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Effect of iron chelators on labile iron and oxidative status of thalassaemic erythroid cells

Eugenia Prus1, Eitan Fibach

  • 1Department of Haematology, Hadassah Hebrew University Medical Centre, Jerusalem, Israel.

Acta Haematologica
|November 20, 2009
PubMed

Insights

Clinically relevant iron chelators effectively reduce labile iron pool (LIP) and oxidative stress in beta-thalassaemia red blood cells (RBCs) and their precursors. These findings suggest potential therapeutic benefits for improving ineffective erythropoiesis and RBC survival.

Area of Science:

  • Hematology
  • Redox Biology
  • Pharmacology

Background:

  • Beta-thalassaemia is characterized by iron accumulation in organs and red blood cells (RBCs), leading to cellular damage via labile iron pool (LIP) and reactive oxygen species (ROS).
  • Thalassaemic RBCs and erythroid precursors exhibit elevated LIP and ROS compared to normal counterparts.
  • Iron-mediated oxidative stress is a key factor in the pathophysiology of beta-thalassaemia.

Purpose of the Study:

  • To investigate the effects of clinically relevant iron chelators on LIP and oxidative stress parameters in beta-thalassaemia.
  • To compare the efficacy and kinetics of deferiprone, deferasirox, and deferoxamine in reducing LIP and ROS.

Main Methods:

  • Flow cytometry was used to analyze LIP and oxidative stress markers in RBCs, reticulocytes, and cultured erythroid precursors from beta-thalassaemia patients.
  • In vitro treatment with deferiprone, deferasirox, and deferoxamine was performed.

Main Results:

  • All three chelators (deferiprone, deferasirox, deferoxamine) significantly reduced cytosolic LIP in RBCs and reticulocytes.
  • Cytosolic and mitochondrial LIP in cultured erythroid precursors were also reduced by the chelators.
  • Reduced oxidative stress (ROS and external phosphatidylserine exposure) was observed following chelation therapy.
  • Deferiprone and deferasirox demonstrated rapid effects within 10 minutes, while deferoxamine showed a slower onset of action (24 hours).

Conclusions:

  • The studied iron chelators effectively decrease LIP and oxidative stress in thalassaemic RBCs and their precursors.
  • The differential kinetics suggest varying cellular uptake or mechanisms of action among the chelators.
  • Further research is needed to determine if these reductions in LIP and oxidative stress translate to improved ineffective erythropoiesis and RBC survival in beta-thalassaemia.
Abstract

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