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Bone morphogenic proteins in iron homeostasis.

Xia Xiao1, Víctor M Alfaro-Magallanes2, Jodie L Babitt1

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The bone morphogenetic protein (BMP)-SMAD pathway regulates hepcidin, controlling iron levels in the body. Disruptions in this pathway lead to iron disorders, but modulators show promise for treatment.

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AnemiaBone morphogenetic proteinHemochromatosisHemojuvelinHepcidinIronSMAD

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Physiology

Background:

  • The bone morphogenetic protein (BMP)-SMAD signaling pathway is crucial for regulating hepcidin, the primary hormone controlling systemic iron homeostasis.
  • Hepcidin, produced by the liver, manages iron absorption and release by interacting with ferroportin, ensuring adequate iron for red blood cells while preventing toxicity.

Purpose of the Study:

  • To review recent insights into the BMP-SMAD pathway's role in hepcidin regulation and systemic iron homeostasis.
  • To discuss how this pathway integrates signals from iron levels, erythropoiesis, and inflammation.

Main Methods:

  • Literature review focusing on the BMP-SMAD pathway's molecular mechanisms in hepcidin regulation.
  • Analysis of genetic mutations and pharmacologic interventions affecting the pathway.

Main Results:

  • BMP ligands (BMP6, BMP2) activate SMAD1/5/8 signaling via BMP receptors and hemojuvelin (HJV) on hepatocytes, directly upregulating hepcidin transcription.
  • Dysregulation of the BMP-SMAD pathway, due to mutations in its components, causes iron-related disorders like hemochromatosis and iron-refractory iron deficiency anemia.
  • Pharmacologic modulators targeting the BMP-SMAD pathway have demonstrated efficacy in preclinical models for regulating hepcidin and treating iron disorders.

Conclusions:

  • The BMP-SMAD pathway is a central integrator of signals governing hepcidin production and systemic iron balance.
  • Understanding and targeting the BMP-SMAD pathway offers therapeutic potential for various iron metabolism disorders.