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Formula alpha-linolenic (18:3(n - 3)) and linoleic (18:2(n - 6)) acid influence neonatal piglet liver and brain

L D Arbuckle1, F M Rioux, M J MacKinnon

  • 1Department of Human Nutrition, University of British Columbia, Vancouver, Canada.

Biochimica Et Biophysica Acta
|May 8, 1992
PubMed
Summary
This summary is machine-generated.

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Dietary alpha-linolenic acid (18:3(n-3)) influences saturated fatty acids in newborn piglets. Higher 18:3(n-3) intake reduced palmitic acid and increased docosahexaenoic acid in tissues.

Area of Science:

  • Nutritional Science
  • Biochemistry
  • Developmental Biology

Background:

  • Saturated fatty acids are crucial for membrane properties and can be synthesized de novo.
  • The impact of dietary essential fatty acids on saturated fatty acid content in newborn membrane phospholipids remains understudied.
  • Essential fatty acids like linoleic acid (18:2(n-6)) and alpha-linolenic acid (18:3(n-3)) are vital for infant nutrition.

Purpose of the Study:

  • To investigate the effect of varying dietary levels of alpha-linolenic acid (18:3(n-3)) and linoleic acid (18:2(n-6)) on saturated and unsaturated fatty acid composition in newborn piglets.
  • To explore the potential influence of dietary 18:3(n-3) on the de novo synthesis of palmitic acid (16:0).
  • To determine the impact of essential fatty acid ratios on tissue accretion of omega-3 fatty acids, specifically docosahexaenoic acid (22:6(n-3)).

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Main Methods:

  • Piglets were fed formula with controlled levels of 18:3(n-3) (1% or 4%) and 18:2(n-6) (16% or 30-35%) from birth for 15 days.
  • Analysis of saturated and unsaturated fatty acid composition in liver and brain structural lipids was performed.
  • Statistical analysis was used to identify significant relationships between dietary fatty acids and tissue fatty acid profiles.

Main Results:

  • A significant inverse relationship was observed between dietary 18:3(n-3) percentage and liver phospholipid palmitic acid (16:0), suggesting a potential effect on de novo synthesis.
  • Monounsaturated fatty acids were significantly lower in both liver and brain when piglets received high 18:3(n-3) or high 18:2(n-6) with low 18:1(n-9).
  • Higher dietary 18:3(n-3) (4% vs 1%) resulted in significantly increased docosahexaenoic acid (22:6(n-3)) in liver phospholipid and brain total lipid.

Conclusions:

  • Dietary alpha-linolenic acid (18:3(n-3)) may influence the de novo synthesis of saturated fatty acids like palmitic acid (16:0) in newborns.
  • The level of 18:3(n-3) in infant formula is critical for achieving adequate tissue accretion of omega-3 fatty acids, including docosahexaenoic acid (22:6(n-3)).
  • Future research on essential fatty acid requirements should consider the interplay with saturated fatty acids in structural lipids for optimal infant nutrition.