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Cytochemical characterization of basement membranes in the enamel organ of the rat incisor

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Abstract

Ameloblasts are unique epithelial cells, in that once they have deposited the entire thickness of enamel and the process of maturation begins, they reform a basal lamina-like structure at their apical surface. In order to characterize further this basal lamina, its composition was analysed using (1) lectin-gold cytochemistry for glycoconjugates, (2) high-iron diamine (HID) staining for sulfated glycoconjugates and (3) immunogold labeling for collagen type IV and laminin. The labeling patterns were compared to that of other more “typical” basement membranes found in the enamel organ. Sections of rat incisor enamel organs embedded in Lowicryl K4M were stained with Helix pomatia agglutinin (HPA), Ricinus communis I agglutinin (RCA), wheat germ agglutinin (WGA) and Ulex europaeus I agglutinin (UEA). Samples from the late maturation stage were also reacted en bloc with lectins and embedded in Epon for transmission electron microscopic examination or prepared for scanning electron microscopy. Such samples were also stained with HID and conventionally processed for Epon embedding. Tissue sections were then reacted with thiocarbohydrazide-silver proteinate (TCH-SP). Analysis of the lectin labeling suggested that the region of extracellular matrix immediately adjacent to ameloblasts, where the basal lamina is situated, was intensely reactive with HPA and RCA, moderately reactive with WGA, and weakly reactive with UEA. In general, other basement membranes were mildly reactive with all lectins used. No HID-TCH-SP staining was observed directly over the basal lamina while numerous stain deposits were present over other basement membranes of the enamel organ. Immunolocalization of collagen type IV and laminin yielded a weak and variable labeling over the basal lamina. These results are consistent with the concept of basement membrane heterogeneity and, although the precise nature and composition of the basal lamina associated with maturation stage ameloblasts remain to be determined, they suggest that it may possibly function as a specialized basement membrane with particular compositional characteristics.

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  1. Y. Kogaya

    Present address: Department of Oral Anatomy, Asahi University School of Dentistry, 1851 Hozumi, Hozumi-Cho, 501-02, Gifu, Japan

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  1. Départment de stomatologie, Faculté de médecine dentaire, Université de Montréal, C.P. 6128, Succ. A, H3C 3J7, Montreal, Québec, Canada

    A. Nanci, S. Zalzal & Y. Kogaya

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Nanci, A., Zalzal, S. & Kogaya, Y. Cytochemical characterization of basement membranes in the enamel organ of the rat incisor. Histochemistry 99, 321–331 (1993). https://doi.org/10.1007/BF00269105

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