Microfluidic Cell Trapping for Single-Cell Proteomics
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Solution Overview
Problem
Current methods for single-cell proteomics face challenges in accurately analyzing protein levels and interactions due to limitations in sample volume handling, contamination risks, and inability to control the number of cells analyzed, leading to inaccurate protein detection and limited multiplexing capabilities.
Innovation Solution
A microfluidic device with a trapping region delimited by valves, including a sieve valve that allows controlled cell trapping and reaction fluid flow for decomposition and analysis, enabling precise control over cell interactions and minimizing contamination, while using mass spectrometry for ultra-sensitive proteomic analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional proteomic sample processing is used, then sufficient protein amounts are available for analysis, but massive dilution and sample loss occur due to large required volumes
Solution Approach 1:
The invention segments the proteomic analysis process into micro-volume stages, processing samples in nanoliter-scale compartments rather than traditional microliter-scale volumes. This segmentation allows maintaining sufficient protein concentration throughout the workflow while minimizing the total sample volume required, thereby reducing dilution and sample loss.
Solution Approach 2:
The invention changes the volume parameter from microliters to nanoliters throughout the processing system. By redesigning lysis chambers, separation channels, and detection zones to operate at nanoliter scales, the system maintains adequate protein amounts for analysis while dramatically reducing the overall sample volume required, thus minimizing dilution effects and sample loss.
2Ease of operation
If open nanowell systems are used for reagent addition, then reagents can be easily introduced, but contamination risk increases due to exposure to environment
Solution Approach 1:
The invention extracts the reagent addition process from the open environment by implementing sealed microfluidic channels and closed lysis chambers. Reagents are introduced through sealed interfaces and microfluidic pathways that prevent environmental exposure, thereby eliminating contamination risks while maintaining ease of operation through automated or pre-loaded reagent delivery systems.
Solution Approach 2:
The invention creates an inert, controlled environment within the microfluidic device by sealing all chambers and channels from the external atmosphere. This closed system prevents environmental contaminants from reaching the sample throughout the entire processing workflow, including during reagent addition, lysis, and separation stages.
3Ease of manufacture
If random cell deposition in nanowells is used, then simple processing is possible, but control over number of cells analyzed is lost
Solution Approach 1:
The invention performs preliminary cell sorting and selection before the main analysis process. Cells are pre-sorted based on size, morphology, or other characteristics using microfluidic sorting mechanisms, ensuring that only desired cell types and numbers enter the analysis chambers. This preliminary action provides precise control over cell number and quality while keeping the subsequent processing steps simple and automated.
Solution Approach 2:
The invention implements feedback control mechanisms that monitor the number and characteristics of cells in each chamber in real-time. Based on this feedback, the system automatically adjusts cell loading, lysis timing, and resource allocation to ensure precise control over the number of cells analyzed, while maintaining simple automated operation throughout the process.
4Ease of operation
If cover plate removal is used for reagent addition, then access to nanowells is possible, but evaporation increases during extended incubation
Solution Approach 1:
The invention extracts the reagent addition function from the open nanowell system by implementing sealed microfluidic channels that deliver reagents directly to reaction chambers through closed pathways. This eliminates the need for cover plate removal entirely, as reagents are introduced through sealed interfaces, thereby preventing evaporation during extended incubation while maintaining ease of operation through automated delivery.
Solution Approach 2:
The invention maintains an inert, sealed environment throughout the entire processing workflow, including during reagent addition and extended incubation. All chambers and channels are hermetically sealed to prevent evaporation, creating a controlled atmosphere that preserves sample integrity and volume throughout the analysis process without requiring cover plate manipulation.
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
This approach allows for controlled, precise analysis of single cells with reduced contamination and increased multiplexing capabilities, enabling the identification of a larger number of proteins and improved understanding of cellular interactions, enhancing the accuracy of single-cell proteomics.
Implementation Method 1
analyzing the collected cell fragments
Implementation Method 2
decomposing the transferred cells into cell fragments through a decomposition process
Data Source
AI summary
In a method for analyzing cells, a sample fluid having a suspending medium and cells is fed to a microfluidic device having at least one cell processing unit having a trapping region, a reaction unit, and an outlet arrangement. The trapping region is delimited by at least an input valve and a sieve valve, in particular a v-type valve that is capable of retaining the cells while letting fluids pass. The method includes trapping cells in the trapping region, subsequently establishing a flow of a reaction fluid through the trapping region while the sieve valve assumes the open state, such that the reaction fluid transfers the trapped cells from the trapping region into the reaction unit, decomposing the transferred cells into cell fragments through a decomposition process, collecting the cell fragments in the outlet arrangement, and analyzing the cell fragments.