摘要
目的观察不同剂量X射线照射后不同时间A549肺癌细胞株中P57^kip2和TGF-β1蛋白表达水平,探讨X射线对P57^kip2和TGF-β1的影响及临床意义。方法按常规方法培养肺癌细胞株A549,实验分5组,照射组分别给予不同剂量X射线(2、4、8和12Gy)照射,于不同时间(6、12、24、36和48h)提取蛋白,采用Westernblot检测P57^kip2和TGF-β1蛋白的表达水平。结果X射线可导致肺癌细胞P57罐蛋白的表达增加,照后12h达峰值,在2—8Gy之间,p57随着照射剂量的增加而升高,12Gy时,其含量较4-8Gy减少。不同剂量和不同时间P57^kip2蛋白的表达,差异有统计学意义(P〈0.05),TGF-β1在照后6h达峰值,之后迅速下降,各不同剂量和不同时间水平之间差异有统计学意义(P〈0.05)。结论X射线照射可以上调肺癌细胞株A549的P57^kip2和TGF-β1蛋白表达,两者有一定的相关性,且在一定剂量范围内呈剂量依赖性,可以反映肺癌细胞损伤的程度。
Objective To analyze the effect of X-irradiation on the proteins expression of P57^kip2 and TGF-β1 in lung cancer cell stain A549 and its clinical significance. Methods Lung cancer cell stain A549 was cultivated and cell, protein was extracted at 6,12,24,36 and 48 hours after X-irradiation by different doses(2,4, 8 and 12 Gy). The expression of P57^kip2 and TGF-β1 proteins were examined by Western blot. Results The expression of P57^kip2 in lung cancer cell stain A549 was very low before X-irradiation, and increased significantly after irradiation with different doses and reached the peak level at 12 hours after irradiation( P 〈 0.05). TGF-β1 reached its peak level at 6 hours after irradiation( P 〈 0.05). Conclusions X-irradiation can up-regulate the expression of P57^kip2 and TGF-β1 proteins which increased with certain doses,P57^kip2 and TGF-β1 could be used to predict the damage degree of cancer ceils by X-ray.
出处
《中华放射医学与防护杂志》
CAS
CSCD
北大核心
2008年第3期249-251,共3页
Chinese Journal of Radiological Medicine and Protection
基金
辽宁省自然科学基金资助项目