Mesenchymal Stem Cell Hydrogel Sheets for Epidermolysis Bullosa Healing
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Solution Overview
Problem
Current dressing agents for epidermolysis bullosa do not effectively promote skin regeneration without causing irritation and do not increase the expression of collagen type VII and laminin-5, which are crucial for wound healing.
Innovation Solution
A composition and sheet containing high-active mesenchymal stem cells attached to a biodegradable or nondegradable support using a hydrogel, which includes fibrin glue, hyaluronic acid, or other hydrogels, and supports like poly-gamma-glutamic acid (PGA), poly lactic acid (PLA), and sterilized nonwoven fabrics, to enhance the expression of collagen type VII and laminin-5.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional dressing agents are applied to epidermolysis bullosa wounds, then wound coverage and basic protection are provided, but skin regeneration is not effectively promoted and irritation occurs
Solution Approach 1:
The patent introduces mesenchymal stem cells as an intermediary biological agent that mediates between the wound environment and the healing process. These stem cells are suspended in hydrogel and applied to the wound, where they actively promote skin regeneration through paracrine signaling and differentiation, while the hydrogel provides a protective, non-irritating matrix that facilitates cell delivery and survival.
Solution Approach 2:
The patent changes the biological activity parameters of the dressing by incorporating living mesenchymal stem cells that can dynamically respond to the wound environment. The stem cells alter the biochemical parameters of the wound microenvironment through secreted growth factors and cytokines, transforming a passive dressing into an active regenerative system that promotes collagen type VII and laminin-5 expression without causing irritation.
2Reliability
If stem cells are applied directly to wounds, then skin regeneration is promoted, but cell survival rate decreases due to freezing and thawing damage
Solution Approach 1:
The hydrogel serves as a protective intermediary matrix that encapsulates the mesenchymal stem cells during freezing and thawing processes. This hydrogel cushioning system reduces mechanical stress and ice crystal formation damage to the cells, maintaining high cell survival rates (95% or more) after cryopreservation while preserving the stem cells' regenerative capabilities for promoting skin healing.
Solution Approach 2:
The patent applies beforehand cushioning by suspending mesenchymal stem cells in a hydrogel matrix before freezing. This hydrogel provides a protective environment that cushions the cells during cryopreservation, preventing direct ice crystal contact and reducing thermal shock, thereby maintaining high cell viability after thawing and application to the wound.
3Quantity of substance
If current dressing agents are used, then wound coverage is achieved, but expression of collagen type VII and laminin-5 is not increased
Solution Approach 1:
The patent uses mesenchymal stem cells as biological intermediaries that naturally secrete collagen type VII and laminin-5, the crucial proteins needed for wound healing in epidermolysis bullosa. These stem cells act as living factories that produce and deposit the required extracellular matrix components at the wound site, increasing the quantity of these substances without requiring complex external delivery systems.
Solution Approach 2:
The mesenchymal stem cells in the dressing perform self-service by autonomously differentiating and secreting collagen type VII and laminin-5 at the wound site. The cells self-organize and self-regulate their protein production based on local wound conditions, eliminating the need for complex external control mechanisms while achieving high expression of the required healing proteins.
4Quantity of substance
If stem cells are cultured extensively before application, then cell quantity is increased, but cell activity and viability decrease
Solution Approach 1:
The patent applies preliminary action by culturing mesenchymal stem cells to sufficient quantity before application, but performs this culturing in a controlled manner using optimized culture conditions and appropriate timing. The cells are prepared in advance with proper maintenance of their biological activity, ensuring they retain high viability and regenerative capacity when applied to the wound, thus achieving both adequate cell quantity and sustained cell activity.
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 composition significantly increases the expression of collagen type VII and laminin-5, promoting skin reproduction and re-epithelization, with the stem cells surviving up to 95% after freezing and thawing, and reducing inflammation without immune response, thereby effectively treating epidermolysis bullosa.
Implementation Method 1
containing high-active living mesenchymal stem cells which are attached and cultured to a biodegradable or nondegradable support by suspending the cultured mesenchymal stem cells in a hydrogel
Implementation Method 2
a biodegradable or nondegradable support
Data Source
AI summary
Provided are a composition and a sheet, including a mesenchymal stem cells-hydrogel-biodegradable support or a mesenchymal stem cells-hydrogel-nondegradable support and a preparing method thereof. More specifically, in the sheet including a mesenchymal stem cells-hydrogel-biodegradable support or a mesenchymal stem cells-hydrogel-nondegradable support according to the present invention, the high-active mesenchymal stem cells may be applied to a wounded part of a patient with epidermolysis bullosa as it is without isolation using proteases, and in the culturing, an extracellular matrix such as collagen, laminin, fibronectin, and elastin secreted from the mesenchymal stem cells is wholly present on the hydrogel to have an advantageous effect that skin reproduction and re-epithelization abilities are significantly excellent as compared with conventional dressing agents used for epidermolysis bullosa.