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http://purl.uniprot.org/citations/25186293http://www.w3.org/1999/02/22-rdf-syntax-ns#typehttp://purl.uniprot.org/core/Journal_Citation
http://purl.uniprot.org/citations/25186293http://www.w3.org/2000/01/rdf-schema#comment"

Aim/hypothesis

Different studies have linked hypoxia to embryonic development. Specifically, when embryonic pancreases are cultured ex vivo under hypoxic conditions (3% O2), beta cell development is impaired. Different cellular signalling pathways are involved in adaptation to hypoxia, including the ubiquitous hypoxia-inducible-factor 1-α (HIF1-α) pathway. We aimed to analyse the effects of HIF1-α stabilisation on fetal pancreas development in vivo.

Methods

We deleted the Vhl gene, which encodes von Hippel-Lindau protein (pVHL), a factor necessary for HIF1-α degradation, by crossing Vhl-floxed mice with Sox9-Cre mice.

Results

HIF1-α was stabilised in pancreatic progenitor cells in which the HIF pathway was induced. The number of neurogenin-3 (NGN3)-expressing cells was reduced and consequently endocrine development was altered in Vhl knockout pancreases. HIF1-α stabilisation induced Vegfa upregulation, leading to increased vascularisation. To investigate the impact of increased vascularisation on NGN3 expression, we used a bioassay in which Vhl mutant pancreases were cultured with or without vascular endothelial growth factor (VEGF) receptor 2 (VEGF-R2) inhibitors (e.g. Ki8751). Ex vivo analysis showed that Vhl knockout pancreases developed fewer NGN3-positive cells compared with controls. Interestingly, this effect was blocked when vascularisation was inhibited in the presence of VEGF-R2 inhibitors.

Conclusions/interpretation

Our data demonstrate that HIF1-α negatively controls beta cell differentiation in vivo by regulating NGN3 expression, and that this effect is mediated by signals from blood vessels."xsd:string
http://purl.uniprot.org/citations/25186293http://purl.org/dc/terms/identifier"doi:10.1007/s00125-014-3365-y"xsd:string
http://purl.uniprot.org/citations/25186293http://purl.uniprot.org/core/author"Scharfmann R."xsd:string
http://purl.uniprot.org/citations/25186293http://purl.uniprot.org/core/author"Akiyama H."xsd:string
http://purl.uniprot.org/citations/25186293http://purl.uniprot.org/core/author"Duvillie B."xsd:string
http://purl.uniprot.org/citations/25186293http://purl.uniprot.org/core/author"Soggia A."xsd:string
http://purl.uniprot.org/citations/25186293http://purl.uniprot.org/core/author"Ramond C."xsd:string
http://purl.uniprot.org/citations/25186293http://purl.uniprot.org/core/date"2014"xsd:gYear
http://purl.uniprot.org/citations/25186293http://purl.uniprot.org/core/name"Diabetologia"xsd:string
http://purl.uniprot.org/citations/25186293http://purl.uniprot.org/core/pages"2348-2356"xsd:string
http://purl.uniprot.org/citations/25186293http://purl.uniprot.org/core/title"von Hippel-Lindau gene disruption in mouse pancreatic progenitors and its consequences on endocrine differentiation in vivo: importance of HIF1-alpha and VEGF-A upregulation."xsd:string
http://purl.uniprot.org/citations/25186293http://purl.uniprot.org/core/volume"57"xsd:string
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