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Bidirectional activity-dependent plasticity at corticostriatal synapses.

Elodie Fino1, Jacques Glowinski, Laurent Venance

  • 1Dynamique et Physiopathologie des Réseaux Neuronaux, Institut National de la Santé et de la Recherche Médicale (INSERM) U-667, Collège de France, 75231 Paris Cedex 05, France.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|December 13, 2005
PubMed
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Researchers demonstrated bidirectional synaptic plasticity at corticostriatal synapses, showing both long-term potentiation (LTP) and depression (LTD) can occur. This plasticity resets synapses, crucial for motor learning and precise timing in the basal ganglia.

Area of Science:

  • Neuroscience
  • Synaptic Plasticity
  • Basal Ganglia Function

Background:

  • Corticostriatal projections are vital for sensorimotor learning and cognition.
  • The precise mechanisms of plasticity at these synapses are not fully understood.

Purpose of the Study:

  • To investigate the induction and properties of synaptic plasticity at corticostriatal connections.
  • To explore the role of timing in plasticity using spike-timing-dependent plasticity (STDP) protocols.

Main Methods:

  • Utilized a corticostriatal slice preparation to maintain connections between the somatosensory cortex and striatal output neurons (SONs).
  • Applied different stimulation patterns (high-frequency trains, low-frequency pulses) to induce long-term potentiation (LTP) and long-term depression (LTD).
  • Investigated spike-timing-dependent plasticity (STDP) by varying the temporal relationship between cortical stimulation and SON activity.

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Main Results:

  • Successfully induced both Hebbian and non-Hebbian forms of LTP and LTD at SONs.
  • Demonstrated that bidirectional plasticity occurs at the same SONs, acting as a homeostatic mechanism to prevent synaptic saturation.
  • Observed an inverted STDP rule compared to other brain structures, with LTP induced by preceding SON activity and LTD by subsequent SON activity.

Conclusions:

  • Corticostriatal synapses exhibit robust bidirectional plasticity, regulated by stimulation patterns and precise timing.
  • The observed homeostatic plasticity is crucial for maintaining synaptic function and preventing saturation.
  • The unique STDP rule in the corticostriatal pathway may underlie the striatum's role in learning temporally organized motor sequences.