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Am J Physiol Gastrointest Liver Physiol. 2015 Jun 15;308(12):G1019-26. doi: 10.1152/ajpgi.00324.2014. Epub 2015 Apr 23.

The small molecule ferristatin II induces hepatic hepcidin expression in vivo and in vitro.

Author information

1
Department of Genetic and Complex Diseases, Harvard School of Public Health, Boston, Massachusetts;
2
Department of Pharmaceutical Sciences, Northeastern University, Boston, Massachusetts; and.
3
Division of Hematology/Oncology, Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts.
4
Department of Genetic and Complex Diseases, Harvard School of Public Health, Boston, Massachusetts; wessling@hsph.harvard.edu.

Abstract

Previous studies have shown that administration of ferristatin II to rats is associated with decreased serum iron, reduced transferrin saturation, and increased hepatic hepcidin expression. BMP and IL-6 signaling act via Smad and Stat3 transcription factors, respectively, to increase expression of hepcidin, the master regulator of iron metabolism. In this study, we aimed to explore the underlying mechanism of ferristatin II action on hepcidin production. We found that ferristatin II greatly increased hepcidin expression both in vivo and in vitro. In the rat liver, ferristatin II treatment decreased expression of Smad downstream targets Smad7 and Id1 and increased expression of Stat3 downstream targets α-2-macroglobulin, α-1-acid glycoprotein, and C-reactive peptide. Ferristatin II also increased Stat3 phosphorylation in the rat liver without affecting serum or hepatic IL-6 levels. It is unclear whether the Stat3 activation observed in vivo is a cause or a consequence to hepcidin induction. Reporter gene expression studies demonstrated that ferristatin II synergized with BMP6 and IL-6 to enhance hepcidin expression in vitro. However, this synergy was not due to activation of either Smad or Stat3 signaling, raising the possibility that ferristatin II may activate a novel pathway for hepcidin regulation.

KEYWORDS:

BMP6; IL-6; hemochromatosis; iron transport

PMID:
25907691
PMCID:
PMC4469869
DOI:
10.1152/ajpgi.00324.2014
[Indexed for MEDLINE]
Free PMC Article

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