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Proc Natl Acad Sci U S A March 27, 2001; 98 (7): 3802-7.

Cell autonomous regulation of multiple Dishevelled-dependent pathways by mammalian Nkd.

Yan D , Wallingford JB , Sun TQ , Nelson AM , Sakanaka C , Reinhard C , Harland RM , Fantl WJ , Williams LT .

Genetic studies have identified Drosophila Naked Cuticle (Nkd) as an antagonist of the canonical Wnt/beta-catenin signaling pathway, but its mechanism of action remains obscure [Zeng, W., Wharton, K. A., Jr., Mack, J. A., Wang, K., Gadbaw, M., et al. (2000) Nature (London) 403, 789--795]. Here we have cloned a cDNA encoding a mammalian homolog of Drosophila Nkd, mNkd, and demonstrated that mNkd interacts directly with Dishevelled. Dishevelled is an intracellular mediator of both the canonical Wnt pathway and planar cell polarity (PCP) pathway. Activation of the c-Jun-N-terminal kinase has been implicated in the PCP pathway. We showed that mNkd acts in a cell-autonomous manner not only to inhibit the canonical Wnt pathway but also to stimulate c-Jun-N-terminal kinase activity. Expression of mNkd disrupted convergent extension in Xenopus, consistent with a role for mNkd in the PCP pathway. These data suggest that mNkd may act as a switch to direct Dishevelled activity toward the PCP pathway, and away from the canonical Wnt pathway.

PubMed ID: 11274398
PMC ID: PMC31133
Article link: Proc Natl Acad Sci U S A

Genes referenced: dvl2 jun nkd1 tbx2

References [+] :
Axelrod, Differential recruitment of Dishevelled provides signaling specificity in the planar cell polarity and Wingless signaling pathways. 1998, Pubmed, Xenbase

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