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Activation of p53 by Dishevelled independent of Wnt or planar polarity pathways.

Ding V.W., Lin L.P., Chiang A.L., McCormick F.

Dishevelled is a key component of the Wnt signaling and planar polarity pathways. We discovered that in selective cell types, it potently activates the transcriptional activity of the tumor suppressor p53. This action, however, is not dependent on the downstream of either the Wnt or the planar polarity pathways. Dishevelled signals to the first 50 amino acids of p53, which is the transactivation domain. The level of phosphorylation on several serine residues within that region of p53 increases in response to disheveled activation, partially contributing to p53 activation. The MAP kinase pathway and E1B55k may also be involved in this dishevelled-p53 connection. Our data provide evidence that there is a novel signaling pathway from Dishevelled to p53.

J. Mol. Med. 85:1281-1289(2007) [PubMed] [Europe PMC]

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