Quantitative flow cytometry leveraging droplet-based constriction microchannels with high reliability and high...

Area of Science:

• Biotechnology
• Analytical Chemistry
• Cell Biology

Background:

• Traditional flow cytometry faces challenges in sensitivity and reliability for single-cell protein quantification.
• Accurate measurement of protein expression at the single-cell level is crucial for understanding cellular heterogeneity and disease mechanisms.

Purpose of the Study:

• To develop a quantitative flow cytometry method using droplet microfluidics for high-sensitivity and high-reliability single-cell protein expression analysis.
• To optimize the method by evaluating different stripping agents and implementing noise reduction techniques.

Main Methods:

• Utilized droplet-based microfluidics with constriction channels for single-cell encapsulation and analysis.
• Compared the efficacy of proteinase K, guanidine hydrochloride, and urea as stripping agents to enhance detection reliability.
• Implemented light modulation and quartz microchannels to mitigate electrical and optical noise, respectively, improving detection sensitivity.

Main Results:

• Quantified mutant p53 expression in A431 and T47D cells, and Ras, c-Myc, and β-tubulin expression in CAL 27 and WSU-HN6 cells with high precision.
• Demonstrated high reliability and sensitivity in single-cell protein quantification using the developed droplet microfluidic platform.
• The method successfully quantified protein expression levels, providing specific numerical data for various proteins in different cell lines.

Conclusions:

• The developed quantitative flow cytometry method based on droplet microfluidics offers a robust tool for single-cell protein expression analysis.
• This methodology provides a novel quantitative perspective for the field of flow cytometry, enabling more precise cellular analysis.
• The system's high sensitivity and reliability make it suitable for various applications in cell biology and diagnostics.