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Kinoshita, N. et al.

Kinoshita, Iioka, Miyakoshi, Ueno,

PKC delta is essential for Dishevelled function in a noncanonical Wnt pathway that regulates Xenopus convergent extension movements.

Protein kinase C (PKC) has been implicated in the Wnt signaling pathway; however, its molecular role is poorly understood. We identified novel genes encoding delta-type PKC in the Xenopus EST databases. Loss of PKC delta function revealed that it was essential for convergent extension during gastrulation. We then examined the relationship between PKC delta and the Wnt pathway. PKC delta was translocated to the plasma membrane in response to Frizzled signaling. In addition, loss of PKC delta function inhibited the translocation of Dishevelled and the activation of c-Jun N-terminal kinase (JNK) by Frizzled. Furthermore, PKC delta formed a complex with Dishevelled, and the activation of PKC delta by phorbol ester was sufficient for Dishevelled translocation and JNK activation. Thus, PKC delta plays an essential role in the Wnt/JNK pathway by regulating the localization and activity of Dishevelled.[1]

References

PKC delta is essential for Dishevelled function in a noncanonical Wnt pathway that regulates Xenopus convergent extension movements. Kinoshita, N., Iioka, H., Miyakoshi, A., Ueno, N. Genes Dev. (2003) [Pubmed]

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