Immunohistochemical Study of Cytokeratin Patterns in Follicular and Plexiform Ameloblastoma

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The distribution of cytokeratin was investigated in follicular and plexiform ameloblastomas using immunohistochemical methods. The findings were compared with that of human fetal oral mucosa, developing tooth germ and adult gingiva. The following cytokeratin antibodies were used:CK-1,SE-K,NSE-K and 19-K. In the follicular ameloblastoma, the cytokeratin pattern of nest's structure was not comparable to that of the enamel organ at the bell stage. The peripheral columnar cells reacted positively for NES-K and 19-K and negatively for SE-K. The central stellate reticulum-like cells showed an immunoreactivity with all used markers of cytokeratins, as well as the outer enamel epithelium. In the plexiform ameloblastoma, the immunoreaction pattern was like that of the oral mucosal epithelium of the fetus. Both the central and peripheral cells demonstrated positive reactions with SE-K and 19-K but not with NSE-K. In the developing teeth, SE-K, NES-K and 1999-K were well demonstrated in the dental lamina, and each layer of the enamel organ. In the adult gingiva, contrary to the fetal oral mucosa, the basal cells did not show an immunoreactivity with 19-K except for Merkel cells. A clear difference in cytokeratin pattern was noted between ameloblastoma and tooth germs. Especially, the reactive pattern of NSE-K and 19-K showed differences between the peripheral columnar cells of ameloblastoma and the inner enamel epithelium. These findings support the concept that the columnar cells of follicular ameloblastomas have little resemblance to the pre-ameloblast like cells in the cytokeratin distribution.
硬組織再生生物学会の論文

Immunohistochemical Study of Cytokeratin Patterns in Follicular and Plexiform Ameloblastoma

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