PPM1D controls nucleolar formation by up-regulating phosphorylation of nucleophosmin.

Abstract:

:An increase of nucleolar number and size has made nucleoli essential markers for cytology and tumour development. However, the underlying basis for their structural integrity and abundance remains unclear. Protein phosphatase PPM1D was found to be up-regulated in different carcinomas including breast cancers. Here, we demonstrate for the first time that PPM1D regulates nucleolar formation via inducing an increased phosphorylation of the nucleolar protein NPM. We show that PPM1D overexpression induces an increase in the nucleolar number regardless of p53 status. We also demonstrated that specific sequential phosphorylation of NPM is important for nucleolar formation and that PPM1D is a novel upstream regulator of this phosphorylation pathway. These results enhance our understanding of the molecular mechanisms that govern nucleoli formation by demonstrating that PPM1D regulates nucleolar formation by regulating NPM phosphorylation status through a novel signalling pathway, PPM1D-CDC25C-CDK1-PLK1.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Kozakai Y,Kamada R,Furuta J,Kiyota Y,Chuman Y,Sakaguchi K

doi

10.1038/srep33272

subject

Has Abstract

pub_date

2016-09-13 00:00:00

pages

33272

issn

2045-2322

pii

srep33272

journal_volume

6

pub_type

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