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Nociception

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Nociception—the ability to feel pain—is essential for an organism’s survival and overall well-being. Noxious stimuli such as piercing pain from a sharp object, heat from an open flame, or contact with corrosive chemicals are first detected by sensory receptors, called nociceptors, located on nerve endings. Nociceptors express ion channels that convert noxious stimuli into electrical signals. When these signals reach the brain via sensory neurons, they are perceived as pain.

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Local Anesthetics: Differential Sensitivity of Nerve Fibers

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Ligand-Gated Ion Channel Receptor: Gating Mechanism

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Ligand-gated ion channels are transmembrane proteins that play a vital role in intercellular communication and functions of the nervous system. They allow the influx of ions across the membrane once the neurotransmitter binds, allowing the subsequent transmission of electrical excitation across the neurons. Other ligand-gated ion channels, like the γ-aminobutyric acid (GABA) receptor, permit anions like chloride into the cells on the binding of the GABA molecule. Their entry into the cell...

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Kv3.4 channel function and dysfunction in nociceptors.

David M Ritter¹, Benjamin M Zemel, Angelo C Lepore

¹a Department of Neuroscience ; Sidney Kimmel Medical College at Thomas Jefferson University ; Philadelphia , PA USA.

Channels (Austin, Tex.)

|June 4, 2015

Summary

This summary is machine-generated.

Kv3.4 channels regulate neuronal excitability and action potential repolarization in dorsal root ganglion neurons. Their dysregulation after spinal cord injury suggests Kv3.4 channels are potential therapeutic targets for neuropathic pain.

Keywords:

Kv3.4 action potential pain potassium channel spinal cord injury

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Area of Science:

Neuroscience
Ion Channel Physiology
Pain Research

Background:

Kv3.4 channels are critical for action potential repolarization and neuronal excitability in dorsal root ganglion (DRG) neurons.
Previous studies identified Kv3.4 current dysregulation in a spinal cord injury (SCI) model, implicating it in chronic pain.
Kv3.4 channels were suggested as major regulators in female and pup DRG neurons.

Purpose of the Study:

To characterize Kv3.4 current properties in adult male rat DRG neurons.
To investigate the role of Kv3.4 channels in action potential repolarization across different ages and sexes.
To examine Kv3.4 current remodeling following spinal cord injury.

Main Methods:

Electrophysiological recordings of Kv3.4 currents in rat DRG neurons.
Pharmacological and genetic manipulation of Kv3.4 channel function.
Induction of SCI in a rat pain model.
Analysis of action potential repolarization and firing properties.

Main Results:

Kv3.4 current contributes significantly (40-70%) to repolarizing charge during action potentials in DRG neurons across all ages and sexes.
SCI induced remodeling of repolarizing currents, including Kv3.4.
Homomeric Kv3.4 channels are expressed in DRG nociceptors.

Conclusions:

Kv3.4 channels play a conserved and significant role in regulating DRG neuron excitability and action potential dynamics.
SCI-induced changes in Kv3.4 currents contribute to neuropathic pain mechanisms.
Targeting homomeric Kv3.4 channels in DRG nociceptors presents a promising strategy for developing novel neuropathic pain treatments.