%GNS(30ml/KG.d);模型组仅予5%GNS(30ml/KG.d):假手术组予以5%GNS(30ml/KG.d)。三组动物分别于7h、24h、72h、168h处死。取脑组织标本,用免疫组化法检测Bcl-2、Bax的表达及细胞凋亡数及三组间的差异。各时间窗对处死前动物进行神经功能评分。结果:(1)与假手术组相比,受损伤的两组大鼠脑组织中Bcl-2、Bax蛋白基因有明显阳性表达,具有统计学意义。(2)与模型组相比,Bcl-2蛋白表达在7小时、24小时与治疗组间无显著性差异(P>0.05),在72小时、168小时模型组的表达明显下降,与治疗组有明显差异,统计结果显示有显著性差异(P<0.05)。Bax蛋白基因在受损两组大鼠脑组织中有明显阳性表达,在治疗组中Bax蛋白阳性细胞数低于模型组,治疗组72小时、168小时与模型组之间有显著性差异(P<0.05)。(3)细胞凋亡数的变化:假手术组未见或少见TUNEL阳性细胞,而在受损两组中TUNEL阳性细胞表达明显增多,统计结果显示,模型组、治疗组与假手术组之间有显著性差异(P<0.05)。治疗组中TUNEL阳性细胞数在各时间窗均低于模型组,其中治疗组在72小时、168小时与模型组有显著性差异(P<0.05)。结论:(1)重型颅脑损伤后大鼠脑组织中存在神经细胞凋亡及细胞凋亡相关蛋白基因Bcl-2、Bax表达变化;(2)川芎嗪可能通过抑制Bax基因的表达,使促凋亡作用减弱,上调Bcl-2基因的表达,使抗凋亡作用增强,重新调整Bcl-2、Bax之间的平衡,减少神经细胞凋亡。(3)川芎嗪通过抑制细胞凋亡,减轻重型颅脑损伤后继发脑损害发挥脑神经保护作用。

【Abstract】 Objective: To investigate the expression of Bcl-2、Bax gen and apoptosis in the rat brain following severe brain injury(SBI) and evaluate neuroprotecting effects of Ligustrazine (LZ) .Methods: 120 SD rats were randomly assigned into three groups: pseudo-operation group,model group and (LZ)treatment group. Every group contained 40 rats. SBI was established according to Feeney’s method. The treatment group was administrated with LZ (20mg/KG.d) transperitoneally. Rats were killed at 7h、24h、72h、168h after SBI. TUNEL(terminal deoxynucleotide transferase mediated nick end labeling)and immunohistochemistry were used to detect apoptosis and Bcl-2、Bax expression in all the brain tissue.Result: (1)The immunoreactivity of Bcl-2 protein decreased in the penumbra after SBI,while the Bax protein expression increased significantly.(2)After SBI,the expression of Bcl-2 or Bax protein increased in model group compared with pseudo-operation group.the expression of Bcl-2 protein increased and Bax protein decreased significantly in LZ group compared with model group.(3)There are no or few the number of TUNEL positive cells in the pseudo-operation group, The number of TUNEL positive cells inthe treated(LZ) group is less than that of the model group.Conclusion: According to this date ,there are neuronal apoptosis and changeof Bcl-2、Bax protein expression. LZ could reduce the apoptosis of neuronafter severe brain injury through the improving express of Bcl-2 protein andinhibiting express of Bax protein,which might be one of mechanisms of LZtreating SBI.

【关键词】 重型颅脑损伤川芎嗪细胞凋亡Bcl-2Bax
【Key words】 severe brain injuryligustrazineapoptosisBcl-2Bax
  • 【网络出版投稿人】 四川大学
  • 【网络出版年期】2008年 04期
  • 【分类号】R285.5
  • 【被引频次】1
  • 【下载频次】197
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