Summary
This study in marmosets found region-dependent volumetric and neurochemical changes in subcortical visual structures during aging, including DLG volume increase and decreased GFAP expression suggesting astrocytic atrophy. These findings have implications for understanding why older adults experience progressive visual deficits, which is relevant for designing lighting environments that compensate for age-related declines in visual processing.
Key Findings
- Total and layer-specific volumetric increase observed in the Dorsal Lateral Geniculate Nucleus (DLG) with aging in marmosets (adult: 36–50 months vs. aged: 119–140 months)
- Superior Colliculus superficial layers showed overall stability in volume and neuronal number with aging, suggesting lower vulnerability to age-related changes compared to DLG
- Age-related decrease in GFAP immunoexpression found in both DLG and ventral Superior Colliculus (SCv), interpreted as indicative of astrocytic atrophy rather than neuronal loss
- Neuronal number remained relatively stable across structures, suggesting volumetric changes reflect non-neuronal (glial/structural) remodeling rather than neuronal death
Categories
Eye Health & Vision: Examines age-related morphological and neurochemical changes in subcortical visual processing structures (DLG and Superior Colliculus) relevant to declining visual function with aging.
Dementia & Elder Care: Investigates structural brain changes during aging in a primate model, with implications for understanding visual system vulnerability in elderly populations.
Author(s)
NNM Santana
Publication Year
2023
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