HIF1 alpha Antibody: FITC

Hypoxia-inducible factor 1 (HIF1) is a heterodimeric transcription factor that plays a critical role in the cellular response of hypoxia (1). The HIF1 complex consists of two subunits, HIF1-Alpha and HIF1-Beta, which are basic helix-loop-helix proteins of the PAS family (2). HIF1 regulates the transcription of a broad range of genes that facilitate responses to the hypoxic environment, including genes regulating angiogenesis, erythropoiesis, cell cycle, metabolism and apoptosis. The widely expressed HIF-1α is typically degraded rapidly in normoxic cells by the ubiquitin/proteasomal pathway. Under normoxic conditions, HIF-1α is proline hydroxylated leading to a conformational change that promotes binding to the von Hippel Lindau protein (VLH) E3 ligase complex; ubiquitination and proteasomal degradation follows (3, 4). Both hypoxic conditions and chemical hydroxylase inhibitors (such as desferrioxamine and cobalt) inhibit HIF-1α degradation and lead to its stabilization. In addition, HIF-1α can be induced in an oxygen-independent manner by various cytokines through the PI3K-AKT-mTOR pathway (5-7).

1 µg/ml of SMC-184 was sufficient for detection of HIF1α in 20 µg of CoCl2-induced Hela cell lysate by colorimetric immunoblot analysis using Goat anti-mouse IgG:HRP as the secondary antibody.

1. Sharp F.R. and Bernaudin M. (2004) Nat Rev Neurosci 5: 437-48. 2. Wang G.L., et al. (1995) Proc Natl Acad Sci U S A 92: 5510-4. 3. Jaakkola P., et al. (2001) Science 292: 468-72. 4. Maxwell P.H., et al. (1999) Nature 399: 271-5. 5. Fukuda R., et al. (2002) J Biol Chem 277: 38205-11. 6. Jiang B.H., et al. (2001) Cell Growth Differ 12: 363-9. 7. Laughner E., et al. (2001) Mol Cell Biol 21: 3995-4004.