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Increased levels of serum myeloperoxidase in patients with active rheumatoid arthritis
Wei Wang1, Zijuan Jian1, Jingjing Guo1
1Department of Clinical Laboratory, Xiangya Hospital, Central South University, Changsha, Hunan, PR China.
Aims:
The clinical significance of myeloperoxidase (MPO) has been the focus of investigation because it may contribute to the chronic, non-microbial inflammatory process in various diseases. Here, we determined serum MPO levels in rheumatoid arthritis (RA) and other autoimmune or inflammatory conditions, and investigated the associations between MPO levels and disease activity indicators in RA.
Main Methods:
The distribution of MPO was determined in serum samples from patients with RA, systemic lupus erythematosus (SLE), primary Sjögren's syndrome (pSS), dermatomyositis (DM), or ankylosing spondylitis (AS) and from healthy controls using commercial ELISA kits. Associations of serum MPO levels with the disease variables of RA patients were evaluated.
Key Findings:
All patient samples analyzed showed higher serum levels of MPO than healthy controls. Furthermore, MPO levels in RA were significantly higher than those in the other diseases with the exception of DM. Higher MPO levels were observed in RA patients with increased C-reactive protein (p=0.005) or neutrophil percentage (p<0.001), as well as in those with highly active disease (p<0.001). Moderate positive correlations between MPO levels and IgM (r=0.334, p=0.001), C-reactive protein (r=0.293, p=0.003), erythrocyte sedimentation rate (r=0.240, p=0.016), or DAS28 (r=0.350, p<0.001) were also demonstrated.
Significance:
The MPO concentration is likely to increase in patients with chronic inflammation. The associations between MPO and the disease variables of RA patients support a role for MPO in the inflammatory process of the disease.
Insights
Serum myeloperoxidase (MPO) levels are elevated in rheumatoid arthritis (RA) and correlate with disease activity, suggesting MPO plays a role in chronic inflammation.
Area of Science:
- Biochemistry
- Immunology
- Rheumatology
Background:
- Myeloperoxidase (MPO) is implicated in chronic, non-microbial inflammatory processes.
- Understanding MPO's role in autoimmune and inflammatory diseases is crucial.
Purpose of the Study:
- To determine serum MPO levels in rheumatoid arthritis (RA) and other inflammatory conditions.
- To investigate the association between MPO levels and disease activity indicators in RA.
Main Methods:
- Serum MPO levels were measured using ELISA kits in patients with RA, SLE, pSS, DM, AS, and healthy controls.
- Associations between serum MPO levels and RA disease variables were analyzed.
Main Results:
- Serum MPO levels were significantly higher in all patient groups compared to healthy controls.
- RA patients exhibited higher MPO levels than most other autoimmune diseases, except dermatomyositis.
- Elevated MPO levels in RA correlated with increased C-reactive protein, neutrophil percentage, and disease activity scores (DAS28).
Conclusions:
- MPO concentration increases in patients with chronic inflammation.
- MPO's association with RA disease variables supports its role in RA pathogenesis.
