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Human prefrontal cortex phospholipids containing docosahexaenoic acid increase during normal adult aging, whereas

Sarah E Norris1, Michael G Friedrich2, Todd W Mitchell1

  • 1Illawarra Health and Medical Research Institute, University of Wollongong, Wollongong, New South Wales, Australia; School of Medicine, University of Wollongong, Wollongong, New South Wales, Australia.

Neurobiology of Aging
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Brain membrane phospholipids change with age. Phosphatidylserine increases, while phosphatidylethanolamine decreases, indicating significant lipid alterations during adult aging.

Keywords:
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Area of Science:

  • Neuroscience
  • Biochemistry
  • Gerontology

Background:

  • Membrane phospholipids are crucial for brain function.
  • Alterations in phospholipid composition are implicated in neurodegenerative diseases.
  • Limited knowledge exists regarding phospholipid changes during normal adult aging.

Purpose of the Study:

  • To investigate age-related changes in phospholipid composition.
  • Focus on mitochondrial and microsomal membranes in the human dorsolateral prefrontal cortex.
  • Examine changes across the adult lifespan.

Main Methods:

  • Analysis of phospholipid composition in human brain tissue samples.
  • Comparison of membrane fractions (mitochondrial and microsomal) across different age groups.
  • Quantification of specific phospholipid species, including those with docosahexaenoic, arachidonic, and adrenic acids.

Main Results:

  • Significant age-related increase in phosphatidylserine (18:0_22:6) in both mitochondrial and microsomal membranes (approx. 33%).
  • A 25% decrease in mitochondrial phosphatidylethanolamine (18:0_20:4) with age.
  • General trend of increased phospholipids with docosahexaenoic acid and decreased phospholipids with arachidonic or adrenic acid over the lifespan.

Conclusions:

  • Adult aging is associated with gradual, significant changes in brain membrane lipid composition.
  • These findings provide insights into the lipid dynamics of aging brains.
  • Understanding these changes may inform future research on age-related neurological conditions.