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大鼠羊膜上皮细胞植入损伤脊髓后的存活与迁移
引用本文:王大伟,孟晓婷,娄小倩,陈东,曲得伟,薛辉. 大鼠羊膜上皮细胞植入损伤脊髓后的存活与迁移[J]. 中国组织工程研究与临床康复, 2007, 11(15): 2994-2996,3000
作者姓名:王大伟  孟晓婷  娄小倩  陈东  曲得伟  薛辉
作者单位:1. 吉林大学第二临床医学院,吉林省长春市,130021
2. 吉林大学基础医学院组织与胚胎学教研室,吉林省长春市,130021
3. 广东医学院组织与胚胎学教研室,广东省湛江市,524023
基金项目:吉林大学校科研和教改项目
摘    要:背景:有研究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,如果羊膜上皮细胞用于代替神经细胞,其神经营养作用必将为治疗脊髓损伤和神经退行性病变带来广阔前景。目的:观察大鼠羊膜上皮细胞移植入损伤脊髓后的存活、迁移及分泌情况。设计:观察实验。单位:吉林大学基础医学院组织与胚胎学教研室。材料:选用1只孕12~14d及18只成年雄性Wistar大鼠,体质量300~350g,由吉林大学实验动物中心提供。免疫组织化学染涂色试剂:小鼠抗大鼠溴核苷脱氧嘧啶单克隆抗体购自Sigma公司;兔抗大鼠神经营养素-3多克隆抗体和兔抗大鼠BDNF多克隆抗体(博士德公司);SP免疫组织化学染色试剂盒购自迈新公司。方法:实验于2005-07/10在吉林大学基础医学院组织与胚胎学教研室完成。①大鼠脊髓损伤模型的建立:大鼠麻醉后,分离皮下组织肌肉,用咬骨钳咬除棘突及椎板,暴露脊髓,用止血钳以一扣力度钳夹脊髓全截面3min,青霉素涂撒创口,缝合肌肉皮肤。术中根据需要吸入乙醚麻醉,1周后移植。②羊膜上皮细胞的获取和培养:取孕12~14d的Wistar大鼠胎盘剪成1mm×1mm×1mm的组织块,经消化培养后,机械吹打使其成为单细胞悬液接种于培养瓶中。③羊膜上皮细胞移植入损伤脊髓:切开原创口,暴露损伤脊髓,将5μL羊膜上皮细胞悬液以1×1012/L的浓度用微量注射器在距损伤处上缘3mm处注入,注入时间为3min,停针5min后缓慢拔出,缝合肌肉、皮肤。④取材及免疫组织化学分析:分别于羊膜上皮细胞移植入1,3周后取材,即室温下40g/L多聚甲醛灌流固定后在PBS缓冲液中浸泡20min,4℃下一抗孵育过夜,二抗生物素化抗小鼠或兔IgG37℃孵育20min,辣根过氧化物酶标记的三抗于37℃孵育20min,0.2g/L二甲基联苯氨显色或AEC显色。主要观察指标:羊膜上皮细胞移植入损伤脊髓1,3周后的存活、迁移及分泌情况。结果:羊膜上皮细胞移植1周后,羊膜上皮细胞仍多聚于软脊膜下,可见阳性细胞核;羊膜上皮细胞移植3周后,羊膜上皮细胞迁移更加广泛,中央管及周围灰质中有大量阳性细胞;同时可观察到在损伤脊髓中移植的羊膜上皮细胞能够表达神经营养素3,表现为显红色的阳性细胞和脑源性神经营养因子。结论:羊膜上皮细胞在大鼠损伤脊髓内能够至少存活3周并有广泛迁移,此外还能够分泌神经营养因子脑源性神经营养因子和神经营养素3。

关 键 词:羊膜  上皮细胞  脊髓损伤  细胞存活
文章编号:1673-8225(2007)15-02994-03
收稿时间:2006-09-28
修稿时间:2007-02-15

Survival and migration of amniotic epithelial cells after transplantation into the injured spinal cord
Wang Da-wei,Meng Xiao-ting,Lou Xiao-qian,Chen Dong,Qu De-wei,Xue Hui. Survival and migration of amniotic epithelial cells after transplantation into the injured spinal cord[J]. Journal of Clinical Rehabilitative Tissue Engineering Research, 2007, 11(15): 2994-2996,3000
Authors:Wang Da-wei  Meng Xiao-ting  Lou Xiao-qian  Chen Dong  Qu De-wei  Xue Hui
Abstract:BACKGROUND: It has been suggested that amniotic epithelial cells (AECs) express almost all the markers of neural cell and secrete biologically active neurotrophins such as brain derived neurotrophin factor (BDNF) and neurotrophin-3 (NT3).If AECs can substitute neural cells, its neurotrophic effect will bring expansive prospect in treating spinal cord injuries and degenerative neural disease.OBJECTIVE: To observe the survival, migration and secretory function of AECs after transplanted into the injured spinal cord.DESIGN: An observational experiment.SETTING: Department of Histology and Embryology, School of Basic Medical Science, Jilin University.MATERIALS: Embryonic rat of 12-14 days (n =1) and adult Wistar rats (n =18, 300-350 g) were provided by the Experimental Animal Center of Jilin University. Immunohistochemical reagents: Mouse anti-rat BrdU monoclonal antibody was bought from Sigma Company. Rabbit anti-rat NT3 polyclonal antibody and rabbit anti-rat BDNF polyclonal antibody were bought from Boster Company. SP immunohistochemistry reagents were purchased from Maixin Company.METHODS: The experiment was made in the Department of Histology and Embryology, Basic Medical Science of Jilin University from July to October 2005. ① Wistar rats were anesthetized by intraperitoneal injection of chloral hydrate, subcutaneous tissue and muscle were separated, spinous process and lamina of vertebra were removed by bone ribbing rongeur. to expose the spinal cord. The spinal cords were clamped at the twelfth thoracic vertebra (T12) for 3 minutes.After surgery, the wounds were smeared with penicillin G, then muscle and skin were sutured. The rats were anesthetized by inhaling ether if necessary. ② Obtaining and culture of AECs: Amniotic membrane was peeled from the placenta of a pregnant Wistar rat of 12-14 days. The amnictic membrane was dissected into small pieces of 1 mm×1 mm×1 mm, then digested and cultured, and mechanically made into single cell suspension, finally plated in bottles. ③ Transplantation of AECs into injured spinal cord: The initial wound was slit and injected with 5 μL Brdu labeled AECs (1×1012 L-1) to the exposed injured spinal cord at 3.0 mm anterior to the injured site. The injections were made at a rate of 5 μL per 3 minutes with a microsyringe. The syringe was slowly pulled out after 5 minutes, then muscle and skin were sutured. ④ Sampling and immunohistochemical analysis: Three animals were sacrificed at 1 week and the other three at 2 weeks postoperatively. The sections were fixed with 40 g/L paraformaldehyde in phosphate buffer solution (PBS) for 20 minutes at room temperature, followed by incubation with primary antibodies at 4 ℃ overnight. The samples were treated with secondary antibodies, biotinylated anti-mouse or rabbit immunoglobulin (IgG) at 37 ℃ for 20 minutes; Followed by incubation of horseradish peroxidase (HRP) labeled third antibodies at 37 ℃ for 20 minutes, then stained with 0.2 g/L diaminobenzidine (DAB) or AEC.MAIN OUTCOME MEASURES: Survival, migration and expression of AECs after transplanted into the injured spinal cord. RESULTS: After transplantation, most of the AECs gather beneath the pia mater of injured spinal cord at 1 week. But they migrated more extensively and many positive nuclear cells (brown) were observed in the center cannel and surrounding gray mater. Meantime, it was also detected that the transplanted AECs could express NT3 (positive cells stained as red) and BDNF in the injured spinal cord.CONCLUSION: AECs could survive for at least 3W after transplanted into the injured spinal cord of adult rats and could migrate widely; Furthermore, they could secrete neurotrophic factors such as NT-3 and BDNF.
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