中文摘要：

目的 探讨放射对人鼻咽高分化鳞癌细胞系（CNE-1）凋亡率和7个凋亡相关基因表达水平影响.方法 体外培养CNE-1,应用流式细胞术及RT-PCR方法检测0、2、4、6、8Gy下CNE-1凋亡率及Bcl-2、Bcl-xl、Bcl-w、Bax、Bak、Bad、Bid的表达水平.用Pearson法进行基因表达与凋亡率、照射剂量,以及凋亡率与存活分数相关分析.结果 0、2、4、6Gy下CNE-1早期凋亡率随照射剂量增加而逐渐增加,8Gy时早期凋亡率不再增加反而下降；晚期凋亡率随照射剂量增加而增加.CNE-1照射后Bax表达上调,与早、晚期凋亡率及照射剂量呈正相关（所有P=0.000）；Bcl-xl表达下调,与早、晚期凋亡率呈负相关（P =0.005、0.039）,与照射剂量无相关性（P =0.369）；Bcl-2表达上调,在4Gy时到达峰值后开始下降；Bcl-w、Bcl-2、Bad、Bid表达水平与早、晚期凋亡率无相关性（P=0.058～0.894）.凋亡率与存活分数无相关性（P =0.064）.结论 Bax、Bcl-xl与CNE-1细胞凋亡率有一定相关性,但凋亡率与细胞存活分数无相关性.

英文摘要：

Abstract： Objective To investigate the effects of radiation on the apoptosis rate and expression of 7 apoptosis-related genes in well-differentiated human nasopharyngeal carcinoma cell line CNE-1.Methods CNE-1 cells were cultured in vitro.The apoptosis rates of CNE-1 cells under 0-,2-,4-,6-,and 8-Gy radiation were measured by flow cytometry.The mRNA expression levels of Bcl-2,Bcl-xl,Bcl-w,Bax,Bak,Bad,and Bid were measured by RT-PCR.The Pearson test was used for analyzing the correlation of mRNA expression with apoptosis rate and radiation dose and the correlation between apoptosis rate and survival fraction.Results The early apoptosis rate of CNE-1 cells increased gradually as the radiation dose ranged from 0 to 6 Gy,but decreased when the radiation dose was 8 Gy; the late apoptosis rate of CNE-1 cells increased as the radiation dose ranged from 0 to 8 Gy.The mRNA expression of Bax was upregulated as CNE-1 cells were irradiated,and it was positively correlated with the early/late apoptosis rate and radiation dose （P =0.000 for all comparisons）.The mRNA expression of Bcl-xl was downregulated,and it was negatively correlated with the early/late apoptosis rate （P =0.005 and 0.039） ; but it showed no correlation with radiation dose （P =0.369）.The mRNA expression of Bcl-2 was upregulated and reached the peak level when the radiation dose was 4 Gy,and then it fell as the radiation dose increased.The mRNA expression of Bcl-w,Bcl-2,Bad,and Bid were not correlated with the early/late apoptosis rate （P =0.058 -0.894）.There was no correlation between the apoptosis rate and survival fraction in CNE-1 cells （P =0.064）.Conclusions Bax and Bcl-xl have some correlation with apoptosis rate in CNE-1 cells,but no correlation between the apoptosis rate and survival fraction was observed.