Dual Stimuli Responsive Copolymer Cell Culture Support
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Solution Overview
Problem
Conventional cell culture methods, such as mechanical scraping and trypsinization, can cause adverse effects on cells and are impractical for industrial-scale applications, particularly for delicate cells like stem cells, due to their harsh nature and potential for introducing impurities.
Innovation Solution
Development of dual stimuli responsive copolymer-coated cell culture supports that are both thermoresponsive and pH responsive, allowing for gentle cell attachment and efficient release by altering temperature and pH, thereby minimizing cell damage and maintaining cell integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional mechanical scraping or trypsinization is used for cell release, then cell detachment efficiency is improved, but cell integrity and purity deteriorate due to harsh treatment and potential impurities
Solution Approach 1:
The invention changes the physical-chemical parameters of the cell culture support surface by using thermoresponsive polymers that undergo phase transition at specific temperatures. Below LCST, the polymer surface is hydrophilic and supports cell adhesion; above LCST, it becomes hydrophobic and triggers cell release, enabling gentle detachment without harsh chemicals or mechanical scraping
Solution Approach 2:
The invention exploits the phase transition of thermoresponsive polymers (sol-to-gel transition) at the lower critical solution temperature (LCST). When temperature rises above LCST, the polymer collapses from a hydrated sol state to a dehydrated gel state, causing cells to detach gently from the surface, thereby achieving efficient release while maintaining cell integrity
2Ease of operation
If animal-derived trypsin is used for cell release, then cell detachment is achieved, but product purity deteriorates due to impurities like co-fractionated proteins, viruses, and mycoplasma
Solution Approach 1:
The invention replaces chemical/enzymatic cell release methods with a physical stimulus-responsive mechanism. The thermoresponsive polymer coating responds to temperature changes through physical phase transition, eliminating the need for animal-derived enzymes and their associated impurities, thereby ensuring high product purity for therapeutic applications
Solution Approach 2:
The thermoresponsive polymer acts as an intermediary between the cell culture support and the cells. It mediates cell attachment and release through temperature-controlled conformational changes, providing a controlled and impurity-free release mechanism that avoids direct contact with harsh reagents
3Device complexity
If single-stimulus responsive polymers are used, then device complexity is reduced, but adaptability deteriorates because they cannot respond to multiple environmental conditions
Solution Approach 1:
The invention merges multiple stimulus-responsive functionalities into a single copolymer system. The dual stimuli-responsive copolymer contains both thermoresponsive moieties (for temperature response) and pH-responsive moieties (for pH response), allowing the coating to adapt to different environmental conditions while maintaining a unified structure that does not significantly increase complexity
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
The dual stimuli responsive copolymer-coated cell culture supports enable efficient cell adhesion, growth, and release with high yield, suitable for industrial-scale applications, particularly for delicate cells, while avoiding the harshness of conventional methods and potential impurities.
Implementation Method 1
TRPs undergo a sol-to-gel transition when the temperature is raised above lower critical solution temperature (LCST). When the TRP is above its LCST, it forms a collapsed gel or precipitated phase, on which cells can adhere and proliferate. Lowering the temperature of the cell culture system below the LCST stimulates a physical change (swelling/hydration) in the TRP and imparts greater hydrophilicity, which causes a triggered release of the cultured cells.
Implementation Method 2
The dual stimuli responsive copolymer is both thermoresponsive and pH responsive
Implementation Method 3
a dual stimuli responsive copolymer immobilized on the substrate via non-covalent interaction
Data Source
AI summary
A cell culture support comprising a substrate, and a dual stimuli responsive block copolymer immobilized on the substrate, wherein the dual stimuli responsive block copolymer is both thermoresponsive and pH responsive. A method of culturing cells comprising the cell culture support having a dual stimuli responsive copolymer immobilized on a substrate, wherein the dual stimuli responsive copolymer is thermoresponsive and pH responsive; and growing the cells on the cell culture support. By lowering the temperature, cells are released from the cell culture support.