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Chen W, Chi YN, Kang XJ, Liu QY, Zhang HL, Li ZH, Zhao ZF, Yang Y, Su L, Cai J, Liao FF, Yi M, Wan Y, Liu FY. Accumulation of Ca v3.2 T-type Calcium Channels in the Uninjured Sural Nerve Contributes to Neuropathic Pain in Rats with Spared Nerve Injury. Front Mol Neurosci 2018; 11:24. [PMID: 29472842 PMCID: PMC5809483 DOI: 10.3389/fnmol.2018.00024] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2017] [Accepted: 01/17/2018] [Indexed: 11/13/2022] Open
Abstract
Injuries to peripheral nerve fibers induce neuropathic pain. But the involvement of adjacent uninjured fibers to pain is not fully understood. The present study aims to investigate the possible contribution of Cav3.2 T-type calcium channels in uninjured afferent nerve fibers to neuropathic pain in rats with spared nerve injury (SNI). Aβ-, Aδ- and C-fibers of the uninjured sural nerve were sensitized revealed by in vivo single-unit recording, which were accompanied by accumulation of Cav3.2 T-type calcium channel proteins shown by Western blotting. Application of mibefradil, a T-type calcium channel blocker, to sural nerve receptive fields increased mechanical thresholds of Aβ-, Aδ- and C-fibers, confirming the functional involvement of accumulated channels in the sural nerve in SNI rats. Finally, perineural application of mibefradil or TTA-P2 to the uninjured sural nerve alleviated mechanical allodynia in SNI rats. These results suggest that axonal accumulation of Cav3.2 T-type calcium channels plays an important role in the uninjured sural nerve sensitization and contributes to neuropathic pain.
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Affiliation(s)
- Wen Chen
- Neuroscience Research Institute, Peking University, Beijing, China.,Department of Neurobiology, School of Basic Medical Sciences, Peking University, Beijing, China.,Key Laboratory for Neuroscience, Ministry of Education/National Health and Family Planning Commission, Peking University, Beijing, China
| | - Ye-Nan Chi
- Neuroscience Research Institute, Peking University, Beijing, China.,Department of Anesthesiology, Dongfang Hospital, Beijing University of Chinese Medicine, Beijing, China
| | - Xue-Jing Kang
- Neuroscience Research Institute, Peking University, Beijing, China
| | - Qing-Ying Liu
- Neuroscience Research Institute, Peking University, Beijing, China
| | - Hao-Lin Zhang
- Neuroscience Research Institute, Peking University, Beijing, China
| | - Zhi-Hua Li
- Department of Human Anatomy, School of Basic Medical Sciences, Zhengzhou University, Zhengzhou, China
| | - Zi-Fang Zhao
- Neuroscience Research Institute, Peking University, Beijing, China
| | - Yin Yang
- Neuroscience Research Institute, Peking University, Beijing, China
| | - Li Su
- Neuroscience Research Institute, Peking University, Beijing, China.,Center of Medical and Health Analysis, Peking University, Beijing, China
| | - Jie Cai
- Neuroscience Research Institute, Peking University, Beijing, China
| | - Fei-Fei Liao
- Neuroscience Research Institute, Peking University, Beijing, China
| | - Ming Yi
- Neuroscience Research Institute, Peking University, Beijing, China
| | - You Wan
- Neuroscience Research Institute, Peking University, Beijing, China.,Department of Neurobiology, School of Basic Medical Sciences, Peking University, Beijing, China.,Key Laboratory for Neuroscience, Ministry of Education/National Health and Family Planning Commission, Peking University, Beijing, China
| | - Feng-Yu Liu
- Neuroscience Research Institute, Peking University, Beijing, China.,Department of Neurobiology, School of Basic Medical Sciences, Peking University, Beijing, China
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