Abstract：
:Phosphorylation of histone H3 at Ser-10 is required for maintenance of properchromosome dynamics during mitosis. AIM-1, a mammalian Ipl1/aurora kinase involved in H3 phosphorylation, is transcriptionally overexpressed in many tumor cell lines. Increased expression of the AIM-1 gene has been observed in human colorectal tumors of advanced grade and stage. Here we report that forced exogenous overexpression of AIM-1 in Chinese hamster embryo cells causes increased mitotic Ser-10 phosphorylation with concomitant induction of lagging chromosomes during mitosis. Lagging chromosomes could also be induced by transfection with mutated histone H3 (S10E), which is thought to maintain Ser-10 in the phosphorylated state. In the present study, chromosome number instability and increased tumor invasiveness were noted in constitutively AIM-1-overexpressing cells in vivo. Increased mitotic Ser-10 phosphorylation was also observed in various colorectal tumor cells with high AIM-1 expression levels. These data suggest that increased H3 histone phosphorylation as a result of AIM-1 overexpression is a major precipitating factor of chromosome instability and, thus, may play a role in carcinogenesis.
journal_name
Cancer Resjournal_title
Cancer researchauthors
Ota T,Suto S,Katayama H,Han ZB,Suzuki F,Maeda M,Tanino M,Terada Y,Tatsuka Msubject
Has Abstractpub_date
2002-09-15 00:00:00pages
5168-77issue
18eissn
0008-5472issn
1538-7445journal_volume
62pub_type
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