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Müller cells in developing rats with inherited retinal dystrophy.
N Kimura1, S Nishikawa, M Tamai
1Department of Ophthalmology, Tohoku University School of Medicine, Sendai, Japan. nobuhiko@hosp.tohoku.ac.jp
The Tohoku Journal of Experimental Medicine
|September 21, 2000
Summary
Müller cells in Royal College of Surgeons (RCS) rats show altered glial fibrillary acidic protein (GFAP) expression during retinal degeneration. Glutamine synthetase (GS) levels remain similar, suggesting Müller cells respond to photoreceptor damage.
Area of Science:
- Neuroscience
- Ophthalmology
- Cell Biology
Background:
- Müller cells are crucial glial cells in the retina, supporting neuronal function.
- Inherited retinal dystrophies, like that in RCS rats, cause progressive photoreceptor cell loss.
- Understanding Müller cell responses is key to addressing retinal degeneration.
Purpose of the Study:
- To investigate the morphology and enzyme expression of Müller cells in developing RCS rats.
- To compare Müller cell responses in normal and dystrophic retinas.
- To elucidate the role of Müller cells in the context of inherited retinal dystrophy.
Main Methods:
- Studied RCS (rdy/rdy) rats and normal RCS (-/+) controls at various postnatal days (P1-P100).
- Utilized intracardiac perfusion and paraformaldehyde fixation for tissue preparation.
- Employed silver enhancing technique for immunohistochemistry of glutamine synthetase (GS) and glial fibrillary acidic protein (GFAP).
- Performed Western blot analysis and ELISA on solubilized retinas to quantify GS and GFAP levels.
Main Results:
- Glutamine synthetase (GS) expression began on P10 and increased in both normal and dystrophic retinas, with similar protein levels detected by Western blot from P21 onwards.
- Glial fibrillary acidic protein (GFAP) was absent in normal retinas but detected in Müller cells of dystrophic retinas from P35 onwards.
- ELISA confirmed increased GS concentrations during development in both groups without significant differences, while GFAP concentrations remained unchanged in normal retinas but significantly increased in dystrophic retinas from P35.
Conclusions:
- Müller cells in dystrophic RCS rat retinas exhibit altered GFAP expression, indicating a reactive gliosis response.
- The similar expression patterns of GS suggest Müller cells maintain some functions despite photoreceptor degeneration.
- These findings highlight Müller cell involvement in the glio-neuronal relationship during progressive retinal degeneration.