Polymer-Mediated Cell Aggregation for ECM Loading
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Solution Overview
Problem
Conventional methods for preparing 3D cell tissues fail to effectively utilize extracellular matrix (ECM) for cell aggregation, as soluble ECM in liquid culture media does not contribute significantly to cell aggregation, and existing techniques face cytotoxicity issues when using oil for gelation.
Innovation Solution
A method involving a polymer solution of high concentration (e.g., methylcellulose) where a polymer solution of lower concentration (e.g., Matrigel™) is injected, causing the polymer molecules to accumulate and form a hydrogel or thin layer between cells, allowing efficient ECM loading and cell aggregation without oil, forming polymer-loaded cell aggregates or capsules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If soluble ECM is added to liquid culture media, then ECM is present uniformly in the media, but the most part of ECM is unable to contribute to cell aggregation
Solution Approach 1:
The patent uses a non-adhesive polymer (e.g., methylcellulose, agarose) as an intermediary substance to mediate between the soluble ECM and cells. This non-adhesive polymer creates a microenvironment that allows soluble ECM to be concentrated and organized in a way that facilitates cell aggregation, while the non-adhesive nature prevents the polymer itself from interfering with cell-ECM interactions
Solution Approach 2:
The patent changes the physical parameters of the culture system by introducing a non-adhesive polymer that alters the viscosity and structural organization of the culture media. This parameter change enables soluble ECM to form localized concentrations and structures that promote cell aggregation, transforming the uniform liquid distribution into a structured environment conducive to cell clustering
2Ease of manufacture
If fibronectin and gelatin are coated on cell surfaces, then cells can be assembled as lamination, but this technique depends on integrin molecules and cannot coat all polymers on cell surfaces
Solution Approach 1:
The non-adhesive polymer acts as a universal intermediary platform that can accommodate various types of polymers and ECM components without requiring specific cell surface receptors like integrin. This intermediary approach allows diverse polymer materials to be used in cell aggregation assays without being limited by cell surface molecule compatibility
Solution Approach 2:
The non-adhesive polymer provides a universal platform that serves multiple functions: it maintains cell suspension, allows ECM organization, and is compatible with various polymer types. This universal approach replaces the specific integrin-dependent coating method with a broader, more versatile system that works with different ECM and polymer materials
3Ease of manufacture
If cell-containing ECM solution is mixed with oil for gelation, then ECM gel capsules can be formed, but cytotoxicity is caused by the effect of oil
Solution Approach 1:
The patent extracts and removes the harmful oil component from the gelation process while retaining the essential function of forming ECM gel capsules. By eliminating oil and using alternative gelation methods, the cytotoxic effect is removed while the capsule formation capability is preserved
Solution Approach 2:
The patent converts the potential harm of oil-based gelation into a benefit by developing oil-free gelation methods. The challenge of removing oil led to the development of alternative gelation approaches using physiological buffers and temperature-controlled gelation, which not only eliminate cytotoxicity but also improve cell viability and ECM functionality
4Productivity
If conventional 3D organization methods are used, then cell aggregates can be prepared, but more elaborate techniques are needed for constructing higher value-added 3D tissues
Solution Approach 1:
The patent performs preliminary actions by pre-organizing ECM components and non-adhesive polymers in the culture media before adding cells. This preliminary organization of the microenvironment enables cells to self-assemble into structured 3D tissues with higher complexity and functionality, reducing the need for elaborate post-assembly techniques
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 method enables efficient aggregation of ECM with cells, improving the properties and functions of 3D tissues, reducing cytotoxicity, and allowing for the formation of ECM gel capsules without oil, thereby enhancing cell culture outcomes.
Implementation Method 1
the moisture content of Polymer Solution B was absorbed by Polymer Solution A (to cause its swelling) and the polymer molecules dispersed in Polymer Solution B accumulated in a smaller space
Implementation Method 2
When Polymer Solution B in which desired cells are suspended is injected into Polymer Solution A, the polymer molecules dispersed in Polymer Solution B aggregate together with the cells... When Polymer Solution B is gelatable and has a high concentration, the polymer derived from Polymer Solution B provides a hydrogel to form a relatively thick layer between cells
Data Source
AI summary
The present invention provides a technique for efficiently aggregating a polymer such as ECM together with cells.A method for preparing a polymer-loaded cell or cell aggregate, comprising adding a solution containing a polymer and at least one cell to a medium containing a swellable material to thereby aggregate the polymer together with the cell. A method for controlling the property and/or the function of a cell or a cell aggregate, comprising culturing the polymer-loaded cell or cell aggregate prepared by the above-described method. A method for culturing a cell or a cell aggregate, comprising: preparing a polymer capsule filled with a cell or a cell aggregate by adding a solution containing a polymer and at least one cell to a medium containing a swellable material to thereby aggregate the polymer together with the cell; and culturing the cell or cell aggregate within the capsule.For constructing 3D cell tissues, a method using U-bottom 96-well plates or the hanging-drop method is conventionally used. In the present invention, 2000 cells can be mixed with 1 μl of ECM-containing medium so that ECM and the cells are allowed to aggregate simultaneously. When the efficiency in this case is taken as 1, ECM can only be mixed in 3D cell tissues at a calculated efficiency of approx. 1/12000 in the method using U-bottom 96-well plates or approx. 1/2400 in the hanging drop method. Therefore, according to the present invention, it is possible to reduce the cost of ECM can be reduced to about several thousand to ten thousand times less. Besides, it is possible to efficiently use artificial ECM that cannot be synthesized in a large quantity or rare ECM that can only be extracted in an extremely small quantity for such a reason that the source is a small organism.