Summary
I investigated the ultrastructural localization and histochemical properties of sulfated glycoconjugates in developing enameloid matrix of the fish Polypterus senegalus, by use of the high iron diamine thiocarbohydrazide silver proteinate (HID-TCH-SP) staining and enzymatic digestion methods. HID-TCH-SP stain deposits were localized in the dental basal lamina and in the whole thickness of developing enameloid matrix, particularly closely associated with enameloid collagen fibrils. Most HID-TCH-SP stain deposits in the enameloid were susceptible to testicular hyaluronidase but some stain deposits survived. HID-TCH-SP stain deposits in the basal lamina resisted the enzymatic digestion, and were regularly localized to the internal and external sites of lamina densa at an early stage of development, subsequently tending to be randomly arranged with the increase in thickness of enameloid matrix layer. Furthermore, enzymatic digestion with heparitinase preferentially removed HID-TCH-SP stain deposits in the region of the basal lamina. Thus, it was confirmed that most HID-TCH-SP stain deposits in developing enameloid matrix are chondroitin 4-sulfate and/or 6-sulfate and that the stain deposits in the basal lamina represent heparan sulfate. The chondroitin sulfates tended to disappear with the advancement of enameloid mineralization.
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Kogaya, Y. Histochemical properties of sulfated glycoconjugates in developing enameloid matrix of the fish Polypterus senegalus . Histochemistry 91, 185–190 (1989). https://doi.org/10.1007/BF00490130
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DOI: https://doi.org/10.1007/BF00490130