Aptamer Bead Cell Enrichment Without Chemical Agents
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Solution Overview
Problem
Current cell isolation methods for cell therapies, such as those using magnetic beads, result in contaminated cell populations due to residual antibodies, beads, and chemical agents, leading to regulatory challenges and potential side effects, particularly in exogenous cell therapies.
Innovation Solution
Development of devices and methods employing aptamers that specifically bind cell surface markers like CD31, allowing for the enrichment of cells without chemical agents, using beads with mechanical forces to release cells, resulting in a population substantially free of contaminants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If magnetic beads with antibodies are used for cell isolation, then cell separation efficiency is improved, but cell population purity deteriorates due to residual contaminants
Solution Approach 1:
The patent extracts and removes the problematic components (antibodies and magnetic beads) from the cell isolation process by using aptamer-bead conjugates that can be mechanically separated from cells, leaving cells free of residual contaminants while maintaining efficient separation
Solution Approach 2:
The patent replaces the chemical binding mechanism (antibody-antigen interaction) with a mechanical separation system where aptamers are attached to large beads that can be physically removed from cells through filtration or centrifugation, eliminating the need for chemical agents in the final cell product
2Ease of operation
If chemical agents are used for cell release from beads, then cell isolation is achieved, but harmful factors increase due to residual chemicals
Solution Approach 1:
The patent replaces chemical cell release methods with mechanical forces (shear stress, filtration, or centrifugation) to separate cells from aptamer-bead conjugates, eliminating residual chemical agents from the cell product while maintaining effective cell release
Solution Approach 2:
The patent uses large beads as an intermediary carrier that facilitates cell separation through mechanical means rather than chemical agents, allowing cells to be released without exposure to harmful chemicals
3Measurement precision
If antibodies or antibody-labeled beads are used for cell enrichment, then cell selection is improved, but regulatory burden increases due to classification as ATMP
Solution Approach 1:
The patent uses aptamers (nucleic acid molecules) instead of antibodies as the binding agent, creating a disposable, non-protein-based system that does not require complex regulatory approval processes, thereby reducing regulatory burden while maintaining cell selection accuracy
Solution Approach 2:
The patent changes the fundamental parameter of the binding agent from protein-based (antibodies) to nucleic acid-based (aptamers), which alters the regulatory classification and reduces the burden of advanced-therapy medicinal product requirements while preserving cell enrichment capability
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 the isolation of cells with high purity and minimal contamination, suitable for direct administration, reducing regulatory burdens and side effects, and is particularly effective for intraoperative cell therapies like bone fracture treatments.
Implementation Method 1
an aptamer that specifically binds a cell surface marker, e.g., CD31
Implementation Method 2
subjecting the aptamer-coupled beads to a mechanical force sufficient to release the cells with the cell surface marker from the aptamer-coupled beads
Data Source
AI summary
The present invention is directed to a device for enriching cells with a cell surface marker, comprising an aptamer suitable for specifically binding the cell surface marker, and beads coupled thereto, wherein the aptamer is coupled to the beads in a manner that allows for release of cells expressing the cell surface marker, in the absence of a chemical agent, and production of a cell population enriched for cells expressing the cell surface marker, substantially free of beads and aptamer. Kits comprising the device or components thereof, and methods of cell enrichment, are also provided. In exemplary embodiments, the device contains an aptamer that specifically binds CD31.