Abstract:
STUDY DESIGN:The topical capsaicin treatment of the sciatic nerve, which was proved to destroy capsaicin-sensitive primary afferent (CSPA) fibers, was performed to determine the effect on decreases in paw withdrawal mechanical threshold (PWMT) and changes in spatial expression pattern of spinal c-Fos protein induced by the direct compression of L5 nerve root with autologous disc. OBJECTIVE:To investigate the role of CSPA fibers in the development of mechanical hyperalgesia in the new sciatica model. SUMMARY OF BACKGROUND DATA:To date, CSPA fibers have been shown to be involved in development of thermal hyperalgesia in various pain models. But the controversy still exists as to whether CSPA fibers are involved in the development of mechanical hyperalgesia in different pain models. To our best knowledge, the role of CSPA in sciatica was not investigated. Therefore, the present study was designed to determine the role of CSPA fibers in the newly developed sciatica model. METHODS:All surgeries were performed in Sprague-Dawley rats. PWMT was measured at the different time points postsurgery and presurgery. The changes in spatial expression pattern of c-Fos protein in the spinal cord were also determined at 3 weeks when PWMT decreased to the peak. RESULTS:The pretreatment with capsaicin produced a complete prevention of mechanical hyperalgesia induced by disc compression. The direct compression of L5 nerve root produced an obvious expression of Fos-like immunoreactivity neurons in the dorsal horn of the spinal cord, which was significantly decreased by pretreatment with capsaicin. CONCLUSION:We conclude that CSPA fibers, which mainly terminated in superficial layers of dorsal horn, may play a key role in mechanical hyperalgesia in the new sciatica model.
journal_name
Spine (Phila Pa 1976)journal_title
Spineauthors
Tang JG,Chen HS,Yuan W,Hou S,Wang X,Zhou Xdoi
10.1097/BRS.0b013e3181604544subject
Has Abstractpub_date
2008-01-15 00:00:00pages
163-8issue
2eissn
0362-2436issn
1528-1159pii
00007632-200801150-00007journal_volume
33pub_type
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