Rheumatoid synovial fibroblast adhesion to human articular cartilage : enhancement by neutrophil proteases

To determine if preexposure of human articular cartilage to activated neutrophils alters rheumatoid synovial fibroblast adhesion to human articular cartilage. Human articular cartilage was exposed to either activated neutrophils, interleukin-1, or supernatants obtained from activated neutrophils tha...

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Bibliographic Details
Published in:Arthritis and rheumatism 1995-11, Vol.38 (11), p.1694-1700
Main Authors: MCCURDY, L, CHATHAM, W. W, BLACKBURN, W. D
Format: Article
Language:English
Subjects:
Adult
Arthritis, Rheumatoid - pathology
Biological and medical sciences
Cartilage, Articular - cytology
Cell Adhesion - drug effects
Chelating Agents - pharmacology
Diseases of the osteoarticular system
Egtazic Acid - pharmacology
Endopeptidases - pharmacology
Fibroblasts - cytology
Humans
Inflammatory joint diseases
Isoflurophate - pharmacology
Medical sciences
Neutrophils - enzymology
Protease Inhibitors - pharmacology
Synovial Membrane - pathology
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Summary:To determine if preexposure of human articular cartilage to activated neutrophils alters rheumatoid synovial fibroblast adhesion to human articular cartilage. Human articular cartilage was exposed to either activated neutrophils, interleukin-1, or supernatants obtained from activated neutrophils that had been treated with different protease inhibitors. Radiolabeled rheumatoid synovial fibroblasts were then incubated with the cartilage and the number of counts associated with the cartilage was determined. Pretreatment of human articular cartilage with either activated neutrophils or supernatants obtained from activated neutrophils enhanced subsequent rheumatoid synovial fibroblast adhesion. In contrast, interleukin-1 treatment of cartilage did not alter the adhesion of synovial fibroblasts. The enhanced adhesion could be attenuated by pretreatment of the neutrophil supernatants with either diisopropylfluorophosphonate or EGTA and almost completely abolished by using both inhibitors. This study demonstrates that adhesion of rheumatoid synovial fibroblasts to human articular cartilage can be enhanced by exposing the cartilage to proteases released by neutrophils. These results suggest that neutrophil products may play a role in enhancing adhesion of rheumatoid synovium to cartilage in vivo.
ISSN:0004-3591
1529-0131
DOI:10.1002/art.1780381123