PMID: 11310510Apr 20, 2001Paper

Abortive secretion of an enamel matrix in the inner enamel epithelial cells during an enameloid formation in the gar-pike, Lepisosteus oculatus (Holostei, Actinopterygii)

Archives of Histology and Cytology
M IshiyamaH Shimokawa

Abstract

The tooth in the gar-pike, Lepisosteus oculatus, an actinopterygian fish, is characterized by the occurrence of both enamel and enameloid, the former covering the tooth shaft and the latter, the tooth cap. Our previous research demonstrated that the enamel in this species was, as in the lungfish, immunoreactive for amelogenin, indicating its homologous nature with the mammalian tooth enamel, whereas the enameloid was completely immunonegative. The present study demonstrates that, during the early maturation stage of the enameloid formation, the inner enamel epithelial cells (IEECs) synthesize through a well-developed Golgi apparatus a fine-granular substance which is intensely immunoreactive for amelogenin. This substance was accumulated in a large saccule extended in a suprabasal zone of the cell; we were unable to find any morphological sign indicating a connection of the substance with the enameloid matrix. The abortive secretion of the enamel matrix-like substance in the IEEC during an enameloid formation was considered to be an instance of rudimental enamel formation. In the gar-pike, the synthesis of amelogenin in the IEEC has been demonstrated to occur independently from that of the enameloid matrix. The present findings...Continue Reading

References

Jan 1, 1978·Archives of Oral Biology·R P Shellis, D F Poole
Jan 1, 1990·Archives of Oral Biology·M Ishiyama, Y Teraki
Jul 1, 1969·Archives of Oral Biology·M H Hobdell, W A Miller
Mar 29, 1969·Nature·W A Miller
Feb 2, 2000·Cell and Tissue Research·P G SatchellT G Diekwisch

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Citations

Feb 27, 2014·Journal of Dental Research·N Assaraf-WeillT Davit-Béal
Jun 24, 2017·Journal of Experimental Zoology. Part B, Molecular and Developmental Evolution·Kazuhiko KawasakiMikio Ishiyama

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