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Membrane lipids in the aging human brain
L Svennerholm1, K Boström, C G Helander
1Department of Psychiatry and Neurochemistry, Göteborg University, St. Jörgen Hospital, Hisings Backa, Sweden.
Journal of Neurochemistry
|June 1, 1991
Summary
Human brain membrane lipids decrease with age, particularly after 90, indicating neuronal membrane and myelin loss. Brain hydration also varies significantly among individuals.
Area of Science:
- Neuroscience
- Biochemistry
- Gerontology
Background:
- Human brain aging involves changes in cellular composition.
- Membrane lipid composition is crucial for neuronal function and brain health.
Purpose of the Study:
- To investigate age-related changes in human brain membrane lipid composition.
- To explore variations in brain hydration and their correlation with lipid content.
Main Methods:
- Analysis of brain tissue from 39 individuals (21 men, 18 women) aged 60-97.
- Inclusion of subjects with sudden, unexpected death and no history of neurological disease.
- Macroscopic and microscopic examinations to rule out organic brain disorders.
Main Results:
- A continuous decrease in the percentage of solids was observed with age, alongside significant individual variations in brain hydration.
- Membrane lipid content declined steadily until age 90.
- A marked reduction in gangliosides and cerebrosides occurred after age 90, suggesting rapid loss of neuronal membranes and myelin.
Conclusions:
- Age-related decline in brain membrane lipids, especially after 90, impacts neuronal integrity and myelin sheath.
- Significant variations in brain hydration exist among older adults.
- Clinical implications of these age-associated changes in brain composition warrant further investigation.