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Peculiar storage cells appearing in bone marrow aspirates from a patient with juvenile GM1-gangliosidosis and from one with beta-thalassemia were examined light microscopically, histochemically and electron microscopically. Light microscopically, most of the storage cells closely resembled Gaucher cells pathognomonic for Gaucher's disease. The cytoplasm of the Gaucher-like cells contained numerous variable-shaped membrane-bound inclusions mostly arranged in a mosaic pattern and filled with fibrillar materials. Intermingled tubular structures were usually narrow as compared to those of the Gaucher cells. These ultrastructural differences of the stored materials between the Gaucher-like cells and Gaucher cells were more clearly substantiated by the high resolution electron microscopy with negative staining technique. Enzyme cytochemically, acid phosphatase activity was proved in or around the storage inclusions, suggesting their lysosomal origin. Histochemically, it might be suggested that the stored materials of the Gaucher-like cells in juvenile GMI-gangliosidosis were non-sulfated acid mucopolysaccharides and glycopeptides, whereas glycoproteins were the major component of the storage cells in beta-thalassemia. Possible mechanisms of storage in the Gaucher-like cells were discussed in both disorders.
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