Epigallocatechin-3-Gallate Enhances the Therapeutic Effects of Leptomycin B on Human Lung Cancer A549 Cells

被引:26
|
作者
Cromie, Meghan M. [1 ]
Gao, Weimin [1 ]
机构
[1] Texas Tech Univ, Inst Environm & Human Hlth, Dept Environm Toxicol, Lubbock, TX 79409 USA
关键词
GREEN TEA POLYPHENOLS; ANTICANCER ACTIVITY; TARGETED THERAPIES; ANTITUMOR-ACTIVITY; GROWTH-INHIBITION; TUMOR-GROWTH; IN-VITRO; APOPTOSIS; EGCG; (-)-EPIGALLOCATECHIN-3-GALLATE;
D O I
10.1155/2015/217304
中图分类号
Q2 [细胞生物学];
学科分类号
071009 ; 090102 ;
摘要
Our previous studies have shown Leptomycin B (LMB) is a promising antilung cancer drug. Epigallocatechin-3-gallate (EGCG) has antitumor properties but a debatable clinical application. The objective of this study is to evaluate the combination therapeutic effect of LMB and EGCG and its molecular mechanisms in human lung cancer A549 cells. Increased cytotoxicity was observed in LMB+EGCG-treated cells compared to LMB-treated cells. Elevated ROS was maximized 2 h after treatment, and LMB+EGCG-treated cells had higher ROS levels compared to LMB. N-Acetyl-L-cysteine (NAC) studies confirmed the oxidative role of LMB and/or EGCG treatment. In comparison to the control, CYP3A4, SOD, GPX1, and p21 mRNA expression levels were increased 7.1-, 2.0-, 4.6-, and 13.1-fold in LMB-treated cells, respectively, while survivin was decreased 42.6-fold. Additionally, these increases of CYP3A4, SOD, and GPX1 were significantly reduced, while p21 was significantly increased in LMB+EGCG-treated cells compared to LMB-treated cells. The qRT-PCR results for p21 and survivin were further confirmed by Western blot. Our study first shows that LMB produces ROS and is possibly metabolized by CYP3A4, GPX1, and SOD in A549 cells, and combination treatment of LMB and EGCG augments LMB-induced cytotoxicity through enhanced ROS production and the modulation of drug metabolism and p21/survivin pathways.
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页数:10
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