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Polyethylene Glycol Camouflaged Earthworm Hemoglobin.

Vivek P Jani1, Alborz Jelvani1, Selamawit Moges2

  • 1Bioengineering, University of California San Diego, La Jolla, California, United States of America.

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|January 19, 2017
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Summary

This study shows that modifying earthworm hemoglobin (LtEc) with polyethylene glycol (PEG-LtEc) significantly extends its circulation time, making it a more viable red blood cell substitute. However, PEGylation also increased oxidation rates in vivo.

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Area of Science:

  • Biomedical Engineering
  • Biochemistry
  • Hematology

Background:

  • The United States faces a significant deficit in blood donations compared to annual transfusions.
  • Increasing demand for Red Blood Cells (RBCs) due to an aging population exacerbates this shortage.
  • Existing hemoglobin-based oxygen carriers (HBOCs) have not yet achieved clinical approval.

Purpose of the Study:

  • To evaluate the pharmacokinetics and pharmacodynamics of polyethylene glycol-conjugated Lumbricus terrestris erythrocruorin (PEG-LtEc) as a potential RBC substitute.
  • To determine if PEGylation improves the circulation half-life of LtEc.
  • To assess the vascular response and physiological effects of PEG-LtEc infusion.

Main Methods:

  • Pharmacokinetic studies involved 40% exchange transfusions in hamsters with PEG-LtEc or LtEc, monitored for 48 hours.
  • Pharmacodynamic and vascular response studies involved incremental infusions of PEG-LtEc or LtEc to assess systemic and microcirculatory parameters.
  • Animals were instrumented with dorsal window chambers for in vivo monitoring.

Main Results:

  • PEGylation extended the circulation half-life of LtEc to 70 hours, approximately four times longer than unPEGylated LtEc.
  • PEGylation increased the rate of LtEc oxidation in vivo.
  • PEG-LtEc did not induce microvascular vasoconstriction or systemic hypertension.
  • PEG-LtEc maintained colloid osmotic pressure and blood volume expansion capacity comparable to LtEc.

Conclusions:

  • PEGylation effectively increases the circulation time of LtEc, addressing a key limitation for its use as an oxygen carrier.
  • While PEG-LtEc shows a promising safety profile regarding vascular effects, increased oxidation requires further investigation.
  • PEG-LtEc represents a promising candidate for next-generation hemoglobin-based oxygen carriers.