Electroconvulsive Stimulation (ECS) Increases the Expression of Neuropeptide Y (NPY) in Rat Brains in a Model of Neuropathic Pain: A Quantitative Real-Time Polymerase Chain Reaction (RT-PCR) Study

Tadashi Okabe
Chiyo Sato
Keisuke Matsumoto
Hitoshi Ozawa
Atsuhiro Sakamoto

Objectives. Electroconvulsive shock therapy (ECT) has been widely used as an effective and established treatment for refractory depression and schizophrenia. Some reports have shown that ECT is also effective for treating refractory neuropathic pain.Design. In a rat model of neuropathic pain produced by chronic constrictive injury (CCI) of the sciatic nerve
 thermal hyperalgesia
 and mechanical allodynia were observed from day 2 after surgery. An electroconvulsive shock (ECS) was administered to rodents once daily for 6 days on days 7-12 after CCI operation using a pulse generator. Thermal and mechanical stimulation tests were performed to assess pain thresholds. Real-time polymerase chain reaction was used to measure the gene expression levels for 5HT(1A)R
 5HT(2A)R
 neuropeptide Y (NPY)
 and GABAA(alpha 1)R in the brain.Results. After ECS
 the latency to withdrawal from thermal stimulation was significantly increased; however
 pain withdrawal thresholds in response to mechanical stimulation were not significantly changed. Expression ratios of NPY were significantly greater after ECS.Conclusion. Symptoms of neuropathic pain improved and expression of NPY in the brain was increased in CCI model rats after ECS
 suggesting that changes in the expression of NPY in the brain may be related to the mechanism of action of ECT in treating neuropathic pain.

PAIN MEDICINE

WILEY-BLACKWELL

10

8

10.1111/j.1526-4637.2009.00678.x

https://doi.org/10.1111/j.1526-4637.2009.00678.x
https://www.ncbi.nlm.nih.gov/pubmed/19671088
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