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Abstract
Abstract Aberrant microRNAs (miRNAs) expressions are often happened in cancer. In order to identify miRNAs altered in oral carcinogenesis, we investigated miRNAs and cDNA expression profiles in 40 pair-wise oral squamous cell carcinoma (OSCC) specimens. Eighty-four miRNAs were differentially expressed in the OSCC specimens compared to the matched tissue. Interestingly, 19 down-regulated miRNAs are clustered in DLK-1/Meg3 imprinted domain of chromosome 14q32.2 region. Loss of 14q32.2-miRNAs expression also raised the 14q32.2-miRNA targets expression in OSCC. We identified one target protein, Wnt-7b, was highly expressed in OSCC and regulated by miR-329 and -410. Wnt-7b increased the Wnt/β-catenin signaling activity and promoted OSCC tumor progression. Furthermore we also identify the regulation mechanism that down-regulated 14q32.2 miRNAs. Hyper-methylation in meg-3 differential methylated region (DMR) was confirmed by bisulfate sequencing. The hyper-methylation of meg-3 DMR was also induced by betel nuts extract exposure. In summary, we identified the expression signature of aberrant miRNAs in OSCC and provide a novel molecular insight how betel quid contribute to oral carcinogenesis through the epigenetic silencing of tumor suppressor miRNAs targeting the Wnt/β-catenin signaling pathway. Note: This abstract was not presented at the meeting. Citation Format: Wei-Min Chang, Yuan-Ming Hsu, Sung-Tau Chou, Yi-Shing Shieh, Michael Hsiao, Jenn-Ren Hsiao, Jang-Yang Chang, Shine-Gwo Shiah. Identification of oral carcinoma miRNA signature and control OSCC tumorigenesis through Wnt/β-catenin signaling. [abstract]. In: Proceedings of the 105th Annual Meeting of the American Association for Cancer Research; 2014 Apr 5-9; San Diego, CA. Philadelphia (PA): AACR; Cancer Res 2014;74(19 Suppl):Abstract nr 1487. doi:10.1158/1538-7445.AM2014-1487
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