Caeruloplasmin concentration and oxidase activity in polyarthritis

Area of Science:

• Biochemistry
• Immunology
• Rheumatology

Background:

• Caeruloplasmin (Cp) concentration and oxidase activity are altered in certain inflammatory arthropathies.
• Previous studies indicate elevated Cp in rheumatoid arthritis (RA) and psoriatic arthritis.
• Cp levels are reportedly normal in Reiter's syndrome, Behcet's syndrome, and juvenile seronegative polyarthritis.

Purpose of the Study:

• To investigate the role of caeruloplasmin in various arthritic conditions.
• To compare serum and synovial fluid Cp levels in RA patients.
• To assess the impact of second-line therapy on Cp concentration and activity in RA.

Main Methods:

• Measurement of caeruloplasmin concentration and oxidase activity in serum and synovial fluid.
• Comparison of Cp levels across different types of arthritis.
• Monitoring Cp levels during and after second-line therapy for RA.
• Correlation analysis between Cp changes and plasma viscosity.

Main Results:

• Caeruloplasmin concentration and oxidase activity were elevated in RA and psoriatic arthritis.
• Cp levels were normal in Reiter's syndrome, Behcet's syndrome, and juvenile seronegative polyarthritis.
• Synovial fluid Cp was significantly lower than serum Cp in RA patients.
• Second-line therapy in RA led to a significant decrease in Cp concentration and activity (P < 0.001).
• Changes in Cp did not correlate with plasma viscosity during RA therapy.

Conclusions:

• Caeruloplasmin levels differ across various arthritic conditions, being elevated in RA and psoriatic arthritis.
• Synovial fluid Cp is depressed in RA, suggesting localized effects.
• Therapeutic interventions for RA effectively reduce Cp levels, indicating its potential as a marker for disease activity or treatment response.