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Related Experiment Video

Updated: May 5, 2026

Preparation of Peripheral Nerve Stimulation Electrodes for Chronic Implantation in Rats
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Kv2 dysfunction after peripheral axotomy enhances sensory neuron responsiveness to sustained input.

Christoforos Tsantoulas1, Lan Zhu1, Ping Yip2

  • 1Neurorestoration Group, Wolfson Centre for Age-Related Diseases, King's College London, London SE1 1UL, UK.

Experimental Neurology
|November 21, 2013
PubMed
Summary

Peripheral nerve injury causes chronic pain by increasing sensory neuron excitability. Kv2 channel dysfunction contributes to this hyperexcitability, suggesting Kv2 channels limit neuronal excitability and may be a therapeutic target.

Keywords:
AHPD50APAP half widthAPD50ATF3CGRPCNSDRGDorsal root gangliaGAPDHIB4IHCIRISHKv channelNF200Neuropathic painPotassium channelRPSNTScTxaction potentialactivating transcription factor 3after-hyperpolarization half widthcalcitonin gene-related peptidecentral nervous systemdorsal root ganglionglyceraldehyde 3-phosphate dehydrogenaseimmunohistochemistryin situ hybridizationinput resistanceisolectin B4neurofilament 200refractory periodspinal nerve transectionstromatoxin-1voltage-gated potassium channel

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Pain Research

Background:

  • Peripheral nerve injuries often lead to chronic pain due to increased sensory neuron excitability.
  • Alterations in ion channel function are implicated in the pathophysiology of these pain states.
  • Kv2 family channels are crucial regulators of neuronal excitability.

Purpose of the Study:

  • To characterize the mRNA distribution of Kv2 family members in rat dorsal root ganglia (DRG).
  • To investigate the link between Kv2 function and sensory neuron excitability following nerve injury.
  • To explore the role of Kv2 dysfunction in the generation of chronic pain phenotypes.

Main Methods:

  • Quantification of Kv2.1 and Kv2.2 mRNA expression in rat DRG.
  • Induction of peripheral axotomy and assessment of mechanical and thermal hypersensitivity.
  • Intracellular recordings in ex vivo DRG preparations to assess action potential properties and Kv2 function using stromatoxin-1 (ScTx).

Main Results:

  • Kv2.1 and Kv2.2 were widely expressed in DRG neurons, particularly in medium-large neurons.
  • Peripheral axotomy caused a rapid, robust, and long-lasting downregulation of Kv2 mRNA in DRG, correlating with hypersensitivity.
  • Kv2 inhibition shortened action potential after-hyperpolarization and refractory period in naïve neurons, but not in axotomized neurons, indicating Kv2 loss-of-function contributes to hyperexcitability.

Conclusions:

  • Kv2 downregulation following nerve injury contributes to sensory neuron hyperexcitability and chronic pain.
  • Normal Kv2 function appears to limit neuronal excitability, suggesting Kv2 channels are key players in pain pathophysiology.
  • Kv2 dysfunction is a significant factor in the development of hyperexcitable phenotypes associated with chronic pain states.