摘要
目的:观察 X 线照射体外共培养的内皮细胞与星形胶质细胞后血管生成素-1(Ang-1)、血管生成素-2(Ang-2)、受体Tie-2及血管内皮生长因子(VEGF)表达的变化,探讨VEGF、Ang-1、Ang-2及Tie-2和放射性脑损伤( RBI)的关系。方法利用Transwell培养板,将小鼠脑微血管内皮细胞株bEnd.3与星形胶质细胞共培养。以5、10、20、30 Gy剂量的X线照射共培养的内皮细胞与星形胶质细胞后继续培养24 h,并设正常对照组即未照射组。 Western印迹法检测细胞VEGF、Ang-1、Ang-2及Tie-2蛋白的表达情况。结果5、10、20、30 Gy剂量组VEGF的蛋白表达均高于对照组[(1.71±0.11)、(2.03±0.05)、(2.20±0.06)、(2.19±0.08)比(1.26±0.10),P<0.05];5、10、20、30 Gy剂量组Ang-1的蛋白表达均低于对照组[(2.27±0.07)、(2.28±0.06)、(2.01±0.05)、(1.54±0.08)比(2.46±0.04),P<0.05];5、10、20、30 Gy剂量组Tie-2的蛋白表达均低于对照组[(2.40±0.10)、(2.47±0.06)、(1.05±0.09)、(1.00±0.08)比(4.80±0.07),P<0.05];5 Gy和10 Gy剂量组Ang-2的蛋白表达均高于对照组[(2.10±0.07)、(2.43±0.08)比(1.69±0.05), P<0.05];20 Gy和30 Gy剂量组 Ang-2的蛋白表达均低于对照组[(1.12±0.10)、(1.21±0.04)比(1.69±0.05),P<0.05]。结论 X线能够诱导体外共培养的内皮细胞与星形胶质细胞VEGF、Ang-1、Ang-2及Tie-2的蛋白表达水平发生不同的改变,而这些蛋白水平的不同改变可能与RBI的微血管损伤相关。
Objective To explore the possible relationship between angiopoietin-1 ( Ang-1 ) , angiopoietin-2 (Ang-2), Tie-2 and vascular endothelial growth factor (VEGF) and radiation brain injury (RBI) and detect the expressions of VEGF , Ang-1, Ang-2 and Tie-2 in co-cultured endothelial cells and astrocytes after an irradiation of X-ray.Methods Murine brain microvascular endothelial cells bEnd.3 and astrocytes were co-cultured in a Transwell culture plate and then exposed to X-ray at various doses (5, 10, 20 and 30 Gy) and cultured for 24 hours.The group without radiation acted as a control.Western blot was used to detect the expressions of VEGF , Ang-1, Ang-2 and Tie-2.Results As compared with the control group, the expression of VEGF increased in 5, 10, 20 and 30 Gy dose groups [(1.71 ±0.11), (2.03 ± 0.05), (2.20 ±0.06), (2.19 ±0.08) vs (1.26 ±0.10), P〈0.05];the expression of Ang-1 decreased in 5, 10, 20 and 30 Gy dose groups [(2.27 ±0.07), (2.28 ±0.06), (2.01 ±0.05), (1.54 ±0.08) vs (2.46 ±0.04), P 〈0.05]; the expression of Tie-2 decreased in 5, 10, 20 and 30 Gy dose groups [(2.40 ±0.10), (2.47 ±0.06), (1.05 ±0.09), (1.00 ±0.08) vs(4.80 ±0.07), P〈0.05]; the expression of Ang-2 increased in 5 Gy and 10 Gy dose groups [(2.10 ±0.07), (2.43 ±0.08)vs (1.69 ± 0.05), P〈0.05] while decreased in 20 Gy and 30 Gy dose groups [(1.12 ±0.10), (1.21 ±0.04)vs (1.69 ±0.05), P 〈0.05].Conclusion X-ray could differentially affect the expressions of VEGF , Ang-1, Ang-2 and Tie-2 in co-cultured endothelial cells and astrocytes.And the differential expressions of VEGF, Ang-1, Ang-2 and Tie-2 may be related with microvascular injury in RBI.
出处
《中华医学杂志》
CAS
CSCD
北大核心
2014年第23期1815-1819,共5页
National Medical Journal of China
基金
国家自然科学基金(81271386)