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Published in: European Spine Journal 4/2018

01-04-2018 | Original Article

ISSLS PRIZE IN BASIC SCIENCE 2018: Growth differentiation factor-6 attenuated pro-inflammatory molecular changes in the rabbit anular-puncture model and degenerated disc-induced pain generation in the rat xenograft radiculopathy model

Authors: Shingo Miyazaki, Ashish D. Diwan, Kenji Kato, Kevin Cheng, Won C. Bae, Yang Sun, Junichi Yamada, Carol Muehleman, Mary E. Lenz, Nozomu Inoue, Robert L. Sah, Mamoru Kawakami, Koichi Masuda

Published in: European Spine Journal | Issue 4/2018

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Abstract

Purpose

To elucidate the effects of growth differentiation factor-6 (GDF6) on: (i) gene expression of inflammatory/pain-related molecules and structural integrity in the rabbit intervertebral disc (IVD) degeneration model, and (ii) sensory dysfunction and changes in pain-marker expression in dorsal nerve ganglia (DRGs) in the rat xenograft radiculopathy model.

Methods

Forty-six adolescent rabbits received anular-puncture in two non-consecutive lumbar IVDs. Four weeks later, phosphate-buffered saline (PBS) or GDF6 (1, 10 or 100 µg) was injected into the nucleus pulposus (NP) of punctured discs and followed for 4 weeks for gene expression analysis and 12 weeks for structural analyses. For pain assessment, eight rabbits were sacrificed at 4 weeks post-injection and NP tissues of injected discs were transplanted onto L5 DRGs of 16 nude rats to examine mechanical allodynia. The rat DRGs were analyzed immunohistochemically.

Results

In GDF6-treated rabbit NPs, gene expressions of interleukin-6, tumor necrosis factor-α, vascular endothelial growth factor, prostaglandin-endoperoxide synthase 2, and nerve growth factor were significantly lower than those in the PBS group. GDF6 injections resulted in partial restoration of disc height and improvement of MRI disc degeneration grades with statistical significance in rabbit structural analyses. Allodynia induced by xenograft transplantation of rabbit degenerated NPs onto rat DRGs was significantly reduced by GDF6 injection. Staining intensities for ionized calcium-binding adaptor molecule-1 and calcitonin gene-related peptide in rat DRGs of the GDF6 group were significantly lower than those of the PBS group.

Conclusion

GDF6 injection may change the pathological status of degenerative discs and attenuate degenerated IVD-induced pain.

Graphical Abstract

Appendix
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Metadata
Title
ISSLS PRIZE IN BASIC SCIENCE 2018: Growth differentiation factor-6 attenuated pro-inflammatory molecular changes in the rabbit anular-puncture model and degenerated disc-induced pain generation in the rat xenograft radiculopathy model
Authors
Shingo Miyazaki
Ashish D. Diwan
Kenji Kato
Kevin Cheng
Won C. Bae
Yang Sun
Junichi Yamada
Carol Muehleman
Mary E. Lenz
Nozomu Inoue
Robert L. Sah
Mamoru Kawakami
Koichi Masuda
Publication date
01-04-2018
Publisher
Springer Berlin Heidelberg
Published in
European Spine Journal / Issue 4/2018
Print ISSN: 0940-6719
Electronic ISSN: 1432-0932
DOI
https://doi.org/10.1007/s00586-018-5488-1

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