HIF1-alpha is a subunit HIF1, which is a transcription factor found in mammalian cells cultured under reduced oxygen tension. HIF1 functions as a transcriptional regulator of the adaptive response to hypoxia. HIF1-alpha regulates hypoxia-mediated apoptosis, cell proliferation and tumour angiogenesis. Hypoxia which induces p53 protein accumulation, directly interacts with HIF1-alpha and reduces hypoxia-induced expression of HIF1-alpha by promoting MDM2-mediated ubiquitination and proteasomal degradation under hypoxic conditions. Recent studies suggests that induction of NOX4 by HIF1-alpha contributes to maintain ROS levels after hypoxia and hypoxia-induced proliferation. In humans, it is located on the q arm of chromosome 14.
alpha subunit (basic helix-loop-helix transcription factor); ARNT interacting protein; ARNT-interacting protein; Basic-helix-loop-helix-PAS protein MOP1; bHLHe78; Class E basic helix-loop-helix protein 78; HIF-1-alpha; HIF-1alpha; HIF1; HIF1-ALPHA; hypoxia inducible factor 1, alpha subunit (basic helix-loop-helix transcription factor); hypoxia-inducible factor 1; hypoxia-inducible factor 1 alpha isoform I.3; hypoxia-inducible factor 1, alpha subunit (basic helix-loop-helix transcription factor); Hypoxia-inducible factor 1-alpha; hypoxia-inducible factor1alpha; Member of PAS protein 1; member of PAS superfamily 1; MOP1; PAS domain-containing protein 8; PASD8
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