Abstract
Purpose
RUNX3 is a functionally important component in transforming growth factor-beta (TGF-β) mediated signaling pathway. Epigenetic silencing expression of RUNX3, as well as aberrant cytoplasmic retention of RUNX3 protein are causely involved in gastric carcinogenesis. Here, we examined the expression of RUNX3 gene and protein in oral squamous cell carcinomas (OSCCs) and analyzed the methylation status of RUNX3 promoter region.
Methods
About 10 normal oral mucosa and 30 OSCCs were collected to examine RUNX3 expression by RT-PCR analysis and immunohistochemistry assay using anti-RUNX3 monoclonal antibody R3-6E9. Methylation-specific PCR was carried out on the same specimens to analyze the methylation status of RUNX3 promoter. In addition, the stored paraffin-embedded specimens, including 40 oral leucoplakia (OLK) and 120 OSCCs, were examined by immunohistochemistry assay.
Results
RUNX3 gene and protein were underexpressed in OSCCs due to promoter hypermethylation. Protein mislocalization occured frequently. Both downregulation of RUNX3 protein expression (P = 0.001) and protein mislocalization (P = 0.001) were correlated with the differentiation grades in OSCCs.
Conclusions
RUNX3 plays an important role in oral carcinogenesis. It may be a useful diagnostic marker and a potential therapeutic target for OSCC.
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Abbreviations
- MSP:
-
Methylation-specific PCR
- OLK:
-
Oral leukoplakia
- OSCC:
-
Oral squamous cell carcinoma
- RUNX3:
-
Runt-related transcription factor 3
- TGF-β:
-
Transforming growth factor-β
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Acknowledgments
We acknowledge the grant support from Oncology Research Institute, National University of Singapore, National Natural Science Foundation of China (No. 30300387, 30471891, 30672323), New Century Talents Support Program of MOE(NCET-04-0865), Specialized Research Fund for the Doctoral Program of Higher Education (No.20040610077), Applied Basic Investigation Foundation of Sichuan (No.035G022-004).
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There is no conflict of interest in this study.
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F. Gao and C. H. Huang contributed equally to this article.
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Gao, F., Huang, C., Lin, M. et al. Frequent inactivation of RUNX3 by promoter hypermethylation and protein mislocalization in oral squamous cell carcinomas. J Cancer Res Clin Oncol 135, 739–747 (2009). https://doi.org/10.1007/s00432-008-0508-x
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DOI: https://doi.org/10.1007/s00432-008-0508-x