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Updated: May 13, 2026

Co-immunoprecipitation Assay Using Endogenous Nuclear Proteins from Cells Cultured Under Hypoxic Conditions
Published on: August 2, 2018
HIF1-regulated ATRIP expression is required for hypoxia induced ATR activation
Gang Ding1, He-Dai Liu, Hong-Xiang Liang
1Department of Oncology, Chongming Branch of Xinhua Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, PR China. dinggangcm@gmail.com
Abstract:
The ATR-ATRIP protein kinase complex plays a crucial role in the cellular response to replication stress and DNA damage. Recent studies found that ATR could be activated in response to hypoxia and be involved in hypoxia-induced genetic instability in cancer cells. However, the underlying mechanisms for ATR activation in response to hypoxic stress are still not fully understood. We reported that ATRIP is a direct target of HIF-1. Silencing the expression of HIF-1α in cancer cells by RNA interference abolished hypoxia-induced ATRIP expression. Silencing the expression of ATRIP by RNA interference abolished hypoxia induced ATR activation and CHK1 phosphorylation in cancer cells. Taken together, these data shed novel insights on the mechanism of hypoxia-induced activation of the ATR pathway.
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