Expression of Cell Cycle and Apoptosis-related Proteins in Sporadic Odontogenic Keratocysts and Odontogenic Keratocysts Associated with the Nevoid Basal Cell Carcinoma Syndrome
Restricted accessResearch articleFirst published online July, 1999
Expression of Cell Cycle and Apoptosis-related Proteins in Sporadic Odontogenic Keratocysts and Odontogenic Keratocysts Associated with the Nevoid Basal Cell Carcinoma Syndrome
Odontogenic keratocysts are occasionally (4-5%) associated with the nevoid basal cell carcinoma syndrome, a pleiotropic, autosomal disorder presenting a spectrum of developmental abnormalities and a predisposition for the development of different neoplasms. The aim of this study was to establish whether keratocysts showing clinically aggressive behavior associated with nevoid basal cell carcinoma syndrome reflect differences in cellular proliferation rate and/or in the expression of oncoproteins and tumor suppressor genes. For this reason, formalin-fixed paraffin-embedded sections of odontogenic keratocysts associated with the nevoid basal cell carcinoma syndrome (16 cases) and sporadic odontogenic keratocysts (16 cases) were compared for expression of proliferating cell nuclear antigen (PCNA) and p53, bcl-2, and bcl-1 (cyclin Dl) onco-proteins. Most of the epithelial lining of odontogenic keratocysts associated with the nevoid basal cell carcinoma syndrome showed nuclear immunopositivity for p53 protein and overexpression of cyclin Dl with various degrees of staining intensity. All sporadic odontogenic keratocysts were negative for p53 and cyclin Dl. The expressions of bcl-2 oncoprotein were found to be substantially similar between the two groups of lesions, with a cytoplasmic immunopositivity localized only in the resting reserve basal layer of the epithelium. PCNA expression showed no statistically significant difference between the two groups of lesions. In conclusion, the finding of cyclin Dl and p53 overexpression in odontogenic keratocysts associated with the nevoid basal cell carcinoma syndrome could be considered a hallmark of a mutated cellular phenotype, thus leading to the hypothesis that their aggressive clinical behavior could be due to a dysregulation of the expression of cyclin Dl and p53 proteins, involved in a check-point control of cellular proliferation.
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