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Matrix metalloproteinases and TIMPs: properties and implications for the treatment of chronic obstructive pulmonary
T Cawston1, S Carrere, J Catterall
1Department of Rheumatology, Department of Medicine, University of Newcastle, Framlington Place, Newcastle upon Tyne NE2 4HH, UK.
Abstract:
The matrix metalloproteinases (MMPs) are a unique family of metalloenzymes that, once activated, can destroy connective tissue. The active enzymes are all inhibited by tissue inhibitors of metalloproteinases (TIMPs). The relative amounts of active MMPs and TIMPs are important in determining whether tissues are broken down in disease. Although elastase is often regarded as the target enzyme in chronic obstructive pulmonary disease (COPD), both the neutrophils and macrophages in the lung contain metalloproteinases and both collagen and elastin are degraded in disease. Transgenic studies have shown that when MMP1 is over-expressed, pulmonary emphysema develops in mice, while MMP12 knockout mice do not develop pulmonary emphysema when exposed to cigarette smoke. New drugs that can specifically block active MMPs are now available. These potent inhibitors are effective in vitro and prevent the destruction of tissue in animal models. Future patient trials will test the effectiveness of these compounds in preventing tissue destruction.
Insights
Matrix metalloproteinases (MMPs) degrade connective tissue. Inhibiting MMPs shows promise in preventing tissue breakdown, with new drugs being tested in clinical trials for diseases like COPD.
Area of Science:
- Biochemistry
- Pathology
- Pharmacology
Background:
- Matrix metalloproteinases (MMPs) are enzymes capable of degrading connective tissue.
- Tissue inhibitors of metalloproteinases (TIMPs) regulate MMP activity.
- Imbalances between MMPs and TIMPs contribute to tissue breakdown in various diseases.
Purpose of the Study:
- To investigate the role of MMPs in connective tissue degradation.
- To evaluate the therapeutic potential of MMP inhibitors.
Main Methods:
- Utilized transgenic mouse models to study MMP function in vivo.
- Assessed the efficacy of novel MMP inhibitors in vitro and in animal models.
Main Results:
- MMP1 overexpression led to pulmonary emphysema in mice.
- MMP12 knockout mice were protected from cigarette smoke-induced emphysema.
- Developed MMP inhibitors demonstrated effectiveness in preventing tissue destruction in preclinical studies.
Conclusions:
- MMPs play a significant role in the pathogenesis of diseases involving connective tissue destruction.
- Specific MMP inhibitors are a promising therapeutic strategy for preventing tissue breakdown.
- Further clinical trials are warranted to evaluate the efficacy of these inhibitors in patients.