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Updated: May 28, 2026
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In Vivo Dynamics of Retinal Microglial Activation During Neurodegeneration: Confocal Ophthalmoscopic Imaging and Cell Morphometry in Mouse Glaucoma
Published on: May 11, 2015
Altered glial gene expression, density, and architecture in the visual cortex upon retinal degeneration
Ashley Cornett1, Joseph F Sucic, Dylan Hillsburg
1Biology Department, University of Michigan-Flint, Flint, MI 48502, USA.
Brain Research
|October 11, 2011
Summary
Progressive retinal degeneration in mice causes blindness and alters glial fibrillary acidic protein (GFAP) and vimentin gene expression in the visual cortex, impacting astrocyte structure and function.
Area of Science:
- Neuroscience
- Cell Biology
- Ophthalmology
Background:
- Intermediate filaments (IFs) are crucial for neural connections, but their regulation in neurological diseases is unclear.
- Glial fibrillary acidic protein (GFAP) and vimentin are key Type III IF proteins expressed in astrocytes.
Purpose of the Study:
- To investigate the impact of progressive retinal degeneration on IF gene expression and astrocyte morphology in the mouse visual cortex.
- To determine the onset of visual deficits in a Pde6b(-) mouse model.
Main Methods:
- Behavioral testing to assess visual deficits from postnatal day 21.
- Quantitative PCR (Q-PCR) to measure GFAP and vimentin mRNA expression.
- Immunohistochemistry to analyze astrocyte density, morphology, and protein expression.
Main Results:
- Pde6b(-) mice exhibited blindness by postnatal day 49, with visual deficits detected at postnatal day 35.
- Reduced GFAP mRNA expression was observed in the visual cortex between postnatal days 28 and 49.
- An increased vimentin:GFAP astrocyte ratio and reduced GFAP cell body area were noted at postnatal day 49.
Conclusions:
- Retinal degeneration induces significant cellular and molecular changes in astrocytes within the visual system.
- These glial plasticity alterations occur in response to reduced visual input, though functional consequences are yet to be determined.
