参麦注射液对缺血性脑损伤大鼠海马c-fos基因表达的影响

背景c-fos基因为神经元细胞最常见的基因,其表达情况可作为受损神经细胞活性和反映性的标志物之一.目的从分子水平探讨缺血性脑损伤大鼠海马c-fos基因表达情况和参麦注射液的保护作用.设计随机对照实验.单位泸州医学院组织学与胚胎学教研室.材料实验于2002-01/03在泸州医学院组织学与胚胎学实验室完成.选择雄性Wistar大鼠30只,随机分为对照组、缺血组和治疗组,每组10只.方法缺血组和治疗组大鼠夹闭双侧颈总动脉30 min后再灌注1 h,建立缺血性脑损伤模型;治疗组在缺血30 min前腹腔注射参麦注射液2 mL/kg(由红参、麦冬等中药组成);缺血组不给药;对照组做假手术,不夹闭颈总动脉,也不给药.取大鼠脑海马组织制备石蜡切片,每只大鼠取1张切片,每组共随机统计100个神经元胞核.根据神经元胞核着色情况观察各组大鼠海马神经元c-fos基因的表达(+++为着色深,呈深棕色.++为着色较深,呈棕色者.+为着色较浅,呈浅棕色者.-为未着色).主要观察指标各组大鼠海马神经元c-fos表达.结果30只大鼠全部进入结果分析.缺血组大鼠海马内神经元c-fos基因的表达明显多于对照组[+++24,7个/视野,P＜0.05],而治疗组明显少于缺血组[+++13,24个/视野,P＜0.05].结论参麦注射液可减少缺血性脑损伤大鼠海马神经元c-fos基因的表达,具有对缺血性脑损伤组织神经细胞的保护作用.

Effect of shenmai injection on the expression of hippocampal c-fos gene of rats with ischemic cerebral injury

BACKGROUND: The c-fos gene is commonly expressed in neurons,which may act as one of the signs of activities and reflection of injured neural cells.OBJECTIVE: To investigate the expression of hippocampal c-fos gene of rats with ischemic cerebral injury and the protective role of shenmai injection at the molecular level.DESIGN: Randomized controlled study.SETTING: Department of Histology and Embryology, Luzhou Medical College.MATERIALS: The experiment was completed at the Department of Histology and Embryology, Luzhou Medical College from January to March 2002. Totally 30 male Wistar rats were randomly divided into control group, ischemia group and treatment group with 10 in each group.METHODS: Bilateral common carotid arteries of rats in the ischemia and treatment groups were splinted for 30 minutes and reperfused for 1 hour to establish models of ischemic cerebral injury. Rats in the treatment group were injected with 2 mL/kg of shenmai (constituted with hongshen, dwarf lilyturf tuber and other Chinese herbal medicines) 30 minutes before ischemia. Rats in the ischemia group were not treated with any drugs, and rats in the control group were treated with sham operation but without splinting common carotid artery and giving any drugs. Hippocampal tissue of rats was obtained to make paraffin sections. In every group, one section from each rat was taken at random. Totally 100 neurons of every group were counted. Expression of c-fos gene in hippocampal neuron was observed according to the nuclear color of neurons (+++ as dark-brown mark;++ as brown mark; + as light brown mark; - as no brown mark).MAIN OUTCOME MEASURE: c-fos expression of hippocampal neurons of rats in each group.RESULTS: Totally 30 rats entered the final analysis. Expression of c-fos gene in hippocampal neurons was significantly more in the ischemia group than that in the control group (+++: 24/visions, 7/visions, P ＜ 0.05); but that in the treatment group was less than that in the ischemia group (+++:13/visions, 24/visions, P ＜ 0.05).CONCLUSION: Shenmai injection can reduce the expression of c-fos gene in hippocampal neurons of rats with ischemic cerebral injury, and can protect neural cells of ischemic cerebral injured tissue.