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Axin Localizes to Mitotic Spindles and Centrosomes in Mitotic Cells

Axin Localizes to Mitotic Spindles and Centrosomes in Mitotic Cells

Shi-Mun Kim, Eun-Jin Choi, Ki-Joon Song, Sewoon Kim, Eunjeong Seo, Eek-Hoon Jho, Sun-Ho Kee

Exp Cell Res. 2009 Apr 1;315(6):943-54.

PMID: 19331826

Abstract:

Wnt signaling plays critical roles in cell proliferation and carcinogenesis. In addition, numerous recent studies have shown that various Wnt signaling components are involved in mitosis and chromosomal instability. However, the role of Axin, a negative regulator of Wnt signaling, in mitosis has remained unclear. Using monoclonal antibodies against Axin, we found that Axin localizes to the centrosome and along mitotic spindles. This localization was suppressed by siRNA specific for Aurora A kinase and by Aurora kinase inhibitor. Interestingly, Axin over-expression altered the subcellular distribution of Plk1 and of phosphorylated glycogen synthase kinase (GSK3beta) without producing any notable changes in cellular phenotype. In the presence of Aurora kinase inhibitor, Axin over-expression induced the formation of cleavage furrow-like structures and of prominent astral microtubules lacking midbody formation in a subset of cells. Our results suggest that Axin modulates distribution of Axin-associated proteins such as Plk1 and GSK3beta in an expression level-dependent manner and these interactions affect the mitotic process, including cytokinesis under certain conditions, such as in the presence of Aurora kinase inhibitor.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
IAR42417729	Monoclonal Anti-hPlk1 (Polo Like Kinase 1) antibody produced in mouse			Price

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