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Published on: October 30, 2018
Neuronal changes in normal human aging and Alzheimer's disease
Harry B M Uylings1, J M de Brabander
1Netherlands Institute for Brain Research, Royal Netherlands Academy of Arts and Sciences, Amsterdam, The Netherlands. h.uylings@nih.knaw.nl
Age-related brain changes, including neuron and synapse density, are less severe than previously thought. Reductions are region-specific, differing from Alzheimer's disease patterns.
Area of Science:
- Neuroscience
- Aging Research
- Neuropathology
Background:
- Brain structure undergoes significant alterations with aging.
- Previous research suggested widespread neuronal loss in aging brains.
- Understanding these changes is crucial for differentiating normal aging from neurodegenerative diseases.
Purpose of the Study:
- To review age-related changes in brain weight, neuronal number, and synaptic density.
- To compare aging-related brain alterations with those observed in Alzheimer's disease.
- To provide an updated perspective on the extent and localization of age-related brain modifications.
Main Methods:
- Literature review of studies on brain aging.
- Comparative analysis of morphological changes in aging versus Alzheimer's disease brains.
- Examination of data on brain weight, neuronal counts, and synapse density across different brain regions and cortical layers.
Main Results:
- Age-related reductions in brain components are not uniform but specific to certain brain regions and cortical layers.
- The overall outlook on age-related brain changes is more optimistic than previously considered.
- Alzheimer's disease exhibits a distinct pattern of brain changes compared to normal aging.
Conclusions:
- Association cortices are particularly vulnerable to changes in both aging and Alzheimer's disease.
- Primary visual and somatosensory cortices show relative resilience to age-related alterations.
- Current understanding suggests a more nuanced view of brain aging, highlighting regional specificity.
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