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A chemical screen identifies small molecules that regulate hepcidin expression.

Vera Gaun1, Bonnie Patchen1, Josephine Volovetz1

  • 1Division of Hematology/Oncology, Beth Israel Deaconess Medical Center, 330 Brookline Avenue, Boston, MA 02215, United States; Department of Medicine, Harvard Medical School, 330 Brookline Avenue, Boston, MA 02215, United States.

Blood Cells, Molecules & Diseases
|July 8, 2014
PubMed
Summary
This summary is machine-generated.

Researchers screened 10,169 chemicals to find compounds that increase hepcidin (a key iron-regulating hormone) production. This work identified 16 potential drug candidates for treating iron overload disorders.

Keywords:
Bone morphogenic proteinHemochromatosisInterleukin-6Stat3Thalassemia

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Pharmacology

Background:

  • Hepcidin is a liver-produced peptide hormone regulating iron homeostasis by controlling iron absorption and release.
  • Dysregulation of hepcidin, particularly low levels, is implicated in iron overload syndromes, making it a therapeutic target.
  • Bone morphogenic protein (BMP) and Stat3 signaling pathways are known regulators of hepcidin transcription.

Purpose of the Study:

  • To develop a high-throughput screening tool to identify small molecules that modulate hepcidin expression.
  • To discover novel chemical compounds that can upregulate hepcidin levels for potential therapeutic applications in iron overload.

Main Methods:

  • A reporter construct with the human hepcidin promoter linked to a firefly luciferase gene was stably transfected into human hepatocytes (HepG2 cells).
  • High-throughput screening of 10,169 chemicals was performed in duplicate to assess effects on hepcidin expression and cell viability.
  • Criteria for identifying regulators included significant changes in reporter gene activity (z-score >3 or <1) and maintained cell viability.

Main Results:

  • Sixteen chemicals were identified as promoting hepcidin expression across diverse functional classes.
  • All identified compounds showed increased expression of bone morphogenic protein-dependent and/or Stat3-dependent genes.
  • None of the identified compounds significantly increased the phosphorylation of Smad1,5,8 or Stat3, suggesting novel regulatory mechanisms.

Conclusions:

  • The study successfully established a screening platform for identifying hepcidin modulators.
  • Sixteen novel compounds that upregulate hepcidin expression were discovered, offering potential therapeutic leads for iron overload.
  • The identified compounds appear to act through BMP and/or Stat3 pathways without directly activating the canonical Smad or Stat3 phosphorylation cascades.