Sunitha Carnelio1, Hitesh Vij. 1. Department of Oral and Maxillofacial Pathology, Manipal College of Dental Sciences, Manipal, Karnataka, India. sunithacarnelio@yahoo.co.uk
Abstract
BACKGROUND: The aim of this study was to assess the expression, distribution and comparison of tenascin, a glycoprotein of the extracellular matrix in ameloblastoma and ameloblastic fibroma, both odontogenic neoplasms with diverse biological behavior and to understand the proliferative activity by using the morphometric analysis. METHODS: Paraffin embedded tissue from 25 cases of odontogenic tumors i.e., ameloblastoma (n = 15) and ameloblastic fibroma (n = 10) were used. The expression of tenascin was evaluated using immunohistochemistry. Morphometric analysis of nucleolar organizer regions (NORs) from ameloblastoma and ameloblastic fibroma was carried out by silver staining. RESULTS: A heterogeneous expression of tenascin was found in ameloblastoma which was mainly localized at the epithelial-mesenchymal interface and a patchy distribution was observed in the stroma (80%), while strong positivity was observed in the stroma and at the basement membrane zone of ameloblastic fibroma (100%). argyrophilic nucleolar organizer regions (AgNORs) revealed higher mean counts in ameloblastoma (3.093 +/- 0.902) when compared with those of ameloblastic fibroma (1.553 +/- 0.250). Ameloblastoma presented more than two NORs (two to five) per nucleus in majority of the cells, while ameloblastic fibroma exhibited only one NORs per nucleus. CONCLUSIONS: Expression of tenascin in these neoplasms suggest that it could play a role in epithelial- mesenchymal interaction, while AgNORs reveal that ameloblastomas are more aggressive when compared with ameloblastic fibromas.
BACKGROUND: The aim of this study was to assess the expression, distribution and comparison of tenascin, a glycoprotein of the extracellular matrix in ameloblastoma and ameloblastic fibroma, both odontogenic neoplasms with diverse biological behavior and to understand the proliferative activity by using the morphometric analysis. METHODS:Paraffin embedded tissue from 25 cases of odontogenic tumors i.e., ameloblastoma (n = 15) and ameloblastic fibroma (n = 10) were used. The expression of tenascin was evaluated using immunohistochemistry. Morphometric analysis of nucleolar organizer regions (NORs) from ameloblastoma and ameloblastic fibroma was carried out by silver staining. RESULTS: A heterogeneous expression of tenascin was found in ameloblastoma which was mainly localized at the epithelial-mesenchymal interface and a patchy distribution was observed in the stroma (80%), while strong positivity was observed in the stroma and at the basement membrane zone of ameloblastic fibroma (100%). argyrophilic nucleolar organizer regions (AgNORs) revealed higher mean counts in ameloblastoma (3.093 +/- 0.902) when compared with those of ameloblastic fibroma (1.553 +/- 0.250). Ameloblastoma presented more than two NORs (two to five) per nucleus in majority of the cells, while ameloblastic fibroma exhibited only one NORs per nucleus. CONCLUSIONS: Expression of tenascin in these neoplasms suggest that it could play a role in epithelial- mesenchymal interaction, while AgNORs reveal that ameloblastomas are more aggressive when compared with ameloblastic fibromas.
Authors: Amr Ibrahim; Emad Alqalshy; Ahmed Abdel-Shakour Abdel-Hafiz; Kamal Abd El-Rahman; Magdy Alazzazi Journal: Diagnostics (Basel) Date: 2022-02-03