We have previously demonstrated that stromal cell-derived factor (SDF)-1/CXCR4 system enhances the metastases of oral cancer cells via induction of metabotropic glutamate receptor (mGluR) 5. However, the mechanism(s) of mGluR5 expression induced by the SDF-1/CXCR4 system are largely unknown. Recently, small non-coding RNAs, microRNAs (miRNAs) are involved in the metastatic process of several types of cancers. In this study, we examined the miRNA association involved in the mGluR5 expression using oral cancer cells, B88, which express functional CXCR4 and exhibit highly metastatic potentials. We examined the metastasis-related miRNAs in SDF-1 stimulated B88 cells by use of a miRNA microarray analysis. Consequently, we isolated miR-30 family which has predictive binding sites in 3’-UTR of mGluR5 mRNA in silico analysis. Among these miRNAs, we confirmed the downregulation of all miR-30 family in SDF-1 stimulated B88 cells by the real-time PCR analysis. Next, we transfected these miR-30 families in SDF-1 stimulated B88 cells. We confirmed the downregulation of mGluR5 by the miR-30a-5p and miR-30c-5p overexpression. These results indicated that SDF-1/CXCR4 system might regulate the metastases of oral cancer by the upregulation of mGluR5 via downregulation of miR-30 family.

Citation Format: Nobuyuki Kuribayashi, Daisuke Uchida, Makoto Kinouchi, Chikako Koshiji, Sayaka Izumi, Kembun Hakata, Yuske Komiyama, Shuji Tsuchida, Tomonori Hasegawa, Hitoshi Kawamata. Regulation of metabotropic glutamate receptor 5 expression by the miR-30 downregulation induced by the SDF-1/CXCR4 system in oral cancer cells. [abstract]. In: Proceedings of the 107th Annual Meeting of the American Association for Cancer Research; 2016 Apr 16-20; New Orleans, LA. Philadelphia (PA): AACR; Cancer Res 2016;76(14 Suppl):Abstract nr 1925.