Iron regulatory proteins control a mucosal block to intestinal iron absorption


Mammalian iron metabolism is regulated systemically by the hormone hepcidin and cellularly by iron regulatory proteins (IRPs) that orchestrate a posttranscriptional regulatory network. Through ligand-inducible genetic ablation of both IRPs in the gut epithelium of adult mice, we demonstrate that IRP deficiency impairs iron absorption and promotes mucosal iron retention via a ferritin-mediated "mucosal block." We show that IRP deficiency does not interfere with intestinal sensing of body iron loading and erythropoietic iron need, but rather alters the basal expression of the iron-absorption machinery. IRPs thus secure sufficient iron transport across absorptive enterocytes by restricting the ferritin "mucosal block" and define a basal set point for iron absorption upon which IRP-independent systemic regulatory inputs are overlaid.


Projects: B1.3: Linking modulation of iron metabolism with the impact of macrophag...

Cell Rep
Cell Rep 3(3): 844-57
21st Mar 2013

Bruno Galy, Dunja Ferring-Appel, Christiane Becker, Norbert Gretz, Hermann-Josef Gröne, Klaus Schümann, Matthias W Hentze

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[Bruno Galy] [Matthias Hentze]

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Views: 2144
  • Created: 14th Jan 2014 at 14:38

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