Abstract
The dysregulation of miR-1224-5p has been reported in several human cancers. However, the expression and function of miR-1224-5p in glioma remains unknown. The aim of our study was to investigate the effect of miR-1224-5p on glioma cells and to determine its functional signaling mediators. Using 198 glioma samples within the Chinese Glioma Genome Atlas expression dataset, we demonstrated that miR-1224-5p expression is decreased in high-grade gliomas when compared with low-grade gliomas. Differential miR-1224-5p expression in 50 randomly selected samples was verified by in situ hybridization. The expression of miR-1224-5p was shown to positively correlate with overall survival in 82 glioblastoma patients. Exogenous expression of miR-1224-5p in glioma cells suppressed proliferation and invasion and promoted apoptosis. Target prediction algorithms identified a consensus miR-1224-5p recognition site in the 3′UTR of the cAMP response element-binding protein (CREB1) gene, and this sequence was shown to directly confer miR-1224-5p repression in luciferase reporter assays. Furthermore, exogenous miR-1224-5p expression was shown to down-regulate CREB1, as well as its downstream target genes matrix metalloproteinase-9 and B-cell lymphoma-2. Conversely, over-expression of CREB1 reversed the effect of miR-1224-5p on the proliferation, invasion, and apoptosis of glioma cells. These data indicate that miR-1224-5p may inhibit tumor-associated activity in malignant gliomas by targeting CREB1.
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Acknowledgments
This work was supported by grants from the National High Technology Research and Development Program of China (863) (2012AA02A508), the Research Special Fund For Public Welfare Industry of Health (201402008), National Natural Science Foundation of China (91229121, 81272792, 81472362, 81172389, 81372709, 81302185), Jiangsu Province’s Natural Science Foundation (20131019), Jiangsu Province’s Key Provincial Talents Program (RC2011051), Jiangsu Province’s Key Discipline of Medicine (XK201117), Jiangsu Provincial Special Program of Medical Science (BL2012028), and Program for Development of Innovative Research Team in the First Affiliated Hospital of NJMU, and the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).
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Jin Qian, Rui Li, and Ying-Yi Wang contributed equally to this work.
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Qian, J., Li, R., Wang, YY. et al. MiR-1224-5p acts as a tumor suppressor by targeting CREB1 in malignant gliomas. Mol Cell Biochem 403, 33–41 (2015). https://doi.org/10.1007/s11010-015-2334-1
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DOI: https://doi.org/10.1007/s11010-015-2334-1