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MT1-MMP on the cell surface causes focal degradation of gelatin films
M P d'Ortho1, H Stanton, M Butler
1INSERM U296, Faculté de Médecine, Créteil, France.
Abstract:
The membrane-type matrix metalloproteinases (MT-MMPs) are a subclass of the matrix metalloproteinase (MMP) family which uniquely possess a C-terminal transmembrane domain and are initiators of an activation cascade for progelatinase A (MMP-2). Recent studies have shown that they can also efficiently directly degrade a number of matrix macromolecules. We now show that cells expressing MT1-MMP on their cell surfaces cause subjacent proteolysis of a gelatin film and that this proteolysis is inhibited by TIMP-2 but not by TIMP-1. These data indicate that expression of MT1-MMP on the cell surface may lead to both progelatinase A activation and extracellular matrix degradation.
Insights
Membrane-type matrix metalloproteinases (MT-MMPs), like MT1-MMP, initiate matrix degradation and progelatinase A activation. Cell surface MT1-MMP expression causes gelatin proteolysis, inhibited by TIMP-2, highlighting its role in extracellular matrix remodeling.
Area of Science:
- Biochemistry
- Cell Biology
- Molecular Biology
Background:
- Membrane-type matrix metalloproteinases (MT-MMPs) are a distinct subclass of MMPs.
- MT-MMPs feature a transmembrane domain and initiate progelatinase A (MMP-2) activation.
- Emerging evidence suggests MT-MMPs directly degrade matrix macromolecules.
Purpose of the Study:
- To investigate the cell surface activity of MT1-MMP.
- To determine if MT1-MMP mediates extracellular matrix degradation.
- To assess the role of TIMP-1 and TIMP-2 in MT1-MMP-mediated proteolysis.
Main Methods:
- Utilized cells engineered to express MT1-MMP on their surface.
- Assessed proteolysis of a gelatin film substrate.
- Evaluated the inhibitory effects of TIMP-1 and TIMP-2.
Main Results:
- Cells expressing MT1-MMP demonstrated significant proteolysis of the gelatin film.
- This MT1-MMP-induced proteolysis was effectively inhibited by TIMP-2.
- TIMP-1 did not inhibit the observed proteolysis.
Conclusions:
- Cell surface expression of MT1-MMP directly contributes to extracellular matrix degradation.
- MT1-MMP plays a dual role in activating progelatinase A and degrading matrix components.
- TIMP-2 is a specific inhibitor of MT1-MMP-mediated matrix degradation.