Journal
JOURNAL OF ORTHOPAEDIC RESEARCH
Volume 29, Issue 1, Pages 1-7Publisher
WILEY
DOI: 10.1002/jor.21206
Keywords
intervertebral disc; cytokine; inflammation; interleukin-17; ICAM-1
Categories
Funding
- NIH [R01AR047442, P01AR05024506, R01AR057410, R01EB00226307, K99AR057426]
- NCBC [2008-CFG-8013]
- Pratt Undergraduate Research Fellowship
- Howard Clark Pre-Doctoral Fellowship
- NATIONAL INSTITUTE OF ARTHRITIS AND MUSCULOSKELETAL AND SKIN DISEASES [R01AR047442, P01AR050245, R01AR057410, K99AR057426] Funding Source: NIH RePORTER
- NATIONAL INSTITUTE OF BIOMEDICAL IMAGING AND BIOENGINEERING [R01EB002263] Funding Source: NIH RePORTER
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Interleukin-17 (IL-17) is a cytokine recently shown to be elevated, along with interferon-gamma (IFN-gamma) and tumor necrosis factor (TNF alpha), in degenerated and herniated intervertebral disc (IVD) tissues, suggesting a role for these cytokines in intervertebral disc disease. The objective of our study was to investigate the involvement of IL-17 and costimulants IFN-gamma and TNF alpha in intervertebral disc pathology. Cells were isolated from anulus fibrosus and nucleus pulposus tissues of patients undergoing surgery for intervertebral disc degeneration or scoliosis. The production of inflammatory mediators, nitric oxide (NOx), prostaglandin E2 (PGE2) and interleukin-6 (IL-6), as well as intercellular adhesion molecule (ICAM-1) expression, were quantified for cultured cells following exposure to IL-17, IFN-gamma, and TNF alpha. Intervertebral disc cells exposed to IL-17, IFN-gamma, or TNF alpha showed a remarkable increase in inflammatory mediator release and ICAM-1 expression (GLM and ANOVA, p < 0.05). Addition of IFN gamma or TNF alpha to IL-17 demonstrated a synergistic increase in inflammatory mediator release, and a marked increase in ICAM-1 expression. These findings suggest that IVD cells not only respond with a catabolic phenotype to IL-17 and costimulants IFN-gamma and TNF alpha, but also express surface ligands with consequent potential to recruit additional lymphocytes and immune cells to the IVD microenvironment. IL-17 may be an important regulator of inflammation in the IVD pathologies. (C) 2010 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 29: 1-7, 2011
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