IMP-3 protects the mRNAs of cyclins D1 and D3 from GW182/AGO2-dependent translational repression.

Abstract:

:IGF-2 mRNA binding protein 3 (IGF2BP3, IMP-3) is a well-known post-transcriptional regulatory factor of gene expression, mainly involved in embryonic development and oncogenesis. We have previously demonstrated that a subset of IMP-3 targets, such as the mRNAs of cyclins D1, D3 and G1, are positively regulated by IMP-3, and that this regulation depends on nuclear localization of IMP-3. In the present study, we show that as a first step following a knock-down of IMP-3, the protein levels of the cyclins rapidly decrease, while their mRNAs remain stable and associated with the polyribosomes, though not translated. We have elucidated the molecular mechanisms of this regulation, demonstrating that IMP-3 and its protein partners ILF3/NF90 and PTBP1 bind to the 3'UTRs of the cyclin mRNAs and protect them from the translational repression induced by miRNA-dependent recruitment of AGO2/GW182 complex in human cancer cells.

journal_name

Int J Oncol

authors

Deforzh E,Vargas TR,Kropp J,Vandamme M,Pinna G,Polesskaya A

doi

10.3892/ijo.2016.3750

subject

Has Abstract

pub_date

2016-12-01 00:00:00

pages

2578-2588

issue

6

eissn

1019-6439

issn

1791-2423

journal_volume

49

pub_type

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