Single-cell proteolytic activity measurement using microfluidics for rare cell populations.

Area of Science:

• Biomedical Engineering
• Cancer Biology
• Cellular Proteolysis

Background:

• Extracellular matrix degradation by proteases is vital for cancer metastasis.
• Previous methods measured average proteolytic activity, masking single-cell variations.
• Evidence suggests a subset of cancer cells drives metastasis, necessitating single-cell analysis.

Purpose of the Study:

• To develop a microfluidic platform for high-efficiency single-cell proteolytic activity analysis.
• To characterize proteolytic activity in small cell populations (10-100 cells).
• To investigate the dynamics of proteolytic activity at the single-cell level.

Main Methods:

• Development of a microfluidic device with high-efficiency cell loading and valveless isolation.
• Utilizing fluorescent sensing substrates to probe cellular proteolytic activity.
• Monitoring proteolytic activity of individual cells over multiple time points.

Main Results:

• The platform enables individual characterization of proteolytic activity in small numbers of cancer cells.
• It allows for the dynamic monitoring of proteolytic activity in single cells.
• The study highlights the heterogeneity and dynamic nature of cancer cell proteolytic activity.

Conclusions:

• The developed microfluidic platform is a simple and reliable tool for single-cell proteolytic analysis.
• This approach is valuable for studying cancer cell heterogeneity and dynamics.
• Understanding single-cell proteolytic activity can provide insights into cancer dissemination and metastasis.