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Chronic Post-Ischemia Pain Model for Complex Regional Pain Syndrome Type-I in Rats
Published on: January 21, 2020
Chloride regulation in the pain pathway
Theodore J Price1, Fernando Cervero, Michael S Gold
1University of Arizona, Department of Pharmacology, USA. tjprice@email.arizona.edu
Brain Research Reviews
|January 27, 2009
Summary
Spinal inhibition regulates pain, with anion equilibrium potential (E(anion)) crucial for pain control. Cation-chloride transporters modulate E(anion), impacting hyperalgesia and allodynia, offering therapeutic targets.
Area of Science:
- Neuroscience
- Pain Research
- Cellular Physiology
Background:
- Melzack and Wall's Gate Control Theory proposed spinal inhibition in pain control.
- Mechanisms regulating spinal inhibition are complex, involving anion equilibrium potential (E(anion)).
Purpose of the Study:
- To review the regulation of spinal inhibition via E(anion) and its role in pain.
- To explore therapeutic strategies targeting intracellular chloride gradients and GABA(A) receptors.
Main Methods:
- Review of current scientific literature on spinal inhibition, E(anion), and pain.
- Analysis of the role of cation-chloride co-transporters (NKCC1, KCC2) in regulating E(anion).
Main Results:
- Changes in E(anion) significantly impact fast synaptic inhibition mediated by GABA(A) and glycine receptors.
- Dysregulation of E(anion) by co-transporters is linked to hyperalgesia and allodynia after injury or inflammation.
Conclusions:
- Modulation of intracellular Cl(-) gradients is critical for endogenous pain control.
- Targeting GABA(A) receptors and co-transporters offers potential therapeutic avenues for chronic pain conditions.
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