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c-myc promoter binding protein (MBP-1) is a multi-functional protein known to regulate expression of targets involved in the malignant phenotype. We have previously demonstrated that exogenous expression of MBP-1 inhibits prostate tumor growth, although the mechanism of growth inhibition is not well understood. We hypothesized that MBP-1 may modulate microRNA (miRNA) expression for regulation of prostate cancer cell growth. In this study, we demonstrated that exogenous MBP-1 upregulates miR-29b by 5-9 fold in prostate cancer cells as measured by real-time quantitative reverse transcription-PCR. Subsequent studies indicated that exogenous expression of miR-29b inhibited Mcl-1, COL1A1, and COL4A1. Further, a novel target with potential implications for invasion and metastasis, matrix metallopeptidase-2 (MMP-2), was identified and confirmed to be a miR-29b target in prostate cancer cells. Together our results demonstrated that exogenous expression of miR-29b regulates prostate cancer cell growth by modulating anti-apoptotic and pro-metastatic matrix molecules, implicating therapeutic potential of miR-29b for prostate cancer inhibition.

MBP-1 Upregulates miR-29b, Which Represses Mcl-1, Collagens, and Matrix Metalloproteinase-2 in Prostate Cancer Cells