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A decrease in cell size accompanies a loss of docosahexaenoate in the rat hippocampus.

Aneeq Ahmad1, Mahadev Murthy, Rebecca S Greiner

  • 1Section of Nutritional Neuroscience, Laboratory of Membrane Biochemistry and Biophysics, Division of Intramural Clinical and Biological Research, National Institutes on Alcohol Abuse and Alcoholism, National Institutes of Health, Rockville, MD, USA.

Nutritional Neuroscience
|May 15, 2002
PubMed
Summary
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Rats fed diets lacking omega-3 fatty acids showed smaller hippocampal neurons, impacting spatial memory. Supplementing with docosahexaenoic acid (DHA) normalized neuron size, suggesting its crucial role in brain structure.

Area of Science:

  • Neuroscience
  • Nutritional Science
  • Cell Biology

Background:

  • Essential fatty acids, particularly omega-3s, are vital for brain function.
  • Docosahexaenoic acid (DHA) is a key structural component of neuronal membranes in the hippocampus.
  • Dietary deficiencies in n-3 fatty acids are linked to cognitive impairments, including spatial memory deficits.

Purpose of the Study:

  • To investigate the neuroanatomical changes in the hippocampus associated with n-3 essential fatty acid deficiency.
  • To determine the specific effects of linoleic acid (LA) and alpha-linolenic acid (LNA) with or without DHA on hippocampal morphology.
  • To correlate observed morphological changes with established spatial memory deficits.

Main Methods:

  • Rats were raised for three generations on diets varying in n-3 fatty acid content (n-3 deficient, n-3 supplemented).

Related Experiment Videos

  • Hippocampal fatty acid composition was analyzed, focusing on DHA and docosapentaenoic acid (DPAn-6).
  • Unbiased stereology was used to measure neuronal volume, density, number, and cell body size in specific hippocampal subregions (CA1-3, granular, hilar layers).

    • Main Results:

    • A significant reduction (90%) in hippocampal DHA was observed in rats fed n-3 deficient diets (LA, high LA) compared to supplemented groups (+LNA, +LNA/DHA).
    • A reciprocal increase in DPAn-6 was found in all phospholipid species in deficient groups.
    • No differences in neuronal volume, density, or total number were detected; however, CA1 pyramidal neuron cell body size was significantly smaller in the LA group compared to the +LNA/DHA group.

    Conclusions:

    • Dietary n-3 fatty acid deficiency, specifically DHA, leads to a reduction in CA1 pyramidal neuron cell body size in the hippocampus.
    • These morphological changes may underlie the spatial memory deficits observed in n-3 deficient rats.
    • Adequate DHA supplementation is crucial for maintaining hippocampal neuronal morphology and potentially cognitive function.