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Cell Rep. 2018 Apr 24;23(4):1060-1071. doi: 10.1016/j.celrep.2018.03.119.

Wnt Signaling Mediates LTP-Dependent Spine Plasticity and AMPAR Localization through Frizzled-7 Receptors.

Author information

1
Department of Cell and Developmental Biology, University College London, London WC1E 6BT, UK.
2
Department of Neuroscience, Physiology and Pharmacology, University College London, London WC1E 6BT, UK.
3
Department of Cell and Developmental Biology, University College London, London WC1E 6BT, UK. Electronic address: p.salinas@ucl.ac.uk.

Abstract

The structural and functional plasticity of synapses is critical for learning and memory. Long-term potentiation (LTP) induction promotes spine growth and AMPAR accumulation at excitatory synapses, leading to increased synaptic strength. Glutamate initiates these processes, but the contribution from extracellular modulators is not fully established. Wnts are required for spine formation; however, their impact on activity-mediated spine plasticity and AMPAR localization is unknown. We found that LTP induction rapidly increased synaptic Wnt7a/b protein levels. Acute blockade of endogenous Wnts or loss of postsynaptic Frizzled-7 (Fz7) receptors impaired LTP-mediated synaptic strength, spine growth, and AMPAR localization at synapses. Live imaging of SEP-GluA1 and single-particle tracking revealed that Wnt7a rapidly promoted synaptic AMPAR recruitment and trapping. Wnt7a, through Fz7, induced CaMKII-dependent loss of SynGAP from spines and increased extrasynaptic AMPARs by PKA phosphorylation. We identify a critical role for Wnt-Fz7 signaling in LTP-mediated synaptic accumulation of AMPARs and spine plasticity.

KEYWORDS:

AMPA receptors; Frizzled-7; LTP; Sfrps; Wnt signaling; spine plasticity; synaptic plasticity

PMID:
29694885
DOI:
10.1016/j.celrep.2018.03.119
Free PMC Article

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