Microwell Cell Culture Carrier for Uniform Colony Control
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Solution Overview
Problem
Current methods for culturing undifferentiated embryonic stem cells (ES cells) face challenges in maintaining uniform cell colony size and preventing differentiation, particularly during subculture and suspension culture, with existing carriers leading to irregular cell mass formation and mixed populations of differentiated and undifferentiated cells.
Innovation Solution
A carrier with concavities of specific dimensions (10 µm to 1000 µm diameter and 30 µm to 1000 µm depth) on a porous substrate, preferably made of ceramics or glass, allows for controlled cell proliferation and easy exfoliation without enzyme treatment, maintaining the undifferentiated state and enabling efficient subculture and suspension culture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional flat carriers are used for ES cell culture, then cells can proliferate, but the cells form flat colonies and lose their undifferentiated state as they become gigantic
Solution Approach 1:
The invention divides the culture carrier surface into multiple microwells, each with a controlled volume (10nl to 10ul). This segmentation physically confines cell colonies to small, discrete spaces, preventing them from becoming gigantic while maintaining undifferentiated state. Each microwell acts as an independent culture compartment that limits colony size regardless of proliferation extent.
2Ease of operation
If trypsin treatment is used to exfoliate ES cell colonies from the carrier, then cells can be separated for subculture, but the timing of subculture becomes difficult to control and mixed populations of differentiated and undifferentiated cells result
Solution Approach 1:
The microwells are pre-formed with specific dimensions (diameter 100-1000um, depth 50-1000um) that are optimized to contain cell colonies at the desired size. This preliminary structuring of the carrier eliminates the need for timing-based control during culture, as the physical constraints ensure colonies reach the appropriate size for subculture automatically.
3Productivity
If enzyme treatment is used to separate cells from the carrier, then subculture can be performed, but operational complexity and time are increased
Solution Approach 1:
The invention extracts the cell colonies from the microwells by simple aspiration or detachment, eliminating the need for enzyme treatment. The microwell structure allows direct removal of cell-containing medium, leaving cells intact without requiring additional chemical processing steps.
4Quantity of substance
If cells are cultured to large size, then sufficient cell mass is obtained, but differentiation is induced and uniformity is lost
Solution Approach 1:
The invention creates locally optimized microenvironments within each microwell, where the volume and dimensions are specifically designed to maintain undifferentiated state. Each microwell provides a localized culture condition that differs from conventional large-scale culture, enabling uniform colony production with controlled size and composition throughout the entire carrier surface.
Data Source
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AI summary
A colony (cell mass) proliferated under the undifferentiated state is obtained by using a carrier for cell culture in which two or more of a concavity having a porous body in a surface are arranged on a substrate surface in the form of a matrix, inoculating an undifferentiated cell on at least one concavity of the carrier for culture and carrying out culture.