title: Decreased expression and role of GRK6 in spinal cord of rats after chronic constriction injury.
abstract: Nerve injury and inflammation can both induce neuropathic pain via the production of pro-inflammatory cytokines. In the process, G protein-coupled receptors (GPCRs) were involved in pain signal transduction. GPCR kinase (GRK) 6 is a member of the GRK family that regulates agonist-induced desensitization and signaling of GPCRs. However, its expression and function in neuropathic pain have not been reported. In this study, we performed a chronic constriction injury (CCI) model in adult male rats and investigated the dynamic change of GRK6 expression in spinal cord. GRK6 was predominantly expressed in the superficial layers of the lumbar spinal cord dorsal horn neurons and its expression was decreased bilaterally following induction of CCI. The changes of GRK6 were mainly in IB4 and P substrate positive areas in spinal cord dorsal horn. And over-expression of GRK6 in spinal cord by lentivirus intrathecal injection attenuated the pain response induced by CCI. In addition, the level of TNF-α underwent the negative pattern of GRK6 in spinal cord. And neutralized TNF-α by antibody intrathecal injection up-regulated GRK6 expression and attenuated the mechanical allodynia and heat hyperalgesia in CCI model. All the data indicated that down-regulation of neuronal GRK6 expression induced by cytokine may be a potential mechanism that contributes to increasing neuronal signaling in neuropathic pain.
authors: Department of Anesthesiology, Affiliated Hospital of Nantong University, Nantong, 226001, Jiangsu, People's Republic of China.
authors: Yuan
authors: Y
authors: Zhou
authors: Xiaodong
authors: X
authors: Huang
authors: Hao
authors: H
authors: Wu
authors: Yue
authors: Y
authors: Xu
authors: Tao
authors: T
authors: Tao
authors: Guangfei
authors: G
authors: Xu
authors: Chun
authors: C
authors: Cheng
authors: Su
authors: S
authors: Cao
mesh_terms: D000818:Animals; D003250:Constriction; D054768:G-Protein-Coupled Receptor Kinases / Q000096:biosynthesis / Q000502:physiology*; D006930:Hyperalgesia / Q000503:physiopathology; D008297:Male; D009437:Neuralgia / Q000201:enzymology* / Q000503:physiopathology; D020671:Posterior Horn Cells / Q000201:enzymology; D051381:Rats; D017207:Rats, Sprague-Dawley; D015398:Signal Transduction / Q000235:genetics; D013116:Spinal Cord / Q000378:metabolism / Q000503:physiopathology; D013119:Spinal Cord Injuries / Q000201:enzymology*; D014409:Tumor Necrosis Factor-alpha / Q000276:immunology
chemical_list: D014409:Tumor Necrosis Factor-alpha; D054768:G-Protein-Coupled Receptor Kinases; C089176:G-protein-coupled receptor kinase 6
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