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Monoamine oxidase inhibition improves vascular function and reduces oxidative stress in rats with

Corina Rațiu1, Diana Uțu, Alexandra Petruș

  • 1Department of Pathophysiology - Functional Sciences, Faculty of Medicine, "Victor Babeș" University of Medicine and Pharmacy, Timișoara, Romania. sturza.adrian@umft.ro.

General Physiology and Biophysics
|August 1, 2018
PubMed

Insights

Monoamine oxidases (MAOs) contribute to inflammation-induced endothelial dysfunction. Inhibiting MAO-A and MAO-B in rats improved vascular function and reduced oxidative stress, suggesting a therapeutic target for cardiometabolic diseases.

Area of Science:

  • Biochemistry
  • Cardiovascular Biology
  • Pharmacology

Background:

  • Oxidative stress and vascular inflammation are key drivers of cardiovascular and metabolic diseases.
  • Monoamine oxidases (MAOs), mitochondrial enzymes with A and B isoforms, have been implicated in inflammation-related endothelial dysfunction.

Purpose of the Study:

  • To investigate the role of MAO-A and MAO-B in endothelial dysfunction during acute inflammation in rats.
  • To assess the therapeutic potential of MAO inhibition in a lipopolysaccharide (LPS)-induced inflammation model.

Main Methods:

  • Organ-bath studies of aortic vascular reactivity in rats treated with LPS.
  • Measurement of hydrogen peroxide (H2O2) production.
  • Assessment using MAO inhibitors (reversible and irreversible).

Main Results:

  • LPS administration induced MAO-A and MAO-B expression in the rat vasculature.
  • Inhibition of both MAO isoforms significantly improved vascular function.
  • MAO inhibition led to a reduction in oxidative stress.

Conclusions:

  • MAO-A and MAO-B contribute to endothelial dysfunction in LPS-induced acute inflammation in rats.
  • MAO inhibition presents a potential therapeutic strategy for treating cardiometabolic diseases associated with inflammation.

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