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Nervonic acid and demyelinating disease

J R Sargent1, K Coupland, R Wilson

  • 1Department of Biological and Molecular Sciences, School of Natural Sciences, University of Stirling, UK.

Medical Hypotheses
|April 1, 1994
PubMed
Summary

Very long chain fatty acids accumulate in adrenoleukodystrophy (ALD) and multiple sclerosis (MS). Dietary monenoic acids may help normalize fatty acid levels and support myelination in these demyelinating diseases.

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Area of Science:

  • Biochemistry
  • Neuroscience
  • Genetics

Background:

  • Adrenoleukodystrophy (ALD) involves demyelination due to impaired peroxisomal beta oxidation, leading to very long chain saturated fatty acid (VLC-SFA) accumulation.
  • Elevated 26:0 levels in ALD correlate with decreased nervonic acid (24:1(n-9)) and increased stearic acid (18:0) in brain sphingolipids.
  • Similar sphingolipid alterations, including reduced 24:1(n-9) and increased 18:0, are observed in post-mortem multiple sclerosis (MS) brain and patient erythrocytes.

Purpose of the Study:

  • To investigate the role of very long chain fatty acids (VLC-FAs) in demyelinating diseases like ALD and MS.
  • To explore the potential therapeutic benefits of long-chain monoenoic acids (LCMAs) in managing these conditions.

Main Methods:

  • Analysis of fatty acid composition in sphingolipids from post-mortem brain tissue and patient-derived cells (fibroblasts, erythrocytes).
  • Comparison of lipid profiles in ALD and MS patients with findings in 'jumpy' and 'quaking' mouse models with impaired myelination.
  • Assessment of the impact of erucic acid (22:1(n-9)) on 26:0 levels in ALD.

Main Results:

  • Erucic acid normalizes elevated 26:0 levels in ALD by inhibiting biosynthesis.
  • ALD and MS brains show decreased nervonic acid and increased stearic acid levels.
  • Defects in VLC-FA biosynthesis, including nervonic acid, are linked to impaired myelination in mouse models.

Conclusions:

  • Demyelinating diseases like ALD and MS are characterized by impaired nervonic acid provision.
  • Dietary supplementation with oils rich in VLC-monenoic acids may offer a beneficial therapeutic strategy for demyelinating conditions.
  • Further research into VLC-FA metabolism is crucial for understanding and treating these neurological disorders.

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