Visualizing protease activity in living cells: from two dimensions to four dimensions

Area of Science:

• Cell Biology
• Biochemistry
• Biophysics

Background:

• Proteolytic degradation of extracellular matrix (ECM) is crucial for cell growth, remodeling, and migration.
• Analyzing ECM degradation is vital for understanding developmental biology and diseases such as cancer.

Purpose of the Study:

• To describe an in vitro live cell-based method for imaging and quantifying ECM degradation.
• To provide a tool for assessing proteolytic activity in real-time.

Main Methods:

• Utilizing fluorescent dye-quenched protein substrates (DQ-gelatin, DQ-collagen I, DQ-collagen IV) mixed with protein matrices.
• Culturing cells in the presence of these substrates to detect fluorescence release upon proteolytic cleavage.
• Employing confocal microscopy and advanced imaging software for quantitative 3D and 4D analysis of proteolysis.

Main Results:

• Demonstrated a method to directly measure ECM degradation by live cells.
• Enabled quantitative assessment of proteolytic activity through fluorescence detection.
• Facilitated 3D and 4D imaging and measurement of ECM degradation.

Conclusions:

• The described method offers a valuable tool for studying ECM degradation in various biological contexts.
• This technique can be applied to investigate developmental processes and pathological conditions involving matrix remodeling.
• Live cell imaging of ECM proteolysis provides direct insights into cellular metabolic activities.