Abstract
Two weeks after a single injection of suramin, the secretory and post-secretory ameloblasts of the rat incisor were filled with large lysosome-like vacuoles. At the light-microscope level, these vacuoles were positively stained with Alcian blue when MgCl2 was used at a critical electrolyte concentration varying between 0.1 and 0.3 M, whereas no staining appeared when MgCl2 varied between 0.7 and 0.9 M. Hyaluronidase digestion markedly reduced but did not totally abolish the staining, indicating that glycosaminoglycans were accumulated inside these vacuoles. Examination of these cells with the electron microscope revealed a polymorphic population of large vesicles, filled to various degrees with cetylpyridinium chloride (CPC)-positive and malachite green aldehyde (MGA)-positive material. The same pattern was observed in secretory odontoblasts but to a lesser extent. In the extracellular matrix, suramin-induced alterations appeared as large defects occurring during enamel formation. In predentin and dentin, the number and/or size of electron-dense aggregates resulting from CPC and MGA fixation, were enhanced in the suramin-injected rats. These aggregates were largely reduced or suppressed respectively by hyaluronidase digestion and chloroform/methanol treatment of the sections. The accumulation of glycosaminoglycans and phospholipids reported here inside ameloblasts and odontoblasts and in predentin and dentin supports the occurrence of suramin-induced mucopolysaccharidosis and lipidosis in this experimental animal model.
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Gritli, A., Septier, D. & Goldberg, M. Suramin-induced mucopolysaccharidosis in rat incisor. Cell Tissue Res 273, 53–64 (1993). https://doi.org/10.1007/BF00304611
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DOI: https://doi.org/10.1007/BF00304611