姜黄素对雄激素非依赖性前列腺癌细胞PC-3及血管内皮生长因子的影响

目的:研究姜黄素对雄激素非依赖性前列腺癌细胞株PC-3细胞体外作用及其对血管内皮生长因子(VEGF)表达的影响,探讨其抗肿瘤的作用机制。方法:分别用0、6.25、12.5、25、50μmol/L浓度的姜黄素作用于PC-3细胞,12、24、36、48、72、96h后台盼蓝拒染法、四甲基偶氮唑蓝(MTT)法检测细胞生长活性;24h后流式细胞仪测定细胞周期及凋亡的变化,透射电镜观察细胞超微结构变化;半定量RT-PCR法检测PC-3细胞内VEGFmRNA的表达;ELISA检测细胞上清液中VEGF浓度。结果:姜黄素能显著抑制PC-3细胞的增殖,呈剂量与时间依赖性,不同浓度姜黄素组之间及不同时间组之间差异均有统计学意义(P<0.01)。不同浓度姜黄素诱导PC-3细胞出现剂量依赖性G2/M期阻滞(P<0.01),且各浓度组凋亡细胞比例均显著高于空白对照组(P<0.01),差异有统计学意义;姜黄素作用24h后PC-3细胞出现凋亡的形态学改变;PC-3细胞内VEGF mRNA的表达和细胞上清液中VEGF呈剂量依赖性降低。结论:姜黄素能显著抑制体外PC-3细胞的生长,并促进其G2/M期阻滞和凋亡,VEGFmRNA及蛋白的表达也明显降低,可能是其抑制肿瘤和血管生长的机制之一。

Curcumin Inhibits the Expression of Vascular Endothelial Growth Factor and Androgen-independent Prostate Cancer Cell Line PC-3 in vitro

OBJECTIVE: To study the effects of curcumin on the expression of the vascular endothelial growth factor (VEGF) and androgen-independent prostate cancer cell line PC-3, and to explore its anticarcinogenic mechanism. METHODS: PC-3 cells were treated with curcumin at the concentration of 0, 6.25, 12.5, 25 and 50 micromol/L respectively. Then the cell activity was assayed by dyed rate of Typan blue and MTT at 12, 24, 36, 48, 72 and 96 hours, the cell cycle and morphological changes observed by flow cytometry (FCM) and electronic microscopy at 24 hours, the VEGF mRNA expression measured by semi-quantitative RT-PCR, and the secreting protein levels of VEGF in the supernatants determined by enzyme-linked immunosorbent assay (ELISA). RESULTS: The growth of PC-3 cells was suppressed obviously by curcumin in a dose- and time-dependent manner in vitro. There were significant differences in inhibition rate among different concentration and time groups (P < 0.01). Furthermore, curcumin arrested the cell cycle of PC-3 cells in the G2/M phase in a dose-dependent manner (P < 0.01). The percentages of apoptotic cells were significantly higher in different concentration groups than in the controls (P < 0.01). Apoptosis-associated morphological changes were observed in PC-3 cells at 24 hours, and a marked decline in the expression of VEGF was noted after the exposure to different concentrations of curcumin within 24 hours. CONCLUSION: Curcumin can suppress the growth of PC-3 cells, promote their apoptosis and arrest their cell cycle in the G2/M phase, and reduce the expression of VEGF mRNA and proteins, which may sever to explain its inhibitory effect on tumor and angiogenesis.