Galanin plays a role in antinociception via binding to galanin receptors in the nucleus accumbens of rats with neuropathic pain

• Published in: Neuroscience letters 2019-07, Vol.706, p.93-98
• Main Authors: Zhang, Ying, Gao, Yi, Li, Chong-Yang, Dong, Wei, Li, Meng-Nan, Liu, Ya-Nan, Dong, Yan, Xu, Shi-Lian
• Format: Article
• Language: English
• Subjects: Animals; Antinociception; Disease Models, Animal; Dose-Response Relationship, Drug; Galanin; Galanin - pharmacology; Galanin - therapeutic use; Galanin receptors; Male; Neuralgia - drug therapy; Neuralgia - metabolism; Neurons - drug effects; Neurons - metabolism; Neuropathic pain; Nociception - drug effects; Nucleus accumbens; Nucleus Accumbens - drug effects; Nucleus Accumbens - metabolism; Pain Measurement; Physical Stimulation; Rats; Rats, Sprague-Dawley; Receptors, Galanin - metabolism
• ISSN: 0304-3940; 1872-7972
• DOI: 10.1016/j.neulet.2019.05.016

•NAc galanin has stronger antinociception in neuralgic rats than that in intact rats.•Galanin expression is upregulated in the NAc of rats with neuropathic pain.•Endogenous galanin has antinociception via binding to GalRs in NAc of neuralgic rats. Galanin and galanin receptors (GalRs) play important roles in the transmission and modulation of nociceptive information. Our previous research has shown that the expression of GalR1 is upregulated and that GalR1 activation in the nucleus accumbens (NAc) of rats with neuropathic pain has an antinociceptive effect. However, the antinociceptive effect of NAc galanin in neuralgia remains unclear. The present study aimed to explore the antinociceptive effect induced by galanin in rats with neuropathic pain and the underlying mechanism. The results showed that the intra-NAc injection of galanin induced a dose-dependent increase in hindpaw withdrawal latency (HWL) to noxious thermal and mechanical stimulation in mononeuropathic rats and that this effect was stronger than that in intact rats. The intra-NAc injection of the non-selective GalR antagonist galantide reduced HWL in the rats with neuropathic pain, but there was no influence of galantide on HWL in intact rats. Moreover, galanin expression in the NAc was upregulated after sciatic nerve ligation. All of these results demonstrate that galanin plays a role in antinociception via binding to GalRs in the NAc of rats and that endogenous galanin is involved in the antinociception after peripheral nerve injury.