ATF4 and IRE1α inhibit DNA repair protein DNA-dependent protein kinase 1 induced by heat shock

被引:9
作者
Zhu, Huifang [1 ]
Guo, Feng-Jin [2 ]
Zhao, Wenjun [2 ]
Zhou, Jinghua [2 ]
Liu, Yanna [2 ]
Song, Fangzhou [1 ]
Wang, Yingxiong [3 ]
机构
[1] Chongqing Med Univ, Dept Biochem & Mol Biol, Mol Med & Canc Res Ctr, Chongqing 400016, Peoples R China
[2] Chongqing Med Univ, Core Facil Dev Biol, Dept Cell Biol & Genet, Chongqing 400016, Peoples R China
[3] Chongqing Med Univ, Reprod Biol Lab, Chongqing 400016, Peoples R China
基金
美国国家科学基金会;
关键词
Heat shock; ER stress; DNA repair; DNA-PKcs; XRCC1; DOUBLE-STRAND BREAKS; POLY(ADP-RIBOSE) POLYMERASE; CELLS; STRESS; DAMAGE; BETA; RADIATION; PATHWAY; XRCC1;
D O I
10.1007/s11010-012-1439-z
中图分类号
Q2 [细胞生物学];
学科分类号
071009 ; 090102 ;
摘要
With the increase of environment temperature, more and more attentions are payed to the effects of heat stress. Cells under heat shock either are adapted to the condition or are damaged and dead. In this paper, we found that heat shock induced endoplasmic reticulum (ER) stress. ATF4, PERK, and IRE1 alpha were induced by heat shock of 45 A degrees C in the transcriptional level. Under the stress of 45 A degrees C, PERK was phosphorylated and XBP1s was detected. The result indicated that heat shock could induce the ER stress. We found that heat shock of 45 A degrees C induced the dysregulation of HSP70 and DNA-PKcs, and downregulated the expression of PARP1 and XRCC1. Further results showed that after the knockdown of ATF4 or IRE1 alpha, the expression of DNA-PKcs and XRCC1 were increased. It was indicated that ATF4 and IRE1 alpha could inhibit the expression of DNA-PKcs and XRCC1 under the heat stress. Our results suggested that heat shock could activate ER stress. IRE1 alpha and ATF4, as the important ER stress molecules, could inhibit the expression of DNA repair proteins DNA-PKcs, XRCC1, and HSP70 under heat shock. Downregulation of DNA repair proteins could aggravate the cell damage that may cause cell apoptosis. This may explain that heat shock could increase the lethality of chemotherapeutic drugs on tumor cells.
引用
收藏
页码:225 / 232
页数:8
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