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Profile of Metalloproteinases and Their Association with Inflammatory Markers in Pleural Effusions
Lisete Ribeiro Teixeira1, Murilo B Dias2, Roberta K B Sales2
1Pleura Laboratory-Pulmonary Division, Heart Institute (InCor), University of Sao Paulo Medical School, Rua Dr. Eneas de Carvalho Aguiar, 44, Cerqueira César, São Paulo, 05403-000, Brazil. lisetepneumo@yahoo.com.br.
Background:
Matrix metalloproteinases (MMPs) are responsible for the breakdown of the extracellular matrix and play an important role in the inflammatory processes of pleural exudates. The imbalance between MMPs and their inhibitors (TIMPs) is present in various pathological processes.
Objective:
To evaluate the profile of MMPs and TIMPs in pleural effusions of different etiologies correlated with inflammatory markers.
Methods:
The patients with pleural effusion due to tuberculosis (TB), cancer (CA) or transudate were prospectively evaluated. Pleural fluid was submitted to cytological, biochemical, cytokines, MMP, and TIMP analysis. Statistical analysis was performed using ANOVA and Spearman's correlation, and p < 0.05 was considered significant.
Results:
One hundred and fourteen patients were enrolled, 80 exudates (41 TB and 39 CA) and 34 transudates. The levels of MMP-8 and MMP-9 were higher in exudates compared to transudates. The level of MMP-8 was significantly higher in TB than in CA. TIMP-1 levels were higher in exudates. IL-6, VEGF, and TGF-β1 showed differences between exudates and transudates. However, IL-6 level was higher in TB than in CA. We found a significant correlation between MMPs and TIMPs with inflammation markers. MMP-1 was correlated with LDH levels. MMP-8 was correlated with LDH, total cell count, neutrophils, and ADA as well as MMP-1 levels. MMP-9 was correlated with IL-6, TGF-β1, and VEGF. TIMP-1 was correlated with MMP-9 and IL-6.
Conclusions:
MMPs and TIMPs are expressed in pleural fluid of different etiologies and correlate with inflammatory mediators. MMPs may be useful in determining the cause of fluid, but more studies are needed to determine the spectrum of diseases associated with the various isoforms of MMPS and TIMPs.
Insights
Matrix metalloproteinases (MMPs) and their inhibitors (TIMPs) are present in pleural effusions and correlate with inflammatory markers. These MMPs and TIMPs may help determine the cause of pleural fluid, warranting further investigation.
Area of Science:
- Biochemistry
- Pathology
- Immunology
Background:
- Matrix metalloproteinases (MMPs) degrade the extracellular matrix and are implicated in pleural exudate inflammation.
- An imbalance between MMPs and tissue inhibitors of metalloproteinases (TIMPs) is observed in various pathological conditions.
Purpose of the Study:
- To analyze the profile of MMPs and TIMPs in pleural effusions across different etiologies.
- To correlate MMP and TIMP levels with inflammatory markers in pleural effusions.
Main Methods:
- Prospective evaluation of 114 patients with pleural effusion (tuberculosis, cancer, transudate).
- Analysis of pleural fluid for cytology, biochemistry, cytokines, MMPs, and TIMPs.
- Statistical analysis using ANOVA and Spearman's correlation (p < 0.05 significance).
Main Results:
- MMP-8 and MMP-9 levels were elevated in exudates versus transudates; MMP-8 was higher in tuberculosis than cancer.
- TIMP-1 levels were higher in exudates.
- MMPs and TIMPs correlated significantly with inflammatory markers like IL-6, LDH, and VEGF.
Conclusions:
- MMPs and TIMPs are expressed in pleural fluid and correlate with inflammatory mediators.
- MMPs show potential as biomarkers for identifying the etiology of pleural effusion.
- Further research is needed to elucidate the role of specific MMP and TIMP isoforms in various diseases.
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