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Hemolysates reduce iron released from transferrin.

H Zhan1, S Pollack, J Weaver

  • 1Department of Medicine, Albert Einstein College of Medicine, Bronx, New York 10461.

American Journal of Hematology
|July 1, 1989
PubMed
Summary
This summary is machine-generated.

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Iron is released from transferrin via a reductive process, not solely by acidification. Hemoglobin and ATP facilitate this reductive release of iron (FeII) in reticulocytes.

Area of Science:

  • Biochemistry
  • Cell Biology
  • Hematology

Background:

  • Transferrin delivers iron to cells, a process involving endocytosis and iron release.
  • Current models suggest endosomal acidification triggers iron release, but this doesn't fully explain the mechanism.
  • Existing evidence points to limitations in the acidification-dependent iron release model.

Purpose of the Study:

  • To elucidate the mechanism of iron release from transferrin in reticulocytes.
  • To investigate alternative pathways for iron removal beyond endosomal acidification.
  • To identify factors and conditions that facilitate efficient iron transfer.

Main Methods:

  • Incubation of transferrin with hemolysates and purified components (hemoglobin, ATP, ADP, DPG, NADH, NADPH).

Related Experiment Videos

  • Analysis of the oxidation state of released iron using biochemical assays.
  • Kinetic analysis of iron release rates under various conditions.

    • Main Results:

    • Iron released from transferrin by hemolysates and hemoglobin/ATP is in the Fe(II) state.
    • ADP and DPG can substitute for ATP, and NADH/NADPH can substitute for hemoglobin in promoting iron release.
    • Reductive iron release is sufficiently rapid to account for iron uptake by reticulocytes.

    Conclusions:

    • Iron release from transferrin is primarily mediated by a reductive mechanism, generating Fe(II).
    • This reductive pathway is more comprehensive than previously thought and occurs efficiently in reticulocytes.
    • Iron reduction to Fe(II) may occur prior to mitochondrial iron delivery.