Spine Surgery and Related Research
Online ISSN : 2432-261X
ISSN-L : 2432-261X
Vascular endothelial growth factor in degenerating intervertebral discs of rat caudal vertebrae
Jun Sato, Kazuhide Inage, Masayuki Miyagi, Yoshihiro Sakuma, Kazuyo Yamauchi, Masahiko Suzuki, Masao Koda, Takeo Furuya, Junichi Nakamura, Yawara Eguchi, Miyako Suzuki, Go Kubota, Yasuhiro Oikawa, Takeshi Sainoh, Kazuki Fujimoto, Yasuhiro Shiga, Koki Abe, Hirohito Kanamoto, Masahiro Inoue, Hideyuki Kinoshita, Masaki Norimoto, Tomotaka Umimura, Kazuhisa Takahashi, Seiji Ohtori, Sumihisa Orita
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Keywords: inflammation, cytokine, intervertebral disc, rat, vascular endothelial growth factor
JOURNAL OPEN ACCESS

2018 Volume 2 Issue 1 Pages 42-47

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Abstract

Introduction: Discogenic back pain remains poorly understood with respect to etiopathogenesis, despite being a considerable burden. We sought to examine the expression of vascular endothelial growth factor in injured intervertebral discs in rat caudal vertebrae.

Methods: Forty-eight male Sprague Dawley rats were assigned to 2 groups according to disc puncture injury: puncture (n = 32) or non-puncture (n = 16). Disc puncture was performed percutaneously such that the incision would be in the primary plane of motion for the coccygeal discs 5-6, 6-7, and 7-8. A 26-gauge needle was used to puncture each disc 10 times. Punctured discs were examined histologically by hematoxylin and eosin staining at 1, 7, 14, and 28 days post-injury.

Results: Vascular endothelial growth factor was localized immunohistochemically, and determined quantitatively using an enzyme-linked immunosorbent assay. Peak inflammation occurred on the 7th day post-injury, but tissue degeneration continued until day 28. Local expression of vascular endothelial growth factor tended to be highest in the annulus fibrosus on the 7th and 14th days after puncture injury. The level of vascular endothelial growth factor was highest 1-day post-injury, and then gradually decreased thereafter. Furthermore, vascular endothelial growth factor levels in the puncture group were significantly higher than those in the non-puncture control group (p < 0.05).

Conclusions: We found increased expression of the inflammatory cytokine vascular endothelial growth factor in injured intervertebral discs, suggesting that vascular endothelial growth factor may be clinically important in discogenic back pain.

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© 2018 The Japanese Society for Spine Surgery and Related Research.

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