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Intravital Microscopy Evidence That Methylene Blue Should Be a Vasopressor-Sparing Agent in Sepsis Vasoplegia

Fabiola Leslie Antunes Cardoso Mestriner1, Pedro Brüch Dantas1, Jéssyca Michelon Barbosa1

  • 1Department of Surgery and Anatomy, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, São Paulo, Brazil.

Brazilian Journal of Cardiovascular Surgery
|April 3, 2024
PubMed

Insights

Methylene blue prevents white blood cells from sticking to blood vessel walls in a rat model of sepsis. This finding is crucial for understanding and treating microcirculation failure during endotoxemia.

Area of Science:

  • Physiology
  • Pharmacology
  • Microcirculation Research

Background:

  • Sepsis often leads to microvasculature failure, impacting blood flow and organ function.
  • Elevated amine concentrations exacerbate microcirculatory dysfunction.
  • Targeting leukocyte-endothelial interactions is a potential therapeutic strategy.

Purpose of the Study:

  • To investigate the potential of methylene blue in preventing leukocyte adhesion to the endothelium.
  • To evaluate the efficacy of methylene blue in a rat model of endotoxemia.

Main Methods:

  • Utilized a rat model of lipopolysaccharide-induced endotoxemia.
  • Employed intravital microscopy to visualize and quantify leukocyte-endothelial interactions.
  • Administered methylene blue to assess its preventative effects.

Main Results:

  • Methylene blue significantly inhibited the adherence of leukocytes to the endothelium.
  • Demonstrated a protective effect on microcirculation in the endotoxemia model.

Conclusions:

  • Methylene blue shows promise as a therapeutic agent to mitigate microcirculatory impairment in sepsis.
  • Preventing leukocyte adhesion may be a key mechanism by which methylene blue exerts its protective effects.
Keywords:
EndotheliumLipopolysaccharidesMethylene BlueMicrocirculationMicrovessels

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