三七总皂甙对新生鼠窒息致脑损伤时细胞凋亡及HO-1表达的影响
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祝大丽等三七总皂甙对新生鼠窒息致脑损伤时细胞凋亡及HO一1表达的影响第13期
三七总皂甙对新生鼠窒息致脑损伤时细胞凋亡及HO一1表达的影响①
祝大丽何平② 朱萍李秀云 王雪 王瑞娇
昆明医科大学第二附属医院儿科(云南昆明) 650101
中国图书分类号R332 文献标识码A 文章编号1001.4411(2015)13-2083-04;doi:10.7620/zgfyb ̄J.issn-1001—44l1.2015.13.42 【摘要】 目的:探讨三七总皂甙(TPNS)对新生鼠窒息致脑损伤时脑细胞凋亡率及血红素氧合酶一1(HO-1)表达的
影响。方法:取7日龄新生sD大鼠88只,随机分为对照组(I组)、常压窒息模型+生理盐水组(Ⅱ组)和常压窒息模型+ TPNS干预组(Ⅲ组),对照组8只,余每组4O只。将新生鼠分别放入55 ml的磨口瓶中(瓶中装5g钠石灰),待新生鼠安静后,
Ⅱ组及Ⅲ组紧塞瓶盖0.5 h,取出后复氧2 h,窒息后Ⅲ组立即腹腔注射TPNS 100 mg・kg~、II组腹腔注射相同容积生理盐水,
以后每隔12 h腹腔注射1次,注射后放回母鼠身边继续喂养,分别在窒息后6 h、24 h、48 h、72 h和7天处死;I组放入55 IIll
磨口瓶中0.5 h,不盖瓶盖,取出后复氧2 h,放回母鼠身边继续喂养,6 h后全部处死。用TUNEL法测定脑细胞凋亡率,行免 疫组化检测HO一1。结果:①Ⅱ组和Ⅲ组细胞凋亡率高于对照组(P<O.05),在48 h达高峰。②Ⅲ组(除6 h组外)细胞凋亡率
表达水平明显低于Ⅱ组,差异有统计学意义(P<0.05)。③II组及Ⅲ组HO一1高于对照组(P<0.05),在24 h达高峰。④Ⅲ组
HO一1的表达高于Ⅱ组(P<0.05)。结论:TPNS可降低新生鼠窒息致脑损伤时脑细胞凋亡率的表达(P≤0.01),增加HO-1蛋
白的表达,对窒息导致的新生鼠缺氧缺血性脑损伤具有明显保护作用。 【关键词】 新生鼠窒息三七总皂甙细胞凋亡率血红素氧合酶一1
Effect of total panax notoginseng saponin on cell apoptosis and HO-1 expression in
rats with brain injury induced by asphyxia
ZHU Da一 ,HE ,ZHU P ng,et a1.Department ofPediatrics,the Second Affiliated Hospital ofKunming Medical
Univemity。Kunming 650101。Yunnan。China
[Abstract] Objective:To explore the effect of total panax notoginseng saponin(TPNS)on brain cell apoptotic rate and heme oxy-
genase-1(HO-1)expression in rats with brain injury induced by asphyxia.Methods:Eighty-eight 7一day一0ld neonatal SD rats were se-
lected and randomly divided into control group(group I,8 rats),ordinary pressure asphyxia model+saline treatment group(groupⅡ,4O rats),and ordinary pressure asphyxia model+TPNS intervention group(groupⅢ,40 rats).The neonatal rats were put nto bottles with ground stopper(55 ml,containing 5 g soda lime),when the rats were quiet,the caps of bottles in group 11 and group 11I ̄,ere plugged for
half an hour,then the neonatal rats were treated with re-oxygenation for two hours,the rats in groupⅢwere immediately treated with intrap-
eritoneal injection of TPNS(100 mg・kg ),the rats in group I1 were treated with intraperitoneal injection of normal saline of the sanle vol-
ume,the injection was repeated every 12 hours,after infection,the neonatal rats were put back to the maternal rats,then they were put to death at 6,24,48,72 hours and 7 days,respectively;the rats in group 1 were put into bottles with ground stopper(55 m1)for half an
hour,then they were treated with re-oxygenation for two hours and put back to the maternal rats,after six hours,they were put to death. TUNEL method was used to detect cell apoptotic rate,HO-1 expression was detected by immunohistochemistry.Results:The rates of cell apoptosis in group II and groupⅢwere statistically significantly higher than that in group I(P<0.05),which peaked at 48 hours.The
rate of cell apoptosis in groupⅢ(except at 6 hours)was statistically significantly lower than that in groupⅡ(P<0.05).HO-1 expres-
sion levels in group II and group 111 were statistically significantly higher than that in group I(P<0.05),which peaked at 24 hours.
HO-I expression level in group 111 was statistically significantly higher than that in group II(P<0.05).Conclusion:TPNS can reduce
the rate of brain cell apoptosis and increase the expression of HO-1 in neonatal rats with brain injury induced by asphyxia,which has signifi— cant protective effect in neonatal rats with hypoxic ischemic brain damage induced by asphyxia.
[Key words] Neonatal rat;Asphyxia;Total panax notoginseng saponin;Cell apoptotic rate;Heme oxygenase-1
新生儿窒息的本质是缺氧…,窒息缺氧对机体
可造成全身多脏器损害,其中脑对缺氧最敏感,缺氧
主要引起脑水肿及神经元的坏死。本研究通过建立新
生SD大鼠常压窒息模型观察三七总皂甙(TPNS)
对新生鼠窒息致脑损伤时脑细胞凋亡率及血红素氧合
①云南省科技厅面上基金资助项目[2010ZC128] ②通讯作者E-mail:kedeng1990@163.corn 酶一1(HO一1)的影响。
1材料与方法
1.1材料7日龄体重12~15 g健康sD大鼠88只
(雌雄不拘),由昆明医科大学实验动物中心提供。
TPNS由昆明中药厂生产。原位末端标记(TUNEL)
检测试剂盒购自南京凯基生物科技公司,HO一1试剂
盒购自武汉博士德生物公司。 1.2方法
1.2.1分组将新生7日龄sD鼠88只分为:①I
组(对照组,8只);②I1组(窒息+NS组,40只),
包括窒息后6 h、24 h、48 h、72 h和7天(即II 1、
Ⅱ2、Ⅱ3、Ⅱ4、Ⅱ5组);③m组(窒息+TPNS组,
40只),包括窒息后6 h、24 h、48 h、72 h和7天
(即m1、m2、Ⅲ3、Ⅲ4、HI5组)。
1.2.2模型制备将SD鼠放入55 n l的磨口瓶中
(瓶内放5 kg钠石灰),等动物安静后塞紧瓶盖,密
闭30 min,取出后立即复氧2 h。Ⅲ组窒息后即刻腹
腔注射TPNS 100 mg・kg~,U组腹腔注射相同容积
的生理盐水,以后每隔12 h重复腹腔注射一次,注
射后放回母鼠身边继续喂,分别于窒息后6 h、24 h、
48 h、72 h和7天处死小鼠。I组放入55 ml磨口瓶
中0.5 h,不盖瓶盖,取出后复氧2 h,放回母鼠身边
继续喂养,6 h后全部处死。小鼠处死后快速剥离脑
组织,用冰生理盐水冲洗后浸入4%多聚甲醛中固定
12~48 h,做石蜡包埋切片,行TUNEL法测定脑细
胞凋亡率,用免疫组化检测HO一1。
1.2.3结果判断每张切片随机取5个视野,经400
倍目镜计数阳性细胞数(细胞核呈现棕黄色为阳性细
胞),切片边缘视野不计,以排除“边缘效应”的干扰。
阳性指数以阳性细胞占所有细胞的百分率(%)表示。
1,3统计学方法 采用SPSS 17.0统计软件进行统
计学处理,结果用(E ̄s)表示,组内比较采用 检
验,组问两两比较采用配对样本t检验,以P<0.05
为差异有统计学意义。
2结果
2.1卡方检验显示 ①Ⅱ组各时间点细胞凋亡率表
达水平不同,差异有统计学意义( =55.305,P<
0.001),见表1。②Ⅲ组各时间点细胞凋亡率表达水 中国妇幼保健2015年第3O卷
平不同,差异有统计学意义( =67.187,P<
0.001),见表2。③1I组各时间点HO一1蛋白的表达
不同,有统计学差异( =18.717,P<0.01),见表