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A Microfluidic Chip for the Versatile Chemical Analysis of Single Cells
Published on: October 15, 2013
Microfluidic cell surface antigen expression analysis using a single antibody type
1Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, TX 79409, USA. d.pappas@ttu.edu.
Insights
This study presents a microfluidic chip for cell separation based on antigen expression differences. The novel affinity capture method achieves high purity, aiding in cell analysis and disease monitoring.
Area of Science:
- Biotechnology
- Cell Biology
- Analytical Chemistry
Background:
- Antigen expression is crucial for disease diagnosis, monitoring, and cell phenotype analysis.
- Distinguishing cells based on subtle antigen expression differences presents a challenge in biological and clinical studies.
Purpose of the Study:
- To develop an affinity capture method for isolating cells based on differential antigen expression using a single microfluidic chip.
- To quantify antigen expression differences between cell populations with high specificity and efficiency.
Main Methods:
- Designed a microfluidic chip with dual affinity regions utilizing varying antibody concentrations for differential cell capture.
- Employed herringbone-modified capture channels to enhance cell-surface interactions under continuous-flow conditions.
- Validated the method by analyzing Ramos B lymphocytes and HuT 78 T lymphocytes and spiking cells into blood samples.
Main Results:
- Achieved 95% separation purity and 15% capture efficiency in microfluidic chip experiments.
- Demonstrated a strong correlation (R^2 = 0.94) between cell capture ratios and CD71 antigen expression levels.
- Validated performance in complex blood samples, showing consistent expression ratio measurements and 9.5x sample enrichment.
Conclusions:
- The developed microfluidic affinity capture system robustly measures antigen expression differences between cells.
- This method enables the distinction of cells even without unique surface antigens, provided sufficient expression level differences.
- The technology offers a valuable tool for cell analysis in clinical studies, pathology, and biological research.
Abstract:
Antigen expression plays a significant role in clinical studies, pathology, biology and chemistry. The type and degree of antigen expression can provide information for disease diagnosis/monitoring and is used for phenotype analysis of cells. In this work, an affinity capture method was developed to capture cells based on antigen expression differences in a single microfluidic chip. Microfluidic chips with two affinity regions-at different antibody concentrations-captured two cell types based on differences in the expression of a single antigen. Using herringbone-modified capture channels, a separation purity of 95% and a capture efficiency of 15% were achieved under continuous-flow conditions. We observed that the capture ratio of Ramos B lymphocytes and HuT 78 T lymphocytes matched the expression ratio of CD71 for the two cell lines (R(2) = 0.94). To further validate our analytical method, Ramos B lymphocytes were spiked into blood samples to demonstrate performance with a complex sample. Expression ratios matched conventional flow cytometry measurements over a 40-fold difference, and the sample enrichment was 9.5×. This method has proven to be a robust system to measure the differences in antigen expression, and can be used to distinguish cells without having a unique surface antigen if the expression level is sufficiently high in one cell type.
