Sheet-Shaped Cell Culture Purity via Low Nutrient Soaking
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Solution Overview
Problem
Current methods for producing sheet-shaped cell cultures are limited in modifying the cell composition after the culture is formed, particularly in increasing the purity of desired cells, which is crucial for regenerative therapies to minimize rejection reactions.
Innovation Solution
A method involving soaking the formed sheet-shaped cell culture in a low nutrient isotonic solution, such as Hanks' balanced salt solution, to modify the content ratio of cell types, specifically reducing fibroblasts and increasing the purity of skeletal myoblasts, by maintaining the culture in a low nutrient environment for 24 to 150 hours at 2° C. to 8° C.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If autologous cells are used to produce sheet-shaped cell culture, then rejection reactions are reduced, but cell purity of desired cell types cannot be completely removed
Solution Approach 1:
The patent applies preliminary action by performing selective removal of unwanted cell types (fibroblasts) from the sheet-shaped cell culture before transplantation. This is achieved by exposing the culture to conditions that cause fibroblasts to detach or die while preserving the desired cell types (skeletal myoblasts), thereby improving cell purity prior to the transplantation procedure.
Solution Approach 2:
The patent employs the extraction principle by specifically removing fibroblasts from the mixed cell population in the sheet-shaped culture. This is accomplished through selective detachment methods that extract unwanted cell types while retaining the therapeutic cell types, thus resolving the contradiction between maintaining autologous cell composition and achieving high cell purity.
2Manufacturing precision
If sheet-shaped cell culture is produced with high initial purity, then transplantation quality is improved, but modification of cell composition after formation is not possible
Solution Approach 1:
The patent applies dynamics by introducing a post-formation modification step that dynamically changes the cell composition of the sheet-shaped culture. After the culture is initially formed, it can be treated with specific agents or conditions that selectively remove unwanted cell types, thereby dynamically adjusting the purity and composition to optimize it for transplantation.
Solution Approach 2:
The patent performs preliminary purification actions after culture formation by exposing the sheet-shaped culture to conditions that selectively remove fibroblasts. This post-formation purification step ensures high cell purity is achieved even though the initial culture contained mixed cell types, resolving the contradiction between initial composition and final purity.
3Ease of manufacture
If conventional culture methods are used, then cell culture formation is straightforward, but cell composition cannot be modified after sheet formation
Solution Approach 1:
The patent segments the cell culture process into distinct phases: initial culture formation phase and post-formation modification phase. The first phase uses conventional straightforward methods to form the sheet-shaped culture, while the second phase introduces selective modification steps to adjust cell composition. This segmentation allows both ease of manufacture and adaptability to be achieved.
Solution Approach 2:
The patent performs preliminary culture formation using conventional methods, then subsequently applies modification treatments to adjust cell composition. This two-stage approach with preliminary formation followed by selective modification enables both simple initial production and flexible post-formation adaptation.
Data Source
AI summary
A method is disclosed for modifying a sheet-shaped cell culture containing at least two types of cells. The method includes soaking the sheet-shaped cell culture in a low nutrient isotonic solution; and changing a content ratio of the at least two cell types constituting the sheet-shaped cell culture.