Volume 13, Issue 1 pp. 87-98
RESEARCH ARTICLE

Temporal effects of cytokine treatment on lubricant synthesis and matrix metalloproteinase activity of fibroblast-like synoviocytes

Ahmad E. Abu-Hakmeh

Ahmad E. Abu-Hakmeh

Laboratory for Tissue Engineering and Morphogenesis, Department of Biomedical Engineering, Rensselaer Polytechnic Institute, Troy, New York

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Allison K. M. Fleck

Allison K. M. Fleck

Laboratory for Tissue Engineering and Morphogenesis, Department of Biomedical Engineering, Rensselaer Polytechnic Institute, Troy, New York

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Leo Q. Wan

Corresponding Author

Leo Q. Wan

Laboratory for Tissue Engineering and Morphogenesis, Department of Biomedical Engineering, Rensselaer Polytechnic Institute, Troy, New York

Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute, Troy, New York

Center for Modeling, Simulation and Imaging in Medicine, Rensselaer Polytechnic Institute, Troy, New York

Correspondence

Leo Q. Wan, Laboratory for Tissue Engineering and Morphogenesis, Department of Biomedical Engineering, Rensselaer Polytechnic Institute, Biotech 2147, 110 8th Street, Troy, NY 12180.

Email: [email protected]

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First published: 07 November 2018
Citations: 6

Abstract

Fibroblast-like synoviocytes (FLS) are major contributors to the composition and function of synovial fluid (SF). In disease, changes to important SF molecules such as hyaluronic acid (HA), lubricin, and numerous inflammatory markers contribute to a loss of SF functional properties. Previous studies characterized the ability of FLS to produce SF molecules in short-term cultures using continuous cytokine supplementation. This study assessed the HA, lubricin, and matrix metalloproteinase-2 (MMP-2) secretion profile of FLS over 12 days of culture. FLS were subjected to continuous, intermittent, and sequential cytokine treatments of interleukin-1 beta (IL-1β), tumour necrosis factor-alpha (TNF-α), and transforming growth factor-beta 1 (TGF-β1). HA was assessed by an enzyme-linked immunosorbent assay (ELISA) for content and agarose gel electrophoresis for molecular weight distribution. Relative lubricin content was determined by western blot. Pro MMP-2 and active MMP-2 were quantified by gelatin zymography. All intermittent and sequential treatments significantly increased secretion of high-molecular-weight (>3 MDa) HA for the duration of the culture. Sequentially treated groups elevated lubricin synthesis, whereas only groups receiving IL-1β and TNF-α for 2 days followed by TGF-β1 for 1 day reduced active MMP-2 to unstimulated control levels. These data provide important information on the long-term functional potential of cytokine-stimulated FLS and suggest that temporal regulation of cytokine exposure can be a powerful tool to guide healthy synovial secretions.

CONFLICT OF INTEREST

The authors declare no conflict of interest.

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