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- W2014449216 abstract "Polo-like kinases (Plks) are a family of serine/threonine protein kinases that are involved in the regulation of the various stages of the cell cycle. Plk2 and Plk3, two members of this family, are known to interact with calcium- and integrin-binding protein 1 (CIB1). Activity of both Plk2 and Plk3 is inhibited by CIB1 in a calcium-dependent manner. However, the physiological consequences of this inhibition are not known. Here, we show that overexpression of CIB1 inhibits T47D cell proliferation. Overexpression of CIB1 or knockdown of Plk3 using shRNA produced a multinucleated phenotype in T47D cells. This phenotype was not cancer cell specific, since it also occurred in normal cells. The cells overexpressing CIB1 appear to undergo proper nuclear division, but are unable to complete the process of cytokinesis, thus forming large multinucleated cells. Both CIB1 overexpression and Plk3 knockdown disrupted microtubule organization and centrosomal segregation, which may have led to incomplete cytokinesis. The observed effect of CIB1 overexpression is not due to the inhibition of Plk2 by CIB1. Plk3 and CIB1 both colocalize at the centrosomes, however, localization of CIB1 is dependent on the expression of Plk3. Furthermore, expression of Plk3 blocks the multinucleated phenotype induced by expression of CIB1 in these cells. These results suggest that CIB1 tightly regulates Plk3 activity during cell division and that either over- or underexpression results in a multinucleated phenotype." @default.
- W2014449216 created "2016-06-24" @default.
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- W2014449216 date "2011-01-01" @default.
- W2014449216 modified "2023-09-23" @default.
- W2014449216 title "Calcium- and integrin-binding protein 1 regulates microtubule organization and centrosome segregation through polo like kinase 3 during cell cycle progression" @default.
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- W2014449216 doi "https://doi.org/10.1016/j.biocel.2010.10.003" @default.
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