The Hypoxia-inducible factor (HIF) transcription complex, which is activated by low oxygen tension, controls a diverse range of cellular processes including angiogenesis, erythropoiesis, bronchodilatation, and cellular metabolism targeted at increasing oxygen delivery to tissues[1]. HIF consists of the subunits HIFα and HIFβ. Whereas the HIFβ subunit is constitutive, HIFα is tightly regulated by oxygen levels through various mechanisms that include protein stability, transcription co-activator recruitment and subcellular localization. The molecular mechanism that controls HIFα protein stability has been characterized in detail. In normoxia, HIFα is ubiquitinated and degraded at the 26S proteasome, while in hypoxia the protein is stabilized. HIFα ubiquitination in normoxia is mediated by the Von Hippel Lindau (VHL) tumor suppressor factor which is the substrate recognition subunit of a multimeric E3 ubiquitin ligase complex. Physical interaction between VHL and HIFα requires hydroxylation of 2 key prolyl residues in the HIFα sequence (P402 and P564 in human HIF-1α), which is catalyzed by the specific prolyl-4-hydroxylases, named PHD1- PHD2 and PHD3 (EC Under hypoxia, PHD hydroxylase activity is reduced; HIFα escapes hydroxylation and proteolysis, leading to HIF nuclear accumulation and transcriptional induction of target genes[2].

[1] S.S. Karuppagounder, R.R. Ratan. Hypoxia-inducible factor prolyl hydroxylase inhibition: robust new target or another big bust for stroke therapeutics? J. Cer. Blood Fl. Met. 2012, 32, 1347-1361.
[2] J.M. Acevedo, L. Centanin, A. Dekanty, P. Wappner. Oxygen Sensing in Drosophila: Multiple Isoforms of the Prolyl Hydroxylase Fatiga Have Different Capacity to Regulate HIFα/Sima. PLoS One. 2010; 5, e12390.

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Axon ID Name Description From price
1977 DMOG Cell-permeable HIF-PHD inhibitor with pro-angiogenic and -osteogenic properties €65.00
2570 FG-2216 Orally active HIF-PHD inhibitor that increases plasma EPO levels in vivo €80.00
2588 FG-4592 New-generation oral HIF-PHD inhibitor €55.00
3615 GSK1278863 Potent, selective and orally active HIF-PHD inhibitor €120.00
1948 HIF Phd Inhibitor 4 Inhibitor of Hypoxia Inducible Factor PHD €105.00
1921 IOX2 Inhibitor of Hypoxia Inducible Factor PHD €95.00
3095 MK-8617 Potent, orally active pan-inhibitor of HIF-PHD €90.00
3288 Vadadustat Oral HIF-PH inhibitor and HIF stabilizer €80.00

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