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Fibroblast-like synovial cells derived from synovial fluid
Judith A Stebulis1, Ronald G Rossetti, Francisco J Atez
1Department of Medicine, Rheumatology Division, University of Massachusetts Medical School, Worcester, Massachusetts, USA. judith.stebulis@umassmed.edu
The Journal of Rheumatology
|February 5, 2005
Summary
Fibroblast-like synovial cells (FLS) can be successfully cultured from synovial fluid (SF), offering a more accessible alternative to tissue. These fluid-derived FLS (fd-FLS) maintain a fibroblast phenotype and respond to inflammatory stimuli.
Area of Science:
- Rheumatology
- Cell Biology
- Immunology
Background:
- Synovial fluid (SF) is a potential source for fibroblast-like synovial cells (FLS).
- Characterizing FLS from SF is crucial for understanding joint inflammation in conditions like rheumatoid arthritis (RA).
Purpose of the Study:
- To establish and characterize fibroblast-like synovial cells (FLS) from synovial fluid (SF).
- To compare fluid-derived FLS (fd-FLS) with tissue-derived FLS (td-FLS).
- To assess the inflammatory mediator production and response to dexamethasone in fd-FLS.
Main Methods:
- SF and synovial tissue specimens were collected from patients with inflammatory arthritis and osteoarthritis.
- FLS were cultured from SF (fd-FLS) and synovial tissue (td-FLS).
- Phenotype characterization was performed using flow cytometry and immunohistochemistry; mRNA levels of IL-6, IL-8, and COX-2 were assessed after TNF-alpha stimulation.
Main Results:
- Cultured fd-FLS exhibited a uniform fibroblast-like morphology and expressed fibroblast markers (Thy-1).
- fd-FLS and td-FLS showed similar cell surface antigen profiles and fibroblast product expression.
- Tumor necrosis factor-alpha-induced increases in IL-6, IL-8, and COX-2 mRNA were suppressed by dexamethasone in both cell types.
Conclusions:
- Fibroblast-like synovial cells (FLS) can be reliably cultured from synovial fluid (SF).
- fd-FLS possess a confirmed fibroblast phenotype and respond similarly to td-FLS.
- fd-FLS provide a more accessible source for studying synovial cells, particularly in early RA when tissue is unavailable.