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Zinc dynamics and action at excitatory synapses.

Angela Maria Vergnano1, Nelson Rebola2, Leonid P Savtchenko3

  • 1Ecole Normale Supérieure, Institut de Biologie de l'ENS (IBENS), F-75005 Paris, France; Inserm, U1024, F-75005 Paris, France; CNRS, UMR 8197, F-75005 Paris, France.

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Ionic zinc, present in synaptic vesicles, is released during neural activity. This zinc transiently inhibits specific NMDA receptors (NMDARs), regulating excitatory neurotransmission and synaptic plasticity across brain circuits.

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Area of Science:

  • Neuroscience
  • Synaptic Physiology
  • Molecular Biology

Background:

  • Ionic zinc is abundant in glutamatergic synaptic vesicles.
  • The precise dynamics and function of synaptic zinc release remain poorly understood.
  • Extracellular zinc's role in modulating NMDA receptor (NMDAR) activity is a key area of investigation.

Purpose of the Study:

  • To quantitatively assess zinc dynamics in the synaptic cleft.
  • To clarify the role of zinc in regulating excitatory neurotransmission.
  • To investigate zinc's impact on synaptic integration and plasticity.

Main Methods:

  • Synaptic recordings in mice with altered zinc signaling.
  • Monte Carlo simulations of zinc dynamics.
  • Electrophysiological analysis of NMDAR function.

Main Results:

  • Ambient extracellular zinc is insufficient for tonic NMDAR inhibition.
  • Physiologically relevant stimuli cause transient synaptic zinc increases.
  • Zinc selectively inhibits postsynaptic GluN2A-containing NMDARs.
  • This inhibition alters synaptic integration and plasticity.

Conclusions:

  • Zinc acts as a widespread, activity-dependent regulator of neuronal circuits.
  • Zinc modulation of excitatory neurotransmission extends beyond hippocampal mossy fibers to SC-CA1 synapses.
  • The study establishes clear rules for zinc's action in synaptic function.