Very little is known about the role of melatonin in the trigeminal system, including the function of melatonin receptor 1. In the present study, adult rats were injected with formaldehyde into the right vibrissae pad ...Very little is known about the role of melatonin in the trigeminal system, including the function of melatonin receptor 1. In the present study, adult rats were injected with formaldehyde into the right vibrissae pad to establish a model of orofacial inflammatory pain. The distribution of melatonin re- ceptor 1 and nicotinamide adenine dinucleotide phosphate diaphorase in the caudal spinal trigeminal nucleus and trigeminal ganglion was determined with immunohistochemistry and histo- chemistry. The results show that there are significant differences in melatonin receptor 1 expression and nicotinamide adenine dinucleotide phosphate diaphorase expression in the trigeminal ganglia and caudal spinal nucleus during the early stage of orofacial inflammatory pain. Our findings sug- gest that when melatonin receptor 1 expression in the caudal spinal nucleus is significantly reduced, melatonin＇s regulatory effect on pain is attenuated.展开更多
目的:观察三叉神经根慢性压迫损伤对大鼠三叉神经脊束核尾侧亚核(caudal subnucleus of the spinaltrigeminal nucleus,Vc)内广动力范围(wide dynamic range neurons,WDR)神经元自发放电和诱发放电活动的影响。方法:通过慢性压迫损伤三...目的:观察三叉神经根慢性压迫损伤对大鼠三叉神经脊束核尾侧亚核(caudal subnucleus of the spinaltrigeminal nucleus,Vc)内广动力范围(wide dynamic range neurons,WDR)神经元自发放电和诱发放电活动的影响。方法:通过慢性压迫损伤三叉神经根的方法建立三叉神经痛(TN)动物模型,采用在体细胞外记录技术观察空白对照组和TN模型组大鼠Vc内WDR神经元的自发放电和诱发的放电活动。结果:对照组和TN模型组大鼠Vc内WDR神经元自发放电频率分别为0.84±0.15 Hz和3.18±0.59 Hz;口面部感受野分别给予刷、压、夹机械刺激后,对照组大鼠Vc内WDR神经元的诱发放电频率分别为3.27±1.28 Hz、5.62±0.74 Hz和6.76±1.22 Hz,而TN组大鼠诱发放电频率则分别为7.85±1.57 Hz、10.04±0.72 Hz和12.04±1.77 Hz。结论:TN模型组大鼠Vc内WDR神经元的自发放电频率和诱发放电频率均显著高于对照组大鼠,提示三叉神经根慢性压迫损伤可诱导Vc内WDR神经元兴奋性增强。展开更多
基金supported by the National Natural Science Foundation of China,No.81271166,81371107the Natural Science Foundation of Guangdong Province in China,No.10451008901006145
文摘Very little is known about the role of melatonin in the trigeminal system, including the function of melatonin receptor 1. In the present study, adult rats were injected with formaldehyde into the right vibrissae pad to establish a model of orofacial inflammatory pain. The distribution of melatonin re- ceptor 1 and nicotinamide adenine dinucleotide phosphate diaphorase in the caudal spinal trigeminal nucleus and trigeminal ganglion was determined with immunohistochemistry and histo- chemistry. The results show that there are significant differences in melatonin receptor 1 expression and nicotinamide adenine dinucleotide phosphate diaphorase expression in the trigeminal ganglia and caudal spinal nucleus during the early stage of orofacial inflammatory pain. Our findings sug- gest that when melatonin receptor 1 expression in the caudal spinal nucleus is significantly reduced, melatonin＇s regulatory effect on pain is attenuated.
