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胶质瘤是人类中最常见的恶性原发性颅内癌,尽管目前有多种治疗模式,仍然是人类恶性肿瘤中致死率较高的肿瘤之一[1]。胶质瘤具有独特的特征,包括肿瘤持续进展和强侵袭性及血管生成。其中,血管生成被认为是导致胶质瘤分级和恶性增加的原因[2]。另外, 胶质瘤还有无包膜浸润性生长特性,肿瘤的级别越高其浸润力越强,并且与肿瘤血管化相关[3]。肿瘤血管对肿瘤细胞的生长、增殖及运动过程中起着至关重要的作用。但是,在胶质瘤中,肿瘤血管对胶质瘤细胞的运动是否有促进作用,以及其中的分子机制并不是十分明确,因此,本实验通过体外分离培养胶质瘤血管内皮细胞,将其与胶质瘤细胞共培养,初步探讨肿瘤血管内皮细胞(GVEC)对胶质瘤细胞迁移能力影响及其作用机制。
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用上述实验方法分离胶质瘤血管内皮细胞, 将细胞接种于培养瓶中, 经培养后, 倒置显微镜观察,内皮细胞生长良好, 细胞贴壁生长,形态完整, 折光性强(见图 1)。
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将GVEC、VEC分别与CHG5细胞通过Transwell小室共培养,进行体外细胞迁移实验,将迁移至Traswell微孔滤膜下的细胞,结晶紫染色,随机选取10个视野,计数平均值,实验重复3次,结果显示,与GVEC共培养的CHG5细胞的迁移能力显著高于与VEC共培养的CHG5细胞和单独培养的CHG5细胞(P<0.05)。
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分别将与GVEC、VEC共培养的CHG5进行细胞骨架免疫荧光染色,结果显示,与GVEC共培养的CHG5细胞的微管蛋白在细胞核附近的微管蛋白较粗厚,呈圆环状,放射状排列;而与VEC共培养和单独培养的CHG5细胞微管蛋白弥漫分布呈细丝状(见图 2)。
分组 迁移能力 F P MS组内 CHG5 57.33±2.08 VEC+CHG5 54.00±3.00 1342.28 < 0.01 6.542 GVEC+CHG5 149.33±2.51*# q检验:与CHG5组比较*P < 0.05;与VEC+CHG5组比较#P < 0.05 表 1 不同培养的胶质瘤CHG5细胞迁移能力的比较(x±s)
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结果显示,与GVEC共培养的CHG5细胞Rac1和Cdc42的表达显著高于与VEC共培养的CHG5细胞和单独培养的CHG5细胞(P<0.05)(见表 2、图 3)。
分组 Rac1 Cdc42 CHG5 0.907±0.047 0.861±0.108 VEC+CHG5 0.977±0.011 1.113±0.013 GVEC+CHG5 1.156±0.021*# 1.444±0.065*# F 49.90 44.54 P < 0.01 < 0.01 MS组内 0.001 0.006 q检验:与CHG5组比较*P < 0.05;与VEC+CHG5组比较#P < 0.05 表 2 不同培养的胶质瘤CHG5细胞Rac1、Cdc42蛋白表达的比较(x±s)
肿瘤血管内皮细胞对胶质瘤细胞迁移能力影响的机制研究
Study on the mechanism of the tumor vascular endothelial cells influencing the migration ability of glioma cells
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摘要:
目的探讨肿瘤血管内皮细胞(GVEC)在胶质瘤肿瘤细胞迁移过程中的作用。 方法分别培养正常血管内皮细胞(VEC)及胶质瘤GVEC,在体外与胶质瘤细胞株(CGH5)共培养,并以单独培养的CHG5细胞作为对照。通过Transwell培养板迁移实验分析GVEC对CHG5细胞迁移能力的影响;免疫荧光染色观察GVEC对CHG5细胞骨架的影响;Western blotting检测共培养后CHG5细胞Rac1和Cdc42表达的变化。 结果CHG5与GVEC共培养后迁移能力显著高于与VEC共培养和单独培养的CHG5细胞(P < 0.05)。细胞骨架免疫荧光染色显示,与GVEC共培养的CHG5细胞的微管蛋白形态发生改变,细胞核附近微管蛋白较粗厚,呈圆环状,放射状排列。Western blotting结果表明,与GVEC共培养的CHG5细胞Rac1和Cdc42表达明显增高(P < 0.05),但与VEC共培养的CHG5细胞表达无明显变化(P>0.05)。 结论肿瘤细胞血管在胶质瘤细胞迁移的过程中至关重要,GVEC可以通过改变细胞微管蛋白结构,并上调Rac1和Cdc42蛋白的表达,促进胶质瘤细胞的迁移运动。 Abstract:ObjectiveTo investigate the role of tumor vascular endothelial cells (GVEC) in the migration of glioma tumor cells. MethodsThe vascular endothelial cells (VEC) and GVEC were isolated, and co-cultured with glioma cell line CGH5 in vitro, respectively.The CHG5 cells were set as the control.The effects of GVEC on the migration ability and cytoskeleton of CHG5 cells were analyzed using the Transwell migration assay and immunofluorescence staining, respectively.The expression levels of Rac1 and Cdc42 in CHG5 cells after co-culture were detected using Western blotting. ResultsThe migration ability of CHG5 co-cultured with GVEC was significantly higher than that in CHG5 co-cultured with VEC and CHG5 culture alone (P < 0.05).The results of cytoskeleton immunofluorescence staining showed that the morphology of tubulin in CHG5 cells changed, and the tubulin was thick, circular and radial arrangement after the CHG5 cells were co-cultured with GVEC.The results of Western blotting showed that the expression levels of Rac1 and Cdc42 in CHG5 cells significantly increased after the CHG5 cells were co-cultured with GVEC (P < 0.05), while no obvious change of the expression levels of Rac1 and Cdc42 in CHG5 cells was found after the CHG5 cells were co-cultured with VEC (P>0.05). ConclusionsThe role of tumor cell vascularity is crucial in the migration of glioma cells.The GVEC can promote the migration of tumor cells by changing the cellular tubulin structure, and up-regulating the expression levels of Rac1 and Cdc42 proteins. -
Key words:
- glioma /
- tumor vascular endothelial cell /
- cell migration
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表 1 不同培养的胶质瘤CHG5细胞迁移能力的比较(x±s)
分组 迁移能力 F P MS组内 CHG5 57.33±2.08 VEC+CHG5 54.00±3.00 1342.28 < 0.01 6.542 GVEC+CHG5 149.33±2.51*# q检验:与CHG5组比较*P < 0.05;与VEC+CHG5组比较#P < 0.05 表 2 不同培养的胶质瘤CHG5细胞Rac1、Cdc42蛋白表达的比较(x±s)
分组 Rac1 Cdc42 CHG5 0.907±0.047 0.861±0.108 VEC+CHG5 0.977±0.011 1.113±0.013 GVEC+CHG5 1.156±0.021*# 1.444±0.065*# F 49.90 44.54 P < 0.01 < 0.01 MS组内 0.001 0.006 q检验:与CHG5组比较*P < 0.05;与VEC+CHG5组比较#P < 0.05 -
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