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MDM2 expression is repressed by the RNA-binding protein RNPC1 via mRNA stability.

Abstract：

:The RNA-binding protein (RBP) RNPC1 is a target of the p53 family and forms a feedback regulatory loop with the p53 family proteins. The murine double minute-2 (MDM2) oncogene, a key negative regulator of p53, has a critical role in a variety of fundamental cellular processes. MDM2 expression is found to be regulated via gene amplification, transcription, protein translation and protein stability. In the current study, we reported a novel regulation of MDM2 by RNPC1 via mRNA stability. Specifically, we found that overexpression of RNPC1 decreases, whereas knockdown or knockout of RNPC1 increases, the level of MDM2 transcript and protein independent of p53. To uncover the underlying mechanism, we found that RNPC1 is able to destabilize the MDM2 transcript via binding to multiple AU-/U-rich elements in MDM2 3'untranslated region (3'UTR). Consistent with this, we showed that RNPC1 inhibits expression of exogenous MDM2 from an expression vector as long as the vector contains an AU-/U-rich element from MDM2 3'UTR. Finally, we showed that the RNA-binding activity of RNPC1 is required for binding to MDM2 transcript and consequently, for inhibiting MDM2 expression. Together, we uncover a novel regulation of MDM2 by the RBP RNPC1 via mRNA stability.

journal_name

Oncogene

journal_title

Oncogene

authors

Xu E,Zhang J,Chen X

doi

10.1038/onc.2012.238

subject

Has Abstract

pub_date

2013-04-25 00:00:00

pages

2169-78

issue

17

eissn

0950-9232

issn

1476-5594

pii

onc2012238

journal_volume

32

pub_type

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