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Ultrastructural alterations in caudate nucleus in aged cats
M S Levine1, A M Adinolfi, R S Fisher
1Mental Retardation Research Center, University of California, Los Angeles 90024.
Brain Research
|February 9, 1988
Summary
Aging cats show reduced synapse density in the caudate nucleus, a key brain area for motor control. This age-related change may explain functional declines in older animals.
Area of Science:
- Neuroscience
- Gerontology
- Cell Biology
Background:
- The caudate nucleus plays a crucial role in motor control and cognitive functions.
- Aging is associated with progressive neurological changes that can impact brain function.
- Understanding age-related ultrastructural alterations in the caudate nucleus is vital for comprehending functional decline.
Purpose of the Study:
- To investigate the ultrastructural changes in the caudate nucleus of aged cats.
- To correlate observed morphological changes with potential functional alterations in aging brains.
Main Methods:
- Electron microscopy was used to examine the ultrastructure of the caudate nucleus in aged cats.
- Quantitative analysis of synaptic density and qualitative assessment of neuronal and glial cell morphology were performed.
Main Results:
- A significant decrease in synaptic density was observed in the caudate neuropil of cats older than 3 years.
- An increase in the occurrence of unusually long synapses associated with enlarged spine heads was noted.
- Accumulations of lipofuscin granules and unique configurations of collapsed agranular cisterns were present in aged animals' neurons and glial cells.
Conclusions:
- Reduced synaptic density in the caudate nucleus is a key morphological change associated with aging in cats.
- These ultrastructural alterations, including lipofuscin accumulation, may underlie functional deficits observed in the aging caudate nucleus.
- The findings provide insights into the neurobiological basis of aging in the mammalian brain.