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Combinatorial Immunophenotyping of Cell Populations with an Electronic Antibody Microarray
Ruxiu Liu1, Chia-Heng Chu1, Ningquan Wang1
1School of Electrical and Computer Engineering, Georgia Institute of Technology, Atlanta, GA, 30332, USA.
Insights
A new microfluidic device enables label-free immunophenotyping for multiple cell targets without complex equipment. This innovation offers accessible cell diagnostics for global health and telemedicine applications.
Area of Science:
- Biomedical Engineering
- Analytical Chemistry
- Cell Biology
Background:
- Immunophenotyping is crucial for research and clinical diagnostics, typically requiring specialized, centralized laboratory equipment.
- Existing methods like flow cytometry are complex and not easily accessible in resource-limited settings.
Purpose of the Study:
- To develop a novel, label-free method for multi-antigen immunophenotyping using microfluidics and electrical sensing.
- To create a cost-effective and accessible diagnostic tool for cell population characterization.
Main Methods:
- Integration of microfluidics with an electrical sensor network to form an antibody microarray.
- Fractionation of samples and capture of target cell subpopulations in microfluidic chambers.
- Electrical quantification of captured cells using code-multiplexed sensors for label-free detection.
Main Results:
- Demonstrated performance by analyzing heterogeneous tumor cell populations.
- Successfully applied the technique to identify leukocyte subpopulations in blood samples.
- Validated results against standard methods like complete blood cell count and flow cytometry.
Conclusions:
- Label-free, multi-target immunophenotyping is achievable on a disposable electronic chip.
- This technology has significant potential for point-of-care diagnostics and telemedicine.
- Offers a pathway to democratize cell-based health monitoring globally.
Abstract:
Immunophenotyping is widely used to characterize cell populations in basic research and to diagnose diseases from surface biomarkers in the clinic. This process usually requires complex instruments such as flow cytometers or fluorescence microscopes, which are typically housed in centralized laboratories. Microfluidics are combined with an integrated electrical sensor network to create an antibody microarray for label-free cell immunophenotyping against multiple antigens. The device works by fractionating the sample via capturing target subpopulations in an array of microfluidic chambers functionalized against different antigens and by electrically quantifying the cell capture statistics through a network of code-multiplexed electrical sensors. Through a combinatorial arrangement of antibody sequences along different microfluidic paths, the device can measure the prevalence of different cell subpopulations in a sample from computational analysis of the electrical output signal. The device performance is characterized by analyzing heterogeneous samples of mixed tumor cell populations and then the technique is applied to determine leukocyte subpopulations in blood samples and the results are validated against complete blood cell count and flow cytometry results. Label-free immunophenotyping of cell populations against multiple targets on a disposable electronic chip presents opportunities in global health and telemedicine applications for cell-based diagnostics and health monitoring.
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