Summary
The vitreous body contains complex carbohydrates that can be demonstrated morphologically. Vitreous hyaluronic acid is very soluble but it can be precipitated by cetylpyridinium chloride (CPC) while being cross-linked by glutaraldehyde. Oligosaccharide chains of vitreous glycoproteins are fixed with glutaraldehyde alone. Mouse eyes were fixed with glutaraldehyde or glutaraldehyde and CPC and the complex carbohydrates of the posterior vitreous cortex were studied by electron microscopy. Cationic dyes were used in the fixative or for block-staining on most fixed tissue blocks to allow detailed observations of complex carbohydrates. Most blocks were postfixed with OsO4. The hyaluronic-acid domain on vitreous collagen fibrils sequentially contracted and expanded in size with various histochemical manipulations. Contraction of the domain of hyaluronic acid generally indicates an increased charge density. OsO4 contributes considerable charge density upon forming osmate esters, but tissue postfixed with OsO4 contained large globular forms of hyaluronic acid rather than the small globules observed in non-osmicated preparations. A model is proposed to explain the seemingly paradoxical findings by reference to suggested mechanisms of polysasaccharideligand-OsO4 interactions.
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Supported in part by American Cancer Society Institutional Research Grant IN-85-M-15, University of Tennessees and NIH Grants EY-03828 and EY-04705
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Rhodes, R.H. An ultrastructural study of histochemical staining of complex carbohydrates in the mouse posterior vitreous body. Histochemistry 78, 125–143 (1983). https://doi.org/10.1007/BF00491119
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DOI: https://doi.org/10.1007/BF00491119