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http://dx.doi.org/10.3344/kjp.2022.35.4.433

Spinal orexin A attenuates opioid-induced mechanical hypersensitivity in the rat  

Youn, Dong-ho (Department of Oral Physiology, School of Dentistry, Kyungpook National University)
Jun, Jiyeon (Department of Oral Physiology, School of Dentistry, Kyungpook National University)
Kim, Tae Wan (Department of Physiology, College of Veterinary Medicine, Kyungpook National University)
Park, Kibeom (Department of Anesthesiology and Pain Medicine, Keimyung University Dongsan Hospital, Keimyung University School of Medicine)
Publication Information
The Korean Journal of Pain / v.35, no.4, 2022 , pp. 433-439 More about this Journal
Abstract
Background: Repeated administration of opioid analgesics for pain treatment can produce paradoxical hyperalgesia via peripheral and/or central mechanisms. Thus, this study investigated whether spinally (centrally) administered orexin A attenuates opioid-induced hyperalgesia (OIH). Methods: [D-Ala2, N-Me-Phe4, Gly5-ol]-enkephalin (DAMGO), a selective µ-opioid receptor agonist, was used to induce mechanical hypersensitivity and was administered intradermally (4 times, 1-hour intervals) on the rat hind paw dorsum. To determine whether post- or pretreatments with spinal orexin A, dynorphin A, and anti-dynorphin A were effective in OIH, the drugs were injected through an intrathecal catheter whose tip was positioned dorsally at the L3 segment of the spinal cord (5 ㎍ for all). Mechanical hypersensitivity was assessed using von Frey monofilaments. Results: Repeated intradermal injections of DAMGO resulted in mechanical hypersensitivity in rats, lasting more than 8 days. Although the first intrathecal treatment of orexin A on the 6th day after DAMGO exposure did not show any significant effect on the mechanical threshold, the second (on the 8th day) significantly attenuated the DAMGO-induced mechanical hypersensitivity, which disappeared when the type 1 orexin receptor (OX1R) was blocked. However, intrathecal administration of dynorphin or an anti-dynorphin antibody (dynorphin antagonists) had no effect on DAMGO-induced hypersensitivity. Lastly, pretreatment with orexin A, dynorphin, or anti-dynorphin did not prevent DAMGO-induced mechanical hypersensitivity. Conclusions: Spinal orexin A attenuates mechanical hyperalgesia induced by repetitive intradermal injections of DAMGO through OX1R. These data suggest that OIH can be potentially treated by activating the orexin A-OX1R pathway in the spinal dorsal horn.
Keywords
Analgesics, Opioid; Dynorphins; Enkephalin, Ala(2)-MePhe(4)-Gly(5)-; Hyperalgesia; Orexins; Orexin Receptors; Pain; Spinal Cord Dorsal Horn;
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