Insoluble Metal Ion Adsorbents for Gentle Cell Aggregate Dissociation
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Solution Overview
Problem
Existing methods for dissociating cell aggregates in cell culture, particularly for pluripotent stem cells, are inefficient and cause damage to cells, requiring multiple steps and centrifugation for dissociation agent removal.
Innovation Solution
Using a water-insoluble metal ion adsorbent, such as a weakly acidic cation exchange resin, to dissociate cell aggregates without centrifugation, allowing for easier and less damaging passage of cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a low molecular weight chelating agent (EDTA) or enzyme is used as a dissociation agent, then cell aggregates can be dissociated into single cells, but the dissociation agent must be removed by centrifugation which causes cell damage and increases process complexity
Solution Approach 1:
The patent changes the physical state parameter of the dissociation agent from soluble (low molecular weight chelating agent) to insoluble (ion exchange resin). This parameter change allows the dissociation agent to be removed by simple filtration or decantation instead of centrifugation, reducing cell damage and process complexity while maintaining dissociation efficiency
Solution Approach 2:
The ion exchange resin is used as a disposable dissociation agent that can be easily discarded after a single use. The resin is added to dissociate cell aggregates, then removed by simple filtration or decantation without requiring complex removal procedures, making the process more efficient and less damaging to cells
2Manufacturing precision
If multiple steps of separating, washing, and removing dissociation agent are performed, then cell aggregates can be dissociated, but the process becomes extremely complicated and time-consuming
Solution Approach 1:
Changing the dissociation agent from soluble to insoluble form allows for simplified removal procedures. The ion exchange resin can be removed by simple filtration or decantation in a single step, eliminating the need for multiple washing and centrifugation steps, thus reducing both process complexity and time consumption
Solution Approach 2:
The insoluble ion exchange resin is easily extracted from the cell suspension through simple filtration or decantation after dissociation. This extraction method requires minimal steps and time compared to centrifugation-based removal of soluble dissociation agents, significantly reducing the overall passaging time
3Quantity of substance
If centrifugation is used to remove the dissociation agent, then the agent can be separated from cells, but cell damage increases and productivity decreases
Solution Approach 1:
The patent changes the dissociation agent from soluble to insoluble, enabling removal by gentle filtration or decantation instead of high-speed centrifugation. This reduces mechanical stress and shear forces on cells, minimizing cell damage and improving cell yield while maintaining effective dissociation
Solution Approach 2:
The disposable ion exchange resin is removed by simple filtration or decantation without requiring centrifugation. This gentle removal method preserves cell integrity and viability, resulting in higher cell yield and reduced cell damage compared to centrifugation-based methods
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
Efficient dissociation of cell aggregates with reduced cell damage, enabling large-scale production of pluripotent stem cells for research and medical applications.
Implementation Method 1
a water-insoluble metal ion adsorbent in a vehicle
Implementation Method 2
the metal ion adsorbent has sedimentation property
Data Source
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AI summary
The present invention aims to provide a method for dissociating cell aggregates, which are formed in cell culture, particularly in the cell passaging step, more easily and with less damage to cells, a method for culturing cells using said method, and a cell aggregate dissociation agent therefor. The present invention relates to a method for dissociating cell aggregates, including subjecting cell aggregates to a treatment with a water-insoluble metal ion adsorbent.