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Journals The FASEB Journal November 2009

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JNK phosphorylates {beta}-catenin and regulates adherens junctions

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The c-Jun amino-terminal kinase (JNK) is an important player in inflammation, proliferation, and apoptosis. More recently, JNK was found to regulate cell migration by phosphorylating paxillin. Here, we report a novel role of JNK in cell adhesion. Specifically, we provide evidence that JNK binds to E-cadherin/β-catenin complex and phosphorylates β-catenin at serine 37 and threonine 41, the sites also phosphorylated by GSK-3β. Inhibition of JNK kinase activity using dominant-negative constructs reduces phosphorylation of β-catenin and promotes localization of E-cadherin/β-catenin complex to cell-cell contact sites. Conversely, activation of JNK induces β-catenin phosphorylation and disruption of cell contacts, which are prevented by JNK siRNA. We propose that JNK binds to β-catenin and regulates formation of adherens junctions, ultimately controlling cell-to-cell adhesion.—Lee, M.-H., Koria, P., Qu, J., Andreadis, S. T. JNK phosphorylates β-catenin and regulates adherens junctions.

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Article Details
Lee, Meng-Horng; Koria, Piyush; Qu, Jun; Andreadis, Stelios T.
The FASEB Journal , Volume 23 (11): 3874
Fed of American Socs for Experimental Biology – Nov 1, 2009
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