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Phospholipid composition and levels are altered in Down syndrome brain
E J Murphy1, M B Schapiro, S I Rapoport
1Section on Brain Physiology and Metabolism, National Institute on Aging, National Institutes of Health, Building 10, Room 6C103, Bethesda, MD 20892, USA.
Brain Research
|June 6, 2000
Summary
Older individuals with Down syndrome (DS) exhibit significantly reduced brain phospholipid levels, particularly phosphatidylinositol and ethanolamine plasmalogen, suggesting altered lipid metabolism or neuronal loss. These changes are linked to Down syndrome itself, not Alzheimer's pathology.
Area of Science:
- Neuroscience
- Biochemistry
- Genetics
Background:
- Down syndrome (DS) is associated with neurological alterations.
- Understanding brain lipid metabolism is crucial for DS research.
Purpose of the Study:
- To investigate phospholipid composition and levels in the brains of older individuals with Down syndrome.
- To determine if observed changes are related to Down syndrome or co-occurring neuropathology.
Main Methods:
- Postmortem frontal cortical and cerebellar gray matter from DS patients and controls were analyzed.
- Phospholipid composition (mol %) and levels (nmol/mg protein) were quantified.
- Cholesterol/phospholipid ratios were calculated.
Main Results:
- Total phospholipid content was reduced by approximately 20% in DS brain regions.
- Significant decreases were observed in phosphatidylinositol (37%) and ethanolamine plasmalogen (35%).
- Cholesterol/phospholipid ratios remained constant, indicating compensatory changes.
Conclusions:
- Reduced phospholipid content in DS brains may result from dendritic loss or impaired lipid metabolism.
- Specific phospholipids like phosphatidylinositol and ethanolamine plasmalogen are disproportionately affected.
- Findings suggest a general defect in brain lipid metabolism in older DS subjects, independent of Alzheimer's pathology.