Abstract
The reversion-inducing cysteine-rich protein with Kazal motifs (RECK) and glycogen synthase kinase (GSK3) are novel tumor suppressors, and emerging evidence has suggested their active role in oral cancer pathogenesis. In the present study, 112 human samples, including 55 fresh samples of 14 adjacent normal tissues, 25 noninvasive oral tumors, and 18 invasive tumors, were included. The messenger RNA (mRNA) expression, protein expression, and promoter methylation of the RECK gene, as well as the expression of GSK3β, phospho/total β-catenin, and c-myc, were measured by RT-PCR, bisulphate modification-PCR, immunohistochemistry, and Western blot analysis. Additionally, ectopic expression of in/active GSK3β was performed in cell culture experiments. This study provided information on the progressive silencing of RECK gene expression at the protein and mRNA levels paralleled with promoter hypermethylation at various stages of oral tumor invasion. RECK expression and the hypermethylation of the RECK gene promoter were negatively and positively correlated with pS9GSK3β/c-myc expression, respectively. Further, a negative trend of RECK protein expression with nuclear β-catenin expression was observed. Induced expression of active GSK3β reversed the RECK silencing in SCC9 cells. Collectively, our results demonstrated that the silencing of the RECK gene, possibly regulated by the GSK3β pathway, is an important event in oral cancer invasion and this pathway could be exploited for therapeutic interventions.
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Acknowledgments
The authors wish to acknowledge Prof. M.K. Rai (Pathologist), Director, RIMS, Ranchi, and Prof. NK Jha, Head Dept. of Surgery (and his colleagues) RIMS, Ranchi; and the Director of CARA, Cancer Hospital, Ranchi, and his colleagues Dr. M. Akhouri, Dr.(Md) Aftab A. Ansari, Dr. K. Saurav, and Dr. Raghav Sharan (Clinic), Ranchi, for their cooperation. RM thanks the M.Sc. students (Sunita, Pooja and Meher) and is thankful to Dr. Rupesh Dash, ILS, Bhubaneswar, for his kind support. The fellowship of KKP (JRF-CSIR), AKS (DBT-Research Associate), MA (Project JRF), MA, TK, and PM (CUJ Fellowship) and the financial support from the DBT, New Delhi (Project No. BT/PR4624/MED/30/701/2012; Departmental DBT Builder Programme No. BT/PR9028/INF/22/193/2013), are acknowledged.
Authors’ contributions
KKP, MA, SN, AR, and RM contributed to the IHC, WB, and RT-PCR experiments. KKP, AKS, TK, PM, and RKD contributed to the DNA methylation experiments. KKP, RM, and AR contributed to the cell culture experiments and AKP for statistics. RM has written the MS, and the final version of the MS has been approved by all the authors.
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The samples were collected after obtaining informed consent from the patients, and the use of human samples was approved by the Institutional Human Ethical Committee of CUJ. The work described has been carried out in accordance with The Code of Ethics of the World Medical Association (Declaration of Helsinki).
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Pramanik, K.K., Singh, A.K., Alam, M. et al. Reversion-inducing cysteine-rich protein with Kazal motifs and its regulation by glycogen synthase kinase 3 signaling in oral cancer. Tumor Biol. 37, 15253–15264 (2016). https://doi.org/10.1007/s13277-016-5362-x
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DOI: https://doi.org/10.1007/s13277-016-5362-x