Combretastatin A-4氨基糖类衍生物CPU-XT-008抑制血管内皮细胞增殖的分子机制

Molecular mechanisms of combretastatin A-4 amino sugar derivative CPUXT-008 on inhibiting proliferation of vascular endothelial cells

以人脐静脉内皮细胞(HUVEC)为模拟肿瘤血管内皮细胞的实验模型,研究combretastatin A-4(CA-4)的氨基糖类衍生物CPU-XT-008对HUVEC的增殖、周期分布、微管蛋白聚合以及关键周期调控蛋白表达的影响。采用MTT法检测CPU-XT-008对HUVEC增殖的影响;采用流式细胞仪检测CPU-XT-008对HUVEC周期分布的影响;采用免疫荧光染色检测CPU-XT-008对HUVEC凋亡及β-tubulin微管蛋白的聚合变化;采用Western blot检测CPU-XT-008对周期蛋白Cyclin B1,Cdc2和微管蛋白β-tubulin的影响。结果表明,CPU-XT-008能以微管蛋白为靶点抑制β-tubulin微管蛋白聚合,通过上调HUVEC的细胞周期蛋白Cyclin B1水平表达,下调细胞周期依赖性激酶Cdc2蛋白水平的表达从而引发细胞G2/M期阻滞,抑制细胞增殖并诱导细胞凋亡。

Taking human umbilical vein endothelial cells （HUVEC）as experimental model which can simulate tumor-derived vascular endothelial cells;the effects of CPU-XT-008;an amino sugar derivative of combretastatin A-4 （CA-4）;on HUVEC proliferation;cell cycle distribution;tubulin polymerization and the key regulatory pro-tein of cell cycle were studied.The effect of CPU-XT-008 on the proliferation of HUVEC was determined by MTT assay.The cell cycle distribution caused by CPU-XT-008 was detected by flow cytometry.Immunofluorescence was used to detect apoptosis and tubulin polymerization.The expressions of Cyclin B1;Cdc2 and β-tubulin were detected by Western blotting.Results demonstrated that CPU-XT-008 could target tubulin and inhibit the poly-merization ofβ-tubulin;and it could lead to G2/M cell cycle arrest in HUVEC by up-regulating Cyclin B1 expres-sion and down-regulating Cdc2 and p-Cdc2 expression;which resulted in inhibiting the proliferation of HUVEC and inducing its apoptosis.