Microfluidic Chip for CTC Separation and Single-Cell Western Blotting
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Solution Overview
Problem
Current methods for circulating tumor cell (CTC) separation and analysis are limited by low sensitivity, specificity, and the inability to detect protein expression at a single-cell level, particularly due to issues with antibody cross-reactivity and the need for large sample sizes, which hinders the understanding of CTC heterogeneity and its role in cancer metastasis and treatment.
Innovation Solution
A microfluidic chip with a channel for CTC separation and a gel layer for single-cell lysis and western blotting, allowing for label-free, high-throughput separation and analysis of CTCs, incorporating a filter membrane for purification and an electric field for electrophoresis, enabling quantitative analysis of target proteins in individual cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional CTC separation methods are used, then CTCs can be isolated from blood samples, but the sensitivity and specificity are low due to inability to detect protein expression at single-cell level and antibody cross-reactivity issues
Solution Approach 1:
The method segments the CTC analysis process into distinct functional modules: separation module using microfluidics, lysis module for cell breakdown, and detection module for protein analysis. This segmentation allows each module to be optimized independently, achieving high sensitivity and specificity through specialized functions while managing overall system complexity.
Solution Approach 2:
The western blotting detection system serves multiple functions: it detects target proteins with high specificity, quantifies protein expression levels, and identifies CTCs through unique protein signatures. This multi-functionality replaces multiple separate detection methods, improving measurement precision while consolidating device complexity.
2Quantity of substance
If large sample sizes are used for CTC analysis, then sufficient material for analysis is obtained, but the ability to detect heterogeneity among individual CTCs is lost
Solution Approach 1:
The microfluidic system automatically processes individual CTCs through the entire workflow from separation to lysis to detection without manual intervention. Each CTC is handled independently through the system, enabling single-cell resolution analysis that preserves heterogeneity information while requiring minimal initial sample volume.
Solution Approach 2:
The method replaces traditional mechanical bulk processing with microfluidic-based single-cell manipulation. Instead of processing large samples collectively through mechanical means, the system uses controlled fluid flow at the micro-scale to isolate and analyze individual CTCs, preserving their unique characteristics and heterogeneity information.
3Productivity
If rapid CTC separation is implemented, then analysis time is reduced, but separation purity may be compromised
Solution Approach 1:
The system uses hydrodynamic forces and pressure gradients in the microfluidic channels to rapidly separate CTCs from blood cells based on size and density differences. The controlled fluid flow enables fast separation while maintaining high purity through precise hydraulic control of the separation process.
Solution Approach 2:
The separation process utilizes changes in flow rate, pressure, and channel geometry parameters to optimize both speed and purity. By dynamically adjusting these parameters during the separation process, the system achieves rapid CTC isolation while maintaining high purification efficiency.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The microfluidic chip facilitates rapid, sensitive, and stable separation and analysis of CTCs, providing high-purity and high-throughput results without affecting cell activity, enabling detailed protein expression analysis and improved understanding of CTC heterogeneity.
Implementation Method 1
separation based on inertial force
Implementation Method 2
separation based on inertial force and Dean drag
Implementation Method 3
incorporating a filter membrane for purification
Implementation Method 4
use an electric field to separate the protein molecule of the single cell through electrophoresis
Data Source
AI summary
A microfluidic chip comprises: a first unit which has a channel for a cell sample to pass through and is configured to separate circulating tumor cells in the cell sample; a second unit, a front end of which communicates with a tail end of the first unit, and the second unit is configured to capture single cells from the separated circulating tumor cells and subject the captured single cells to closed lysis; and a gel layer which is provided at the second unit. The microfluidic chip is configured to implement the binding of a protein molecule of the single cell with an antibody in the gel layer after the single cell is lysed. A cell separation and western blotting method using the microfluidic chip comprises: lysing circulating tumor cells, capturing, and implementing the binding of a lysate with an antibody. A manufacture method of the microfluidic chip, comprises: manufacturing a first interlayer and a separation unit; manufacturing a second interlayer and pasting the second interlayer on a basal layer, and manufacturing a single-cell capture unit; and bonding the first interlayer with the separation unit and the second interlayer with the single-cell capture unit.