Direct Application of the Tumor Necrosis Factor-α Inhibitor, Etanercept, Into a Punctured Intervertebral Disc Decreases Calcitonin Gene-Related Peptide Expression in Rat Dorsal Root Ganglion Neurons
| Autor: | Gen Inoue, Tomoaki Toyone, Masaomi Yamashita, Miyako Suzuki, Nobuyasu Ochiai, Junichi Nakamura, Kazuyo Yamauchi, Yasuchika Aoki, Kazuhisa Takahashi, Gen Arai, Shunji Kishida, Masayuki Miyagi, Tetsuhiro Ishikawa, Masashi Takaso, Yawara Eguchi, Seiji Ohtori, Sumihisa Orita, Maiko Nagata, Manato Horii, Kazuki Kuniyoshi, Hiroto Kamoda |
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| Rok vydání: | 2011 |
| Předmět: |
Male
Pathology medicine.medical_specialty Calcitonin Gene-Related Peptide Neuropeptide Intervertebral Disc Degeneration Punctures Calcitonin gene-related peptide Receptors Tumor Necrosis Factor Etanercept Rats Sprague-Dawley Dorsal root ganglion Ganglia Spinal medicine Animals Orthopedics and Sports Medicine Intervertebral Disc Fluorescent Dyes Neurons Tumor Necrosis Factor-alpha business.industry Intervertebral disc Anatomy Immunohistochemistry Rats medicine.anatomical_structure nervous system Calcitonin Immunoglobulin G Tumor necrosis factor alpha Neurology (clinical) business medicine.drug |
| Zdroj: | Spine. 36:E80-E85 |
| ISSN: | 0362-2436 |
| Popis: | Study design retrograde neurotracing and immunohistochemistry were used to investigate the effect of the tumor necrosis factor (TNF)-α inhibitor, etanercept, on calcitonin gene-related peptide (CGRP) expression in dorsal root ganglion (DRG) neurons innervating intervertebral discs in rats. Objective to clarify the action of a TNF-α inhibitor on a sensory neuropeptide in DRG neurons innervating intervertebral discs. Summary of background data degeneration of lumbar intervertebral discs is a cause of low back pain. TNF-α in the intervertebral disc is a major contributor to discogenie pain. Effects of TNF-α inhibition on CGRP expression in DRG neurons were evaluated. Methods the neurotracer FluoroGold was applied to the surfaces of L4/5 discs to label their innervating DRG neurons (n = 30). Of 30 rats, 10 were in a nonpunctured disc sham surgery control group, whereas the other 20 were in experimental groups in which intervertebral discs were punctured with a 23-gauge needle. Etanercept or saline was applied into the punctured discs (n = 10 each treatment). After 14 days of surgery, DRGs from L1 to L6 were harvested, sectioned, and immunostained for CGRP. The proportion of FluoroGold-labeled CGRP-immunoreactive DRG neurons was evaluated in all groups. Results FluoroGold-labeled neurons innervating the L4/5 disc were distributed throughout L1-L6 DRGs in all groups. Of the FluoroGold-labeled neurons, the proportion of CGRP-immunoreactive neurons was 21% ± 4% in the sham surgery control group, 32% ± 7% in the puncture + saline group, and 23% ± 4% in the puncture + etanercept group. The proportion of CGRP-immunoreactive neurons was significantly greater in the puncture + saline group compared with the sham control and puncture + etanercept groups (P Conclusion in this model, CGRP was upregulated in DRG neurons innervating damaged discs. However, direct intradiscal application of etanercept immediately after disc puncture suppressed CGRP expression in DRG neurons innervating injured discs. This finding may further elucidate the mechanism for the effectiveness of etanercept in upregulation of neuropeptide in DRG neurons innervating intervertebral discs. |
| Databáze: | OpenAIRE |
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