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The Relationship Between Glutamate Dynamics and Activity-Dependent Synaptic Plasticity.

Jocelyn R Barnes1, Bandhan Mukherjee1, Ben C Rogers1

  • 1Division of Biomedical Sciences, Faculty of Medicine, Memorial University, St. John's, Newfoundland A1B 3V6, Canada.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|February 28, 2020
PubMed
Summary
This summary is machine-generated.

Impaired glutamate uptake negatively impacts synaptic plasticity and memory formation. This study reveals how excess glutamate disrupts long-term potentiation (LTP) and identifies key mechanisms relevant to neurodegenerative diseases.

Keywords:
VGCCscalcium imagingglutamate transporteriGluSnFRlong-term potentiationsynaptic plasticity

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Area of Science:

  • Neuroscience
  • Synaptic Plasticity
  • Glutamatergic Neurotransmission

Background:

  • Efficient synaptic communication relies on regulated spatiotemporal dynamics of excitatory neurotransmission.
  • Glutamate transporters limit spillover, preventing excessive extrasynaptic receptor activation that impairs synaptic plasticity.
  • Transporter dysfunction is implicated in neurodegenerative diseases, but its precise role in pathophysiology is unclear.

Purpose of the Study:

  • To investigate the relationship between glutamate dynamics during theta burst stimulation (TBS) and long-term potentiation (LTP) magnitude.
  • To characterize the impact of selective and nonselective glutamate transporter blockade on LTP consolidation.
  • To elucidate the mechanisms linking altered glutamate uptake to impaired synaptic plasticity.

Main Methods:

  • Combined electrophysiology and real-time high-speed imaging of extracellular glutamate transients during LTP induction.
  • Selective and nonselective blockade of glutamate transporters.
  • Analysis of postsynaptic population responses and intracellular calcium dynamics.

Main Results:

  • Nonselective glutamate transporter inhibition correlated with reduced LTP magnitude, unlike selective GLT-1 blockade.
  • Glutamate transporter inhibition exaggerated TBS-induced calcium responses, dependent on NMDARs, L-type VGCCs, GluA2-lacking AMPARs, and internal stores.
  • Inhibition of L-type VGCCs, but not GluA2-lacking AMPARs or ryanodine receptors, restored robust LTP.

Conclusions:

  • Altered glutamate dynamics significantly impact LTP consolidation, with implications for learning and memory.
  • Excess extracellular glutamate negatively influences synaptic plasticity through specific calcium signaling pathways.
  • Findings offer insights into the role of glutamate transporter dysfunction in neurodegenerative diseases and brain aging.