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Journal of Zhejiang University SCIENCE B 2017 Vol.18 No.5 P.373-382

http://doi.org/10.1631/jzus.B1600073


Ethaselen: a novel organoselenium anticancer agent targeting thioredoxin reductase 1 reverses cisplatin resistance in drug-resistant K562 cells by inducing apoptosis


Author(s):  Suo-fu Ye, Yong Yang, Lin Wu, Wei-wei Ma, Hui-hui Zeng

Affiliation(s):  State Key Laboratory of Natural and Biomimetic Drugs, Peking University, Beijing 100191, China; more

Corresponding email(s):   pkuyesuofu@163.com, zenghh@bjmu.edu.cn

Key Words:  Cisplatin resistance, Cisplatin, Bcl-2, Cytochrome c, Ethaselen


Suo-fu Ye, Yong Yang, Lin Wu, Wei-wei Ma, Hui-hui Zeng. Ethaselen: a novel organoselenium anticancer agent targeting thioredoxin reductase 1 reverses cisplatin resistance in drug-resistant K562 cells by inducing apoptosis[J]. Journal of Zhejiang University Science B, 2017, 18(5): 373-382.

@article{title="Ethaselen: a novel organoselenium anticancer agent targeting thioredoxin reductase 1 reverses cisplatin resistance in drug-resistant K562 cells by inducing apoptosis",
author="Suo-fu Ye, Yong Yang, Lin Wu, Wei-wei Ma, Hui-hui Zeng",
journal="Journal of Zhejiang University Science B",
volume="18",
number="5",
pages="373-382",
year="2017",
publisher="Zhejiang University Press & Springer",
doi="10.1631/jzus.B1600073"
}

%0 Journal Article
%T Ethaselen: a novel organoselenium anticancer agent targeting thioredoxin reductase 1 reverses cisplatin resistance in drug-resistant K562 cells by inducing apoptosis
%A Suo-fu Ye
%A Yong Yang
%A Lin Wu
%A Wei-wei Ma
%A Hui-hui Zeng
%J Journal of Zhejiang University SCIENCE B
%V 18
%N 5
%P 373-382
%@ 1673-1581
%D 2017
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.B1600073

TY - JOUR
T1 - Ethaselen: a novel organoselenium anticancer agent targeting thioredoxin reductase 1 reverses cisplatin resistance in drug-resistant K562 cells by inducing apoptosis
A1 - Suo-fu Ye
A1 - Yong Yang
A1 - Lin Wu
A1 - Wei-wei Ma
A1 - Hui-hui Zeng
J0 - Journal of Zhejiang University Science B
VL - 18
IS - 5
SP - 373
EP - 382
%@ 1673-1581
Y1 - 2017
PB - Zhejiang University Press & Springer
ER -
DOI - 10.1631/jzus.B1600073


Abstract: 
It has been reported that ethaselen shows inhibitory effects on thioredoxin reductase (TrxR) activity and human tumor cell growth. In order to find an efficient way to reverse cisplatin resistance%29&ck%5B%5D=abstract&ck%5B%5D=keyword'>cisplatin resistance, we investigated the reversal effects of ethaselen on cisplatin resistance%29&ck%5B%5D=abstract&ck%5B%5D=keyword'>cisplatin resistance in K562/cisplatin (CDDP) cells that were established by pulse-inducing human erythrocyte leukemic cell line K562, which are fivefold more resistant to cisplatin compared to K562 cells. The morphology and growth showed that the adhesion of K562/CDDP further decreased while the cell volume increased. The proliferation of K562/CDDP is strengthened. The antitumor activities in vitro were assessed by MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide) assay and combination index (CI), showing the significant synergic effects of cisplatin and ethaselen. Focusing on apoptosis, a series of comparisons was made between K562 and K562/CDDP. cisplatin induced higher reactive oxygen species (ROS) generation in K562 and subsequently induced the formation of mitochondrial permeability transition pores (PTPs). In addition, cisplatin increased the ratio of Bax to bcl-2 in K562, which can influence the mitochondrial membrane permeability. PTP formation and mitochondrial membrane permeabilization eventually resulted in the release of cytochrome c and activation of the Caspase pathway. However, these effects were not clearly seen in K562/CDDP, which may be the reason for the acquired CDDP resistance. However, ethaselen can induce a high level of ROS in K562/CDDP by TrxR activity inhibition and increased ratio of Bax to bcl-2 in K562/CDDP by nuclear factor κB (NF-κB) suppression, which subsequently induces the release of cytochrome c in K562/CDDP. This response is partly responsible for the reversal of the cisplatin resistance%29&ck%5B%5D=abstract&ck%5B%5D=keyword'>cisplatin resistance in K562/CDDP cells.

硫氧还蛋白还原酶抑制剂乙烷硒啉逆转顺铂耐药及其机制研究

目的:研究凋亡调控相关蛋白来了解顺铂耐药成因,同时考察乙烷硒啉(Ethaselen)在K562耐药细胞中逆转顺铂耐药的作用,并初步探讨其作用机制。
创新点:首次研究乙烷硒啉在逆转顺铂耐药中的作用,且此作用与乙烷硒啉诱导细胞凋亡相关。
方法:通过长时间脉冲诱导得到顺铂耐药K562细胞,并观察耐药细胞形态及倍增时间。采用MTT法考察乙烷硒啉、顺铂及其联用组在不同细胞株间的生长抑制作用。流式细胞术分析细胞凋亡情况以及细胞内活性氧(ROS)水平。最后,通过蛋白质免疫印迹(Western blot)考察凋亡调控相关蛋白水平的变化。
结论:脉冲诱导得到的K562耐药细胞对顺铂的耐受性是原K562细胞的5.34倍。形态学观察发现,耐药细胞体积增大,粘附性进一步降低。乙烷硒啉与顺铂联用表现出协同效应。当加入少量的乙烷硒啉(顺铂与乙烷硒啉的摩尔比率为10:1),顺铂作用K562耐药细胞的半抑制浓度(IC50)值可以减少21倍。流式细胞术及Western blot表明,乙烷硒啉能够诱导耐药细胞凋亡。其逆转顺铂耐药主要是通过调控Bcl-2及Bax蛋白比例以及通过提高细胞内活性氧水平引起线粒体通透转运孔道(PTP)蛋白孔道的形成来促使释放细胞色素c,进而引起Caspase凋亡途径。

关键词:乙烷硒啉;顺铂耐药;K562;凋亡;Bcl-2

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article

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