Nuclear accumulation of annexin A2 contributes to chromosomal instability by coilin-mediated centromere damage

Abstract

Most human cancers show chromosomal instability (CIN), but the precise mechanisms remain uncertain. Annexin A2 is frequently overexpressed in human cancers, and its relationship to tumorigenesis is poorly understood. We found that annexin A2 is overexpressed in the nuclei of CIN cells compared with cells with microsatellite instability (MIN). Ectopic annexin A2 expression in MIN cells results in a high level of aneuploidy and induces lagging chromosomes; suppression of annexin A2 in CIN cells reduces such CIN signatures with apoptosis of highly aneuploid cells. Ectopic expression of annexin A2 in MIN cells reduces the expression of centromere proteins. Conversely, annexin A2-knockdown in CIN cells increases the expression of centromere proteins. Moreover, the endogenous expression levels of centromere proteins in CIN cells were greatly reduced compared with MIN cell lines. The reduced expression of centromere proteins likely occurred due to aberrant centromere localization of coilin, a major component of the Cajal bodies. These results suggest that nuclear accumulation of annexin A2 has a crucial role in CIN by disrupting centromere function.

Journal

Title: Oncogene

Abbreviated Title: Oncogene

Publisher: Springer Nature

ISSN (Print): 0950-9232

ISSN (Electronic): 1476-5594

Publication date Created: October 27 2014

Publication date (Print): October 27 2014

Volume: 34

Issue: 32

Pages: 4177-4189

Article

DOI: 10.1038/onc.2014.345

PubMed ID: 25347736

Copyright statement: © 2014

Product

Self URI (article page): http://www.nature.com/doifinder/10.1038/onc.2014.345