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Wnt is a zygotic effect gene that is expressed during very early embryonic development. It regulates various processes in animals starting from early development through the adult stage, such as organogenesis in the embryo and maintenance of neuronal and blood stem cells. Wnt proteins can induce a wide variety of intracellular pathways depending upon the specific abilities of different Wnt ligands to form a complex with shared and cognate receptors in the presence of different co-receptors. The...
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Wnts in action: from synapse formation to synaptic maintenance.

Ellen M Dickins1, Patricia C Salinas

  • 1Department of Cell and Developmental Biology, University College London London, UK.

Frontiers in Cellular Neuroscience
|November 14, 2013
PubMed
Summary

Proper synapse balance is vital for brain function. Wnt signaling disruption, particularly via Dickkopf-1 (Dkk1), contributes to synapse loss in neurodegenerative diseases like Alzheimer's disease (AD).

Keywords:
DvlFrizzledLTPneurodegenerative diseasesynapse disassemblysynaptic plasticitysynaptogenesis

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Molecular Biology

Background:

  • Synapse assembly and disassembly are critical for neuronal circuit formation and plasticity.
  • Aberrant synaptic disassembly is linked to neurological disorders.
  • Wnt proteins are key regulators of synapse assembly and function.

Purpose of the Study:

  • To review the role of Wnt signaling in synaptic assembly, function, and maintenance.
  • To explore how Wnt signaling dysfunction contributes to synaptic loss in neurodegenerative diseases, specifically Alzheimer's disease (AD).

Main Methods:

  • Review of recent studies on Wnt signaling and synaptic dynamics.
  • Analysis of Dickkopf-1 (Dkk1) as a Wnt antagonist.
  • Examination of Amyloid-ß's role in mediating synaptic loss via Dkk1.

Main Results:

  • Wnt blockade by Dkk1 rapidly disassembles synapses in mature neurons.
  • Dkk1 mediates synaptic loss induced by Amyloid-ß, a key factor in AD.
  • Dysfunctional Wnt signaling is implicated in synaptic loss in neurodegenerative conditions.

Conclusions:

  • Wnt signaling plays a crucial role in maintaining synaptic integrity.
  • Disruption of Wnt signaling, potentially through Dkk1 and Amyloid-ß, contributes to synaptic disassembly in AD.
  • Understanding Wnt signaling pathways offers new therapeutic avenues for neurodegenerative diseases.