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- W2171411565 abstract "Aqueous tissue processing and demineralization procedures may adversely affect the inorganic mineral phase of a calcified sample and, where mineral and organic constituents interact, may consequently also indirectly alter organic matrix ultrastructure and distribution. In the present work, the effects of demineralization have been investigated on the retention in chicken bone of two phosphoamino acids, O-phosphoserine and O-phosphothreonine, found in bone phosphoproteins proposed to be important in vertebrate mineralization and, more specifically, on the retention and distribution of a 66 kD bone phosphoprotein (66 kD BPP, osteopontin) also implicated in the calcification process. In tibiae fixed initially with 1% glutaraldehyde and then demineralized in 0.5 N HCl, 0.5 N acetic acid, or 0.1 M EDTA (all containing 1% glutaraldehyde), amino acid analyses and quantitative immunocytochemistry revealed that the phosphoamino acid content and the distribution of the 66 kD BPP were essentially the same as in fixed undemineralized controls. However, demineralization slightly altered the ultrastructural appearance of immunolabeled, electron-dense patches of organic material in the bone matrix. In unfixed bone demineralized with any of these acids, there was a substantial loss of phosphoamino acids and the 66 kD BPP from the bone matrix. The relative ability of these acids to extract phosphoproteins from unfixed bone was found to decrease in the order EDTA greater than HCl greater than acetic acid. These results emphasize the differential effects on structural components of various demineralization and extraction procedures for biochemical and immunocytochemical studies of biologic tissues. Furthermore, they demonstrate that initial fixation with glutaraldehyde retains phosphoproteins in bone, with or without demineralization, while being adequate for immunocytochemical localization of certain bone matrix proteins and that an understanding of the action of specimen preparation on organic constituents (as well as inorganic components) is essential for accurately describing ultrastructural matrix-mineral relationships." @default.
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- W2171411565 date "1991-09-01" @default.
- W2171411565 modified "2023-10-15" @default.
- W2171411565 title "Effects of fixation and demineralization on the retention of bone phosphoprotein and other matrix components as evaluated by biochemical analyses and quantitative immunocytochemistry" @default.
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- W2171411565 doi "https://doi.org/10.1002/jbmr.5650060907" @default.
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