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Hyperbaric oxygen treatment attenuates neuropathic pain by elevating autophagy flux via inhibiting mTOR pathway

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Hyperbaric oxygen treatment attenuates neuropathic pain by elevating autophagy flux via inhibiting mTOR pathway

Am J Transl Res
2017 May 15;9(5):2629–2638.
Author
Yong-Da Liu, Zhi-Bin Wang , Guang Han , Ping Zhao
Author Information

1Department of Anesthesiology and Pain Management, Shengjing Hospital of China Medical University, Shenyang, China

✉Address correspondence to: Ping Zhao, Department of Anesthesiology and Pain Management, Shengjing Hospital of China Medical University, No. 36 Sanhao Street, Heping District, Shenyang 110004, Liaoning, China.
E-mail: zhaop@sj-hospital.org
Article notes

Received 2016 Dec 18; Accepted 2017 Apr 30; Collection date 2017.

Copyright and License information
AJTR Copyright © 2017

PMC Copyright notice

PMCID: PMC5446542 PMID: 28560010

Abstract
Peripheral neuropathic pain is a complex disease, and treated based on underlying diseases. Emerging evidences suggest that hyperbaric oxygen alleviates neuropathic pain. However, its cellular and molecular mechanism on pain relief is unknown. We hypothesize that hyperbaric oxygen alleviates neuropathic pain via activating autophagy flux and inhibiting mTOR pathway. Hyperbaric oxygen effectively inhibited nerve injury induced autophagy impairment and mTOR pathway activation in a rat spinal nerve ligation (SNL) model. Moreover, intrathecal injection of rapamycin, an autophagy inducer, enhanced hyperbaric oxygen effect by further decreasing mTOR activity. In contrast, chloroquine, an autophagy inhibitor, counteracted hyperbaric oxygen analgesic effect. These findings indicate that hyperbaric oxygen attenuated neuropathic pain by increasing spinal autophagic flux via inhibiting mTOR pathway. Our study provides pre-clinical evidences in expediting hyperbaric oxygen become a safe clinical treatment of neuropathic pain.
Keywords:
Spinal nerve ligation, neuropathic pain, autophagy, hyperbaric oxygen, chloroquine, mTOR