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Detection of Functional Matrix Metalloproteinases by Zymography
Published on: November 8, 2010
Serum matrix metalloproteinase levels in patients exposed to sulfur mustard
Majid Shohrati1, Reza Haji Hosseini2, Malek Ashtar Esfandiari2
1Chemical Injuries Research Center, Baqiyatallah University of Medical Sciences, Tehran, IR Iran.
Background:
Matrix metalloproteinases (MMPs) are a group of endopeptidases which comprised of various types. These proteolytic enzymes are zinc-dependent and play role in degradation of extracellular matrix (ECM). Various types of cells such as macrophages, fibroblasts, neutrophils, synovial cells and some epithelial cells secrete MMPs. According to previous studies on bronchiolitis and respiratory tract lesions in these patients and unknown pathophysiology mechanism up to date, this cross-sectional study was performed.
Objectives:
The aim of this study was to compare the serum MMP level in patients with chemical injuries and normal people and also determine the role of these parameters in pulmonary disorders .
Materials And Methods:
In this cross-sectional study, 25 Iranian patients exposed to the sulfur mustard and 25 unexposed participants as the control group were enrolled. Serum samples were collected from two groups and stored at -70˚C until the measurement of MMPs and TIMPs. ELISA kit was used for measurement of MMP and TIMP based on the kit's instruction. For validations in measurement, all samples were analyzed duplicate and in some cases triplicate.
Results:
The mean level of MMP-9 in serum of chemically-injured group was 1592.42 and this amount in normal group was 679.72 .So there was a significant difference between two groups (P = 0.001) and the mean level of MMP-8 in serum of patients group was 49.10 and in normal group was 35.53. Then there was no significant difference between two groups (P = 0.197). The mean levels of MMP-1 and MMP-2 was not significantly different (P value > 0.05) in the patient and normal groups. And also the mean levels of TIMP-1 and TIMP-2 was not significantly different (P > 0.05) in the patients and normal groups.
Conclusions:
In summary, serum MMPs in chemically-injured has shown no significant difference with normal people except for the MMP-9.
Insights
Serum matrix metalloproteinase-9 (MMP-9) levels were significantly elevated in individuals with chemical injuries compared to controls. Other MMPs and TIMPs showed no significant differences, suggesting MMP-9
Area of Science:
- Biochemistry and Molecular Biology
- Toxicology and Environmental Health
- Pulmonology and Respiratory Medicine
Background:
- Matrix metalloproteinases (MMPs) are crucial enzymes involved in extracellular matrix degradation, secreted by various cell types.
- Their role in respiratory conditions, particularly after chemical injuries like sulfur mustard exposure, remains incompletely understood.
- This study investigates MMPs in the context of chemical injury-induced pulmonary disorders.
Purpose of the Study:
- To compare serum MMP levels between individuals with chemical injuries and healthy controls.
- To investigate the potential role of MMPs and their inhibitors (TIMPs) in pulmonary complications following chemical exposure.
- To identify specific MMPs that may serve as biomarkers for chemical injury.
Main Methods:
- A cross-sectional study involving 25 Iranian patients with sulfur mustard exposure and 25 unexposed controls.
- Serum samples were collected and stored at -70°C for subsequent analysis.
- Enzyme-linked immunosorbent assay (ELISA) kits were used to quantify MMPs and TIMPs, with duplicate or triplicate sample analysis for validation.
Main Results:
- Serum MMP-9 levels were significantly higher in the chemically injured group (1592.42) compared to the control group (679.72) (P=0.001).
- No significant differences were observed in MMP-8, MMP-1, MMP-2, TIMP-1, or TIMP-2 levels between the two groups (P > 0.05).
- MMP-8 levels showed a trend towards higher concentration in patients but did not reach statistical significance (P=0.197).
Conclusions:
- Serum MMP-9 levels are significantly elevated in individuals following chemical injuries, indicating a potential role in the pathophysiology of related pulmonary disorders.
- While other MMPs and TIMPs did not show significant differences, MMP-9 emerges as a potential biomarker for chemical injury.
- Further research is warranted to elucidate the precise mechanisms by which MMP-9 contributes to lung injury and to explore therapeutic interventions targeting this enzyme.
