High Intraepithelial Mast Cell Density in Warthin's Tumor.

BACKGROUND/AIM: Warthin's tumor, the second most frequent neoplasia of the parotid gland, is characterized by a proliferation of both epithelial and lymphoid components. In addition to epithelial and lymphoid cells, various other cell types are implicated to varying degrees in the immune response. Notably, mast cells have long been recognized as a consistent cell population within this tumor. Despite the historical acknowledgment of mast cell presence, their true distribution and significance within Warthin's tumor remain unclear. In this study, we aimed to elucidate the distribution and significance of mast cells in Warthin's tumor. MATERIALS AND METHODS: Histochemical and immunohistochemical methods were employed for the evaluation of mast cells within tumor specimens. RESULTS: Our study revealed a notable concentration of mast cells in the epithelial component of Warthin's tumor. Microscopic examination showed predominant lymphoid and epithelial elements with occasional cystic formations. Immunohistochemical analysis identified mast cells in both components, emphasizing their role in the tumor microenvironment. Double immunostaining (mast cell tryptase and CD34) revealed no significant correlation between mast cells and blood vessels. Intraepithelial mast cells (IEMCs) had a significantly higher density in the epithelial component, suggesting a potential association with the tumor's benign nature. The relationship between IEMCs and epithelial cells, especially in the presence of cystic structures, offers valuable insights into the unique features of Warthin's tumor. CONCLUSION: Our study contributes to the understanding of mast cells in Warthin's tumor, highlighting a substantial concentration within the epithelial component. This knowledge may pave the way for further investigations into the roles of mast cells in the pathogenesis and treatment of Warthin's tumor.

Clinical-statistical study on oral rehabilitation methods using dental implants.

Background and aims: The development of dental implantology is based on a thorough examination of the interaction of implants with the surrounding tissues, as well as methods of stimulating osteogenesis around implants. The most common approach to restore lost dentition in terms of function and aesthetics is now represented by implants. The objective of our study was to comparatively assess the efficiency of prosthetic treatments performed on implants alone versus on implants in conjunction with abutment teeth. Methods: The study was carried out over seven years (2016-2023), with evaluations at one, two, three, and five years. For this analysis, MedCalc® version 12.5.0.0 (MedCalc® Software, Mariakerke, Belgium) was utilised as the medical statistical software. Results and conclusions: When using dental implants and natural teeth abutments for prosthodontic reconstruction, the failure rates rise approximately 43 times when compared to dental implant rehabilitation; similarly, osteoporosis and diabetes mellitus increase failure rates by 32 and 20 times, respectively. Gingival inflammation is a frequent event (almost 50% frequency) observed during follow-up of patients who had prosthetic restoration using dental implants alone as well as implants and abutment teeth. For both groups, difficulties usually arise two years later.

Eugenol Induces Apoptosis in Tongue Squamous Carcinoma Cells by Mediating the Expression of Bcl-2 Family.

Head and neck squamous cell carcinoma is highly aggressive type of cancer for which the available treatment often causes patients severe side effects. Eugenol (Eug) is the major active constituent of clove essential oil and is known to possess antitumor properties. The present study aimed to assess the in vitro cytotoxicity of eugenol in SCC-4, tongue squamous carcinoma cells, and also in HGF, human gingival fibroblasts. Both cell lines were treated with five concentrations of Eug (0.1-1 mM) for 72 h. Cellular viability was assessed, followed by cellular morphological evaluation and by staining of the nuclei and cytoskeleton. RT-PCR was conducted in order to find the effect eugenol had on the expression on Bad, Bax, and Bcl-2 genes. Eugenol induced a dose-dependent decrease in viability in both cell lines, with the SCC-4 cells being significantly more affected. HGF cells detached from the plate at the highest concentrations used, while SCC-4 cells changed their morphology in a dose-dependent manner, with rounding, floating cells, and confluency loss being observed. Apoptotic-like signs such as chromatin and actin filaments condensation were clearly seen in SCC-4 cells, while RT-PCR revealed a significantly increased expression of pro-apoptotic genes Bax and Bad. Therefore, eugenol exerts its cytotoxic effect in tongue squamous cell carcinoma through inducing apoptosis.