[1]黄玲萍,谢丽霞,邱钰超,等.依他尼酸联合顺铂化疗促肺癌A549细胞凋亡的作用及机制研究[J].第三军医大学学报,2017,39(17):1720-1727.
 HUANG Lingping,XIE Lixia,QIU Yuchao,et al.Ethacrynic acid promotes apoptosis in lung cancer A549 cells when combined with cisplatin chemotherapy[J].J Third Mil Med Univ,2017,39(17):1720-1727.
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依他尼酸联合顺铂化疗促肺癌A549细胞凋亡的作用及机制研究(/HTML )
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《第三军医大学学报》[ISSN:1000-5404/CN:51-1095/R]

卷:
39卷
期数:
2017年第17期
页码:
1720-1727
栏目:
基础医学
出版日期:
2017-09-15

文章信息/Info

Title:
Ethacrynic acid promotes apoptosis in lung cancer A549 cells when combined with cisplatin chemotherapy
作者:
黄玲萍谢丽霞邱钰超胡萍叶小群
南昌大学第二附属医院呼吸内科;江西省井冈山大学临床医学院内科教研室;江西省新钢中心医院呼吸内科
Author(s):
HUANG Lingping XIE Lixia QIU Yuchao HU Ping YE Xiaoqun

Department of Respiratory Diseases, Second Affiliated Hospital of Nanchang University, Nanchang, Jiangxi Province, 330006; Department of Internal Medicine Teaching, College of Clinical Medicine, Jinggangshan University, Ji’an, Jiangxi Province, 343000; Department of Respiratory Diseases, Xingang Central Hospital of Jiangxi Province, Xinyu, Jiangxi Province, 338001,  China

关键词:
肺癌干细胞依他尼酸GST&beta-catenin
Keywords:
lung cancer stem cells ethacrynic acid glutathione S-transferase &beta-catenin
分类号:
R73-361; R734.2; R979.1
文献标志码:
A
摘要:

目的      探讨依他尼酸(ethacrynic acid,EA)杀伤肺癌A549细胞球的作用及机制研究。方法      无血清培养基中培养A549细胞球,应用Western blot检测CD133、SOX2、EpCAM和ABCG2的蛋白表达水平。应用1、2、5、10、20 mg/mL的浓度顺铂(cisplatin,DDP)分别处理A549及细胞球48 h,用MTT检测48 h内细胞的存活率。应用比色法检测10、50、100、200 μmol/L EA对A549细胞球中谷胱甘肽S-转移酶(glutathione S-transferase,GST)活性的抑制作用。应用流式细胞术、Western blot、Realtime-PCR、相差显微镜观察检测200 μmol/L EA处理A549细胞球前后ROS水平、细胞成球能力、β-catenin、Sox2和ABCG2 mRNA和蛋白以及βcatenin启动子活性的变化情况。应用β-catenin腺病毒感染A549细胞球后,再用200 μmol/L EA的处理A549细胞球,利用Real-time PCR和Western blot检测β-catenin S、Sox2和ABCG2 mRNA和蛋白的变化,并用MTT检测A549细胞球增殖的抑制作用。结果      成功培养出悬浮的A549细胞球,其高表达肿瘤干细胞标志物CD133、SOX2、EpCAM以及耐药相关蛋白ABCG2,并可耐受不同浓度DDP的杀伤作用。200 μmol/L EA处理A549细胞球后ROS水平明显升高,而GST活性、β-catenin、Sox2和ABCG2 mRNA和蛋白的表达、β-catenin的启动子活性、A549细胞球的成球能力显著下降,并且200 μmol/L EA联合5 mg/mL DDP可增强对抑制A549细胞球增殖的作用和增加细胞凋亡的水平(P<0.05)。过表达β-catenin后,200 μmol/L EA对β-catenin、Sox2和ABCG2 mRNA和蛋白的抑制作用较空载体组显著减弱。此外,过表达β-catenin可显著缓解200 μmol/L EA联合5 mg/mL DDP对A549细胞球的增殖抑制作用。结论     EA通过抑制GST活性和β-catenin水平,发挥抑制A549细胞球增殖和干性,促进其凋亡的作用。EA可望成为治疗肺癌及肺癌干细胞的药物。

Abstract:

Objective     To investigate the killing effect of ethacrynic acid (EA) on lung cancer A549 cells derived spheres and explore the underlying mechanism. Methods     A549 spheres were cultured in serum-free medium, and the protein expression of CD133, SOX2, EpCAM and ABCG2 was detected by Western blotting. MTT assay was used to evaluate the cell viability of A549 spheres and A549 cells after treated by 1, 2, 5, 10 and 20 mg/mL cisplatin (DDP) for 48 h. The activity of glutathione S-transferase (GST) was measured by colorimetric method after A549 spheres were treated with 10, 50, 100 and 200 μmol/L EA, respectively. Flow cytometry, Western blotting, real-time PCR and luciferase assay were used to analyze the levels of cellular reactive oxygen species (ROS), formation of A549 spheres, mRNA and protein expression levels of βcatenin, Sox2 and ABCG2, and promoter activity of β-catenin upon 200 μmol/L EA treated cells for 48 h. A549 sphere was infected with β-catenin adenovirus for 24 h, followed by 200 μmol/L EA treatment (in presence or absence of 5 mg/mL DDP) for 24 h. The expression of βcatenin, Sox2 and ABCG2 at mRNA and protein levels was detected by real-time PCR and Western blotting, and cell growth of A549 spheres was evaluated by MTT assay.  Results    The A549 spheres, with high expression of tumor stem cells markers CD133, SOX2, EpCAM and drug resistance related molecule ABCG2, and resistance to DDP at different doses, were successfully derived. After 200 μmol/L EA had treated A549 sphere for 48 h, the levels of ROS were significantly increased (P<0.05), and the mRNA and protein levels of β-catenin, Sox2 and ABCG2, and promoter activity of β-catenin were notably decreased (P<0.05). The treatment of 200 μmol/L EA enhanced the inhibitory effect on proliferation and the promoting effect on apoptosis in A549 spheres induced by 5 mg/mL DDP (P<0.05). Up-regulation of β-catenin by adenoviral infection partly reversed the effects of 200 μmol/L EA on suppressing the expression levels of β-catenin, Sox2 and ABCG2, compared to the spheres infected with blank adenovirus. Additionally, β-catenin over-expression significantly remitted the inhibitory effect of 200 μmol/L EA and 5 mg/mL DDP on the proliferation in A549 spheres. Conclusion    EA exerts inhibitory effect on the proliferation and stemness of A549 spheres through suppressing GST activity and βcatenin expression, and then promotes cell apoptosis. EA might be a novel drug in treatment of lung cancer and cancer stem cells.

更新日期/Last Update: 2017-09-04