Key Points
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Hypoxia and the cellular hypoxic response have key roles in homeostasis and physiological adaptations, as well as in pathophysiological conditions.
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The cellular hypoxic response can generate both diversity and specificity in the downstream signalling output, despite a relatively simple core signalling pathway.
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Hypoxia-inducible factor-α proteins constitute key transcriptional regulators in the cellular hypoxic response, and are subject to various different post-translational modifications.
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Analysis of the hypoxia transcriptional response has begun to reveal a core hypoxic transcriptional signature in addition to cell type-specific gene activation events.
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The transcriptional responses to acute and chronic hypoxia are distinct. Likewise, hypoxia-mimicking chemical compounds have a substantially broader transcriptional output than hypoxia.
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Intersections with other signalling mechanisms, such as Myc and Notch signalling, contribute to modulation of the hypoxic response.
Abstract
The sensing of oxygen levels and maintenance of oxygen homeostasis is crucial for cells. The hypoxic-sensitive regulation of gene expression allows information about the oxygen status to be converted into appropriate cellular responses. Although there is a core transcriptional pathway, the signalling cascade can be modified to allow diversity and specificity in the transcriptional output. In this Review, we discuss recent advances in our understanding of the mechanisms and factors that contribute to the observed diversity and specificity. A deeper knowledge about how hypoxic signalling is tuned will further our understanding of the cellular hypoxic response in normal physiology and how it becomes derailed in disease.
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Acknowledgements
We apologize that we are unable to discuss all observations that are relevant to the modulation of HIF function owing to space limitations. This work was supported by the Swedish Research Council, the Swedish Cancer Society, the European Union, the Singapore National Research Foundation and the Singapore Ministry of Education under the Research Center of Excellence Programme.
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Glossary
- Oxidative phosphorylation
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An aerobic, oxygen-dependent process in which electrons are transferred from electron donors to acceptors through a series of redox reactions in mitochondria. The resulting proton gradient across the inner mitochondrial membrane is used to make ATP from NADH produced, for example, by the citric acid cycle or glycolysis.
- Glycolysis
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The metabolic pathway that converts glucose to pyruvate, which is accompanied by energy generation in the form of ATP and NADH. Monosaccharides, such as fructose and galactose, can also be metabolized in the glycolytic pathway. Under anaerobic conditions, pyruvate can be further processed to lactate. Glycolysis produces considerably less ATP per metabolized glucose molecule than oxidative phosphorylation.
- Familial erythrocytosis
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Erythrocytosis is an increase in the number of red blood cells caused, for example, by emphysema, heart failure or respiratory diseases. The familial form is a rare inherited disorder in which the increase in red blood cells is not accompanied by an increase in white blood cells.
- Chuvash polycythaemia
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A disease in which excess numbers of red blood cells are formed, which is often associated with elevated haematocrit levels. Some forms of polycythaemia are caused by defects in the bone marrow or increased erythropoietin production, whereas the familial form, Chuvash polycythaemia, is caused by mutations in the von Hippel–Lindau protein.
- Gluconeogenesis
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A metabolic pathway that is used to maintain cellular or blood glucose levels and to avoid hypoglycaemia. In gluconeogenesis, glucose is generated from non-carbohydrates, such as lactate, glycerol and amino acids.
- Warburg effect
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The observation by Warburg in the 1920s that, in contrast to normal differentiated cells, which rely primarily on mitochondrial oxidative phosphorylation to generate energy, tumour cells exhibit increased aerobic glycolysis and use of glucose. Although aerobic glycolysis was initially proposed by Warburg to be due to mitochondrial impairment, recent studies have shown a preferential switch to glycolysis in tumour cells with functional mitochondria.
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Lendahl, U., Lee, K., Yang, H. et al. Generating specificity and diversity in the transcriptional response to hypoxia. Nat Rev Genet 10, 821–832 (2009). https://doi.org/10.1038/nrg2665
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DOI: https://doi.org/10.1038/nrg2665
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