Prolyl-4-hydroxylase 3 maintains β-cell glucose metabolism during fatty acid excess in mice

Daniela Nasteska, Federica Cuozzo, Katrina Viloria, Elspeth M. Johnson, Alpesh Thakker, Rula Bany Bakar, Rebecca L. Westbrook, Jonathan P. Barlow, Monica Hoang, Jamie W. Joseph, Gareth G. Lavery, Ildem Akerman, James Cantley, Leanne Hodson, Daniel A. Tennant (Lead / Corresponding author), David J. Hodson (Lead / Corresponding author)

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Abstract

The α-ketoglutarate-dependent dioxygenase, prolyl-4-hydroxylase 3 (PHD3), is an HIF target that uses molecular oxygen to hydroxylate peptidyl prolyl residues. Although PHD3 has been reported to influence cancer cell metabolism and liver insulin sensitivity, relatively little is known about the effects of this highly conserved enzyme in insulin-secreting β cells in vivo. Here, we show that the deletion of PHD3 specifically in β cells (βPHD3KO) was associated with impaired glucose homeostasis in mice fed a high-fat diet. In the early stages of dietary fat excess, βPHD3KO islets energetically rewired, leading to defects in the management of pyruvate fate and a shift from glycolysis to increased fatty acid oxidation (FAO). However, under more prolonged metabolic stress, this switch to preferential FAO in βPHD3KO islets was associated with impaired glucose-stimulated ATP/ADP rises, Ca2+ fluxes, and insulin secretion. Thus, PHD3 might be a pivotal component of the β cell glucose metabolism machinery in mice by suppressing the use of fatty acids as a primary fuel source during the early phases of metabolic stress.

Original languageEnglish
Article numbere140288
Number of pages21
JournalJCI Insight
Volume6
Issue number16
Early online date15 Jul 2021
DOIs
Publication statusPublished - 23 Aug 2021

Keywords

  • Endocrinology
  • Metabolism

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