X射线对肺癌细胞株A549的P57kip2和TGF-β1蛋白表达的影响

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12 Gy)照射,于不同时间(6、12、24、36和48 h)提取蛋白,采用Western blot 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^kip2蛋白的表达增加,照后12 h达峰值,在2～8 Gy之间,p57随着照射剂量的增加而升高,12 Gy时,其含量较4～8 Gy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。

Effect of X-irradiation on the protein expression of P57kip2 and TGF-β1 in lung cancer cell stain A549

Objective To analyze the effect of X-irradiation on the proteins expression of p57kip2 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 differenl doses(2,4, 8 and 12 Gy).The expression of p57kip2 and TGF-β1 proteins were examined by Western blot.Results The expression of p57kip2 in lung cancer cell stain A549 was very low before X-irradiation.and increased significantly after irradiation with difierent doses and reached the peak level at 12 hours after irradiation(P<0.05).TGF-β1 reached its peak 1evel at 6 hours after irradiation(P<0.05).Conclusions X-irradiation can up-regulate the expression of p57kip2 and TGF-β1 proteins which increased with certain doses.p57kip2 and TGF-β1 could be usedto predict the damage degree of cancer cells by X-ray.