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Immunohistochemical demonstration of glial fibrillary acidic protein in scrapie
Abstract:
Although little is known about its metabolism, glial fibrillary acidic (GFA) protein has become widely used as a cell-specific, species-non-specific antigenic marker for normal or pathologically altered astroglia. So far there have been few investigations on GFA protein in relation to scrapie and analogous spongiform encephalopathies although there has been a need for an unequivocal method for the discrimination of different types of glia in these diseases. In the present studies, a commercially available antiserum to GFA protein incorporated in a peroxidase-antiperoxidase procedure was applied to paraffin sections of brain and spinal cord from mice affected with scrapie, avirulent Semliki forest virus and cuprizone encephalopathy, and to tissues from healthy and scrapie-affected sheep. Excellent delineation of GFA protein was obtained in astroglial cell bodies and processes and in fibrils in the glia limitans and in perivascular and subependymal sites. The method was extremely sensitive and selective. A massive increase in GFA protein in scrapie-affected mice paralleled an increase in reactive astrocytes and facilitated the construction of astroglial lesion profiles for scrapie and the other encephalopathies. In sheep, abundant GFA protein occurred in both healthy and in scrapie-affected animals and in the tissues examined the differences were not conclusive.
Insights
Glial fibrillary acidic (GFA) protein is a marker for astroglia. This study shows GFA protein increases in scrapie-affected mice, aiding in understanding glial responses in neurodegenerative diseases.
Area of Science:
- Neuroscience
- Immunohistochemistry
- Cell Biology
Background:
- Glial fibrillary acidic (GFA) protein is a widely used marker for astroglia.
- Its role in spongiform encephalopathies like scrapie requires further investigation.
- A reliable method to distinguish glial types in these diseases is needed.
Purpose of the Study:
- To investigate the utility of GFA protein as a marker in scrapie and related encephalopathies.
- To evaluate a sensitive and selective immunohistochemical method for GFA protein detection.
- To construct astroglial lesion profiles in affected animal models.
Main Methods:
- Application of a commercially available antiserum to GFA protein using a peroxidase-antiperoxidase procedure.
- Analysis of paraffin-embedded brain and spinal cord sections from mice and sheep.
- Examination of tissues from scrapie, Semliki forest virus infection, and cuprizone encephalopathy models.
Main Results:
- Excellent delineation of GFA protein in astroglial cells and processes was achieved.
- The method demonstrated high sensitivity and selectivity for GFA protein.
- A significant increase in GFA protein was observed in scrapie-affected mice, correlating with reactive astrocytes.
Conclusions:
- The GFA protein detection method is effective for studying astroglial responses in neurodegenerative diseases.
- Increased GFA protein levels in mice with scrapie reflect reactive astrogliosis.
- GFA protein levels in sheep did not show conclusive differences between healthy and scrapie-affected animals.
