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Visual deprivation effects on the s100beta positive astrocytic population in the developing rat visual cortex: a
Enrike G Argandoña1, Marco L Rossi, Jose V Lafuente
1Department of Nursing I, School of Nursing, Euskal Herriko Unibertsitatea/University of the Basque Country, Leioako Campusa, Leioa E-48940, Spain. nfpguare@lg.ehu.es
Brain Research. Developmental Brain Research
|March 20, 2003
Summary
Visual deprivation after birth significantly reduces astrocyte density in the rat visual cortex after the critical period. This suggests that visual experience is crucial for maintaining astroglial populations in the developing brain.
Area of Science:
- Neuroscience
- Developmental Biology
- Cell Biology
Background:
- Visual input after birth is critical for modulating cortical development, particularly during the critical period.
- Astrocytes are vital for cortical development, maintenance, plasticity, and vascular network function.
Purpose of the Study:
- To investigate quantitative differences in astrocyte populations within the rat striate cortex.
- To determine the impact of visual experience, specifically dark rearing, on astrocyte density during postnatal development.
Main Methods:
- Studied Sprague-Dawley rats (light-exposed and dark-reared) at multiple postnatal ages (14-63 days).
- Quantified astrocyte populations using immunohistochemistry for S-100beta protein in the visual cortex and retrosplenial cortex.
- Compared S-100beta positive cell counts between light-exposed and dark-reared groups.
Main Results:
- Astrocyte morphology reached adult levels by 14 days postnatal in the visual cortex.
- No significant difference in astrocyte numbers between groups up to 35 days postnatal; higher in dark-reared at 21 days.
- Significantly lower astroglial density observed in the visual cortex of dark-reared rats after 35 days postnatal.
Conclusions:
- Lack of visual experience leads to a significant downregulation of the astrocytic population in the visual cortex after the critical developmental period.
- The observed changes are specific to the visual cortex, as no differences were found in the nonsensory retrosplenial cortex.
- Visual experience is essential for the maintenance of normal astrocyte density in the developing visual cortex.