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Ferritin and ferritin isoforms I: Structure-function relationships, synthesis, degradation and secretion.

A M Koorts1, M Viljoen

  • 1Department of Physiology, School of Medicine, University of Pretoria, Pretoria, South Africa. akoorts@medic.up.ac.za

Archives of Physiology and Biochemistry
|May 25, 2007
PubMed
Summary

Ferritin is a protein that stores and releases iron for cells. Its structure and function vary, impacting iron bioavailability and cellular processes.

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Molecular Biology

Background:

  • Ferritin is the primary intracellular protein for iron sequestration, storage, and release.
  • It comprises 24 subunits (H and L) forming a shell capable of storing up to 4500 iron atoms.
  • Isoferritins, arising from varying subunit combinations, exhibit distinct functions influenced by cell type, proliferation, and disease state.

Purpose of the Study:

  • To elucidate the multifaceted roles of ferritin in iron homeostasis.
  • To explore the regulatory mechanisms governing ferritin synthesis and degradation.
  • To understand the functional diversity of isoferritins and their cellular implications.

Main Methods:

  • Analysis of ferritin structure and subunit composition (H and L subunits).
  • Investigation of transcriptional and translational regulation of ferritin synthesis.
  • Examination of ferritin degradation pathways (cytosolic and lysosomal) and their outcomes.
  • Study of ferritin localization within cellular compartments (cytosol, nucleus, mitochondria).

Main Results:

  • Ferritin's iron storage capacity is crucial for maintaining bioavailable iron levels.
  • Isoferritin populations are cell- and condition-specific, indicating specialized roles.
  • Iron-responsive elements regulate translation, while hormones and cytokines control transcription.
  • Degradation pathways influence iron release, haemosiderin formation, and iron toxicity protection.
  • Ferritin exists in various cellular locations, including cytosol, nucleus, and mitochondria.
  • Secreted ferritin can be internalized by other cells, suggesting intercellular roles.

Conclusions:

  • Ferritin is a key regulator of intracellular iron bioavailability through its storage and release functions.
  • The diversity of isoferritins contributes to specialized cellular functions and responses.
  • Complex regulatory mechanisms control ferritin levels, balancing synthesis and degradation.
  • Ferritin plays roles beyond iron storage, potentially influencing myelopoiesis and immune responses.