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Related Concept Videos

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.
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...
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...
Action Potentials01:41

Action Potentials

Overview
Cardiac Action Potential01:30

Cardiac Action Potential

Cardiac action potentials are essential for proper heart function, enabling the rhythmic contractions needed for adequate blood circulation. Nodal cells and Purkinje fibers, specialized for electrical conduction, generate these action potentials.
The cardiac action potential process involves a series of phases characterized by the movement of ions across the cardiac cell membranes, leading to the depolarization and repolarization of the cardiac myocytes.
Ionic Basis of Cardiac Action Potentials

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Related Experiment Video

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Generation of Local CA1 &#947; Oscillations by Tetanic Stimulation
08:02

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Published on: August 14, 2015

Axon initial segment Ca2+ channels influence action potential generation and timing.

Kevin J Bender1, Laurence O Trussell

  • 1Vollum Institute and Oregon Hearing Research Center, Oregon Health and Science University, Portland, OR 97239, USA. benderke@ohsu.edu

Neuron
|February 3, 2009
PubMed
Summary
This summary is machine-generated.

Voltage-gated calcium channels in the axon initial segment (AIS) are crucial for generating and timing complex action potential bursts. Blocking these channels alters spike timing, threshold, and burst patterns in neurons.

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Area of Science:

  • Neuroscience
  • Cellular Electrophysiology
  • Computational Neuroscience

Background:

  • Action potential generation is primarily attributed to the axon initial segment (AIS).
  • Somatodendritic currents are believed to influence action potential timing and patterns.
  • The specific role of ion channels within the AIS in shaping complex spikes remains under investigation.

Purpose of the Study:

  • To investigate the role of voltage-gated calcium channels (VGCCs) in the AIS of dorsal cochlear nucleus interneurons.
  • To determine the contribution of AIS VGCCs to the generation and timing of complex spikes.
  • To examine the effects of AIS VGCCs on action potential patterns in various neuronal types.

Main Methods:

  • Two-photon imaging was employed to visualize ion channel localization.
  • Selective pharmacological blockade of AIS calcium channels was performed.
  • Electrophysiological recordings were used to analyze action potential generation and timing.

Main Results:

  • T- and R-type VGCCs were found colocalized with sodium channels in the AIS.
  • Blockade of AIS VGCCs significantly delayed spike timing and increased spike threshold during complex spikes.
  • AIS VGCC blockade reduced the number of spikelets in complex spikes and could block simple spikes, with similar effects observed in cortical and cerebellar neurons.

Conclusions:

  • Voltage-gated calcium channels located at the AIS are essential for the generation and precise timing of action potential bursts.
  • These AIS VGCCs play a critical role in shaping neuronal firing patterns, including complex spikes.
  • The findings highlight a previously underappreciated function of VGCCs at the primary site of action potential initiation.