亚硒酸钠对肺癌细胞迁移和血管生成的影响及其机制探究

Effects of sodium selenite on migration and angiogenesis of lung cancer cells and its mechanism

目的:探讨亚硒酸钠(SS)对人非小细胞肺癌H520和A549细胞活力、迁移和血管形成模式的影响,并初步阐明其作用机制。方法:体外培养H520细胞、A549细胞及人脐静脉内皮细胞(HUVEC),分为对照组(0μmol/L SS)、低剂量组(5μmol/L SS)、中剂量组(10μmol/L SS)和高剂量组(20μmol/L SS)。采用CCK-8法检测各组细胞活力,计算半抑制浓度(IC_(50));细胞划痕实验检测各组细胞划痕愈合率;Transwell小室实验检测各组细胞迁移能力;血管形成实验检测亚硒酸钠对HUVEC血管管腔、肺癌细胞血管生成拟态管腔及肺癌细胞和HUVEC共同形成的“马赛克”血管管腔的影响;化学发光法检测各组肺癌细胞上清血管内皮生长因子(VEGF)表达量;RT-qPCR法检测VEGF、血管内皮生长因子受体2(VEGFR2)及血管紧张素Ⅱ(Ang Ⅱ)的mRNA表达水平;Western blot法检测H520和A549细胞中VEGF、p-PI3K和p-Akt蛋白水平。结果:SS处理48 h对HUVEC、A549细胞和H520细胞的IC_(50)值分别为6.762、9.003和7.356μmol/L。与各自对照组相比,SS处理48 h各组细胞划痕愈合率均降低(P<0.01);HUVEC中,中、高剂量组迁移细胞数减少(P<0.01);肺癌细胞系中,SS处理后各组迁移细胞数均减少(P<0.01);高剂量SS组VEGF、VEGFR2和Ang Ⅱ的mRNA水平表达量均降低(P<0.05,P<0.01);在H520细胞中,SS处理组VEGF、p-PI3K和p-Akt蛋白水平均降低(P<0.05,P<0.01)。结论:亚硒酸钠可抑制HUVEC、H520细胞及A549细胞活力及迁移,抑制肺癌细胞血管生成拟态及马赛克血管的形成,其机制可能与抑制PI3K-Akt信号通路激活及调控VEGF有关。

AIM:To investigate the effects of sodium selenite(SS)on viability,migration and angiogenesis of human non-small-cell lung cancer(NSCLC)H520 and A549 cells.METHODS:The H520 cells,A549 cells,and human umbilical vein endothelial cells(HUVEC)were divided into control group(0μmol/L SS),low dose group(5μmol/L SS),middle dose group(10μmol/L SS),and high dose group(20μmol/L SS).Cell viability was assessed using the CCK-8 assay,and the half-maximal inhibitory concentration(IC_(50))was calculated.Cell migration and invasion abilities were determined through wound healing and Transwell assays.The regulatory effects of SS on angiogenesis,vasculogenic mimicry and"mosaic"vascular formation between HUVEC and NSCLC cells were detected using vessel forming assays.The expression of vascular endothelial growth factor(VEGF)in the supernatant of lung cancer cells in each group was detected using chemiluminescence.RT-qPCR was used to assess the mRNA expression of VEGF,vascular endothelial growth factor receptor 2(VEGFR2)and angiotensin Ⅱ(Ang Ⅱ).Western blot was used to examine the protein levels of VEGF,p-PI3K,and p-Akt in H520 and A549 cells.RESULTS:The IC_(50) values of SS to HUVEC,A549 cells and H520 cells for 48 h were 6.762,9.003 and 7.356μmol/L,respectively.Compared with control group,the wound healing rate was significantly decreased in each group treated with SS for 48 h(P<0.01).In HUVEC,the number of migrating cells in middle dose and high dose groups decreased(P<0.01),whereas in lung cancer cells,the number of migrating cells in each group decreased after SS treatment(P<0.01).The mRNA expression levels of VEGF,VEGFR2 and Ang Ⅱ were lower in high-dose SS group than those in control group(P<0.05 or P<0.01).In H520 cells,compared with control group,the protein levels of VEGF,p-PI3K and p-Akt in SS treatment groups were significantly decreased(P<0.05 or P<0.01).CONCLUSION:Sodium selenite inhibits the viability and migration of HUVEC,H520 cells and A549 cells,and inhibits the formation of vasculogenic mimicry and mosaic vessels in NSCLC cells.This mechanism may be related to the inhibition of PI3K-Akt signaling pathway activation and regulation of VEGF.