Abstract:
PURPOSE:The zona incerta (ZI) is below the ventral tier of the thalamus and has a strong influence selectively in higher-order thalamic relays. Although neuropathic pain has been suggested to result from reduced gamma-aminobutyric acid (GABA) and GABAergic signaling in the ZI, the mechanisms remain unclear. Here, the role of GABA and GABAergic signaling was investigated in the ZI in neuropathic pain using sciatic nerve chronic constriction injury (CCI) rats. MATERIALS AND METHODS:Single-unit neuronal activity was recorded, and microdialysis was performed in the ZI of CCI rats and sham-treated rats in vivo. This study also compared ZI neuronal activity after treatment with saline, the GABAA receptor agonist (muscimol), or the GABAA receptor antagonist (bicuculline). RESULTS AND CONCLUSION:CCI rats exhibited hypersensitivity to pain as evidenced by decreased hind paw withdrawal threshold and latency. CCI rats also showed reduced GABA level and decreased neuronal activity in the ZI compared with sham-treated rats. Treatment with GABAA receptor agonist, but not GABAA receptor antagonist, ameliorated pain hypersensitivity and increased the firing rate (spikes/s) of ZI neurons in CCI rats.
journal_name
J Pain Resjournal_title
Journal of pain researchauthors
Moon HC,Park YSdoi
10.2147/JPR.S131104subject
Has Abstractpub_date
2017-05-11 00:00:00pages
1125-1134issn
1178-7090pii
jpr-10-1125journal_volume
10pub_type
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