Genistein mediates the selective radiosensitizing effect in NSCLC A549 cells via inhibiting methylation of the keap1 gene promoter region.
Genistein mediates the selective radiosensitizing effect in NSCLC A549 cells via inhibiting methylation of the keap1 gene promoter region.
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金雀异黄素通过抑制 keap1 基因启动子区甲基化介导 NSCLC A549 细胞的选择性放射增敏作用
DOI:
10.18632/oncotarget.8403
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发表时间:
2016-05-10
期刊:
影响因子:
--
通讯作者:
Li Q
中科院分区:
文献类型:
--
作者:
Liu X;Sun C;Liu B;Jin X;Li P;Zheng X;Zhao T;Li F;Li Q
Non-small cell lung cancer (NSCLC) cells often possess a hypermethylated Keap1 promoter, which decreases Keap1 mRNA and protein expression levels, thus impairing the Nrf2-Keap1 pathway and thereby leading to chemo- or radio-resistance. In this study, we showed that genistein selectively exhibited a radiosensitizing effect on NSCLC A549 cells but not on normal lung fibroblast MRC-5 cells. Genistein caused oxidative stress in A549 cells rather than MRC-5 cells, as determined by the oxidation of the ROS-sensitive probe DCFH-DA and oxidative damage marked by MDA, PCO or 8-OHdG content. In A549 instead of MRC-5 cells, genistein reduced the level of methylation in the Keap1 promoter region, leading to an increased mRNA expression, thus effectively inhibited the transcription of Nrf2 to the nucleus, which suppressed the Nrf2-dependent antioxidant and resulted in the upregulation of ROS. Importantly, when combined with radiation, genistein further increased the ROS levels in A549 cells whereas decreasing the radiation-induced oxidative stress in MRC-5 cells, possibly via increasing the expression levels of Nrf2, GSH and HO-1. Moreover, radiation combined with genistein significantly increased cell apoptosis in A549 but not MRC-5 cells. Together, the results herein show that the intrinsic difference in the redox status of A549 and MRC-5 cells could be the target for genistein to selectively sensitize A549 cells to radiation, thereby leading to an increase in radiosensitivity for A549 cells.
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影响因子:
--
作者:
Acharya A;Das I;Chandhok D;Saha T
通讯作者:
Saha T
影响因子:
3.9
作者:
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通讯作者:
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DOI:
10.1073/pnas.1305687110
发表时间:
2013-09-17
影响因子:
11.1
作者:
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通讯作者:
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影响因子:
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通讯作者:
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