神经组织细胞特异性蛋白在大鼠羊膜上皮细胞中的表达

背景:有证据表明羊膜上皮细胞能够表达神经系统细胞的几乎全部特异性抗原,且可以分泌多种神经营养因子及递质。若羊膜上皮细胞能够代替神经细胞,其神经营养作用必将为治疗神经推行性病变带来广阔前景。目的:检测神经组织细胞特异性抗原在大鼠羊膜上皮细胞中是否表达?设计:重复测量设计。单位:吉林大学第二临床医学院,吉林大学基础医学院组织与胚胎学教研室。材料:实验于2004-10/2005-10在吉林大学基础医学院组织与胚胎学教研室完成。选取清洁级孕12～14d的Wistar大鼠1只,将分离出的羊膜上皮细胞用于实验。小鼠抗大鼠神经元特异性抗原微管相关蛋白、星形胶质细胞特异性抗原胶质原纤维酸性蛋白、乙酰胆碱转移酶单克隆抗体、兔抗大鼠神经元特异性烯醇化酶和NT-3多克隆抗体(武汉博士德公司);大鼠抗大鼠Musashi抗体(日本庆应义塾大学岗野荣之教授惠赠)。方法:取孕12～14d的Wistar大鼠胎盘,剥离羊膜获得上皮细胞,在37℃、体积分数为0.05的CO2环境下,胰蛋白酶消化5min,加入DMEM/F12培养液,以5×109L-1的浓度接种于培养瓶中。培养3d后,细胞以1×108L-1的浓度接种于预先涂有多聚赖氨酸的直径35mm平皿中,用质量浓度为40g/L的多聚甲醛固定20min。采用免疫细胞化学染色方法对神经元特异性抗原微管相关蛋白、神经元特异性烯醇化酶、星形胶质细胞特异性抗原胶质原纤维酸性蛋白、乙酰胆碱转移酶在羊膜上皮细胞中的表达情况进行检测。主要观察指标:①大鼠羊膜上皮细胞不同培养时间的形态观察。②神经组织细胞特异性抗原在大鼠羊膜上皮细胞中的表达情况。结果:①大鼠羊膜上皮细胞不同培养时间的形态观察:羊膜上皮细胞培养24h后,细胞扁平呈成纤维细胞样。3～5d后,胞体饱满,核大而圆,核仁清晰,突起发达,并互相连成网状。②神经组织细胞特异性抗原在大鼠羊膜上皮细胞中的表达情况:培养4d后免疫细胞化学染色结果可见,羊膜上皮细胞表达Nestin、神经元特异性烯醇化酶、乙酰胆碱转移酶以及Musashi、神经元特异性抗原微管相关蛋白、星形胶质细胞特异性抗原胶质原纤维酸性蛋白。结论:羊膜上皮细胞与神经组织细胞具有一定的同源性,可望作为治疗神经系统疾病新的细胞来源。

Expression of specific proteins of neural cells in rat''''s cultured amniotic epithelial cells

BACKGROUND: It has been suggested that amniotic epithelial cells (AECs) express almost all of the markers of neural cell and secret a lot of neurotrophic factors and neurotransmitters. If AECs could substitute neural cells, its neurotrophic effect will bring promising prospect in treating neuron injuries and degenerative neural disease.OBJECTIVE: To detect specific proteins of neural cells in rat's cultured AECs.DESIGN: Repeated measurement design.SETTING: Second Clinical Medical College , Jilin University; Department of Histology & Embryology, School of Basic Medical Science, Jilin University.MATERIALS: This experiment was conducted at the Department of Histology & Embryology, School of Basic Medical Science, Jilin University from October 2004 to October 2005. The rat amniotic epithelial tissue was mechanically peeled from an embryonic 12 to 14days Wistar rats. Mouse anti Nestin was purchased from Chemicon Co.,and anti-ChAT rabbit anti-NSE and anti-NT-3 antibodies from Wuhan Boshide Company. Mouse anti-Musashi antibody was donated by Pro.Okano.METHODS: AECs were dissociated and purified from the amnion of pregnancy 12-14 day rats. AECs were treated with trypsin for 5 minutes,then cultured in DMEM/F12 medium at a humidified atmosphere of 0.05 volume fraction of CO2 in air at 37 ℃. Cells were inoculated at a concentration of 5×109 cells/L in culture flask. After 3 days, cells were inoculated onto poly-lysine-treated 35 mm culture Petri dish at a density of 1 × 108 cells/L for immunocytochemically staining. The cells were fixed with 40 g/L paraformaldehyde for 20 minutes. Immunocytochemical staining method was used to detect the expression of microtubule-associated protein-2 (MAP-2),neuron specific enolase(NSE), glial fibrillary acidic protein (GFAP) and choline acetyl transferase(ChAT).MAIN OUTCOME MEASURES: ① Morphological observation of rat'AECs at different culture time. ② Expression of specific protein of neural cells in rat' cultured AECs.RESULTS: ① After cultured for 24 hours, the AECs were flat and presented fibroblast-like morphology. 3 to 5 days later, cell bodies were well stacked; AECs had a big and round nucleus and were connected with each other by flourishing dendrites. ② Immunocytochemical staining results after culture for 4 days showed that AECs expressed Nestin, ChAT,NSE, Musashi, MAP-2, GFAP.CONCLUSION: AECs are homologous to neural cells in morphology, and it may be a new cell source to treat nervous system disease.