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Monocyte bone degradation: in vitro analysis of monocyte activity in patients with juvenile rheumatoid arthritis
Abstract:
We examined the ability of the mononuclear phagocyte in vitro to degrade 45Ca-labeled bone particles to determine whether this assay allowed us to monitor disease activity in patients with juvenile rheumatoid arthritis. The monocytes from patients with juvenile rheumatoid arthritis receiving no anti-erosive therapy (n = 10) degraded significantly more bone than did cells obtained from normal controls (n = 10, P less than 0.001) or patients with juvenile rheumatoid arthritis receiving either gold thioglucose (n = 4, P less than 0.001) or D-penicillamine (n = 6, P less than 0.005). In two patients monitored for either 8 or 11 months, results of monocyte assays were found to parallel the clinical course. We conclude that in vitro monocyte bone degradation assays may provide a means of assessing joint activity in patients with juvenile rheumatoid arthritis. Further, this study and others indicate that mononuclear phagocytes are capable of causing erosive changes.
Insights
Mononuclear phagocyte assays can monitor juvenile rheumatoid arthritis activity. These cells degrade more bone in untreated patients, correlating with disease progression.
Area of Science:
- Immunology
- Rheumatology
- Cell Biology
Background:
- Juvenile rheumatoid arthritis (JRA) is a chronic autoimmune disease causing joint inflammation and potential bone erosion.
- Monitoring disease activity in JRA is crucial for effective treatment and preventing long-term joint damage.
Observation:
- Mononuclear phagocytes from JRA patients without anti-erosive therapy showed significantly higher in vitro bone degradation compared to healthy controls.
- This enhanced bone degradation was not observed in JRA patients receiving gold thioglucose or D-penicillamine treatments.
- In a small cohort, monocyte assay results paralleled the clinical course of JRA over 8-11 months.
Findings:
- The in vitro monocyte bone degradation assay is a sensitive indicator of active disease in juvenile rheumatoid arthritis.
- The assay can differentiate between active and treated disease states in JRA patients.
- Mononuclear phagocytes play a significant role in the bone erosive processes characteristic of JRA.
Implications:
- This assay offers a potential new tool for monitoring disease activity and treatment efficacy in juvenile rheumatoid arthritis.
- Understanding the role of mononuclear phagocytes in bone degradation may lead to novel therapeutic strategies for JRA.
- The findings support the hypothesis that mononuclear phagocytes are key mediators of joint damage in rheumatoid arthritis.