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Related Experiment Videos

Heme-containing proteins suppress lymphatic pumping.

G Wandolo1, R M Elias, N S Ranadive

  • 1Trauma Research Program, Sunnybrook Health Science Centre, Toronto, Canada.

Journal of Vascular Research
|May 1, 1992
PubMed
Summary

Oxyhemoglobin in erythrolysate significantly reduces lymphatic pumping by approximately 70%. This suggests the heme component, not the protein, is crucial for modulating lymphatic function after injury or inflammation.

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Area of Science:

  • Physiology
  • Biochemistry

Background:

  • Red blood cells (RBCs) and their lysate products are present in lymph during inflammation, trauma, and surgery.
  • Previous research indicated erythrolysate alters lymphatic pumping pressures.

Purpose of the Study:

  • To test the hypothesis that oxyhemoglobin is the active component in erythrolysate responsible for modulating lymphatic pumping.

Main Methods:

  • Bovine lymphatic vessels were studied in an organ bath setup to measure pumping activity under applied transmural pressure.
  • Erythrolysate was prepared and purified; oxyhemoglobin and its derivative methemoglobin were tested.
  • Oxymyoglobin was used to differentiate the role of heme versus protein.

Main Results:

  • Both crude erythrolysate and purified oxyhemoglobin (10(-5) M) inhibited lymphatic pumping by ~70% over 2 hours.

Related Experiment Videos

  • Methemoglobin, an oxidized form, showed no inhibitory activity, indicating the heme group's importance.
  • Oxymyoglobin, containing the same heme but different protein, also inhibited lymphatic pumping.

    • Conclusions:

    • Oxyhemoglobin is identified as a key active material within erythrolysate that reduces lymphatic pumping.
    • The heme portion of the molecule appears critical for this observed lymphatic inhibition.
    • Findings suggest a mechanism by which RBC breakdown products can affect lymphatic transport in physiological conditions.