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Related Concept Videos

Integration of Synaptic Events01:28

Integration of Synaptic Events

Synaptic integration mainly includes the summation of graded potentials. Graded potentials, regardless of their type, cause subtle alterations in membrane voltage, resulting in either depolarization or hyperpolarization. These incremental changes, when combined or summed, can propel the neuron toward its threshold. Consider, for example, a membrane experiencing a +15 mV shift, causing it to depolarize from -70 mV to -55 mV. In this scenario, graded potentials govern the membrane's ability to...
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Long-term Potentiation

Long-term potentiation, or LTP, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTP is the process of synaptic strengthening that occurs over time between pre and postsynaptic neuronal connections. The synaptic strengthening of LTP works in opposition to the synaptic weakening of long-term depression (LTD) and together are the main mechanisms that underlie learning and memory.
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Long-term potentiation, or LTP, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTP is the process of synaptic strengthening that occurs over time between pre- and postsynaptic neuronal connections. The synaptic strengthening of LTP works in opposition to the synaptic weakening of long-term depression (LTD) and together are the main mechanisms that underlie learning and memory.

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Updated: Jun 10, 2026

Inhibitory Synapse Formation in a Co-culture Model Incorporating GABAergic Medium Spiny Neurons and HEK293 Cells Stably Expressing GABAA Receptors
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Temporal coding at the immature depolarizing GABAergic synapse.

Guzel Valeeva1, Azat Abdullin, Roman Tyzio

  • 1Institut de Neurobiologie de la Méditerranée-Institut National de la Santé et de la Recherche Médicale U901, Universite Mediterranean Aix-Marseille II Marseille, France.

Frontiers in Cellular Neuroscience
|August 21, 2010
PubMed
Summary
This summary is machine-generated.

In developing rat hippocampus, GABAergic excitation is slow and variable, requiring sodium channel amplification for action potential initiation. This impacts neuronal network synchronization and giant depolarizing potential propagation.

Keywords:
developmentgamma aminobutyric acidhippocampusneonatal

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Area of Science:

  • Neuroscience
  • Developmental Neuroscience
  • Synaptic Plasticity

Background:

  • GABAergic transmission in the developing hippocampus is excitatory, driving network activity like giant depolarizing potentials (GDPs).
  • Understanding spike timing at these immature synapses is crucial for comprehending early network development and function.

Purpose of the Study:

  • To investigate spike time coding at immature GABAergic synapses in neonatal rat hippocampus.
  • To determine the impact of GABAergic synaptic transmission on neuronal network synchronization during GDPs.

Main Methods:

  • Extracellular field recordings in neonatal rat hippocampal slices (postnatal days P2-6).
  • Whole-cell patch-clamp recordings to analyze GABAergic responses and action potential (AP) initiation.
  • Pharmacological manipulation of GABA reversal potential (E(GABA)) and GABA(A) receptor activity (bumetanide, diazepam, bicuculline).

Main Results:

  • Synaptic activation of GABA(A) receptors evoked long (mean 65 ms) and variable AP delays.
  • GABAergic responses were often subthreshold, requiring amplification by persistent sodium conductance for AP firing.
  • Increased intracellular chloride concentration shortened and reduced variability of AP delays.
  • Modulation of E(GABA) and GABA(A) receptor activity altered GDPs amplitude, neuronal synchrony, and propagation speed.

Conclusions:

  • Spike timing at depolarizing GABAergic synapses is primarily determined by intracellular chloride concentration.
  • In the developing hippocampus, GABAergic depolarization alone is insufficient to trigger action potentials; sodium conductance amplification is essential.
  • The slow and variable nature of GABAergic excitation shapes neuronal synchrony and GDP propagation rates, influencing early network formation.