Enhanced AMPAR-dependent synaptic transmission by S-nitrosylation in the vmPFC contributes to chronic inflammatory pain-induced persistent anxiety in mice  

作　　者：Zhi-jin Chen Chun-wan Su Shuai Xiong Ting Li Hai-ying Liang Yu-hui Lin Lei Chang Hai-yin Wu Fei Li Dong-ya Zhu Chun-xia Luo 

机构地区：[1]Department of Pharmacology,School of Pharmacy,Nanjing Medical University,Nanjing 211166,China [2]The First Affiliated Hospital of Fujian Medical University,Longyan 364000,China [3]Guangdong-Hong Kong-Macao Greater Bay Area Center for Brain Science and Brain-Inspired Intelligence,Guangzhou 510515,China [4]Department of Medicinal Chemistry,School of Pharmacy,Nanjing Medical University,Nanjing 211166,China

出　　处：《Acta Pharmacologica Sinica》2023年第5期954-968,共15页中国药理学报（英文版）

基　　金：supported by grants from the National Brain Research Programme of China(2022ZD0211703);National Natural Science Foundation of China(82171293,82090042);Natural Science Foundation of Jiangsu Province(BK20211255);Fujian Province Natural Science Foundation(2021J011433);Fujian Provincial Health Technology Project(2021QNA072).

摘　　要：Chronic pain patients often have anxiety disorders,and some of them suffer from anxiety even after analgesic administration.In this study,we investigated the role of AMPAR-mediated synaptic transmission in the ventromedial prefrontal cortex(vmPFC)in chronic pain-induced persistent anxiety in mice and explored potential drug targets.Chronic inflammatory pain was induced in mice by bilateral injection of complete Freund’s adjuvant(CFA)into the planta of the hind paws;anxiety-like behaviours were assessed with behavioural tests;S-nitrosylation and AMPAR-mediated synaptic transmission were examined using biochemical assays and electrophysiological recordings,respectively.We found that CFA induced persistent upregulation of AMPAR membrane expression and function in the vmPFC of anxious mice but not in the vmPFC of non-anxious mice.The anxious mice exhibited higher S-nitrosylation of stargazin(an AMPAR-interacting protein)in the vmPFC.Inhibition of S-nitrosylation by bilaterally infusing an exogenous stargazin(C302S)mutant into the vmPFC rescued the surface expression of GluA1 and AMPAR-mediated synaptic transmission as well as the anxiety-like behaviours in CFA-injected mice,even after ibuprofen treatment.Moreover,administration of ZL006,a small molecular inhibitor disrupting the interaction of nNOS and PSD-95(20 mg·kg^(−1)·d^(−1),for 5 days,i.p.),significantly reduced nitric oxide production and S-nitrosylation of AMPAR-interacting proteins in the vmPFC,resulting in anxiolytic-like effects in anxious mice after ibuprofen treatment.We conclude that S-nitrosylation is necessary for AMPAR trafficking and function in the vmPFC under chronic inflammatory pain-induced persistent anxiety conditions,and nNOS-PSD-95 inhibitors could be potential anxiolytics specific for chronic inflammatory pain-induced persistent anxiety after analgesic treatment.

关 键 词：chronic pain ANXIETY VMPFC AMPAR trafficking S-NITROSYLATION STARGAZIN 

分 类 号：R589.2[医药卫生—内分泌]