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Article

Upregulation of TRESK Channels Contributes to Motor and Sensory Recovery after Spinal Cord Injury

1
Department of Physiology and Institute of Health Sciences, College of Medicine, Gyeongsang National University, Jinju 52727, Korea
2
Department of Convergence Medical Science, Gyeongsang National University, Jinju 52727, Korea
3
Department of Rehabilitation Medicine, College of Medicine, Gyeongsang National University, Jinju 52727, Korea
4
Biomedical Research Institute, Gyeongsang National University Hospital, Jinju 52727, Korea
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Int. J. Mol. Sci. 2020, 21(23), 8997; https://doi.org/10.3390/ijms21238997
Received: 5 November 2020 / Revised: 22 November 2020 / Accepted: 24 November 2020 / Published: 26 November 2020
(This article belongs to the Special Issue Neuroinflammation and Pain)
TWIK (tandem-pore domain weak inward rectifying K+)-related spinal cord K+ channel (TRESK), a member of the two-pore domain K+ channel family, is abundantly expressed in dorsal root ganglion (DRG) neurons. It is well documented that TRESK expression is changed in several models of peripheral nerve injury, resulting in a shift in sensory neuron excitability. However, the role of TRESK in the model of spinal cord injury (SCI) has not been fully understood. This study investigates the role of TRESK in a thoracic spinal cord contusion model, and in transgenic mice overexpressed with the TRESK gene (TGTRESK). Immunostaining analysis showed that TRESK was expressed in the dorsal and ventral neurons of the spinal cord. The TRESK expression was increased by SCI in both dorsal and ventral neurons. TRESK mRNA expression was upregulated in the spinal cord and DRG isolated from the ninth thoracic (T9) spinal cord contusion rats. The expression was significantly upregulated in the spinal cord below the injury site at acute time points (6, 24, and 48 h) after SCI (p < 0.05). In addition, TRESK expression was markedly increased in DRGs below and adjacent to the injury site. TRESK was expressed in inflammatory cells. In addition, the number and fluorescence intensity of TRESK-positive neurons increased in the dorsal and ventral horns of the spinal cord after SCI. TGTRESK SCI mice showed faster paralysis recovery and higher mechanical threshold compared to wild-type (WT)-SCI mice. TGTRESK mice showed lower TNF-α concentrations in the blood than WT mice. In addition, IL-1β concentration and apoptotic signals in the caudal spinal cord and DRG were significantly decreased in TGTRESK SCI mice compared to WT-SCI mice (p < 0.05). These results indicate that TRESK upregulated following SCI contributes to the recovery of paralysis and mechanical pain threshold by suppressing the excitability of motor and sensory neurons and inflammatory and apoptotic processes. View Full-Text
Keywords: dorsal root ganglion; inflammation; oxidative stress; spinal cord injuries; two-pore domain K+ channel dorsal root ganglion; inflammation; oxidative stress; spinal cord injuries; two-pore domain K+ channel
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MDPI and ACS Style

Kim, G.-T.; Siregar, A.S.; Kim, E.-J.; Lee, E.-S.; Nyiramana, M.M.; Woo, M.S.; Hah, Y.-S.; Han, J.; Kang, D. Upregulation of TRESK Channels Contributes to Motor and Sensory Recovery after Spinal Cord Injury. Int. J. Mol. Sci. 2020, 21, 8997. https://doi.org/10.3390/ijms21238997

AMA Style

Kim G-T, Siregar AS, Kim E-J, Lee E-S, Nyiramana MM, Woo MS, Hah Y-S, Han J, Kang D. Upregulation of TRESK Channels Contributes to Motor and Sensory Recovery after Spinal Cord Injury. International Journal of Molecular Sciences. 2020; 21(23):8997. https://doi.org/10.3390/ijms21238997

Chicago/Turabian Style

Kim, Gyu-Tae, Adrian S. Siregar, Eun-Jin Kim, Eun-Shin Lee, Marie Merci Nyiramana, Min Seok Woo, Young-Sool Hah, Jaehee Han, and Dawon Kang. 2020. "Upregulation of TRESK Channels Contributes to Motor and Sensory Recovery after Spinal Cord Injury" International Journal of Molecular Sciences 21, no. 23: 8997. https://doi.org/10.3390/ijms21238997

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