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Neurotrophins regulate agrin-induced postsynaptic differentiation

D G Wells1, B A McKechnie, S Kelkar

  • 1Department of Neuroscience, Brown University, Providence, RI 02912, USA.

Proceedings of the National Academy of Sciences of the United States of America
|February 3, 1999
PubMed
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Neurotrophins like BDNF and NT-4 inhibit acetylcholine receptor (AChR) clustering at nerve-muscle synapses. This suggests neurotrophins and agrin interact to regulate synapse formation and postsynaptic specialization.

Area of Science:

  • Neuroscience
  • Cell Biology
  • Synaptic Plasticity

Background:

  • Synaptic differentiation is crucial for nervous system function.
  • Agrin orchestrates nerve-muscle synapse formation by clustering acetylcholine receptors (AChRs).
  • Additional factors likely regulate the plasticity of neuromuscular junctions.

Purpose of the Study:

  • To investigate if neurotrophins influence agrin-induced postsynaptic differentiation.
  • To elucidate the role of neurotrophins in regulating AChR clustering at the neuromuscular junction.

Main Methods:

  • Cultured myotubes treated with agrin, BDNF, NT-4, NGF, NT-3.
  • Assessment of AChR clustering.
  • Analysis of TrkB receptor expression and activation using anti-TrkB antibodies.

Related Experiment Videos

  • Neutralization of endogenous TrkB ligands.
  • High-concentration agrin treatments.

    • Main Results:

    • BDNF and NT-4 significantly inhibited agrin-induced AChR clustering.
    • Nerve growth factor and NT-3 had no effect on AChR clustering.
    • Muscle cells express functional TrkB receptors, mediating the inhibitory effect.
    • Blocking TrkB signaling increased AChR clustering, even without agrin.
    • High agrin concentrations could overcome BDNF/NT-4 inhibition.

    Conclusions:

    • An interaction between agrin and neurotrophins (BDNF, NT-4) regulates postsynaptic specialization formation.
    • Neurotrophin signaling via TrkB provides an intrinsic mechanism to control AChR clustering.
    • This interplay may suppress postsynaptic differentiation in non-synaptic regions.