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Polyunsaturated fatty acids, inflammation, and immunity.

P C Calder1

  • 1Institute of Human Nutrition, University of Southampton, Southampton 5016 7PX, United Kingdom. pcc@soton.ac.uk

Lipids
|November 29, 2001
PubMed
Summary

Dietary fish oil, rich in n-3 polyunsaturated fatty acids (PUFA), can modulate immune responses. Supplementation reduces inflammatory mediators and may benefit inflammatory and autoimmune conditions.

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Area of Science:

  • Immunology
  • Nutrition Science
  • Biochemistry

Background:

  • Dietary fatty acids significantly influence immune cell composition and function.
  • Polyunsaturated fatty acids (PUFA) play a crucial role in mediating inflammation and immunity.
  • Arachidonic acid (AA, an n-6 PUFA) and eicosapentaenoic acid (EPA, an n-3 PUFA from fish oil) are key players in inflammatory pathways.

Purpose of the Study:

  • To investigate the impact of dietary fish oil, specifically its n-3 PUFA content, on inflammatory and immune cell functions.
  • To explore the mechanisms by which dietary EPA influences the production of inflammatory mediators.
  • To assess the potential therapeutic benefits of fish oil supplementation in inflammatory and autoimmune diseases.

Main Methods:

  • Analysis of fatty acid composition in inflammatory and immune cells following dietary interventions.
  • Measurement of inflammatory mediator production (e.g., prostaglandins, leukotrienes, cytokines) from cells exposed to different fatty acids.
  • Evaluation of immune cell functions such as chemotaxis and lymphocyte activity.
  • Review of animal studies and clinical trials investigating fish oil supplementation effects.

Main Results:

  • Fish oil supplementation leads to the incorporation of EPA into cell membranes, partially replacing AA.
  • This replacement results in reduced production of pro-inflammatory mediators derived from AA.
  • EPA-derived mediators exhibit different biological activities compared to AA-derived ones.
  • Studies show suppressed pro-inflammatory cytokine production by macrophages and altered lymphocyte function in animals fed fish oil.
  • Human studies demonstrate decreased monocyte and neutrophil chemotaxis and reduced pro-inflammatory cytokine production with fish oil supplementation.
  • Fish oil feeding ameliorates symptoms in animal models of autoimmune disease and shows clinical benefits in rheumatoid arthritis, inflammatory bowel disease, and asthma.

Conclusions:

  • Dietary n-3 PUFA, particularly EPA from fish oil, possess significant anti-inflammatory and immunomodulatory properties.
  • Fish oil supplementation can effectively alter immune cell fatty acid profiles and reduce inflammatory mediator synthesis.
  • These effects support the therapeutic potential of fish oil in managing inflammatory and autoimmune conditions.

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