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Nucleotide pyrophosphohydrolase in human synovial fluid
1Department of Medicine, Medical College of Wisconsin, Milwaukee 53226, USA.
The Journal of Rheumatology
|August 1, 1997
Summary
Ecto-nucleotide pyrophosphohydrolase (NTPPHase) enzymes were identified in human synovial fluid, with activity correlating to joint degeneration. While no single enzyme was disease-specific, higher activity of the 127 kDa enzyme was noted in fluids with CPPD crystals.
Area of Science:
- Biochemistry
- Molecular Biology
- Rheumatology
Background:
- Ectonucleotide pyrophosphohydrolase (NTPPHase) plays a role in regulating pyrophosphate levels.
- Understanding the molecular forms of NTPPHase in human synovial fluid (SF) is crucial for joint disease research.
Purpose of the Study:
- To identify the specific molecular forms of ectonucleotide pyrophosphohydrolase (NTPPHase) present in human synovial fluid (SF).
Main Methods:
- Synovial fluids from patients with various joint diseases and normal individuals were analyzed for NTPPHase activity.
- Western blot analysis was performed using antibodies against known ecto-NTPPHases (127 kDa, PC-1, and 58 kDa).
- Human synoviocytes and porcine chondrocytes were examined for enzyme expression.
Main Results:
- NTPPHase activity was detected in all tested synovial fluids and correlated with radiographic degeneration.
- The 127 kDa enzyme was found in both soluble and sedimentable fractions, with higher specific activity in CPPD deposition disease fluids.
- PC-1 and 127 kDa proteins showed degradation in inflammatory fluids, while the 58 kDa enzyme was more stable.
Conclusions:
- No single ecto-NTPPHase was exclusively associated with a specific joint disease.
- Total NTPPHase activity correlated with the degree of joint degeneration.
- The presence and degradation patterns of different NTPPHase forms suggest complex regulation in human joint tissues.