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HIF-1 and NDRG2 contribute to hypoxia-induced radioresistance of cervical cancer Hela cells.

Abstract：

:Hypoxia inducible factor 1 (HIF-1), the key mediator of hypoxia signaling pathways, has been shown involved in hypoxia-induced radioresistance. However, the underlying mechanisms are unclear. The present study demonstrated that both hypoxia and hypoxia mimetic cobalt chloride could increase the radioresistance of human cervical cancer Hela cells. Meanwhile, ectopic expression of HIF-1 could enhance the resistance of Hela cells to radiation, whereas knocking-down of HIF-1 could increase the sensitivity of Hela cells to radiation in the presence of hypoxia. N-Myc downstream-regulated gene 2 (NDRG2), a new HIF-1 target gene identified in our lab, was found to be upregulated by hypoxia and radiation in a HIF-1-dependent manner. Overexpression of NDRG2 resulted in decreased sensitivity of Hela cells to radiation while silencing NDRG2 led to radiosensitization. Moreover, NDRG2 was proved to protect Hela cells from radiation-induced apoptosis and abolish radiation-induced upregulation of Bax. Taken together, these data suggest that both HIF-1 and NDRG2 contribute to hypoxia-induced tumor radioresistance and that NDRG2 acts downstream of HIF-1 to promote radioresistance through suppressing radiation-induced Bax expression. It would be meaningful to further explore the clinical application potential of HIF-1 and NDRG2 blockade as radiosensitizer for tumor therapy.

journal_name

Exp Cell Res

journal_title

Experimental cell research

authors

Liu J,Zhang J,Wang X,Li Y,Chen Y,Li K,Zhang J,Yao L,Guo G

doi

10.1016/j.yexcr.2010.02.028

subject

Has Abstract

pub_date

2010-07-15 00:00:00

pages

1985-93

issue

12

eissn

0014-4827

issn

1090-2422

pii

S0014-4827(10)00090-X

journal_volume

316

pub_type

杂志文章

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