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Related Concept Videos

Neural Circuits01:25

Neural Circuits

Neural circuits and neuronal pools are two of the main structures found in the nervous system. Neural circuits are networks of neurons that work together to carry out a specific task or process. They consist of interconnected neurons and glial cells, which provide structural and metabolic support.
Neuronal pools are collections of nerve cells with similar functions and interact through chemical and electrical signals. These pools include both interneurons (the central neural circuit nodes that...
Postsynaptic Potential (PSP)01:32

Postsynaptic Potential (PSP)

Postsynaptic potential (PSP) refers to a change in the electrical potential of a neuron when neurotransmitters released by presynaptic neurons bind to postsynaptic receptors. This potential can either be excitatory, leading to depolarization and ultimately action potential generation, or inhibitory, leading to hyperpolarization and suppression of the postsynaptic neuron.
There are two types of receptors: ionotropic and metabotropic.
The ionotropic receptor is the membrane protein that has an...
The Role of Ion Channels in Neuronal Computation01:19

The Role of Ion Channels in Neuronal Computation

A postsynaptic neuron usually receives numerous impulses from several other presynaptic neurons. The axon hillock of the postsynaptic neuron integrates all these signals and determines the likelihood of firing an action potential.
Sometimes a single EPSP is strong enough to induce an action potential in the postsynaptic neuron. However, multiple presynaptic inputs must often create EPSPs around the same time for the postsynaptic neuron to be sufficiently depolarized to fire an action potential.
Chemical Synapses01:26

Chemical Synapses

Chemical synapses are specialized sites between two neurons or between a neuron and a non-neuronal cell like a muscle, glandular or sensory cell.
Because chemical synapses depend on the release of neurotransmitter molecules from synaptic vesicles to pass on their signal, there is an approximately one millisecond delay between when the axon potential reaches the presynaptic terminal and when the neurotransmitter leads to opening of postsynaptic ion channels. Additionally, this signaling is...
Chemical Synapses01:26

Chemical Synapses

Chemical synapses are specialized sites between two neurons or between a neuron and a non-neuronal cell like a muscle, glandular or sensory cell.
Because chemical synapses depend on the release of neurotransmitter molecules from synaptic vesicles to pass on their signal, there is an approximately one millisecond delay between when the axon potential reaches the presynaptic terminal and when the neurotransmitter leads to opening of postsynaptic ion channels. Additionally, this signaling is...
Excitatory and Inhibitory Effects of Neurotransmitters01:29

Excitatory and Inhibitory Effects of Neurotransmitters

When an action potential reaches the presynaptic axon terminal, it releases neurotransmitters from the neuron into the synaptic cleft at a chemical synapse. The released neurotransmitter can be excitatory or inhibitory. The critical criteria commonly used to determine whether a molecule is a neurotransmitter at a chemical synapse are the molecule's presence in the presynaptic neuron. Second, its release is in response to strong presynaptic depolarization. And lastly, the presence of specific...

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Related Experiment Video

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Double In Utero Electroporation to Target Temporally and Spatially Separated Cell Populations
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Postsynaptically different inhibitory postsynaptic currents in Cajal-Retzius cells in the developing neocortex.

Anton Dvorzhak1, Olga Myakhar, Andre Kamkin

  • 1Institute of Neurophysiology, Johannes-Mueller-Center of Physiology, Charité-University-Medicine Berlin, Berlin, Germany.

Neuroreport
|July 17, 2008
PubMed
Summary
This summary is machine-generated.

Zolpidem differentiated inhibitory postsynaptic currents (IPSCs) in neocortical cells. Fast IPSCs involve alpha2/3-containing GABA-A receptors, while slow IPSCs involve alpha1 and alpha2/3 subtypes, differing in GABA release saturation.

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Electrophysiological Investigations of Retinogeniculate and Corticogeniculate Synapse Function
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Area of Science:

  • Neuroscience
  • Cellular Neuroscience
  • Synaptic Plasticity

Background:

  • Neocortical Cajal-Retzius cells exhibit fast and slow inhibitory postsynaptic currents (IPSCs).
  • Gamma-aminobutyric acid type A receptors (GABAARs) are crucial for inhibitory neurotransmission.
  • Benzodiazepine agonists like zolpidem selectively modulate specific GABAAR subtypes.

Purpose of the Study:

  • To characterize the GABAAR subtypes mediating fast (IPSCF) and slow (IPSCs) inhibitory postsynaptic currents in neocortical Cajal-Retzius cells.
  • To investigate the role of GABAAR subunit composition in synaptic GABA release saturation.

Main Methods:

  • Application of zolpidem, a selective GABAAR agonist, at different concentrations (100 nM and 2 μM).
  • Electrophysiological recordings of evoked (eIPSCs) and miniature (mIPSCs) inhibitory postsynaptic currents.
  • Analysis of IPSC kinetics, amplitude, and paired-pulse ratio (PPR) to infer receptor properties and presynaptic release dynamics.

Main Results:

  • 100 nM zolpidem prolonged IPSCS, increased eIPCS amplitude, and decreased eIPCS PPR.
  • 2 μM zolpidem prolonged both IPSCF and IPSCS, increased mIPSCF and eIPSCF amplitudes, increased eIPCS amplitude, and decreased eIPCS PPR.
  • 2 μM zolpidem did not affect the PPR of eIPSCF, suggesting different presynaptic release characteristics.

Conclusions:

  • IPSCF are mediated by alpha2/3-containing GABAARs, which are not saturated by synaptic GABA release.
  • IPSCs are mediated by alpha1-containing and alpha2/3-containing GABAARs, which are saturated by quantal GABA release.
  • Differential GABAAR subunit composition underlies distinct inhibitory current kinetics and presynaptic release properties in Cajal-Retzius cells.