Abstract
The present study focuses on the correlation between the expression pattern of β-catenin (component of Wnt signaling), ΔNp63 (proliferation marker), and Notch 1 (transmembrane receptor) in oral squamous cell carcinoma. The study also aims to investigate the interaction between β-catenin and ΔNp63 in oral cancer. Furthermore, we also analyzed the prognostic significance of β-catenin, ΔNp63, and Notch 1 in oral squamous cell carcinoma. Immunohistochemical analysis of β-catenin, ΔNp63, and Notch 1 were done in 62 cases of oral squamous cell carcinoma. Co-immunoprecipitation analysis was done to study the possible interaction between β-catenin and ΔNp63 in oral cancer. Kaplan–Meier method was used to estimate overall and disease-free survival, and the Log-rank test was used to compare the resulting curves. Statistically significant positive correlation was found between the localization of β-catenin and the expression of ΔNp63 (p = 0.001**, r s = 0.427), whereas, no significant association was found between the expression pattern of β-catenin and Notch 1. Interestingly, interaction between β-catenin and ΔNp63 was observed in oral carcinoma. Moreover, β-catenin and ΔNp63 may be related to worst survival in oral carcinoma. Statistically significant positive association between localization of β-catenin and expression of ΔNp63 suggests that they might have dependent roles in maintaining the proliferation of oral carcinoma cells. In addition, the downregulated expression of Notch 1 was related to invasion and differentiation status of oral carcinoma cells. Furthermore, β-catenin and ΔNp63 may be used as independent prognostic markers of oral carcinoma. On the other hand, interaction of β-catenin with ΔNp63 may be a key event in maintaining the proliferation of oral carcinoma cells. The present study indicates that β-catenin and ΔNp63 may be used as independent prognostic markers of oral carcinoma and the interaction of β-catenin with ΔNp63 may be a crucial event in regulating proliferation and differentiation of oral carcinoma cells, which may be used as a target for therapeutic implications.
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Acknowledgments
We acknowledge “UGC-Meritorious Research Fellowship Programme” for financial assistance. We are also grateful to Dr. Birgitte Lane (Institute of Medical Biology, Singapore) and Dr. James Direnzo (Dartmouth Medical School, USA) for providing anti-CK14 and anti-ΔNp63 antibodies, respectively. We would like to thank Dr. Angela Hague (Department of Oral and Dental Science, University of Bristol, UK) for providing H314 cell line used in this study. We also thank Dr. Mary Lilly (Professor of Pathology, Royapettah Government Hospital, Chennai, India) for her support throughout this study. Finally, we would like to acknowledge Dr. R. Ravanan (Associate Professor, Department of Statistics, Presidency College, Chennai, India) for his kind help in reviewing and revising the statistical analysis.
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Supplement Fig. 1
Overall survival of patients with oral squamous cell carcinoma according to stage (a) and beta catenin localization (c); disease-free survival of patients with oral squamous cell carcinoma according to stage (b) and beta catenin localization (d) calculated by the Kaplan–Meier method. Intra. intracellular. (JPEG 127 KB)
Supplement Table 1
Correlation of β-catenin, ΔNp63, and Notch 1 expression with clinical parameters (DOC 27 kb)
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Ravindran, G., Devaraj, H. Aberrant expression of β-catenin and its association with ΔNp63, Notch-1, and clinicopathological factors in oral squamous cell carcinoma. Clin Oral Invest 16, 1275–1288 (2012). https://doi.org/10.1007/s00784-011-0605-0
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DOI: https://doi.org/10.1007/s00784-011-0605-0