PD 0332991对人内皮细胞增殖和凋亡的作用

Role of PD 0332991 on the Proliferation and Apoptosis of Vascular Endothelial Cells

背景与目的肿瘤的血管生成(angiogenesis)是肿瘤发展中的一个重要过程。PD 0332991是一种细胞周期抑制剂,能特异性抑制CDK4/6的活性及细胞周期进展,在小鼠的移植瘤模型中,使用PD 0332991治疗的小鼠,其移植瘤中微血管生成明显减少、血管密度显著低于对照组,但其机理不明。本研究的目的在于探讨PD0332991对血管内皮细胞的作用及分子机理。方法采用EA.hy926血管内皮细胞作为研究模型。MTT法及EdU法检测PD 0332991对EA.hy926细胞活性和增殖能力的影响;划痕实验和transwell小室实验检测PD 0332991对内皮细胞迁移力的影响;流式细胞术检测PD 0332991对内皮细胞细胞周期及细胞凋亡的影响;Western blot检测PD 0332991对内皮细胞细胞周期相关蛋白表达的影响。结果 PD 0332991显著抑制EA.hy926内皮细胞的增殖、活性及迁移能力;使EA.hy926内皮细胞周期受阻滞并诱导其凋亡;抑制CDK4/6表达以及Rb的磷酸化,从而抑制内皮细胞细胞周期进展。结论 PD 0332991能抑制内皮细胞的增殖和活性,并诱导其凋亡。

Background and objective Angiogenesis is an important process in the development of tumor. PD 0332991, a cell cycle inhibitor, can specifically inhibit CD4/6 phosphorylation and cell cycle progression. In xeongraft mice models, PD 0332991 treated mice had significantly decreased angiogenesis and vascular density compared with the control group, but the mechanism remains unknown. The purpose of this study is to investigate the role and molecular mechanism of PD 0332991 on vascular endothelial cells. Methods EA.hy926 cells, a kind of vascular endothelial cell, were used as the research model. The effects of PD 0332991 on the activity and proliferation of EA.hy926 cells were detected by the MTT, EdU assays. Wound-healing assays and transwell assays were used to determine the effects of PD 0332991 on the mobility of EA.hy926. The influence of PD 0332991 on cell cycle and apoptosis of endothelial cells was tested by flow cytometry, and the Western blot was applied to observe the expression of cell cycle related proteins in EA.hy926 cells treated by PD 0332991. Results PD 0332991 significantly inhibited the proliferation and mobility of EA.hy926 cells, caused cell cycle arrest and apoptosis. At the same time, PD 0332991 inhibited the expression of CDK4/6 and phosphorylation of Rb, and thus inhibited the cell cycle progression of EA.hy926 cells. Conclusion PD 0332991 can inhibit the proliferation and activity of endothelial cells and induces apoptosis.