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Inhibition of Mammalian Target of Rapamycin (mTOR) Signaling in the Insular Cortex Alleviates Neuropathic Pain after Peripheral Nerve Injury

Authors
 Minjee Kwon  ;  Jeongsoo Han  ;  Un Jeng Kim  ;  Myeounghoon Cha  ;  Sun Woo Um  ;  Sun Joon Bai  ;  Seong-Karp Hong  ;  Bae Hwan Lee 
Citation
 FRONTIERS IN MOLECULAR NEUROSCIENCE, Vol.10 : 79, 2017 
Journal Title
 FRONTIERS IN MOLECULAR NEUROSCIENCE 
Issue Date
2017
Keywords
insular cortex ; mTOR ; neuropathic pain ; rapamycin ; synaptic plasticity
Abstract
Injury of peripheral nerves can trigger neuropathic pain, producing allodynia and hyperalgesia via peripheral and central sensitization. Recent studies have focused on the role of the insular cortex (IC) in neuropathic pain. Because the IC is thought to store pain-related memories, translational regulation in this structure may reveal novel targets for controlling chronic pain. Signaling via mammalian target of rapamycin (mTOR), which is known to control mRNA translation and influence synaptic plasticity, has been studied at the spinal level in neuropathic pain, but its role in the IC under these conditions remains elusive. Therefore, this study was conducted to determine the role of mTOR signaling in neuropathic pain and to assess the potential therapeutic effects of rapamycin, an inhibitor of mTORC1, in the IC of rats with neuropathic pain. Mechanical allodynia was assessed in adult male Sprague-Dawley rats after neuropathic surgery and following microinjections of rapamycin into the IC on postoperative days (PODs) 3 and 7. Optical recording was conducted to observe the neural responses of the IC to peripheral stimulation. Rapamycin reduced mechanical allodynia and downregulated the expression of postsynaptic density protein 95 (PSD95), decreased neural excitability in the IC, thereby inhibiting neuropathic pain-induced synaptic plasticity. These findings suggest that mTOR signaling in the IC may be a critical molecular mechanism modulating neuropathic pain.
Files in This Item:
T201700688.pdf Download
DOI
10.3389/fnmol.2017.00079
Appears in Collections:
1. College of Medicine (의과대학) > Dept. of Anesthesiology and Pain Medicine (마취통증의학교실) > 1. Journal Papers
1. College of Medicine (의과대학) > Dept. of Physiology (생리학교실) > 1. Journal Papers
Yonsei Authors
Kim, Un Jeng(김은정) ORCID logo https://orcid.org/0000-0003-0968-0252
Bai, Sun Joon(배선준) ORCID logo https://orcid.org/0000-0001-5027-3232
Lee, Bae Hwan(이배환) ORCID logo https://orcid.org/0000-0003-4719-9021
Cha, Myeoung Hoon(차명훈) ORCID logo https://orcid.org/0000-0002-7993-672X
URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/154472
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