模拟IMRT对CNE-2细胞周期及Cyclin D1/Cyclin B1表达的影响

目的 探讨模拟调强放射治疗(IMRT)对人鼻咽低分化鳞癌细胞株(CNE-2)细胞周期及细胞周期素Cyclin D1、Cyclin B1转录水平的影响.方法 CNE-2分为急速照射(ART)组和模拟IMRT组,两组分别给予6MV X线2、4、6和8 Gy 四个剂量点的照射;ART组的照射时间为1～3 min,模拟IMRT组的完成时间为35 min.另设空白对照组,不接受照射,其余条件相同.照射后12 h,流式细胞术分析细胞周期分布,RT-PCR检测细胞周期素Cyclin D1和Cyclin B1的转录水平.结果 在相同剂量点,模拟IMRT组G2期细胞比例均低于ART组,两组G2期细胞比例随照射剂量的增加而逐渐增加.模拟IMRT组与ART组在相同剂量点之间比较,Cyclin D1转录水平的差异均无统计学意义(P均＞0.05);Cyclin B1转录水平的差异均有统计学意义(P均<0.05),且随照射剂量的增加而下降,模拟IMRT组Cyclin B1的表达高于ART组.结论 模拟IMRT照射时间延长对G2期阻滞作用下降,细胞周期素Cyclin B1的表达相对升高.

Effects of modeling IMRT on cell cycle and expression of Cyclin D1/Cyclin B1 in CNE-2 cell lines

Objective To detect the cell cycle and mRNA expression of Cyclin B1 and Cyclin D1 in human nasopharyngeal carcinoma cell line(CNE-2) with modeling intensity modulated radiation therapy(IMRT). Methods CNE-2 cell lines were divided into acute irradiation therapy(ART) group and modeling IMRT group,and both groups were irradiated at 2,4,6 and 8Gy dose levels by 6 MV X-ray.The time of irradiation in ART group was 1 to 3 min,and that in IMRT group was 35 min.Besides,blank control group without irradiation was est...