Fine structural and cytochemical observations of dental epithelial cells during the enameloid formation stages in red stingrays Dasyatis akajei

Journal of Morphology
I Sasagawa

Abstract

The fine structure and the localization of nonspecific acid phosphatase (ACPase), nonspecific alkaline phosphatase (ALPase), and calcium-dependent adenosine triphosphatase (Ca-ATPase) activities in the dental epithelial cells in tooth germs of Dasyatis akajei in the later stages of enameloid formation were investigated. Numerous invaginations of the distal cell membrane of the inner dental epithelial (IDE) cells were observed at the early stage of enameloid maturation. The invaginations contain many fine granular and filamentous substances; the lamina densa, which was thicker during the former stages, is obscure. Granules exhibiting defined ACPase activity were usually found in the IDE cells during the stages of enameloid mineralization and maturation. IDE cells are putatively involved in the removal of degenerated enameloid matrix during these stages. Marked ALPase activity was detected at the proximal and the lateral cell membranes of the IDE cells from the late stage of enameloid matrix formation to the early stage of enameloid maturation. Strong activity of Ca-ATPase was localized at the proximal and the lateral cell membranes of the IDE cells during the stages of enameloid mineralization and maturation. ALPase and Ca-ATPas...Continue Reading

References

Sep 1, 1978·Archivum Histologicum Japonicum = Nihon Soshikigaku Kiroku·M Yamada, H Ozawa
Sep 1, 1984·The Journal of Nihon University School of Dentistry·T InageT Takezawa

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Citations

Nov 14, 2002·Microscopy Research and Technique·Ichiro Sasagawa
May 9, 2009·Journal of Anatomy·Jean-Yves SireMatthews K Vickaryous
Jul 14, 2007·Cells, Tissues, Organs·Jean-Yves SireXun Gu

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