Abstract | STUDY DESIGN: Experimental animal study. PURPOSE: To evaluate pain-related behavior and changes in glial activity in the spinal dorsal horn after combined sciatic nerve compression and nucleus pulposus (NP) application in rats. OVERVIEW OF LITERATURE: METHODS: The sciatic nerve was compressed with NP for 2 seconds using forceps in the NP+nerve compression group; the sham-operated group received neither compression nor NP; and the control group received no operation. Mechanical hyperalgesia was measured for 3 weeks using von Frey filaments. Glial activity in the spinal dorsal horn was examined 7 days and 14 days postsurgery using anti- glial fibrillary acidic protein and anti-Ionized calcium binding adaptor molecule-1 antibodies to detect astrocytes and microglia, respectively. RESULTS:
Mechanical hyperalgesia was detected throughout the 14-day observation in the NP+nerve compression group, but not in control or sham-operated groups (p<0.05). Both astrocytes and microglia were significantly increased in the spinal dorsal horn of the NP+nerve compression group compared to control and sham groups on days 7 and 14 (p<0.05). CONCLUSIONS: Nerve compression with NP application produces pain-related behavior, and up-regulates astrocytes and microglia in the spinal dorsal horn, suggesting that these glia may be related to pain transmission.
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Authors | Masaki Norimoto, Yoshihiro Sakuma, Miyako Suzuki, Sumihisa Orita, Kazuyo Yamauchi, Gen Inoue, Yasuchika Aoki, Tetsuhiro Ishikawa, Masayuki Miyagi, Hiroto Kamoda, Gou Kubota, Yasuhiro Oikawa, Kazuhide Inage, Takeshi Sainoh, Jun Sato, Junichi Nakamura, Tomoaki Toyone, Kazuhisa Takahashi, Seiji Ohtori |
Journal | Asian spine journal
(Asian Spine J)
Vol. 8
Issue 5
Pg. 549-56
(Oct 2014)
ISSN: 1976-1902 [Print] Korea (South) |
PMID | 25346806
(Publication Type: Journal Article)
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