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549797 
Journal Article 
Nucleophosmin is required for chromosome congression, proper mitotic spindle formation, and kinetochore-microtubule attachment in HeLa cells 
Amin, MA; Matsunaga, S; Uchiyama, S; Fukui, K 
2008 
Yes 
FEBS Letters
ISSN: 0014-5793
EISSN: 1873-3468 
582 
27 
3839-3844 
Nucleophosmin (NPM) is an abundantly expressed multifunctional nucleolar phosphoprotein. Here we show that depletion of NPM by RNA interference causes defects in cell division, followed by an arrest of DNA synthesis due to activation of a p53-dependent checkpoint response in HeLa cells. Depletion of NPM leads to mitotic arrest due to spindle checkpoint activation. The mitotic cells arrested by NPM depletion have defects in chromosome congression, proper mitotic spindle and centrosome formation, as well as defects in kinetochore-microtubule attachments. Loss of NPM thus causes severe mitotic defects and delayed mitotic progression. These findings indicate that NPM is essential for mitotic progression and cell proliferation. 
HeLa cell; RNAi; siRNA; Nucleophosmin; Mitosis