Involvement of Nrf2 in proteasome inhibition-mediated induction of ORP150 in thyroid cancer cells
Involvement of Nrf2 in proteasome inhibition-mediated induction of ORP150 in thyroid cancer cells
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DOI：
10.18632/oncotarget.6636
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
Wang Hua-Qin
中科院分区：
文献类型：
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作者：
Zong Zhi-Hong;Du Zhen-Xian;Zhang Hai-Yan;Li Chao;An Ming-Xin;Li Si;Yao Han-Bing;Wang Hua-Qin
Oxygen-regulated protein 150 (ORP150) is an inducible ER chaperone by numerous cellular insults and sustains cellular viability. We have previously reported that ORP150 is differentially induced in a panel thyroid cancer cells and represents as an unwanted molecular consequence during exposure to proteasome inhibition. However, the molecular basis for induction of ORP150 by proteasome inhibitors in thyroid cancer cells remains unclear. In the current study, we found that -421/-307 and -243/+53 regions at the ORP150 gene were responsible for its transactivation by MG132 in thyroid cancer cells. Nrf2 directly transactivated the ORP150 gene by direct binding with the -421/-307 region. Nrf2 also indirectly activated OPR150 transcription via facilitating recruitment of ATF4 to the -243/+53 region. Collectively, this study highlights the molecular mechanism by which proteasome inhibition stimulates ORP150 expression via Nrf2 in thyroid cancer cells.
