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Age-related decrease of serotonergic fibres and S-100 beta immunoreactivity in the rat dentate gyrus
A Nishimura1, S Ueda, Y Takeuchi
1Department of Pediatrics, Kyoto Prefectural University of Medicine, Japan.
Neuroreport
|July 10, 1995
Summary
Aging reduces serotonin fibers and S-100 beta astrocytes in the rat dentate gyrus. This decline correlates with reduced S-100 beta, suggesting astrocytes impact serotonergic fiber degeneration.
Area of Science:
- Neuroscience
- Aging Research
- Cell Biology
Background:
- Serotonergic fibers are crucial for cognitive functions.
- Astrocytes play a supportive role in neuronal health.
- Age-related decline in the dentate gyrus impacts memory.
Purpose of the Study:
- To investigate age-related changes in serotonergic fibers and S-100 beta-positive astrocytes in the rat dentate gyrus.
- To explore the relationship between these cellular components during aging.
- To test the hypothesis linking astrocyte-derived factors to serotonergic fiber degeneration.
Main Methods:
- Immunohistochemistry was used to quantify serotonergic fibers and S-100 beta-positive astrocytes.
- Aged rats were compared to younger controls.
- Correlational analysis was performed on the observed changes.
Main Results:
- A significant reduction in both serotonergic fibers and S-100 beta-positive astrocytes was observed in aged rats.
- The decrease in serotonergic fibers positively correlated with the decrease in S-100 beta-positive astrocytes.
- These changes were noted throughout the dentate gyrus.
Conclusions:
- Age-related degeneration of serotonergic fibers in the dentate gyrus is associated with a decrease in S-100 beta-positive astrocytes.
- Reduced levels of S-100 beta in astrocytes may contribute to the decline of serotonergic fibers.
- Astrocytes play a significant role in maintaining serotonergic integrity in the aging brain.