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Updated: Jun 21, 2026
FRET Microscopy for Real-time Monitoring of Signaling Events in Live Cells Using Unimolecular Biosensors
Published on: August 20, 2012
Membrane-bound FRET probe visualizes MMP12 activity in pulmonary inflammation
Amanda Cobos-Correa1, Johanna B Trojanek, Stefanie Diemer
1[1] Cell Biology and Biophysics Unit, European Molecular Biology Laboratory, Heidelberg, Germany. [2] Molecular Medicine Partnership Unit, European Molecular Biology Laboratory and University of Heidelberg, Heidelberg, Germany.
Researchers developed LaRee1, a novel reporter, to detect matrix metalloproteinase-12 (MMP12) activity in lung inflammation. This FRET-based sensor shows promise for monitoring pulmonary diseases by tracking MMP12 in macrophages.
Area of Science:
- Biochemistry
- Molecular Biology
- Immunology
Background:
- Matrix metalloproteinase-12 (MMP12) is a key enzyme involved in inflammatory processes.
- Existing methods for monitoring MMP12 activity are limited in their ability to track real-time cellular events.
- Developing specific and sensitive reporters is crucial for understanding MMP12's role in disease.
Purpose of the Study:
- To synthesize and validate a novel membrane-targeted reporter, LaRee1, for monitoring MMP12 activity.
- To assess the utility of LaRee1 in a mouse model of pulmonary inflammation.
- To investigate the potential of LaRee1 as a diagnostic tool for lung diseases.
Main Methods:
- Synthesis of LaRee1, a Förster resonance energy transfer (FRET)-based reporter.
- Characterization of LaRee1's response to MMP12 activity, including loss of FRET and lipidated fragment internalization.
- Application of LaRee1 in bronchoalveolar lavages from a mouse model of pulmonary inflammation.
- Detection of MMP12 activity on the surface of activated macrophages.
Main Results:
- LaRee1 successfully detected MMP12 activity through a dual mechanism: loss of FRET and internalization of the reporter.
- MMP12 activity was specifically identified at the surface of activated macrophages in bronchoalveolar lavages.
- The reporter demonstrated sensitivity and specificity in a relevant disease model.
Conclusions:
- LaRee1 is a novel and effective tool for detecting MMP12 activity.
- The reporter's ability to monitor MMP12 on activated macrophages offers insights into lung inflammation.
- LaRee1 holds significant potential for the advancement of lung disease monitoring and diagnostics.
