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The role of reactive oxygen species in capsaicin-induced mechanical hyperalgesia and in the activities of dorsal horn neurons
DC Field | Value | Language |
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dc.contributor.author | Lee, Inhyung | - |
dc.contributor.author | Kim, Hee Kee | - |
dc.contributor.author | Kim, Jae Hyo | - |
dc.contributor.author | Chung, Kyungsoon | - |
dc.contributor.author | Chung, Jin Mo | - |
dc.date.accessioned | 2009-08-24T08:36:24Z | - |
dc.date.available | 2009-08-24T08:36:24Z | - |
dc.date.issued | 2007-03-26 | - |
dc.identifier.citation | Pain 2007;133:9-17 | en |
dc.identifier.issn | 0304-3959 | - |
dc.identifier.issn | http://dx.doi.org/10.1016/j.pain.2007.01.035 | - |
dc.identifier.uri | https://hdl.handle.net/10371/7609 | - |
dc.description.abstract | Previous findings that reactive oxygen species (ROS) are involved in neuropathic pain, mainly through spinal mechanisms, suggest that ROS may be involved in central sensitization. To investigate the possible role of ROS in central sensitization, we examined in rats the effects of ROS scavengers on capsaicin-induced secondary hyperalgesia, which is known to be mediated by central sensitization. We used two different ROS scavengers: phenyl N-tert-butylnitrone (PBN) and 4-hydroxy-2,2,6,6-tetramethylpiperidine 1-oxyl (TEMPOL). Intradermal capsaicin injection (20 μg in 20 μl olive oil) into the hind paw produced primary and secondary hyperalgesia. A systemic administration of PBN (100 mg/kg, i.p.) or TEMPOL (200 mg/kg, i.p.) alleviated capsaicin-induced secondary, but not primary, hyperalgesia. Intrathecal injection of PBN (1 mg inof vertinary Surgery/anesthesiology, College of vetrinary Medic 50 μl saline) greatly reduced hyperalgesia, whereas intracerebroventricular or intradermal injection of PBN produced only a minor analgesic effect, suggesting that PBN takes effect mainly through the spinal cord. Electrophysiological recordings from wide dynamic range (WDR) neurons in the dorsal horn showed that intradermal capsaicin enhanced the evoked responses to peripheral stimuli; systemic PBN or TEMPOL restored the responses to normal levels. Removal of ROS thus restored the responsiveness of spinal WDR neurons to normal levels, suggesting that ROS is involved in central sensitization, at least in part by sensitizing WDR neurons. | en |
dc.description.sponsorship | This work was supported by NIH Grants R01 NS31680, P01 NS11255, and R01 AT01474. We would like to express our gratitude to Ms. Denise Broker for her excellent assistance in editing the manuscript. | en |
dc.language.iso | en | en |
dc.publisher | Elsevier | en |
dc.subject | Free radicals | en |
dc.subject | Inflammatory pain | en |
dc.subject | Central sensitization | en |
dc.subject | ROS | en |
dc.title | The role of reactive oxygen species in capsaicin-induced mechanical hyperalgesia and in the activities of dorsal horn neurons | en |
dc.type | Article | en |
dc.contributor.AlternativeAuthor | 이인형 | - |
dc.contributor.AlternativeAuthor | 김희기 | - |
dc.contributor.AlternativeAuthor | 김재효 | - |
dc.contributor.AlternativeAuthor | 정경순 | - |
dc.contributor.AlternativeAuthor | 정진모 | - |
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