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J Cell Sci. 2018 Jul 9;131(13). pii: jcs216101. doi: 10.1242/jcs.216101.

Wnt7b signalling through Frizzled-7 receptor promotes dendrite development by coactivating CaMKII and JNK.

Author information

1
Laboratorio de Toxicología Experimental, Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario, Argentina.
2
Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), 2000 - Rosario, Argentina.
3
Departamento de Química Biológica-CIQUIBIC, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba-CONICET, 5000 - Córdoba, Argentina.
4
Department of Cell and Developmental Biology, University College London, London WC1E 6BT, UK.
5
Laboratorio de Toxicología Experimental, Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario, Argentina srosso@fbioyf.unr.edu.ar.

Abstract

The formation of complex dendritic arbors is crucial for the assembly of functional networks as abnormal dendrite formation underlies several neurodevelopmental and psychiatric disorders. Many extracellular factors have been postulated as regulators of dendritic growth. Wnt proteins play a critical role in neuronal development and circuit formation. We previously demonstrated that Wnt7b acts through the scaffold protein dishevelled 1 (Dvl1) to modulate dendrite arborisation by activating a non-canonical Wnt signalling pathway. Here, we identify the seven-transmembrane frizzled-7 (Fz7, also known as FZD7) as the receptor for Wnt7b-mediated dendrite growth and complexity. Importantly, Fz7 is developmentally regulated in the intact hippocampus, and is localised along neurites and at dendritic growth cones, suggesting a role in dendrite formation and maturation. Fz7 loss-of-function studies demonstrated that Wnt7b requires Fz7 to promote dendritic arborisation. Moreover, in vivo Fz7 loss of function results in dendritic defects in the intact mouse hippocampus. Furthermore, our findings reveal that Wnt7b and Fz7 induce the phosphorylation of Ca2+/calmodulin-dependent protein kinase II (CaMKII) and JNK proteins, which are required for dendritic development. Here, we demonstrate that Wnt7b-Fz7 signals through two non-canonical Wnt pathways to modulate dendritic growth and complexity.

KEYWORDS:

CaMKII; Dendrite development; Fz receptor; JNK; Neuron; Wnt signalling

PMID:
29898920
DOI:
10.1242/jcs.216101
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Conflict of interest statement

Competing interestsThe authors declare no competing or financial interests.

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