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Developmental changes in astrocyte density in the macaque perifoveal region
C Distler1, K Kopatz, I Telkes
1Allgemeine Zoologie und Neurobiologie, Ruhr-Universität Bochum, Postfach 102148, D-44780 Bochum, Germany. distler@neurobiologie.ruhr-uni-bochum.de
The European Journal of Neuroscience
|April 13, 2000
Summary
Retinal astrocyte density decreases during development, with fewer astrocytes in the perifoveal region than expected. This reduction is not due to selective cell death, suggesting alternative explanations for astrocyte distribution in the developing retina.
Area of Science:
- Neuroscience
- Developmental Biology
- Ophthalmology
Background:
- Adult macaques exhibit an astrocyte-free foveal region, contrasting with astrocyte presence at birth.
- Early development involves significant changes in astrocyte populations within the central retina.
Purpose of the Study:
- To investigate astrocyte density in perifoveal and extrafoveal regions during retinal development.
- To determine if perifoveal astrocyte invasion matches other central retinal areas.
- To elucidate the mechanisms behind perifoveal astrocyte density reduction.
Main Methods:
- Studied astrocyte density from embryonic day 112 to 2 months post-birth.
- Compared perifoveal regions with extrafoveal regions equidistant from the optic disc (OD).
- Utilized glial fibrillary acidic protein (GFAP) immunocytochemistry and TUNEL assay to assess astrocyte survival and apoptosis.
Main Results:
- Perifoveal regions consistently showed lower astrocyte density than equidistant extrafoveal regions from the earliest studied stage.
- Astrocyte numbers declined steadily in both regions until birth, with a sharp decrease in the perifovea postnatally.
- Apoptosis rates, assessed by TUNEL staining, did not significantly differ between perifoveal and extrafoveal areas, nor were there peaks in cell death.
Conclusions:
- The reduction in perifoveal astrocyte density is not explained by insufficient astrocyte invasion or elevated apoptosis.
- The findings challenge existing hypotheses regarding astrocyte population dynamics in the developing fovea.
- Further research is needed to explore alternative mechanisms influencing perifoveal astrocyte reduction.