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- W2970364555 abstract "Abstract miR‐125a is a microRNA that is frequently diminished in various human malignancies. However, the mechanism by which impaired miR‐125a promotes cancer growth remains undefined. In this study, we investigated the role of miR‐125a in the proliferation and apoptosis of multiple myeloma (MM). To do this, we used MM tissue samples (from 40 anonymous patients), normal matched control samples, and five MM‐derived cell lines. We also established a mouse model of MM xenograft to explore the effect of overexpression of miR‐125a on the MM growth in vivo. Quantitative real‐time polymerase chain reaction revealed that the miR‐125a expression was broadly reduced in MM tissues and cell lines. The impairment of miR‐125a in MM tissues was functionally relevant because the overexpression of miR‐125a remarkably decreased the cell viability and colony‐forming activity, at least in part, by promoting apoptosis in two miR‐125a‐deficient MM cell lines: NCI‐H929 and U266. Interestingly, we also discovered that the human gene encoding the ubiquitin‐specific peptidase 5 (USP5), which is known to promote cellular deubiquitination and ubiquitin/proteasome‐dependent proteolysis, was a direct transcriptional target for miR‐125a to repress. More importantly, the heterologous expression of USP5 significantly reversed the growth‐inhibitory effects of miR‐125a on MM cells in vitro. In the mouse xenograft model, overexpressed miR‐125a prominently inhibited the growth of MM tumors and concomitantly reduced the expression of USP5 in tumor tissues. These results suggest that miR‐125a inhibits the expression of USP5, thereby mitigating the proliferation and survival of malignant MM cells. We propose that USP5 acts as an oncoprotein in miR‐125a‐missing cancers." @default.
- W2970364555 created "2019-09-05" @default.
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- W2970364555 date "2019-08-26" @default.
- W2970364555 modified "2023-09-23" @default.
- W2970364555 title "miR‐125a suppresses malignancy of multiple myeloma by reducing the deubiquitinase USP5" @default.
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- W2970364555 doi "https://doi.org/10.1002/jcb.29309" @default.
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