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Osteocyte ultrastructure in renal osteodystrophy

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Summary

The ultrastructure of the osteocyte has been studied in 80 needle biopsies from the iliac crest of uremic subjects with renal osteodystrophy.

Different types of osteocytes were present in the osseous trabeculae. Those recognizable in completely uncalcified osteoid tissue looked like normal osteocytes, even though the matrix was not mineralized. Those present in hypomineralized areas showed enlarged and irregular lacunae when examined under the light microscope; under the electron microscope these osteolytic-like changes were not evident and were found to have been produced by defective calcification of the perilacunar matrix. Osteocytes placed in matrix whose mineralization was normal were often surrounded by a border of crystals protruding side-to-side from the bone matrix into the lacunar space. Other osteocytes were placed in unusually wide lacunae. They showed evidence of osteolytic activity, chiefly consisting of irregularity of the lacunar wall, presence of flocculent, granular and filamentous material in the pericellular space, and calcification of mitochondria. Degenerating and degenerate osteocytes were also recognizable.

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  1. 1st Institute of Pathological Anatomy and Laboratory of Histochemistry, University of Rome, I-00161, Rome, Italy

    Ermanno Bonucci & Giorgio Gherardi

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  1. Ermanno Bonucci
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  2. Giorgio Gherardi
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Bonucci, E., Gherardi, G. Osteocyte ultrastructure in renal osteodystrophy. Virchows Arch. A Path. Anat. and Histol. 373, 213–231 (1977). https://doi.org/10.1007/BF00432238

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