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
Mitochondrial reactive oxygen species(mROS)that are overproduced by mitochondrial dysfunction are linked to pathological conditions including sensory abnormalities.Here,we explored whether mROS overproduction induces ...Mitochondrial reactive oxygen species(mROS)that are overproduced by mitochondrial dysfunction are linked to pathological conditions including sensory abnormalities.Here,we explored whether mROS overproduction induces itch through transient receptor potential canonical 3(TRPC3),which is sensitive to ROS.Intradermal injection of antimycin A(AA),a selective inhibitor of mitochondrial electron transport chain complex III for mROS overproduction,produced robust scratching behavior in naïve mice,which was suppressed by MitoTEMPO,a mitochondria-selective ROS scavenger,and Pyr10,a TRPC3-specific blocker,but not by blockers of TRPA1 or TRPV1.AA activated subsets of trigeminal ganglion neurons and also induced inward currents,which were blocked by MitoTEMPO and Pyr10.Besides,dry skin-induced chronic scratching was relieved by MitoTEMPO and Pyr10,and also by resveratrol,an antioxidant.Taken together,our results suggest that mROS elicit itch through TRPC3,which may underlie chronic itch,representing a potential therapeutic target for chronic itch.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.
基金supported by the National Research Foundation(NRF)funded by the Ministry of Science,ICT&Future Planning(NRF-2018R1A5A2024418 and NRF-2021R1A2C3003334)the Basic Science Research Program through the NRF funded by the Ministry of Education(NRF-2020R1I1A1A01068037).
文摘Mitochondrial reactive oxygen species(mROS)that are overproduced by mitochondrial dysfunction are linked to pathological conditions including sensory abnormalities.Here,we explored whether mROS overproduction induces itch through transient receptor potential canonical 3(TRPC3),which is sensitive to ROS.Intradermal injection of antimycin A(AA),a selective inhibitor of mitochondrial electron transport chain complex III for mROS overproduction,produced robust scratching behavior in naïve mice,which was suppressed by MitoTEMPO,a mitochondria-selective ROS scavenger,and Pyr10,a TRPC3-specific blocker,but not by blockers of TRPA1 or TRPV1.AA activated subsets of trigeminal ganglion neurons and also induced inward currents,which were blocked by MitoTEMPO and Pyr10.Besides,dry skin-induced chronic scratching was relieved by MitoTEMPO and Pyr10,and also by resveratrol,an antioxidant.Taken together,our results suggest that mROS elicit itch through TRPC3,which may underlie chronic itch,representing a potential therapeutic target for chronic itch.
