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Bead Aggregation Assays for the Characterization of Putative Cell Adhesion Molecules
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N-cadherin prodomain processing regulates synaptogenesis.

Analía Reinés1, Louis-Philippe Bernier, Robyn McAdam

  • 1The Montreal Neurological Institute and Hospital, McGill University, Montreal, Quebec H3A 2B4, Canada. areines@ffyb.uba.ar

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|May 4, 2012
PubMed
Summary
This summary is machine-generated.

The ratio of precursor N-cadherin (ProN) to mature N-cadherin (N-cad) on neuronal surfaces regulates synapse formation. High ProN levels impair synapse development, highlighting ProN

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Molecular Neuroscience

Background:

  • Classical cadherins are crucial adhesion molecules at the central nervous system (CNS) synapse.
  • Cadherins are synthesized as inactive precursors requiring cleavage for adhesive function.
  • The endoplasmic reticulum (ER) and Golgi apparatus are key sites for cadherin maturation.

Purpose of the Study:

  • To investigate the surface localization and function of nonadhesive precursor N-cadherin (ProN).
  • To determine the role of the ProN/N-cadherin ratio in regulating synaptogenesis.
  • To explore the developmental regulation of prodomain processing in the rat hippocampus.

Main Methods:

  • Cultured hippocampal neurons were used to study N-cadherin localization and function.
  • Genetically engineered uncleavable ProN was expressed to assess its impact on synapse formation.
  • Exogenous protease treatment was employed to cleave surface ProN and evaluate rescue effects.

Main Results:

  • Nonadhesive precursor N-cadherin (ProN) is sorted to the neuronal surface alongside mature N-cadherin (N-cad).
  • A high ProN/N-cad ratio significantly downregulates synapse formation in cultured hippocampal neurons.
  • Cleavage of ProN by exogenous protease rescues synapse number, confirming ProN's inhibitory role.

Conclusions:

  • The ratio of ProN to N-cad, not solely mature N-cad, is critical for regulating adhesion during synaptogenesis.
  • Surface-localized ProN acts as a negative regulator of synapse formation.
  • Prodomain processing of N-cadherin is developmentally controlled in the brain.