Cell Culture Substrate with Temperature-Responsive Block Polymer
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Solution Overview
Problem
Current cell culture substrates face challenges in efficiently culturing animal cells and detaching them without enzymatic treatment, due to insufficient water resistance and cell detachability issues, particularly with temperature-responsive polymers.
Innovation Solution
A cell culture substrate incorporating a block polymer with a segment having a lower critical solution temperature and a hydrophobic segment, where the segment's degree of polymerization ranges from 400 to 10,000, enhancing both cell adhesion and water resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a temperature-responsive polymer is immobilized on the substrate surface to enable enzymatic-free cell detachment, then cell detachability is improved, but water resistance becomes insufficient causing polymer elution
Solution Approach 1:
The patent employs a block copolymer composed of a temperature-responsive polymer segment (PNIPAM) and a hydrophobic polymer segment (polystyrene). This composite structure allows the temperature-responsive segment to provide cell detachability while the hydrophobic segment anchors the polymer to the substrate, preventing elution and ensuring water resistance. The synergistic combination resolves the contradiction between detachability and water resistance.
Solution Approach 2:
The block copolymer structure creates local functional differentiation: the PNIPAM segment at the surface provides temperature-responsive cell detachment functionality, while the polystyrene segment embedded in the substrate provides stable anchoring and water resistance. This spatial separation of functions resolves the contradiction by assigning different properties to different parts of the same material system.
2Device complexity
If a block copolymer with water-insoluble and temperature-responsive segments is used to avoid large-scale apparatuses, then device complexity is reduced, but cell detachability becomes insufficient
Solution Approach 1:
The patent optimizes the degree of polymerization of the PNIPAM segment to 400-10,000, which is critical for achieving both sufficient cell detachability and maintaining simplicity. This parameter optimization ensures that the temperature-responsive segment has adequate molecular weight for effective cell detachment while keeping the overall system simple and avoiding complex apparatus requirements.
3Strength
If the degree of polymerization of the temperature-responsive segment is increased to improve cell adhesion, then cell adhesion is enhanced, but water resistance decreases due to polymer elution
Solution Approach 1:
The block copolymer structure resolves this contradiction by combining the PNIPAM segment (degree of polymerization 400-10,000) for cell adhesion with the hydrophobic polystyrene segment for water resistance. The optimized PNIPAM length provides sufficient cell adhesion strength while the polystyrene anchor prevents elution, maintaining water resistance even at higher polymerization degrees.
Solution Approach 2:
The functional differentiation within the block copolymer allows the PNIPAM segment to be optimized for cell adhesion (higher degree of polymerization) while the polystyrene segment handles water resistance. This local quality assignment resolves the contradiction by allowing each segment to optimize its function independently.
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 configuration allows for high-efficiency cell culture and easy detachment of cells in a living condition, balancing adhesiveness and water resistance.
Implementation Method 1
a segment having a lower critical solution temperature and a hydrophobic segment, in which the segment having a lower critical solution temperature has a degree of polymerization of 400 to 10,000
Data Source
AI summary
The present invention is to provide a cell culture substrate including a block polymer including a segment having a lower critical solution temperature and a hydrophobic segment, in which the segment having a lower critical solution temperature has a degree of polymerization of 400 to 10,000. Also provided is a cell culture substrate, in which the hydrophobic segment is obtainable by polymerizing a monomer having a particular structure. Also provided is a cell culture substrate being laminated on a supporting medium. Furthermore, a cell culture substrate having an average film thickness of 1,000 nm or less is provided.