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Function of a cell adhesion molecule, plexin, in neuron network formation

H Fujisawa1, K Ohta, T Kameyama

  • 1Department of Molecular Biology, School of Science, Nagoya University, Japan.

Developmental Neuroscience
|January 1, 1997
PubMed
Summary
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Plexin, a novel calcium-dependent cell adhesion molecule, facilitates neuronal cell contact and network formation in the Xenopus nervous system through homophilic binding.

Area of Science:

  • Neuroscience
  • Molecular Biology
  • Cell Biology

Background:

  • Plexin is a type I membrane protein identified in the Xenopus nervous system.
  • Its extracellular segment contains cysteine-rich domains homologous to c-met proto-oncogene.
  • Understanding plexin's function is crucial for neurodevelopmental research.

Purpose of the Study:

  • To characterize the function of plexin in cell adhesion and neuronal development.
  • To investigate the binding mechanism and expression patterns of plexin.

Main Methods:

  • Hybridoma technique for plexin identification.
  • Molecular cloning for structural analysis.
  • Cell aggregation assays to study binding properties.
  • Expression analysis in the central and peripheral nervous systems.

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Main Results:

  • Plexin mediates cell adhesion via homophilic binding dependent on calcium ions.
  • Plexin exhibits homology to the cysteine-rich domain of c-met.
  • Expression is localized to neuronal elements in Xenopus CNS and PNS circuits.

Conclusions:

  • Plexin is a novel calcium-dependent cell adhesion molecule.
  • Plexin plays a significant role in neuronal cell-cell contact.
  • The molecule is important for the formation of neuronal networks.