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 Repjournal_title
Scientific reportsauthors
Kozakai Y,Kamada R,Furuta J,Kiyota Y,Chuman Y,Sakaguchi Kdoi
10.1038/srep33272subject
Has Abstractpub_date
2016-09-13 00:00:00pages
33272issn
2045-2322pii
srep33272journal_volume
6pub_type
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