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n-3 PUFA induce microvascular protective changes during ischemia/reperfusion.

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  • 1Laboratório de Pesquisas Clínicas e Experimentais em Biologia Vascular, Centro Biomédico, Universidade do Estado do Rio de Janeiro, Rua São Francisco Xavier, 524, Pavilhão Reitor Haroldo Lisboa da Cunha térreo, Rio de Janeiro, RJ, 20550-013, Brazil, mgcsouza@gmail.com.

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Summary

Fish oil, rich in n-3 polyunsaturated fatty acids (PUFA), effectively combats ischemia/reperfusion (I/R) injury. Triacylglycerol forms of EPA and DHA show promise in preventing microvascular damage and reducing leukocyte activity during I/R events.

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Area of Science:

  • Cardiovascular Science
  • Nutritional Science
  • Inflammation Research

Background:

  • Ischemia/reperfusion (I/R) injury is a critical factor in myocardial infarction, stroke, and organ failure.
  • I/R injury involves endothelial dysfunction, increased vascular permeability, and leukocyte-endothelial interactions.
  • n-3 polyunsaturated fatty acids (PUFA), like EPA and DHA in fish oil, possess anti-inflammatory properties.

Purpose of the Study:

  • To investigate the protective effects of fish oil, EPA, and DHA against microvascular I/R injury.
  • To compare the efficacy of triacylglycerol (TAG) and ethyl ester (EE) forms of EPA and DHA.

Main Methods:

  • Hamsters were orally treated with saline, olive oil, fish oil, or EPA/DHA (TAG or EE forms) for 14 days.
  • The hamster cheek pouch preparation was used to induce and study I/R injury.
  • Arteriolar diameter, leukocyte rolling and adhesion, and macromolecular permeability were measured.

Main Results:

  • Fish oil treatment restored arteriolar diameter post-ischemia.
  • Fish oil and DHA TAG significantly reduced rolling leukocytes.
  • Fish oil, EPA TAG, and DHA TAG significantly inhibited leukocyte adhesion.
  • EPA TAG, DHA TAG, EPA EE, and fish oil mitigated the rise in macromolecular permeability, with DHA EE showing less efficacy.

Conclusions:

  • Consumption of n-3 PUFA, particularly in the triacylglycerol form, shows potential for preventing I/R-induced microvascular damage.
  • EPA and DHA in TAG form are effective in mitigating key pathological aspects of I/R injury.
  • These findings suggest a promising therapeutic strategy for managing I/R injury and its sequelae.