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- W2027705428 abstract "The HIF-1 transcription factor drives hypoxic gene expression changes that are thought to be adaptive for cells exposed to a reduced-oxygen environment. For example, HIF-1 induces the expression of glycolytic genes. It is presumed that increased glycolysis is necessary to produce energy when low oxygen will not support oxidative phosphorylation at the mitochondria. However, we find that while HIF-1 stimulates glycolysis, it also actively represses mitochondrial function and oxygen consumption by inducing pyruvate dehydrogenase kinase 1 (PDK1). PDK1 phosphorylates and inhibits pyruvate dehydrogenase from using pyruvate to fuel the mitochondrial TCA cycle. This causes a drop in mitochondrial oxygen consumption and results in a relative increase in intracellular oxygen tension. We show by genetic means that HIF-1-dependent block to oxygen utilization results in increased oxygen availability, decreased cell death when total oxygen is limiting, and reduced cell death in response to the hypoxic cytotoxin tirapazamine." @default.
- W2027705428 created "2016-06-24" @default.
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- W2027705428 date "2006-03-01" @default.
- W2027705428 modified "2023-10-14" @default.
- W2027705428 title "HIF-1 mediates adaptation to hypoxia by actively downregulating mitochondrial oxygen consumption" @default.
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- W2027705428 doi "https://doi.org/10.1016/j.cmet.2006.01.012" @default.
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