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A role for IkappaB kinase 2 in bipolar spindle assembly.

Irelan, Jeffrey and Murphy, Thomas and DeJesus, Paul and Teo, Hsiangling and Xu, Dingyue and Gomez--Ferreria, Maria and Zhou, Yingyao and Miraglia, Loren and Rines, Daniel and Verma, Inder and Sharp, David and Tergaonkar, Vinay and Chanda, Sumit (2007) A role for IkappaB kinase 2 in bipolar spindle assembly. Proceedings of the National Academy of Sciences of the United States of America, 104 (43). pp. 16940-16945. ISSN 0027-8424

Abstract

IkappaB kinase 2 (IKK2 or IKKbeta) is a component of the IKK complex that coordinates the cellular response to a diverse set of extracellular stimuli, including cytokines, microbial infection, and stress. In response to an external stimulus, the complex is activated, resulting in the phosphorylation and subsequent proteasome-mediated degradation of IkappaB proteins. This event triggers the nuclear import of the NF-kappaB transcription factor, which activates the transcription of genes that regulate a variety of fundamental biological processes, including immune response, cell survival, and development. Here, we define an essential role for IKK2 in normal mitotic progression and the maintenance of spindle bipolarity. Chemical and genetic perturbation of IKK2 promotes the formation of multipolar spindles and chromosome missegregation. Depletion of IKK2 results in the deregulation of Aurora A protein stability and coincident hyperactivation of a putative Aurora A substrate, the mitotic motor KIF11. These data support a function for IKK2 as an antagonist of Aurora A signaling during mitosis. Additionally, our results indicate a direct role for IKK2 in the maintenance of genome stability and underscore the potential for oncogenic consequences in targeting this kinase for therapeutic intervention.

Item Type: Article
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Additional Information: free final full text version available at publisher's official URL and at PubMedCentral; author can archive post-print (ie final draft post-refereeing); Publisher's version/PDF cannot be used
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Date Deposited: 14 Dec 2009 14:05
Last Modified: 31 Jan 2013 01:28
URI: https://oak.novartis.com/id/eprint/106

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