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XB-ART-8792
Nat Cell Biol 2001 Jul 01;37:628-36. doi: 10.1038/35083016.
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PAR-1 is a Dishevelled-associated kinase and a positive regulator of Wnt signalling.

Sun TQ , Lu B , Feng JJ , Reinhard C , Jan YN , Fantl WJ , Williams LT .


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Wnt signalling regulates beta-catenin-dependent developmental processes through the Dishevelled protein (Dsh). Dsh regulates two distinct pathways, one mediated by beta-catenin and the other by Jun kinase (JNK). We have purified a Dsh-associated kinase from Drosophila that encodes a homologue of Caenorhabditis elegans PAR-1, a known determinant of polarity during asymmetric cell divisions. Treating cells with Wnt increases endogenous PAR-1 activity coincident with Dsh phosphorylation. PAR-1 potentiates Wnt activation of the beta-catenin pathway but blocks the JNK pathway. Suppressing endogenous PAR-1 function inhibits Wnt signalling through beta-catenin in mammalian cells, and Xenopus and Drosophila embryos. PAR-1 seems to be a positive regulator of the beta-catenin pathway and an inhibitor of the JNK pathway. These findings show that PAR-1, a regulator of polarity, is also a modulator of Wnt-beta-catenin signalling, indicating a link between two important developmental pathways.

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Species referenced: Xenopus
Genes referenced: dvl2 jun mapk8 mark2 mark3

References :
Depraetere, PAR-1 helps Wnt to get rid of JNK. 2001, Pubmed