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Heterogeneity of distribution pattern at the electron microscopic level of heparan sulfate in various basement membranes

Y Kogaya, S Kim, S Haruna and T Akisaka

Department of Oral Anatomy, Asahi University School of Dentistry, Gifu, Japan.

Using the high-iron diamine thiocarbohydrazide silver proteinate (HID- TCH-SP) staining technique and enzymatic digestion, we investigated the ultrastructural distribution pattern of heparan sulfate side chains of heparan sulfate proteoglycan (HSPG) in various basement membranes (nerve, capillary, oral epithelial, muscle, and dental basement membranes). Four different distribution patterns of stain deposits were identified as heparan sulfate on the basis of enzymatic degradation by heparitinase. In some basement membranes associated with tooth germs and oral epithelium, HID-TCH-SP stain deposits were regularly located at both sides of the lamina densa, but few were observed in the lamina densa itself. In nerve, muscle, and capillary basement membranes, the stain deposits were localized at the external side of the lamina densa adjacent to the underlying connective tissue, but were not found in the laminae lucida and densa. In the internal basal lamina of junctional epithelium of gingiva, the stain deposits were detected mainly in the lamina lucida region. Finally, in some dental and oral epithelial basement membranes, the stain deposits were randomly distributed throughout both laminae lucida and densa. Thus, the present study demonstrated distinct differences in heparan sulfate distribution pattern among various basement membranes, suggesting their architectural heterogeneity.

Volume 38, Issue 10, pp. 1459-1467, 10/01/1990
Copyright © 1990 by The Histochemical Society


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