Journal
SCIENTIFIC REPORTS
Volume 7, Issue -, Pages -Publisher
NATURE PORTFOLIO
DOI: 10.1038/s41598-017-05685-3
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Funding
- Singapore National Research Foundation [R-713-005-014-271, R-713-000-162-511]
- Singapore Ministry of Education under the Research Centres of Excellence Programme
- Singapore Ministry of Health's National Medical Research Council [NMRC/CIRG/1389/2014]
- Terry Fox Foundation
- Swedish Research Council
- Swedish Cancer Society
- Swedish Childhood Cancer Foundation
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Hypoxia-inducible factors (HIFs) play a central role in the transcriptional response to changes in oxygen availability. Stability of HIFs is regulated by multi-step reactions including recognition by the von Hippel-Lindau tumour suppressor protein (pVHL) in association with an E3 ligase complex. Here we show that pVHL physically interacts with fatty acid synthase (FASN), displacing the E3 ubiquitin ligase complex. This results in HIF-alpha protein stabilization and activation of HIF target genes even in normoxia such as during adipocyte differentiation. 25-hydroxycholesterol (25-OH), an inhibitor of FASN expression, also inhibited HIF target gene expression in cultured cells and in mouse liver. Clinically, FASN is frequently upregulated in a broad variety of cancers and has been reported to have an oncogenic function. We found that upregulation of FASN correlated with induction of many HIF target genes, notably in a malignant subtype of prostate tumours. Therefore, pVHL-FASN interaction plays a regulatory role for HIFs and their target gene expression.
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