期刊
CELL CYCLE
卷 5, 期 24, 页码 2899-2902出版社
TAYLOR & FRANCIS INC
DOI: 10.4161/cc.5.24.3567
关键词
p21; centrosome; CDK2; genomic instability; cancer
类别
资金
- NCI NIH HHS [R01 CA112598-03, R01 CA112598] Funding Source: Medline
Inactivation of the cyclin-dependent kinase (CDK) inhibitor p21(Waf1/Cip1) (CDKN1; hereafter p21) has previously been implicated in the induction of numerical centrosome alterations. It is unclear, however, whether p21 deficiency deregulates the centrosome duplication cycle itself or causes an accumulation of centrosomes due to cell division failure and/or polyploidization. Using a novel marker for maternal centrioles, Cep170, we show here that knock-down of p21 protein expression in murine myeloblasts can stimulate excessive centriole numbers in the presence of only one mature centriole. These results indicate that p21 deficiency can trigger a bona fide overduplication of centrioles and that aberrant centrosome numbers cannot solely be explained by polyploidization as suggested by previous studies. Our findings underscore that impaired p21 expression may function as a driving force for chromosomal instability and highlight the importance of markers for maternal centrioles such as Cep170 to elucidate the pathogenesis of numerical centriole aberrations in tumor cells.
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