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Related Concept Videos

Graded Potential01:19

Graded Potential

Graded potentials are localized fluctuations in the cell membrane's electrical charge, commonly found in the dendrites of neurons. The magnitude of these potential changes depends on the strength of the initiating stimulus. In a membrane at its resting potential, a graded potential signifies a voltage shift either above -70 mV or below -70 mV.
Graded potentials fall into two categories: depolarizing and hyperpolarizing. Depolarizing graded potentials typically occur when sodium (Na+) or calcium...
Action Potentials01:41

Action Potentials

Overview
Action Potential: Phases of Stimulation01:28

Action Potential: Phases of Stimulation

The action potential is a complex electrical event that occurs in excitable cells, such as neurons and muscle cells. It consists of several distinct phases, each with specific characteristics.
Resting Phase:
In this phase, the cell's membrane is at its resting potential, typically around -70 millivolts (mV) for neurons. Inside the cell, there is a higher concentration of potassium ions (K+) and a lower concentration of sodium ions (Na+). Voltage-gated sodium channels are closed, and...
Action Potential01:14

Action Potential

Neurons communicate by firing action potentials—the electrochemical signal that is propagated along the axon. The signal results in the release of neurotransmitters at axon terminals, thereby transmitting information to the nervous system. An action potential is a specific "all-or-none" change in membrane potential that results in a rapid spike in voltage.
Membrane potential in neurons
Neurons typically have a resting membrane potential of about -70 millivolts (mV). When they receive...

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Recording Gamma Band Oscillations in Pedunculopontine Nucleus Neurons
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Giant spontaneous depolarizing potentials in the developing thalamic reticular nucleus.

Susanne Pangratz-Fuehrer1, Uwe Rudolph, John R Huguenard

  • 1Department of Neurology and Neurological Sciences, Stanford University School of Medicine, Stanford, CA 94305, USA.

Journal of Neurophysiology
|January 26, 2007
PubMed
Summary

Thalamic giant depolarizing potentials (tGDPs) in the thalamic reticular nucleus (nRt) are mediated by GABA(A) receptors containing the alpha5 subunit during early development. These GABAergic responses may influence the development of thalamo-cortical circuits.

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Area of Science:

  • Neuroscience
  • Developmental Neuroscience
  • Synaptic Plasticity

Background:

  • The thalamic reticular nucleus (nRt) is crucial for thalamo-cortical circuit function and spindle oscillation generation.
  • Early developmental stages involve unique synaptic mechanisms that shape neural circuits.

Purpose of the Study:

  • To characterize thalamic giant depolarizing potentials (tGDPs) in the developing nRt.
  • To identify the specific GABA receptors mediating tGDPs and their developmental role.

Main Methods:

  • Electrophysiological recordings in developing mouse nRt neurons.
  • Pharmacological manipulation using GABA(A) receptor antagonists and benzodiazepines.
  • Utilizing genetically modified mice with altered GABA receptor subunits (alpha3(H126R)).

Main Results:

  • tGDPs were observed in nRt neurons between postnatal days 3-8, lasting 0.4-3 seconds.
  • tGDPs were abolished by GABA(A) receptor antagonists but not ionotropic glutamate antagonists.
  • Data from alpha3(H126R) mice suggested that GABA(A) receptors containing the alpha5 subunit mediate tGDPs.
  • Elevated intracellular chloride in young nRt neurons led to depolarizing GABAergic responses.

Conclusions:

  • Developing nRt neurons exhibit unique depolarizing GABAergic potentials (tGDPs) mediated by alpha5 subunit-containing GABA(A) receptors.
  • These tGDPs, occurring during a critical developmental window, may contribute to calcium influx and the functional maturation of spindle-generating circuits.