作者:车彦军 林志国 沈 红作者单位:哈尔滨医科大学第一附属医院神经外科, 黑龙江 哈尔滨 150001 - ?$ w8 R6 K' @/ k8 u( M ( ^4 F% C2 |$ v7 x
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4 k4 g# N C, `3 @& W3 M- }3 o 【摘要】 目的 研究神经干细胞 (NSC) 移植到慢性海人酸癫(疒间)鼠海马CA3区后细胞的存活、迁移、分化及与宿主细胞的整合情况。 方法 将增强型绿色荧光 (EGFP) 标记的原代培养NSC移植到慢性癫(疒间)鼠的海马CA3区。分别在移植后第2、4、8、12周4个时间点取脑冷冻切片,在倒置荧光显微镜下观察移植细胞的存活和迁移。采用免疫荧光染色观察移植细胞的分化和整合情况。 结果 NSC在移植后2周未见迁移;移植后4周,可见移植细胞迁移到距移植区最近的齿状回;8周和12周,移植细胞可迁移到齿状回和海马各区。12周仍有大量移植细胞 (65 045.00 ± 881.72) 存活。NSC在移植区以分化为胶质细胞为主,在齿状回和海马各区以分化为神经元为主;γ-氨基丁酸 (GABA) 能神经元在齿状回门区和海马CA3区分化比例较高。突触素免疫荧光染色示移植细胞与宿主细胞间产生了有机的整合。 结论 NSC移植于慢性癫(疒间)鼠的海马CA3区后,能够迁移到齿状回和海马各区并长期存活,且可分化为神经元,特别是GABA能神经元,并能与宿主细胞有机整合。 5 O1 s* Q3 z+ _5 r' M 【关键词】干细胞 海马 移植 癫(疒间 细胞分化 细胞运动 2 B% g' g' e$ o" y# s Research of survival, migration, differentiation and integration of neural stem cells transplanted ! T2 t5 J1 d# a' W0 R4 |! o& T- E / ?2 D$ R0 K5 H; Q" O/ A. d: z' v9 Qto hippocampal CA3 of adult chronic epileptic rat 6 J0 W' ?+ p- p. {$ a$ [" U. V/ i4 u4 U( g5 [* j! H+ P
CHE Yanjun, LIN Zhiguo, SHEN Hong, et al ( Z5 `6 _5 s1 p+ Q) a0 G$ i% e) A% ^( d" |
Department of Neurosurgery, First Affiliated Hospital of Harbin Medical University, Harbin 150001, China y, v9 J! o: x& G
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Abstract: Objective To investigate into the survival, migration, differentiation and integration into the host of neural stem cells (NSCs) grafted in the hippocampal CA3 in adult chronic epileptic rats. Methods NSCs were primarily cultured and labeled with the enhanced green fluorescent protein (EGFP), and then were transplanted in hippocampal CA3 of adult chronic epileptic rats treated by KA. Cryostat sections were cut coronally through the hippocampi of the brains at weeks 2, 4, 8 and 12 after transplantation respectively. Survival and migration of the NSCs were detected directly under a phase contrast fluorescent microscope at various time points. Both the differentiation and integration into the host were determined by immunocytochemical fluorescent staining. Results Migration of the NSCs was not detected at the 2nd week after transplantation. However, at the 4th week, grafted cells migrated to dentate gyrus near the grafting area. At weeks 8 and 12, transplanted NSCs migrated to dentate gyrus and all areas of the hippocampus. Large numbers of the grafted cells were existent at week 12 (65045.00 ± 881.72). NSCs differentiated mainly into astrocytes in the grafted area, while into neuron in the hippocampus and dentate gyrus. GABAergic neurons differentiated from the grafted cells were detected in the dentate gyrus hilar and hippocampal CA3 zones. The integration of grafted cells into the host also could be detected by immunocytochemical fluorescent staining with antibodies of synaptophysin. Conclusion The NSCs after transplantation in hippocampal CA3 of adult chronic epileptic rats can migrate to the dentate gyrus and all areas of the hippocampus and survive well for long time. The grafted cells in the dentate gyrus and hippocampus can differentiate into neuron, especially GABAergic neuron, and integrate into the host.+ O. ^/ q n& l! P
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Key words: stem cells; hippocampus; transplantation; epilepsy; cell differentiation; cell movement 近年来,将胚胎海马细胞或神经干细胞 (NSC) 移植于致(疒间)早期癫(疒间)鼠的海马CA3区治疗癫(疒间)已经取得了一定的效果[1~3]。然而,将NSC移植于慢性癫(疒间)鼠海马C3区后移植细胞的变化目前国内外尚无报道,本研究即对移植细胞的存活、迁移、分化及与宿主的整合情况进行观察和分析。 ! G# B: P* w8 I% a( U 1 E6 g% g8 g2 B1 n1 j1 材料与方法 6 L; Z# I$ C$ x; B" E# R/ n0 R' |2 E9 F
1.1 材料与试剂 新生Wistar大鼠和成年大鼠由哈尔滨医科大学第二临床医学院动物室提供;重组Ⅱ型腺相关病毒 (rAAV2)-增强型绿色荧光蛋白 (EGFP) 购自本元正阳股份有限公司,基因组颗粒滴度:5 1011 v.g./ml;DMEM/F12购自Hyclone公司;B27和碱性成纤维细胞生长因子 (bFGF) 购自Gibco公司;鼠抗巢蛋白 (nestin) 多克隆抗体及海人酸 (KA) 购自sigma公司;鼠抗微管相关蛋白 (MAP) 多克隆抗体、兔抗γ-氨基丁酸 (GABA) 多克隆抗体、兔抗synapsin多克隆抗体、兔抗胶质纤维酸性蛋白 (GFAP) 多克隆抗体、罗丹明 (TRITC)-羊抗兔单克隆抗体及TRITC-羊抗鼠单克隆抗体等均购自武汉博士德公司。$ a) W: w& K6 Q1 A, o1 m3 L7 X; T# L+ @
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1.2 大鼠海人酸 (KA) 癫(疒间)模型的建立 取体质量200~250 g的雄性Wistar 大鼠,戊巴比妥40 mg/kg腹腔注射麻醉后,固定于动物立体定向仪 (DY-Ⅱ型,天津市医疗器械研究所),右侧侧脑室内注射KA 0.5 μg (0.5 μg/μl);具体靶点:AP = -3.7 mm,L = 4.1 mm,V = 4.5 mm;注射速度为0.2 μg/min,注射完毕后留针5 min。26只大鼠中24只 (92.3%) 于2周~2个月出现自发性癫(疒间)发作,将其纳入研究对象。" ~) r0 @/ e% H8 h% f4 b2 ^
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1.3 NSC的原代培养、鉴定和标记 取24 h内新生Wistar大鼠的海马,消化分离成单个细胞,按5 105/ml的细胞密度接种于NSC培养液 (DMEM/F12、bFGF 20 ng/ml、B27 2%),在5% CO2培养箱37 ℃培养。细胞先贴壁生长,3 d后NSC浮起并增殖成神经球。第7天进行传代,传1代后培养出中、小型神经球。取神经球用鼠抗nestin多克隆抗体进行免疫组化染色,NSC呈nestin阳性染色。将神经球消化吹碎成单个细胞后,用携带EGFP的rAAV2为载体,以病毒滴度 (MOI) 1 106转染,继续在5% CO2培养箱37 ℃培养11 d。! b3 u2 \5 v- x
# D( u' F; R; U& a: _3.6 分化的神经元与宿主之间的整合 整合的结构基础是相互之间形成突触,而突触素是突触小泡的特异性外侧膜蛋白,它可以作为轴突终末特异性标记物,与神经递质的释放直接相关,而神经递质又是神经元实现功能的介质,因此以突触素作为突触的特异性标志物既有生物学的专一性,又有生理学的相关性[12]。本研究结果表明:在移植细胞周围和胞体上有明显的宿主细胞突触素的表达,证明移植细胞和宿主细胞之间已形成结构上的整合。# f. b8 q: A, b1 Y" W
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[12] Hvalby O, Jensen V, Kao HT, et al. Synapsin-regulated synaptic transmission from readily releasable synaptic vesicles in excitatory hippocampal synapses in mice [J]. J Physiol, 2006; 571(1): 75-82.作者: dypnr 时间: 2015-5-22 19:22