Abstract | STUDY DESIGN: Investigation of intraradicular inflammation induced by mechanical compression. OBJECTIVE: SUMMARY OF BACKGROUND DATA: The manifestation of pain at sites of inflammation has a close relationship with the release of mediators from macrophages. However, the mediators involved in inflammation of nerve roots as a result of mechanical compression remain almost unknown. METHODS: RESULTS: In control animals, resident T cells were detected, but there were no macrophages. IL-1beta and COX-2 were positive in the Schwann cells and vascular endothelial cells, while COX-1 was detected in the vascular endothelial cells. However, no cells showed TNF-alpha or i-NOS positively. After nerve root compression, numerous T cells and macrophages appeared among the demyelinized nerve fibers. The macrophages were positive for IL-1beta, TNF-alpha, i-NOS, and COX-2. CONCLUSION: Inflammatory cytokines, NO, and COX-2 may be deeply involved in radiculitis caused by mechanical compression, and these mediators seem to be important in the manifestation of root pain.
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Authors | Shigeru Kobayashi, Hisatoshi Baba, Kenzo Uchida, Yasuo Kokubo, Chikara Kubota, Syuuich Yamada, Yoshihiko Suzuki, Hidezo Yoshizawa |
Journal | Spine
(Spine (Phila Pa 1976))
Vol. 30
Issue 15
Pg. 1699-705
(Aug 01 2005)
ISSN: 1528-1159 [Electronic] United States |
PMID | 16094269
(Publication Type: Comparative Study, Journal Article)
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Chemical References |
- Cytokines
- Nitric Oxide
- Prostaglandin-Endoperoxide Synthases
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Topics |
- Animals
- Cytokines
(analysis, biosynthesis)
- Dogs
- Lumbar Vertebrae
(chemistry, metabolism, pathology)
- Nerve Compression Syndromes
(metabolism, pathology)
- Nitric Oxide
(analysis, biosynthesis)
- Prostaglandin-Endoperoxide Synthases
(analysis, biosynthesis)
- Radiculopathy
(metabolism, pathology)
- Spinal Nerve Roots
(chemistry, metabolism, pathology)
- Stress, Mechanical
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