前列腺素E2对大鼠巨噬细胞株NR8383 合成血管内皮生长因子促进人脐静脉血管内皮细胞成管、迁移的影响

目的探究前列腺素E2（PGE2）对大鼠巨噬细胞株NR8383细胞合成血管内皮生长因子（VEGF）的调控作用以及对人脐静脉内皮细胞（HUVEC）趋化成管的影响。方法分别采用0.1 nmol/L PGE2、1 nmol/L PGE2、1 nmol/L PGE2+10 nmol/L EP2受体抑制剂AH6809+10 nmol/L EP4受体抑制剂AH23848 处理的NR8383 细胞作为各实验组，选择未经PGE2以及其特异性受体抑制剂处理的NR8383 细胞作为对照组，采用Western blot 和qPCR方法检测各组NR8383细胞内VEGF蛋白以及mRNA的表达水平；收集以上各处理组的细胞培养上清液分别刺激HUVECs，运用TRANSWELL 小室、Matrigel 胶细胞成管实验等实验方法，观察PGE2调控巨噬细胞对HUVEC 迁移效应和成管能力的影响。结果随着NR8383 细胞培养液中加入PGE2浓度增高，其VEGF蛋白表达和VEGF mRNA的表达水平显著升高（P<0.05）；0.1 nmol/L、1 nmol/L PGE2处理过的NR8383细胞培养上清液可以显著增加HUVEC细胞形成的小管面积，形成小管面积随着PGE2处理浓度的增加而增加（P<0.05）；HUVECs的迁移运动也随着PGE2处理浓度的升高不同程度的增强，HUVECs趋化的数量显著升高（P<0.05）；研究发现PGE2特异性的EP2/EP4 受体拮抗剂AH6809/AH23848，可以显著抑制PGE2 增强NR8383 细胞内VEGF mRNAs 表达的作用并且也显著抑制PGE2 增强NR8383细胞促进HUVECs成管和趋化能力的效应（P<0.05）。结论PGE2可以通过作用NR8383细胞表面对应的EP2/EP4受体调控VEGF的合成，促进HUVEC趋化和成管效应。

Media of rat macrophage NR8383 cells with prostaglandins E2-induced VEGF over-expression promotes migration and tube formation of human umbilical vein endothelial cells

Objective To investigate the effect of prostaglandins E2 (PGE2) in enhancing vascular endothelial growth factor (VEGF) expression in a rat macrophage cell line and the effect of the media from PGE2-inuced rat macrophages on angiogenetic ability of human umbilical vein endothelial cells (HUVECs) in vitro. Methods Western blotting and qPCR were employed to investigate the expressions of VEGF protein and mRNAs in rat macrophage cell line NR8383 stimulated by PGE2 in the presence or absence of EP2 receptor inhibitor (AH6809) and EP4 receptor inhibitor (AH23848). Conditioned supernatants were obtained from different NR8383 subsets to stimulate HUVECs, and the tube formation ability and migration of the HUVECs were assessed with Transwell assay. Results PGE2 stimulation significantly enhanced the expression of VEGF protein and mRNAs in NR8383 cells in a dose-dependent manner. The supernatants from NR8383 cells stimulated by PGE2 significantly enhanced tube formation ability of HUVECs (P<0.05) and promoted the cell migration. Such effects of PGE2 were blocked by the application of AH6809 and AH23848. Conclusion PGE2 can dose-dependently increase VEGF expression in NR8383 cells, and the supernatants derived from PGE2-stimulated NR8383 cells can induce HUVEC migration and accelerate the growth of tube like structures. PGE2 are essential to corpus luteum formation by stimulating macrophages to induce angiogenesis through EP2/EP4.