Biomimetic Coating for Rare Cell Capture in Microfluidic Channels
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Solution Overview
Problem
Current technologies are inadequate for efficiently capturing and maintaining the viability of rare circulating tumor cells and clusters from blood samples due to low flow rates and inefficiencies in cell capture, leading to prolonged processing times and compromised cell integrity.
Innovation Solution
A biomimetic coating with cell adhesion and capture molecules immobilized on a dissolvable alginate hydrogel matrix is used in a microfluidic device, allowing for efficient capture and maintenance of rare cells at higher flow rates, utilizing specific surface markers like CD44 and CD38 to retain cells while allowing other cells to pass through.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing technologies are used to isolate circulating tumor cells, then cell isolation can be achieved, but cell viability and cell cluster integrity are compromised
Solution Approach 1:
The patent uses a composite coating system comprising a hydrogel matrix (e.g., alginate, gelatin, or hyaluronic acid) embedded with cell adhesion molecules (such as fibronectin, laminin, or collagen) and cell capture molecules (such as antibodies or aptamers). This composite structure provides both mechanical support and biological functionality, enabling efficient cell capture while maintaining cell viability through the biomimetic environment the hydrogel creates.
2Measurement precision
If antibody-based capture is used, then specific cell targeting is achieved, but capture efficiency is reduced due to small surface-area to volume ratios of cell clusters
Solution Approach 1:
The patent combines multiple capture mechanisms into a single integrated coating system. Cell capture molecules (antibodies or aptamers) provide specific targeting, while cell adhesion molecules (fibronectin, laminin, collagen) provide non-specific adhesion support. This merging of specific and non-specific capture mechanisms overcomes the limitation of antibody-only capture for cell clusters with small surface-area to volume ratios.
3Reliability
If rapid processing of large sample volumes is performed, then cell preservation is improved, but capture efficiency decreases due to fast flow rates
Solution Approach 1:
The patent applies preliminary action by pre-coating the microfluidic channel surface with a biomimetic hydrogel layer containing both cell adhesion and capture molecules before sample introduction. This pre-prepared coating creates an optimized capture environment that immediately engages with circulating tumor cells upon sample flow, enabling efficient capture even at fast flow rates and allowing rapid processing of large sample volumes while preserving cell viability.
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 method enables rapid processing of large blood samples, maintaining cell viability and efficiency, allowing for the isolation of rare cells and clusters within one hour, which is crucial for cancer diagnosis and therapeutic targeting.
Implementation Method 1
a dissolvable matrix wherein the plurality of cell adhesion molecules and the plurality of cell capture molecules are modified to attach to the dissolvable matrix. The dissolvable matrix can be attached to a surface. The dissolvable matrix can be alginate an hydrogel.
Implementation Method 2
The plurality of cell adhesion molecules can be modified with a plurality of biotin molecules to attach to a plurality of streptavidin molecules on the dissolvable matrix. The plurality of cell capture molecules can be modified with a plurality of biotin molecules to attach to a plurality of streptavidin molecules on the dissolvable matrix.
Implementation Method 3
The dissolvable matrix can be dissolved by a chelating agent, enzyme, or combination thereof. The chelating agent can EDTA, EGTA, or sodium citrate.
Data Source
AI summary
Disclosed herein is a biomimetic coating for use in a microfluidic channel to capture rare cells from a sample while maintaining the viability of the captured cells.