HIF-1: the knowns and unknowns of hypoxia sensing

• Autorzy: Zagorska A. , Dulak J.
• Języki publikacji: EN

Abstrakty

EN

Hypoxia-inducible factor-1 (HIF-1) is a transcriptional activator that functions as a master regulator of cellular and systemic oxygen homeostasis. It consists of two con- stitutively produced subunits: HIF-1a and HIF-1ß. Under normoxic conditions HIF-1a undergoes hydroxylation at specific prolyl residues which leads to an imme­diate ubiquitination and subsequent proteasomal degradation of the a subunit. Additionally, hydroxylation of an asparaginyl residue blocks the transcriptional activity of HIF-1 due to inhibition of its interaction with co-activators. In contrast, under hypoxic conditions, abolition of prolyl hydroxylation results in HIF-1 stabilization, whereas the lack of asparaginyl hydroxylation allows the transcriptional activity. Additionally, the transcriptional activity may be modulated by phosphorylation or redox modification of HIF-1. Despite its name, HIF-1 is induced not only in response to reduced oxygen availability but also by other stimulants, such as nitric oxide, various growth factors, or direct inhibitors of prolyl and asparaginyl hydroxylases. Therefore, it seems to be a crucial transcription factor elicited by a wide range of stresses such as impaired oxygenation, inflammation, energy deprivation, or intensive proliferation. However, the mechanisms of normoxic activation, as well as of oxygen sensing, are not yet fully known. Further understanding of the processes that control HIF-1 activity will be crucial for the development of new diagnostic and therapeutic strategies.

Słowa kluczowe

EN

hypoxia inducible factor-1; nitric oxide; asparaginyl hydroxylase; reactive oxygen species; angiogenesis; carbon monoxide; prolyl hydroxylase; heme oxygenase

• Wydawca: -
• Czasopismo: Acta Biochimica Polonica
• Rocznik: 2004
• Tom: 51
• Numer: 3
• Opis fizyczny: p.563-585,fig.,ref.

Twórcy

autor

Zagorska A.

• Jagiellonian University, Gronostajowa 7, 30-387 Krakow, Poland

autor

Dulak J.

Bibliografia

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