背景:观察缺氧状态下脑血管内皮细胞的血管内皮细胞生长因子表达及细胞超微结构变化,可为从细胞和分子水平认识血管生成及其相关的细胞因子参与缺血性脑血管疾病的病变过程.目的:构建分离微血管段体外培养人脑微血管内皮细胞的方法,并观察血管内皮细胞生长因子基因表达与细胞超微结构变化.设计:随机对照的技术方法研究.单位:一所军区总医院的神经外科,一所大学医院的神经外科.对象:2002年沈阳军区总医院神经外科脑动静脉畸形患者18例(SpetzlerⅡ～Ⅲ级),全部病例术前均经全脑血管造影证实.取材于手术中切除的完整脑动静脉畸形新鲜标本周围粘连的新鲜脑组织,采用匀浆、过滤和酶消化技术分离微血管内皮细胞.将在培养瓶内生长良好的细胞分成缺氧2,4,8 h组和对照组4组,每4瓶为1组.方法:缺氧条件模拟:体积分数0.95 N2,体积分数0.05 CO2.免疫组化方法检测细胞中第八因子相关抗原(FⅧ-RA)表达.选用RT-PCR技术观察每组内皮细胞血管内皮细胞生长因子mRNA表达,同时以ELISA方法检测每组细胞上清液中血管内皮细胞生长因子蛋白含量,透射电镜观察细胞超微结构的变化.主要观察指标:对照组和各缺氧组血管内皮细胞中血管内皮细胞生长因子mRNA表达和细胞上清液中血管内皮细胞生长因子蛋白含量,以及细胞超微结构的变化.结果:相差显微镜下,培养的活细胞具有单层"卵石样"排列的典型特征,90%以上的细胞为FⅧ-RA阳性染色.缺氧4 h细胞血管内皮细胞生长因子mRNA和蛋白表达为0.98±0.19,(180.77±20.15)ng/L,较对照组显著升高[0,(26.20±6.33)ng/L,P＜0.01],8 h后表达下调[0.35±0.07,(31.68±8.34)ng/L],并出现线粒体肿胀、内质网扩张及溶酶体多囊泡形成.结论:采用分离微血管段方法培养人脑血管内皮细胞,操作简便易行,细胞纯度可靠.缺血缺氧早期血管内皮细胞生长因子表达不足以维持细胞超微结构完整,随缺氧时间延长细胞可发生损伤性变化.%BACKGROUND: The observation of vascular endothelial growth factor gene expression of cerebrovascular diseases and ultrastructure of cells may be helpful to understand angiogenesis and its relative cellular factors involved in the pathogenesis at cellular and molecular levels. OBJECTIVE: To investigate the method of culture of human cerebral cap illary endothelial cell by separation of capillary fragment in vitro, and to ob serve vascular endothelial growth factor gene expression and ultrastructure of cells. DESIGN: A randomized controlled research on technique and method. SETTING: The neurosurgery department of a general hospital of a military area command of Chinese PLA and the neurosurgery department of a college hospital. PARTICIPANTS: Eighteen patients with arteriovenous malformation of brain(Spetzler Ⅱ-Ⅲ grade), as confirmed by aortocranial angiography before operation, in the Department of Neurosurgery, General Hospital of Shenyang Military Area Command of Chinese PLA were included. The material was obtained from fresh integrated specimen of arteriovenous malfor mation of brain with surrounding fresh brain tissues during the opera tion. Capillary endothelial cell was separated by homogenate, filtration and enzymatic digestion techniques. Cells grew well in culture flask and were divided into 4 groups(hypoxia state for 2, 4, 8 hours groups and control group). Each group contained four flasks.METHODS: Simulation of anoxia condition: volume faction 0.95 N2 and volume fraction 0.05 CO2. Expression of factor Ⅷ related antigen in cells was detected by immunohistochemistry. mRNA expression of vascular endothelial growth factor on endothelial in every group was observed by RT-PCR, protein content of vascular endothelial growth factor in supernatant detected by enzyme-linked immunoadsordent assay, and cellular ultrastructural change observed by transmission electron microscopy.MAIN OUTCOME MEASURES: mRNA expression of vascular endothelial growth factor on endothelial cell and protein content of vascular endothelial growth factor in supernatant in control group and every hypoxia groups; cellular ultrastructural changes.RESULTS: Under phase contrast microscope, cultured living cells had mono-layer pebble-like typical character. More than 90% of were factor Ⅷrelated antigen(FⅧ-RA) staining positive. mRNA and protein expression of vascular endothelial growth factor in hypoxia 4 hours group was 0.98 ±0. 19,( 180. 77 ± 20. 15) ng/L, which was significantly higher than in control group [0, (26. 20 ± 6.33) ng/L, P ＜ 0.01 ]. Eight hours later, expression decreased [(0. 35 ±0.07), (31.68 ±8.34) ng/L]; swollen mitochondrion, dilated endoplasmic reticulum, and lysosome vesiculation were found.CONCLUSION: Humane cerebral capillary endothelial cell can be cultured by separation of capillary fragment, which is easy to operate and the cellular purity is reliable. In the early stage of ischemia and hypoxia, expression of vascular endothelial growth factor is not enough to maintain cellular ultrastructure integrity. Cells may be injured along with the prolong of hypoxia.Zhao MG, Tang T, Gao YZ, Pu PY, Wei XZ. Culture of human cerebral capillary endothelial by separation of capillary fragment and the observation of vascular endothelial growth factor gene expression and cell ultrastructure. Zhongguo Linchuang Kangfu 2005; 9(21):211-3 (China) [www. zglckf. com]
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