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자료유형
학술저널
저자정보
Koki Abe (Chiba University) Kazuhide Inage (Chiba University) Yoshihiro Sakuma (Chiba Medical Center) Sumihisa Orita (Chiba University) Kazuyo Yamauchi (Chiba University) Miyako Suzuki (Chiba University) Go Kubota (Chiba University) Yasuhiro Oikawa (Chiba Children’s Hospital) Takeshi Sainoh (Chiba University) Jun Sato (Chiba University) Kazuki Fujimoto (Chiba University) Yasuhiro Shiga (Chiba University) Hirohito Kanamoto (Chiba University) Kazuhisa Takahashi (Chiba University) Seiji Ohtori (Chiba University)
저널정보
대한척추외과학회 Asian Spine Journal Asian Spine Journal Vol.11 No.1
발행연도
2017.1
수록면
88 - 92 (5page)

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Study Design: Animal model study. Purpose: The purpose of this study was to evaluate the histological variation in the injured muscle and production of calcitonin generelated peptide in rats over time. Overview of Literature: Vertebral surgery has been reported to cause atrophy of the back muscles, which may result in pain. However, few reports have described the time series histological variation in the injured muscle and changes in the dominant nerve. Methods: We used 30 male, 8-week-old Sprague-Dawley rats. The right and left sides of the paravertebral muscle were considered as the injured and uninjured sides, respectively. A 115 g weight was dropped from a height of 1 m on the right paravertebral muscle. Hematoxylin and eosin (H&E) staining of the muscle was performed 1–3 weeks after injury for histological evaluation. Fluoro-Gold (FG) was injected into the paravertebral muscle. The L2 dorsal root ganglia on both sides were resected 1, 2, and 3 weeks after injury, and immunohistochemical staining for calcitonin gene-related peptide was performed. Results: H&E staining of the paravertebral muscle showed infiltration of inflammatory cells and the presence of granulation tissue in the injured part on the ipsilateral side 1 week after injury. Muscle atrophy occurred 3 weeks after injury, but was repaired via spontaneous replacement of muscle cells/fibers. In contrast, compared with the uninjured side, the percentage of cells double-labeled with FG and calcitonin gene-related peptide in FG-positive cells in the dorsal root ganglia of the injured side was significantly increased at each time point throughout the study period. Conclusions: These results suggest that sensitization of the dominant nerve in the dorsal root ganglia, which may be caused by cicatrix formation, can protract injured muscle pain. This information may be helpful in elucidating the underlying mechanism of persistent pain after back muscle injury.

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