EGCG协同放射治疗诱导食管鳞癌TE-1细胞凋亡机制的研究
网络出版日期: 2016-05-26
基金资助
江苏省自然科学基金(BK20131245);镇江市社会发展项目(SH2013031)
Study on mechanisms of the apoptosis in TE-1 cells of esophageal squamous cell carcinoma induced by EGCG combined with radiotherapy
Online published: 2016-05-26
Supported by
Natural Science Foundation of Jiangsu Province, BK20131245;Science and Technology Commission of Zhenjiang Municipality, SH2013031
目的 观察表没食子儿茶素没食子酸酯(EGCG)联合放射治疗(放疗)对食管癌TE-1细胞凋亡的影响,并探讨其分子机制。方法 选择人食管癌细胞株TE-1作为研究对象,并分成对照组、EGCG组、放疗组和联合组(EGCG+放疗)。MTT法检测不同浓度EGCG、不同放射剂量单用和联用对食管癌TE-1细胞生长的影响;流式细胞术检测不同处理组细胞凋亡情况;Western blotting检测经不同处理后TE-1细胞凋亡相关蛋白cleaved caspase-3和抗凋亡蛋白Bcl-2的表达情况。结果EGCG和放疗均能抑制食管癌TE-1细胞的增殖,但EGCG与放疗联合的抑制作用显著高于EGCG组或放疗组(P<0.01),呈浓度-剂量依赖性。流式细胞术检测结果显示,与单独放疗组细胞相比,EGCG联合放疗可以明显提高X射线诱导的TE-1细胞凋亡(P<0.01),上调cleaved caspase-3的表达(P<0.05)和下调Bcl-2蛋白的表达(P<0.05)。结论 EGCG能够协同放疗增加食管癌TE-1细胞的凋亡,这种作用可能与cleaved caspase-3和Bcl-2有关。
关键词: 表没食子儿茶素没食子酸酯; 放射治疗; 食管鳞状细胞癌; 细胞凋亡
刘申吒 , 韩国虎 , 周月鹏 , 毛朝明 , 陈德玉 . EGCG协同放射治疗诱导食管鳞癌TE-1细胞凋亡机制的研究[J]. 上海交通大学学报(医学版), 2016 , 36(4) : 487 . DOI: 10.3969/j.issn.1674-8115.2016.04.005
Objective To investigate the effects of epigallocatechin-3-gallate (EGCG) combined with radiotherapy on the apoptosis in TE-1 cells of esophageal squamous cell carcinoma (ESCC) and explore related molecular mechanisms. Methods ESCC TE-1 cells served as subjects and were assigned to the control group, EGCG group, radiotherapy group, and EGCG+radiotherapy group. The effects of different concentrations of EGCG, different doses of radiation, and the combination of EGCG and radiation on the growth of ESCC TE-1 cells were detected by MTT assay. The apoptosis in different treatment groups were measured by flow cytometry. The expression of apoptosis-related proteins including cleaved caspase-3 and anti-apoptosis-related protein Bcl-2 after treatment were detected by Western blotting. Results Both EGCG and radiotherapy inhibited the proliferation of ESCC TE-1 cells. The inhibitory effect of EGCG combined with radiotherapy was significantly higher as compared with the EGCG group or the radiotherapy group in a concentration-dose dependent manner (P<0.01). Results of flow cytometry showed that EGCG combined with radiotherapy significantly increased the apoptosis of TE-1 cells induced by X ray (P<0.01), up-regulated the expression of cleaved caspase-3 (P<0.05), and down-regulated the expression of Bcl-2 (P<0.05) as compared with the radiotherapy group. Conclusion EGCG combined with radiotherapy can increase the apoptosis of ESCC TE-1 cells, which may be associated with cleaved caspase-3 and Bcl-2.
Key words: EGCG; radiotherapy; esophageal squamous cell carcinoma; apoptosis
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