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Hypoxia inducible factor-1 (HIF-1) is a heterodimeric transcription factor composed of a HIF-1α subunit and HIF-1β subunit. Whereas the HIF-1β subunit is constitutively expressed, the HIF-1α subunit is regulated by cellular oxygen levels and therefore plays an important role in maintaining cellular oxygen homeostasis.1,2 Under normoxic conditions, HIF-1α is selectively hydroxylated on proline residues 402 and 577 and targeted for destruction by the ubiquitin-proteasome system. Under hypoxic conditions, HIF-1α accumulates and dimerizes with HIF-1β to promote the transcription of a number of genes involved in angiogenesis, glycolysis, growth factor signaling, tumor invasion, and metastasis.CAY10585 is a novel small molecule inhibitor of HIF-1α accumulation and gene transcriptional activity.3 In a gene reporter assay using human Hep3B and AGS cell lines, CAY10585 prevented HIF-1 transcriptional activity with IC50 values of 2.6 and 0.7 µM, respectively. It blocks HIF-1α accumulation in Hep3B cells in a concentration and time-dependent manner, with complete inhibition at a concentration of 30 µM within 12 hours. CAY10585 also significantly suppresses transcription of the HIF-1 target genes VEGF and erythropoietin at 10 µM.3
1
Wang, G.L., Jiang, B., Rue, E.A., et al. Hypoxia-inducible factor 1 is a basic-helix-loop-helix-PAS heterodimer regulated by cellular O2 tension. Proc Natl Acad Sci USA925510-5514(1995).
2
Safran, M., and Kaelin, W.G. HIF hydroxylation and the mammalian oxygen-sensing pathway. J Clin Invest111779-783(2003).
3
Lee, K., Lee, J.H., Boovanahalli, S.K., et al. (Aryloxyacetylamino)benzoic acid analogues: A new class of hypoxia-inducible factor-1 inhibitors. J Med Chem501675-1684(2007).
Wang, G.L., Jiang, B., Rue, E.A., et al. Hypoxia-inducible factor 1 is a basic-helix-loop-helix-PAS heterodimer regulated by cellular O2 tension. Proc Natl Acad Sci USA925510-5514(1995).
Safran, M., and Kaelin, W.G. HIF hydroxylation and the mammalian oxygen-sensing pathway. J Clin Invest111779-783(2003).
Lee, K., Lee, J.H., Boovanahalli, S.K., et al. (Aryloxyacetylamino)benzoic acid analogues: A new class of hypoxia-inducible factor-1 inhibitors. J Med Chem501675-1684(2007).
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