Intestinal hypoxia-inducible transcription factors are essential for iron absorption following iron deficiency

Cell Metab. 2009 Feb;9(2):152-64. doi: 10.1016/j.cmet.2008.12.012. Epub 2009 Jan 15.

Abstract

Iron deficiency and iron overload are among the most prevalent nutritional disorders worldwide. Duodenal cytochrome b (DcytB) and divalent metal transporter 1 (DMT1) are regulators of iron absorption. Their expression is increased during high systemic requirements for iron, but the molecular mechanisms that regulate DcytB and DMT1 expression are undefined. Hypoxia-inducible factor (HIF) signaling was induced in the intestine following acute iron deficiency in the duodenum, resulting in activation of DcytB and DMT1 expression and an increase in iron uptake. DcytB and DMT1 were demonstrated as direct HIF-2alpha target genes. Genetic disruption of HIF signaling in the intestine abolished the adaptive induction of iron absorption following iron deficiency, resulting in low systemic iron and hematological defects. These results demonstrate that HIF signaling in the intestine is a critical regulator of systemic iron homeostasis.

Publication types

  • Research Support, N.I.H., Intramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Aryl Hydrocarbon Receptor Nuclear Translocator / metabolism
  • Basic Helix-Loop-Helix Transcription Factors / metabolism*
  • Cation Transport Proteins / metabolism
  • Cytochrome b Group / metabolism
  • Duodenum / metabolism
  • Hypoxia-Inducible Factor 1 / metabolism*
  • Hypoxia-Inducible Factor 1, alpha Subunit / metabolism
  • Iron / deficiency
  • Iron / metabolism*
  • Mice
  • Mice, Inbred C57BL
  • Mice, Transgenic
  • Oxidoreductases / metabolism
  • Signal Transduction

Substances

  • Basic Helix-Loop-Helix Transcription Factors
  • Cation Transport Proteins
  • Cytochrome b Group
  • Hypoxia-Inducible Factor 1
  • Hypoxia-Inducible Factor 1, alpha Subunit
  • solute carrier family 11- (proton-coupled divalent metal ion transporters), member 2
  • Aryl Hydrocarbon Receptor Nuclear Translocator
  • endothelial PAS domain-containing protein 1
  • Iron
  • Oxidoreductases
  • CYBRD1 protein, human