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Hemoglobin autoxidation at physiological concentrations.

A Mansouri1, C A Perry

  • 1Division of Hematology-Oncology, John L. McClellan Memorial Veterans Hospital, Little Rock, Arkansas.

Hemoglobin
|January 1, 1987
PubMed
Summary
This summary is machine-generated.

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High hemoglobin concentration accelerates methemoglobin formation. This increased rate, observed in concentrated solutions and spherocytes, suggests reduced oxygen accessibility contributes to faster hemoglobin autoxidation.

Area of Science:

  • Biochemistry
  • Hematology
  • Cell Biology

Background:

  • Methemoglobin formation is a critical process affecting oxygen transport.
  • Understanding hemoglobin autoxidation rates is vital for diagnosing and treating related disorders.
  • Physiological hemoglobin concentrations may influence reaction kinetics differently than dilute solutions.

Purpose of the Study:

  • To investigate the impact of physiological hemoglobin concentration on the rate of methemoglobin formation.
  • To explore the role of oxygen accessibility in concentrated hemoglobin solutions.
  • To compare autoxidation rates in normal red blood cells versus those with hereditary spherocytosis.

Main Methods:

  • Studying methemoglobin formation kinetics at varying hemoglobin concentrations (2 mM vs. 15-18 mM heme).

Related Experiment Videos

  • Utilizing pure hemoglobin and red cell hemolysate.
  • Conducting experiments under different air pressures and oxygen concentrations.
  • Analyzing red blood cells from a patient with hereditary spherocytosis.

    • Main Results:

    • Hemoglobin autoxidation rate is significantly faster at high physiological concentrations (15-18 mM heme) compared to dilute solutions (2 mM).
    • Constant shaking reduced the observed rate differences between concentrated and dilute samples.
    • No significant differences in autoxidation rates were found under low or normal air pressure, or 100% oxygen.
    • Spherocytes, with higher hemoglobin concentration, exhibited a higher autoxidation rate than normal red blood cells.

    Conclusions:

    • Hemoglobin autoxidation proceeds at a significantly faster rate at physiological red cell concentrations than previously suggested by studies using dilute solutions.
    • Reduced oxygen accessibility in concentrated hemoglobin solutions appears to be a key factor contributing to accelerated autoxidation.
    • These findings have implications for understanding red blood cell pathophysiology and methemoglobinemia.