Please use this identifier to cite or link to this item: https://doi.org/10.1371/journal.pone.0010522
Title: Inhibition of Hypoxia-Inducible Factor-1α (HIF-1α) Protein Synthesis by DNA damage inducing agents
Authors: Lou, J.J.W.
Chua, Y.L.
Chew, E.H. 
Gao, J.
Bushell, M.
Hagen, T.
Issue Date: 2010
Source: Lou, J.J.W., Chua, Y.L., Chew, E.H., Gao, J., Bushell, M., Hagen, T. (2010). Inhibition of Hypoxia-Inducible Factor-1α (HIF-1α) Protein Synthesis by DNA damage inducing agents. PLoS ONE 5 (5) : -. ScholarBank@NUS Repository. https://doi.org/10.1371/journal.pone.0010522
Abstract: Hypoxia-inducible factor (HIF) is a heterodimeric transcription factor that is composed of a hypoxia-inducible α subunit (HIF- 1α and HIF-2α) and a constitutively expressed β subunit (HIF-1β). HIF mediates the adaptation of cells and tissues to low oxygen concentrations. It also plays an important role in tumorigenesis and constitutes an important therapeutic target in anti-tumor therapy. We have screened a number of reported HIF inhibitors for their effects on HIF-transcriptional activity and found that the DNA damage inducing agents camptothecin and mitomycin C produced the most robust effects. Camptothecin is a reported inhibitor of HIF-1α translation, while mitomycin C has been reported to induce p53-dependent HIF-1α degradation. In this study we demonstrate that the inhibitory effect of mitomycin C on HIF-1α protein expression is not dependent on p53 and protein degradation, but also involves HIF-1α translational regulation. Initiation of a DNA damage response with the small molecule p53 activator NSC-652287 (RITA) has been reported to inhibit HIF-1α protein synthesis by increasing the phosphorylation of eIF2a. However, we show here that even when eIF2α phosphorylation is prevented, the DNA damage inducing drugs mitomycin C, camptothecin and NSC-652287 still inhibit HIF-1α protein synthesis to the same extent. The inhibitory effects of camptothecin on HIF-1α expression but not that of mitomycin C and NSC-652287 were dependent on cyclin-dependent kinase activity. In conclusion, specific types of DNA damage can bring about selective inhibition of HIF-1α protein synthesis. Further characterization of the involved mechanisms may reveal important novel therapeutic targets. © 2010 Lou et al.
Source Title: PLoS ONE
URI: http://scholarbank.nus.edu.sg/handle/10635/106064
ISSN: 19326203
DOI: 10.1371/journal.pone.0010522
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