Distinct degree of radiculopathy at different levels of peripheral nerve injury
<p>Abstract</p> <p>Background</p> <p>Lumbar radiculopathy is a common clinical problem, characterized by dorsal root ganglion (DRG) injury and neural hyperactivity causing intense pain. However, the mechanisms involved in DRG injury have not been fully elucidated. Furth...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
SAGE Publishing
2012-04-01
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| Series: | Molecular Pain |
| Subjects: | |
| Online Access: | http://www.molecularpain.com/content/8/1/31 |
| _version_ | 1818493395656507392 |
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| author | Takiguchi Noboru Yoshida Munehito Taniguchi Wataru Hashizume Hiroshi Yamada Hiroshi Miyazaki Nobuyuki Nishio Naoko Nakatsuka Terumasa |
| author_facet | Takiguchi Noboru Yoshida Munehito Taniguchi Wataru Hashizume Hiroshi Yamada Hiroshi Miyazaki Nobuyuki Nishio Naoko Nakatsuka Terumasa |
| author_sort | Takiguchi Noboru |
| collection | DOAJ |
| description | <p>Abstract</p> <p>Background</p> <p>Lumbar radiculopathy is a common clinical problem, characterized by dorsal root ganglion (DRG) injury and neural hyperactivity causing intense pain. However, the mechanisms involved in DRG injury have not been fully elucidated. Furthermore, little is known about the degree of radiculopathy at the various levels of nerve injury. The purpose of this study is to compare the degree of radiculopathy injury at the DRG and radiculopathy injury proximal or distal to the DRG.</p> <p>Results</p> <p>The lumbar radiculopathy rat model was created by ligating the L5 nerve root 2 mm proximal to the DRG or 2 mm distal to the DRG with 6.0 silk. We examined the degree of the radiculopathy using different points of mechanical sensitivity, immunohistochemistry and <it>in vivo</it> patch-clamp recordings, 7 days after surgery. The rats injured distal to the DRG were more sensitive than those rats injured proximal to the DRG in the behavioral study. The number of activated microglia in laminas I–II of the L5 segmental level was significantly increased in rats injured distal to the DRG when compared with rats injured proximal to the DRG. The amplitudes and frequencies of EPSC in the rats injured distal to the DRG were higher than those injured proximal to the DRG. The results indicated that there is a different degree of radiculopathy at the distal level of nerve injury.</p> <p>Conclusions</p> <p>Our study examined the degree of radiculopathy at different levels of nerve injury. Severe radiculopathy occurred in rats injured distal to the DRG when compared with rats injured proximal to the DRG. This finding helps to correctly diagnose a radiculopathy.</p> |
| first_indexed | 2024-12-10T17:54:40Z |
| format | Article |
| id | doaj.art-53004ff5b23445b888e157493e6ffb03 |
| institution | Directory Open Access Journal |
| issn | 1744-8069 |
| language | English |
| last_indexed | 2024-12-10T17:54:40Z |
| publishDate | 2012-04-01 |
| publisher | SAGE Publishing |
| record_format | Article |
| series | Molecular Pain |
| spelling | doaj.art-53004ff5b23445b888e157493e6ffb032022-12-22T01:38:58ZengSAGE PublishingMolecular Pain1744-80692012-04-01813110.1186/1744-8069-8-31Distinct degree of radiculopathy at different levels of peripheral nerve injuryTakiguchi NoboruYoshida MunehitoTaniguchi WataruHashizume HiroshiYamada HiroshiMiyazaki NobuyukiNishio NaokoNakatsuka Terumasa<p>Abstract</p> <p>Background</p> <p>Lumbar radiculopathy is a common clinical problem, characterized by dorsal root ganglion (DRG) injury and neural hyperactivity causing intense pain. However, the mechanisms involved in DRG injury have not been fully elucidated. Furthermore, little is known about the degree of radiculopathy at the various levels of nerve injury. The purpose of this study is to compare the degree of radiculopathy injury at the DRG and radiculopathy injury proximal or distal to the DRG.</p> <p>Results</p> <p>The lumbar radiculopathy rat model was created by ligating the L5 nerve root 2 mm proximal to the DRG or 2 mm distal to the DRG with 6.0 silk. We examined the degree of the radiculopathy using different points of mechanical sensitivity, immunohistochemistry and <it>in vivo</it> patch-clamp recordings, 7 days after surgery. The rats injured distal to the DRG were more sensitive than those rats injured proximal to the DRG in the behavioral study. The number of activated microglia in laminas I–II of the L5 segmental level was significantly increased in rats injured distal to the DRG when compared with rats injured proximal to the DRG. The amplitudes and frequencies of EPSC in the rats injured distal to the DRG were higher than those injured proximal to the DRG. The results indicated that there is a different degree of radiculopathy at the distal level of nerve injury.</p> <p>Conclusions</p> <p>Our study examined the degree of radiculopathy at different levels of nerve injury. Severe radiculopathy occurred in rats injured distal to the DRG when compared with rats injured proximal to the DRG. This finding helps to correctly diagnose a radiculopathy.</p>http://www.molecularpain.com/content/8/1/31RadiculopathyMicrogliaPatch-clamp |
| spellingShingle | Takiguchi Noboru Yoshida Munehito Taniguchi Wataru Hashizume Hiroshi Yamada Hiroshi Miyazaki Nobuyuki Nishio Naoko Nakatsuka Terumasa Distinct degree of radiculopathy at different levels of peripheral nerve injury Molecular Pain Radiculopathy Microglia Patch-clamp |
| title | Distinct degree of radiculopathy at different levels of peripheral nerve injury |
| title_full | Distinct degree of radiculopathy at different levels of peripheral nerve injury |
| title_fullStr | Distinct degree of radiculopathy at different levels of peripheral nerve injury |
| title_full_unstemmed | Distinct degree of radiculopathy at different levels of peripheral nerve injury |
| title_short | Distinct degree of radiculopathy at different levels of peripheral nerve injury |
| title_sort | distinct degree of radiculopathy at different levels of peripheral nerve injury |
| topic | Radiculopathy Microglia Patch-clamp |
| url | http://www.molecularpain.com/content/8/1/31 |
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