Temperature-Responsive Polymer Coated Cell Sheet Detachment
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Solution Overview
Problem
Current treatments for osteoarthritis and cartilage/osseous tissue damage are limited by the use of artificial scaffolds and chemical detachment methods that can cause cell damage and contamination, and existing regenerative techniques are not effective for broad degeneration or defects.
Innovation Solution
A cultured cell sheet with excellent adhesiveness to cartilage or osseous tissue is produced by culturing cells on a temperature-responsive polymer-coated surface, adjusting the culture medium temperature, and detaching the sheet with a carrier to minimize shrinkage and retain basal membrane-like proteins, allowing for high-density cell transplantation and tissue regeneration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If artificial joints containing metals and ultrahigh molecular weight polyethylene are employed, then motor dysfunction treatment is achieved, but the artificial joint wears out within about ten years and causes undesirable biological reactions from abrasive powders
Solution Approach 1:
The invention changes the material parameters from traditional metal-polyethylene combinations to biocompatible materials such as hydroxyapatite, beta-tricalcium phosphate, and other bioactive ceramics that resist wear and promote osseointegration, eliminating abrasive powder generation while maintaining mechanical strength and durability
Solution Approach 2:
The invention employs composite material structures combining metal alloys with biocompatible coatings and ceramic components, creating a multi-layered artificial joint system that provides both mechanical strength and biocompatibility, thereby improving durability while eliminating harmful abrasive reactions
2Adaptability or versatility
If isolated cartilage tissue cells are cultured and transplanted to full-thickness defect, then cartilage regeneration is achieved, but the method cannot be utilized in treatment of osteoarthritis accompanying broad range of partially defective and degenerative cartilage or osseous tissues
Solution Approach 1:
The invention develops a universal treatment platform using mesenchymal stem cells that can differentiate into multiple tissue types (cartilage, bone, fibrous tissue) depending on the local microenvironment, allowing the same cell source to treat various cartilage defects including full-thickness defects, partial defects, and degenerative osteoarthritis across different joint locations
Solution Approach 2:
The invention segments the treatment approach by using different cell sources (articular cartilage-derived chondrocytes, bone marrow-derived mesenchymal stem cells, synovial membrane-derived stem cells) and different delivery methods (cell suspension, cell sheets, scaffold-based delivery) to match specific defect types and locations, thereby expanding applicability while maintaining treatment effectiveness
3Productivity
If chemical agent treatment or proteinase treatment is used to detach cultured cells, then cell harvesting is achieved, but cell degeneration or damage occurs and original function is lost
Solution Approach 1:
The invention replaces chemical detachment methods with temperature-responsive polymer-based mechanical detachment, where the polymer coating on cultureware undergoes reversible conformational changes at specific temperatures to release cells gently without chemical damage, maintaining cell viability and original function while achieving efficient harvesting
Solution Approach 2:
The invention introduces a temperature-responsive polymer coating as an intermediary between the cultureware and cells, which mediates cell attachment and detachment through temperature-induced conformational changes, allowing cells to be harvested without direct exposure to harmful chemical agents
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 method enables the transplantation of highly adhesive cell sheets with high cell density, facilitating early-stage tissue regeneration and broadening treatment options for osteoarthritis and other cartilage/osseous tissue damages, while avoiding the limitations of artificial scaffolds and chemical damage.
Implementation Method 1
adjusting a temperature of the culture medium to a temperature greater than the upper critical solution temperature or less than the lower critical solution temperature
Data Source
AI summary
The problem to be solved by the present invention is to provide a cultured cell sheet that expresses phenotypes of the chondroid tissue. The problems can be solved by producing the cultured cell sheet in which cells are cultured on a surface of a cell cultureware that is coated with a temperature responsive polymer having an upper or lower critical solution temperature ranging from 0° C. to 80° C. in water, including steps of: adjusting the temperature of the culture medium to a temperature below the lower critical solution temperature or above the upper critical solution temperature; bringing the cultured cell sheet in close contact with the carrier; and detaching the cultured cell sheet together with the carrier.