Objective: To analyze the immunohistochemical expression of YAP and its correlation with markers involved in cell proliferation and apoptosis in benign epithelial odontogenic lesions.
Study Design: The sample consisted of 95 cases of odontogenic lesions (25 dentigerous cysts, 30 non-syndromic odontogenic keratocysts, 30 conventional ameloblastomas, and 10 unicystic ameloblastomas) and 10 dental follicles used as normal odontogenic tissue. The histological sections were submitted to immunohistochemistry with YAP, cyclin D1, Ki-67, and Bcl-2 antibodies. Immunoexpression was analyzed qualitatively and quantitatively using an adapted method. The collected data were analyzed descriptively and statistically (p ≤ 0.05).
Results: The highest YAP expression was observed in odontogenic keratocysts, followed by unicystic ameloblastomas and conventional ameloblastomas, which exhibited moderate immunoreactivity predominantly in peripheral cells. Furthermore, significant differences in YAP immunoexpression were observed between the groups analyzed, with significant positive correlations between YAP and cyclin D1 in dentigerous cysts and unicystic ameloblastomas and between YAP and Ki-67 in unicystic ameloblastomas (p < 0.05). However, there were no statistically significant correlations between YAP and Bcl-2 immunoexpression in the groups studied.
Conclusion: YAP may influence epithelial cell proliferation in odontogenic cysts and tumors, suggesting its possible participation in the progression of the odontogenic lesions studied.
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http://dx.doi.org/10.1111/odi.14882 | DOI Listing |
Semin Diagn Pathol
January 2025
Dept of Oral & Maxillofacial Pathology and Oral Microbiology, King George's Medical University, Lucknow, India. Electronic address:
Ameloblastomas (AM) are locally aggressive tumors, with hemangiomatous ameloblastoma (HA) being a rare subtype characterized by vascular proliferation, predominantly in the stroma but occasionally within the epithelial component. We report a case of a 32-year-old male with recurrent mandibular swelling, histopathologically diagnosed as unicystic HA, showing vascularity in both stroma and odontogenic epithelial islands with GLUT1 positivity in the latter. A review of 31 cases revealed a male predilection, mandibular dominance (89.
View Article and Find Full Text PDFSemin Diagn Pathol
January 2025
King George's Medical University Faculty of Dental Sciences, India. Electronic address:
Ameloblastoma is a benign odontogenic epithelial tumor characterized by its aggressive behavior and a high likelihood of local recurrence if not fully excised. Ameloblastomas are a common type of slow-growing, true jaw tumor which may present as solid, multicystic or unicystic forms and originate from odontogenic epithelium and exhibit a variety of histological patterns. Keratoameloblastoma is considered to be a rare variant of ameloblastoma associated with more intense keratinization.
View Article and Find Full Text PDFJ Clin Exp Dent
December 2024
Department of Oral Surgery and Oral Medicine, Faculty of Dentistry, Srinakharinwirot University.
Background: N6-methyladenosine (m6A), the most abundant internal RNA modification in mammals, plays a critical role in many forms of cancer. Methyltransferase-like 3 (METTL3) serves as the main catalytic subunit of the m6A writer and plays a role in the progression of head and neck squamous cell carcinoma. To date, the role of METTL3 in odontogenic lesions has never been investigated.
View Article and Find Full Text PDFHead Neck Pathol
December 2024
Institute of Pathology, Sheba Medical Center, Tel Hashomer, 5265601, Israel.
Purpose: Current standard of care for ameloblastoma (conventional/unicystic - mural type) usually mandates extensive bone resection that frequently necessitates immediate reconstruction with serious sequelae, especially among young patients. BRAF-mutated ameloblastomas can be targeted by BRAF inhibitors to markedly reduce their size, enabling conservative removal of residual tumor. We aimed to characterize the effect of post-treatment histomorphologic changes.
View Article and Find Full Text PDFAppl Immunohistochem Mol Morphol
November 2024
Department of Basic Sciences, College of Dentistry, Princess Nourah bint Abdulrahman University, 84428, Riyadh 11671, Saudi Arabia.
Odontogenic cysts and tumors exhibit a broad spectrum of biological characteristics. Despite recent advances in understanding the complex nature of these lesions, relatively less is known about the molecular markers involved in key pathogenic steps, such as proliferation and differentiation. This study aimed to elucidate the expression patterns of p63 and Ki-67 in odontogenic lesions, which may influence the management strategies.
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