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Following matrix metalloproteinases activity near the cell boundary by infrared micro-spectroscopy
Silvina Federman1, Lisa M Miller, Irit Sagi
1Department of Structural Biology, The Weizmann Institute of Science, 76100, Rehovot, Israel.
Abstract:
Matrix Metalloproteinases (MMPs) are cell-secreted soluble and membrane-tethered enzymes that degrade extracellular matrix (ECM) proteins. These proteases play a key role in diverse physiological and pathological processes, including embryonic development, wound repair, inflammatory diseases and cancer. Yet, there is insufficient knowledge on the mode by which cell-produced MMPs conduct their action on the ECM. Specifically, the localization and the mode of the degradation within the pericellular space are of great interest. To provide new insights to these questions we utilized Fourier transform infrared (FTIR) micro-spectroscopy to follow proteolytic processes, induced by invasive cancer cells, on insoluble collagen-based matrices. Here we show that FTIR micro-spectroscopy have a great potential for monitoring degradation events near cells. Using this tool we demonstrate that the net proteolysis is unevenly distributed around the cell boundary. The degradation patterns show different levels of proteolytic activity by MMPs within the pericellular space. In addition, our spectral analysis suggests that the enzymatic proteolysis of the collagen-based matrices induces unwinding of the triple helical structures of the macromolecules within the collagen network.
Insights
Matrix Metalloproteinases (MMPs) degrade extracellular matrix proteins. This study uses FTIR micro-spectroscopy to reveal uneven MMP degradation patterns around cancer cells, showing collagen unwinding.
Area of Science:
- Biochemistry
- Cell Biology
- Biophysics
Background:
- Matrix Metalloproteinases (MMPs) are crucial enzymes involved in extracellular matrix (ECM) remodeling during physiological and pathological processes.
- Understanding the spatial distribution and mechanisms of MMP-mediated ECM degradation, particularly in the pericellular space, remains a significant challenge.
Purpose of the Study:
- To investigate the localization and mode of action of cell-secreted MMPs on collagenous matrices using advanced spectroscopic techniques.
- To gain novel insights into the pericellular proteolytic microenvironment associated with invasive cancer cells.
Main Methods:
- Utilized Fourier Transform Infrared (FTIR) micro-spectroscopy to monitor proteolytic degradation of insoluble collagen-based matrices.
- Applied FTIR micro-spectroscopy to analyze degradation events in close proximity to invasive cancer cells.
Main Results:
- FTIR micro-spectroscopy effectively monitored degradation events occurring near cells, demonstrating its potential for studying pericellular proteolysis.
- Observed that net proteolysis by MMPs is unevenly distributed around the cell boundary, indicating localized enzymatic activity.
- Spectral analysis revealed that MMP-induced proteolysis causes unwinding of the triple helical structure within the collagen network.
Conclusions:
- FTIR micro-spectroscopy is a powerful tool for visualizing and quantifying pericellular ECM degradation by MMPs.
- Cancer cell-associated MMPs exhibit spatially heterogeneous proteolytic activity within the pericellular space.
- The degradation mechanism involves the unwinding of collagen triple helices, altering matrix structure.