肺癌,放射治疗,EGFR,TGF-α ," /> 肺癌,放射治疗,EGFR,TGF-α ,"/> EGFR和TGF-α在肺癌细胞放疗增敏中的作用

临床肿瘤学杂志 ›› 2019, Vol. 24 ›› Issue (2): 145-148.

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EGFR和TGF-α在肺癌细胞放疗增敏中的作用

  

  1. 1  226361  江苏南通  南通大学附属肿瘤医院放疗科

    2  226361  南通大学附属肿瘤医院病理科

  • 收稿日期:2018-07-14 修回日期:2018-11-22 出版日期:2019-02-28 发布日期:2019-03-18
  • 基金资助:
    基金项目:2016年南通市科技计划资助项目(YYZ16023)

The effect of EGFR and TGF-α in radiosensitization of lung cancer cells

  1. Department of Radiotherapy, Cancer Hospital Affiliated to Nantong University, Nantong 226361, China

  • Received:2018-07-14 Revised:2018-11-22 Online:2019-02-28 Published:2019-03-18

摘要: 目的 研究表皮生长因子受体(EGFR)、转化生长因子-α(TGF-α)与肺癌细胞不同放疗分割剂量的关系及可能作用机制。方法 对A549细胞采用常规分割(2 Gy/天)和大分割(4、8 Gy/天)照射,DT=8 Gy,采用实时荧光定量 PCR (QPCR)、酶联免疫吸附测定(ELISA)法、Western blotting分别检测A549细胞中EGFR、TGF-α基因和蛋白表达,另采用免疫荧光法测定γ-H2AX表达。结果 4 Gy/天和 8 Gy/天分割组A549细胞中EGFR、TGF-α mRNA表达水平均显著低于2 Gy/天组(P<0.05);4 Gy/天和 8 Gy/天分割组A549细胞中EGFR、TGF-α 蛋白表达均显著低于2 Gy/天组(P<0.05)。免疫荧光法结果显示,4 Gy/天和 8 Gy/天分割组A549细胞中γ-H2AX表达明显高于对照组和2 Gy/天分割组。结论  大剂量分割放疗后EGFR、TGF-α 表达明显下调,增加A549细胞对放射线的敏感性,其机制可能与DNA损伤修复组蛋白γ-H2AX表达上调有关。

关键词:

肺癌')">"> 肺癌, 放射治疗, EGFR, TGF-α

Abstract:

Objective  To study the relationship between epidermal growth factor receptor (EGFR), transforming growth factor-α(TGF-α) and different fractional doses of radiotherapy in lung cancer cells and its possible mechanism. Methods Lung cancer cell line A549 cells were irradiated with conventional fractionation (2Gy/day) and large fractionation (4,8 Gy/day), DT=8 Gy. Real-time fluorescence quantitative PCR (QPCR), enzyme-linked immunosorbent assay (ELISA) and Western blotting were used to detect EGFR, TGF-α gene and protein expression in A549 cells, respectively. In addition, the expression of γ-H2AX was determined by immunofluorescence assay. Results The expression levels of EGFR mRNA and TGF-α mRNA in A549 cells of 4 Gy/day and 8 Gy/day fractionation groups were significantly lower than those of 2 Gy/day fractionation group (P<0.05). The expressions of EGFR and TGF-α proteins in A549 cells of 4 Gy/day and 8 Gy/day fractionation groups were significantly lower than those of 2 Gy/day fractionation group (P<0.05). Immunofluorescence assay showed that the expression ofγ-H2AX in A549 cells in 4 Gy/day and 8 Gy/day fractionation groups was significantly higher than that in control group and 2 Gy/day fractionation group. Conclusion The expression of EGFR and TGF-α decreased significantly after high dose fractionated radiotherapy, which increased the sensitivity of A549 cells to radiation. The mechanism may be related to the up-regulation of the expression of histone γ-H2AX in DNA damage repair.

Key words: Lung cancer, Radiotherapy, EGFR, TGF-α

中图分类号: 

  • R730.55
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