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Rapid BDNF-induced retrograde synaptic modification in a developing retinotectal system.

Jiu-Lin Du1, Mu-Ming Poo

  • 1Division of Neurobiology, Department of Molecular and Cell Biology, Helen Wills Neuroscience Institute, University of California, Berkeley, California 94720, USA.

Nature
|June 25, 2004
PubMed
Summary
This summary is machine-generated.

Rapid retrograde synaptic modification was observed in the developing Xenopus retinotectal system. Brain-derived neurotrophic factor (BDNF) induced changes in retinal ganglion cells (RGCs) via TrkB receptors, enhancing synaptic plasticity.

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Area of Science:

  • Neuroscience
  • Synaptic Plasticity
  • Developmental Biology

Background:

  • Long-term synaptic potentiation/depression in hippocampal neurons involves retrograde signaling from axon terminals to dendrites.
  • Understanding retrograde signaling in intact developing systems is crucial for comprehending neural circuit formation.

Purpose of the Study:

  • To investigate the existence and mechanisms of rapid retrograde synaptic modification in the developing Xenopus laevis retinotectal system.
  • To determine the molecular players and cellular processes involved in this retrograde signaling.

Main Methods:

  • Local application of brain-derived neurotrophic factor (BDNF) to the optic tectum of Xenopus laevis.
  • Electrophysiological recordings of light-evoked excitatory synaptic currents and spiking activity in retinal ganglion cells (RGCs).
  • Pharmacological inhibition of TrkB receptor activation, phospholipase Cgamma activity, and intracellular calcium elevation.

Main Results:

  • BDNF application induced persistent potentiation of retinotectal synapses.
  • This potentiation resulted in rapid modification of synaptic inputs at RGC dendrites, enhancing synaptic currents and spiking activity.
  • The retrograde effect was dependent on TrkB receptor activation, phospholipase Cgamma activity, and Ca2+ elevation in RGCs.
  • The mechanism involved a selective increase in postsynaptic AMPA-subtype glutamate receptors at RGC dendrites.

Conclusions:

  • Rapid retrograde synaptic modification occurs in the developing Xenopus retinotectal system.
  • This process is mediated by BDNF signaling through TrkB receptors, involving phospholipase Cgamma and Ca2+ in RGCs.
  • Retrograde information flow allows for rapid regulation of synaptic inputs based on signals at axon terminals, analogous to neural network learning algorithms.