What is the role of HIF-1?

HIF-1 Regulates Oxygen Homeostasis HIF-1 is a major regulator of oxygen homeostasis within cells. As a transcription factor, it affects and regulates the expression of dozens of genes involved in maintaining homeostasis as oxygen concentrations change [13].

Is HIF-1 a tumor suppressor?

HIF-1 inhibitors block tumor growth and vascularization DNA intercalating drugs, including echinomycin (Kong et al., 2005) and anthracyclines, such as doxorubicin (Adriamycin) and daunorubicin (Lee et al., 2009), inhibit HIF-1 transcriptional activity by blocking its binding to DNA.

How is HIF-1 activated?

At the heart of the HIF-1 system, molecular oxygen reacts with HIF-α proteins in a way that switches their ability to interact with other proteins (Figure 1). The HIF-α chain is regulated by two enzymatic reactions in which molecular oxygen reacts with specific amino acid residues (7–9⇓⇓).

What genes are regulated by HIF?

The target genes regulated by HIF-1α are mainly EPO, VEGF, HO-1, ADM, and Glut-1. EPO is the first identified gene related to hypoxia which in turn led to the discovery of HIF (Semenza and Wang, 1992).

Who discovered HIF-1 alpha?

Discovery of the HIF-1 protein HIF-1 was initially discovered by Semenza and co-workers15 in 1991 during a study conducted on erythropoietin (EPO) gene, a gene responsible for encoding erythropoietin hormone for red blood cells production.

How does HIF increase performance?

HIF activates genes involved in two vital processes. The first is angiogenesis, the formation of blood vessels. The second is the production of hemoglobin, oxygen-carrying red blood cells. Both assist in delivering more oxygen to the places that need it.

Is HIF-1 alpha an oncogene?

HIF-1 is also activated in cancer cells by tumor suppressor (e.g., VHL) loss of function and oncogene gain of function (leading to PI3K/AKT/mTOR activity) and mediates metabolic alterations that drive cancer progression and resistance to therapy.

Does HIF activate VEGF?

HIF-1α is a transcription factor that under hypoxic conditions, accumulates in endothelial cells and can bind to VEGF gene promoter and induce VEGF gene expression. In order to activate the VEGF gene, HIF-1α must be transported to the nucleus.

What Is HIF in angiogenesis?

The oxygen-sensitive transcriptional activator HIF-1 (hypoxia-inducible factor-1) is a key transcriptional mediator of the response to hypoxic conditions. The HIF-1 pathway was found to be a master regulator of angiogenesis.

What is HIF biology?

HIF is a heterodimeric DNA-binding complex composed of two basic helix-loop-helix proteins of the PAS family (PER, AHR, ARNT and SIM family):3 the constitutive HIF-1β and one of either hypoxia-inducible α-subunits, HIF-1α or HIF-2α.

What is the HIF-1 gene?

HIF-1 functions as a master regulator of cellular and systemic homeostatic response to hypoxia by activating transcription of many genes, including those involved in energy metabolism, angiogenesis, apoptosis, and other genes whose protein products increase oxygen delivery or facilitate metabolic adaptation to hypoxia.

Is HIF-1 a protein?

HIF1A is a basic helix-loop-helix PAS domain containing protein, and is considered as the master transcriptional regulator of cellular and developmental response to hypoxia.

How does HIF increase oxygen?

Is hypoxic training beneficial?

Essentially, these adaptations help increase your resistance to fatigue, as well as increasing the efficiency of your oxygen usage and energy sources (glycogen and triglycerides) during exercise. Hypoxic training will help you perform more efficiently, for longer, and with less fatigue!

How does HIF increase performance through angiogenesis?

The lack of oxygen causes cancer cells to produce HIF. This activates the secretion of vascular endothelial cell growth factor (VEGF). VEGF triggers angiogenesis. The resulting new blood vessels supply oxygen and nutrients allowing the tumor to thrive.

Is HIF a growth factor?

Abstract. Aims: Hypoxia-inducible factor-1 (HIF-1) is the key transcription factor regulating the cellular response to hypoxia, including angiogenesis. Growth factors play an important role in tumour growth and angiogenesis and some have been shown to be induced by HIF-1 in vitro.

What does HIF bind to?

HIF-α binds chromatin in stoichiometric ratio with HIF-1β Classically, HIF binds to chromatin as a canonical heterodimer of α- and β-subunits 24, 33. However, several reports have described non-canonical associations of HIF-α subunits with other transcription factors 27-29.

What is HIF stabilization?

In hypoxic conditions, low oxygen leads to HIF-1α stabilization due to the inhibition of proline hydroxylation and subsequent decreases in HIF-1α ubiquitination and degradation. HIF-1α is stabilized and forms, in combination with the HIF-1β subunit, the active HIF-1 complex.

What is the HIF pathway?

Hypoxia-inducible factor (HIF) is an alpha,beta-heterodimeric transcription factor that mediates cellular responses to low oxygen concentration via the transcriptional activation of specific genes involved in both tumorogenesis and angiogenesis.