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- W2080782641 abstract "On-grid (post-embedding) immunolabeling methods with epoxy resins have been difficult to apply to thin structures such as intermediate filaments, which may remain inaccessible within the plastic. In this study, glial fibrillary acidic protein (GFAP), the major protein of astrocyte intermediate filaments, was localized with a post-embedding immunogold method, using both unosmicated and osmicated material embedded in epoxy resin. The tissue studied was from a diagnostic brain biopsy on a child with Alexander's disease. This disorder is characterized by proliferation of astrocyte intermediate filaments and formation of Rosenthal fibers. With unosmicated tissue, as in a previous study, extensive labeling of the glial filaments was achieved only when ultra-thin sections were pre-treated with dilute sodium ethoxide, an agent that dissolves plastic. Fifteen-nm gold could be used. With osmicated tissue, localization to glial filaments required pre-treatment with sodium ethoxide and with the oxidizing agent sodium metaperiodate, followed by the use of small (5 nm) colloidal gold. That 5-nm gold was required for labeling filaments in osmicated material suggested that osmication increases problems of penetrability and antigen accessibility within ultra-thin sections. The large Rosenthal fibers were labeled by 15-nm gold in both unosmicated and osmicated material. The methods employed may be useful for electron immunolocalizations to other thin structures in material embedded in epoxy resin." @default.
- W2080782641 created "2016-06-24" @default.
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- W2080782641 date "1990-01-01" @default.
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- W2080782641 title "Ultrastructural immunogold labeling of glial filaments in osmicated and unosmicated epoxy-embedded tissue." @default.
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- W2080782641 doi "https://doi.org/10.1177/38.1.2152935" @default.
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