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Artificial red blood cells increase large vessel wall damage and decrease surrounding dermal tissue damage in a

Kae Shimanouchi1, Naoaki Rikihisa2, Yoshiaki Saito3

  • 1Department of Plastic, Reconstructive, and Aesthetic Surgery, Chiba University Hospital, Chiba, Japan.

The Journal of Dermatology
|February 25, 2021
PubMed
Summary

Artificial red blood cells, or hemoglobin vesicles (Hb-Vs), enhance pulsed-dye laser treatment for port-wine stains. Hb-Vs improve vessel selectivity, increasing damage to targeted blood vessels while protecting surrounding skin.

Keywords:
Monte Carlo methodblood substitutesphotosensitizing agentsport-wine stainselective photothermolysis

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Area of Science:

  • Biomedical Engineering
  • Dermatology
  • Photomedicine

Background:

  • Artificial red blood cells, specifically hemoglobin (Hb) vesicles (Hb-Vs), show promise as photosensitizers in laser treatments.
  • Previous studies demonstrated Hb-Vs' effectiveness in treating small blood vessels in animal models.

Purpose of the Study:

  • To analyze the photosensitizing effect of Hb-Vs on larger blood vessels and surrounding tissues during pulsed-dye laser (PDL) irradiation.
  • To evaluate the impact of Hb-Vs on the selectivity and safety of PDL therapy for vascular lesions.

Main Methods:

  • Histopathological analysis of rabbit auricle models after PDL irradiation with and without intravenous Hb-V injection.
  • Monte Carlo light-scattering simulations to assess laser light absorption and reflection changes.
  • Grading of tissue damage markers on a five-point scale and statistical comparison.

Main Results:

  • Hb-Vs significantly increased damage markers in large blood vessels (1-3 mm diameter) compared to controls.
  • Hb-V injection significantly reduced PDL-induced necrosis and hemorrhage in surrounding dermal tissues.
  • Computer simulations indicated increased photon absorption within vessels and decreased absorption in surrounding tissues with Hb-Vs.

Conclusions:

  • Intravenous Hb-Vs enhance PDL treatment selectivity, increasing damage to target vessel walls while minimizing collateral damage to surrounding skin.
  • Hb-V administration prior to PDL therapy can improve treatment outcomes and safety profiles for port-wine stain treatment.