ABSTRACT
INTRODUCTION: Gingiva fibromatosis is a relatively rare condition characterized by diffuse enlargement of the gingiva, which is caused by expansion and accumulation of the connective tissue. OBJECTIVE: The aim of the present study was to investigate proliferative and apoptotic biomarker expression in normal gingiva and two forms of gingival fibromatosis. METHODS: Archived tissue specimens of hereditary gingival fibromatosis, gingival fibromatosis and dental abnormality syndrome and normal gingiva were subject to morphological analysis and immunohistochemical staining. The results were analyzed statistically. RESULTS: Proteins associated with proliferation were found in the nuclei of epithelial cells from the basal and suprabasal layers, whereas apoptotic proteins were detected in the cytoplasm of the upper layers of the epithelium. Increased expressions of minichromosome maintenance proteins 2 and 5 were observed in the gingival fibromatosis and dental abnormality syndrome samples. In contrast, geminin expression was higher in normal gingiva samples. No difference in the expression of apoptotic proteins was observed among the groups. CONCLUSION: Our findings support a role for augmented proliferation of epithelial cells within the overgrown tissues associated with gingival fibromatosis or dental abnormality syndrome. However, our data suggest that different biological mechanisms may account for the pathogenesis of different types of gingival fibromatosis.
Subject(s)
Female , Humans , Male , Cell Cycle Proteins/analysis , Epithelial Cells/chemistry , Fibromatosis, Gingival/metabolism , Nuclear Proteins/analysis , Tooth Abnormalities/metabolism , Biomarkers/analysis , Case-Control Studies , Cross-Sectional Studies , Epithelial Cells/pathology , Fibromatosis, Gingival/genetics , Fibromatosis, Gingival/pathology , Immunohistochemistry , Tooth Abnormalities/genetics , Tooth Abnormalities/pathology , /analysisABSTRACT
Fibromatose gengival hereditária (FGH) é uma condição genética rara, caracterizada por crescimento gengival. O objetivo deste artigo é descrever as características clínicas, histopatológicas e genéticas de duas famílias com membros afetados por FGH. Sistematicamente, todos os membros das duas famílias foram clinicamente avalidos e, quando indicado, foram cirurgicamente tratados pela combinação de gengivectomia/gengivoplastia. Embora nas duas famílias a condição tenha sido transmitida como fenótipo isolado por padrão autossômico dominante, existiu marcada diferença na penetrância e expressividade da FGH.