摘要
本研究探讨雷帕霉素对骨髓瘤细胞系RPMI8226体外增殖、凋亡、细胞周期及对趋化因子受体CXCR4表达的影响。不同浓度雷帕霉素作用于RPMI8226细胞不同时间,应用MTT检测细胞的增殖,流式细胞术检测细胞凋亡及细胞周期,半定量PCR检测雷帕霉素干预RPMI8226后细胞周期蛋白D1(cyclinD1)、CXCR4mRNA表达,荧光定量PCR检测哺乳动物雷帕霉素靶蛋白(mTOR)mRNA表达的影响。结果表明:雷帕霉素对RPMI8226细胞有增殖抑制作用,细胞周期显示细胞阻滞于G0/G1期,G2/M期比例降低,cyclinD1、CXCR4和mTORmRNA表达下调。结论:雷帕霉素呈时间-剂量依赖性抑制RPMI8226细胞增殖,诱导细胞凋亡,并通过下调mTOR及cyclinD1表达,使细胞周期阻滞于G0/G1期,同时通过下调细胞CXCR4的表达,减少骨髓瘤细胞与基质细胞间的黏附及趋化作用达到抗肿瘤的效果。
This study was purposed to investigate the effect of rapamycin on proliferation, apoptosis, cell cycle progression and the regulation of chemokine receptor CXCR4 on RPMI8226 cells. Different concentrations of rapamycin were used to treat the multiple myeloma cell line RPMI8226 for different times. The proliferation of the cells was detected by MTT assay; the apoptosis rate and cell cycle were determined by flow cytometry （FCM） ; apoptosis of cells was observed by inverted microscopy; the cylin D1, CXCR4 and mTOR mRNA expressions were detected by RT-PCR or FQ-PCR after treating RPMI8226 cells with different concentrations of rapamycin. The results indicated that the rapamycin could inhibit the proliferation of RPMI8226 cells and induce their apoptosis. The cell cycle was arrested at the G0/G1 phase. PCR results showed the down-regulation of mTOR, cyclin D1 and mTOR mRNA expressions after treating RPMI8226 cells with different concentrations of rapamycin for 24 hours. It is concluded that the rapamycin significantly inhibits the growth of RPMI8226 cells in a dose-and time-dependent mannes and induce cell apoptosis. Cell cycle arrests at the G0/G1 phase, may be due to the down-regulation of the mTOR and cyclin D1 expressions. In additions, the down-regulation of CXCR4 mRNA expression is correlated with the reduction of adhesion between myeloma cells and stromal cells.
出处
《中国实验血液学杂志》
CAS
CSCD
2009年第2期385-389,共5页
Journal of Experimental Hematology
