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SynCAM, a synaptic adhesion molecule that drives synapse assembly

Thomas Biederer1, Yildirim Sara, Marina Mozhayeva

  • 1Center for Basic Neuroscience, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA. Thomas.Biederer@UTSouthwestern.edu

Science (New York, N.Y.)
|August 31, 2002
PubMed

Insights

SynCAM, a brain-specific protein, acts as a cell adhesion molecule essential for synapse formation. Its expression in nonneuronal cells induced synapse assembly, demonstrating its crucial role in neuronal communication.

Area of Science:

  • Neuroscience
  • Cell Biology
  • Molecular Biology

Background:

  • Synapses are crucial for neuronal communication, involving complex pre- and postsynaptic assembly.
  • Understanding the molecular mechanisms of synapse formation is key to neuroscience research.

Purpose of the Study:

  • To investigate the role of SynCAM, a brain-specific protein, in synapse formation and function.
  • To determine if SynCAM acts as a cell adhesion molecule at the synapse.

Main Methods:

  • Studied SynCAM, an immunoglobulin domain-containing protein.
  • Examined SynCAM's interaction with intracellular PDZ-domain proteins.
  • Assessed the effects of SynCAM expression (full-length and cytoplasmic tail) on synapse assembly in neuronal and nonneuronal cells.
  • Reconstituted glutamatergic synaptic transmission in nonneuronal cells.

Main Results:

  • SynCAM functions as a homophilic cell adhesion molecule at the synapse.
  • Expression of the SynCAM cytoplasmic tail inhibited synapse assembly in neurons.
  • Full-length SynCAM expression in nonneuronal cells induced synapse formation by cocultured hippocampal neurons.
  • Functional glutamatergic synaptic transmission was achieved by coexpressing glutamate receptors with SynCAM in nonneuronal cells.

Conclusions:

  • SynCAM is a key mediator of synapse assembly and function.
  • A single adhesion molecule (SynCAM) and receptor (glutamate receptor) can be sufficient for a functional postsynaptic response.
  • SynCAM plays a vital role in establishing synaptic connections in the brain.

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