The activation of galanin receptor 2 plays an antinociceptive effect in nucleus accumbens of rats with neuropathic pain.

The activation of galanin receptor 2 plays an antinociceptive effect in nucleus accumbens of rats with neuropathic pain.
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甘丙肽受体2的激活在神经病理性疼痛大鼠延髓核中起抗伤害性作用。

DOI:
10.1186/s12576-021-00790-5
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发表时间:
2021-02-05
影响因子:
2.3
通讯作者:
Xu, Shi-Lian
Xu, Shi-Lian
中科院分区:
医学4区
文献类型:
--
作者:
Dong, Yan;Li, Chong-Yang;Zhang, Xiao-Min;Liu, Ya-Nan;Yang, Shuang;Li, Meng-Nan;Xu, Shi-Lian

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我们之前的研究表明,甘丙肽通过与伏隔核(NAc)中的甘丙肽受体(GalRs)结合而发挥抗伤害作用。本研究重点关注 GalR2 在神经病理性疼痛大鼠 NAc 中甘丙肽诱导的镇痛作用中的作用。坐骨神经慢性压迫损伤(CCI)用于模拟神经病理性疼痛模型。测量对热刺激的后爪缩回潜伏期(HWL)和对机械刺激的后爪缩回阈值(HWT)作为疼痛阈值的指标。结果显示,CCI 后 14 天和 28 天,大鼠双侧 NAc 中 GalR2 的表达上调,NAc 内注射 GalR2 拮抗剂 M871 可逆转甘丙肽诱导的 CCI 大鼠 HWL 和 HWT 增加。此外,在 CCI 后第 14 天和第 28 天,NAc 内注射 GalR2 激动剂 M1145 诱导 HWL 和 HWT 增加,这也可以被 M871 逆转。最后,我们发现 M1145 诱导的 CCI 大鼠 NAc 中的镇痛作用强于完整大鼠。这些结果表明,CCI 后第 14 天至第 28 天,NAc 中 GalR2 被激活,并且 GalR2 参与了 CCI 大鼠 NAc 中甘丙肽诱导的镇痛作用。
Our previous research has shown that galanin plays an antinociceptive effect via binding to galanin receptors (GalRs) in nucleus accumbens (NAc). This study focused on the involvement of GalR2 in galanin-induced antinociceptive effect in NAc of neuropathic pain rats. The chronic constriction injury of sciatic nerve (CCI) was used to mimic neuropathic pain model. The hind paw withdrawal latency (HWL) to thermal stimulation and hind paw withdrawal threshold (HWT) to mechanical stimulation were measured as the indicators of pain threshold. The results showed that 14 and 28 days after CCI, the expression of GalR2 was up-regulated in bilateral NAc of rats, and intra-NAc injection of GalR2 antagonist M871 reversed galanin-induced increases in HWL and HWT of CCI rats. Furthermore, intra-NAc injection of GalR2 agonist M1145 induced increases in HWL and HWT at day 14 and day 28 after CCI, which could also be reversed by M871. Finally, we found that M1145-induced antinociceptive effect in NAc of CCI rats was stronger than that in intact rats. These results imply that the GalR2 is activated in the NAc from day 14 to day 28 after CCI and GalR2 is involved in the galanin-induced antinociceptive effect in NAc of CCI rats.
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