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Micropatterned dermal-epidermal regeneration matrices create functional niches that enhance epidermal morphogenesis
Amanda L Clement1, Thomas J Moutinho, George D Pins
1Biomedical Engineering Department, Worcester Polytechnic Institute, 100 Institute Road, Worcester, MA 01609, USA; Bioengineering Institute, Worcester Polytechnic Institute, Worcester, MA 01609, USA.
Acta Biomaterialia
|August 21, 2013
Summary
A novel micropatterned dermal-epidermal regeneration matrix (μDERM) enhances skin substitute performance by mimicking natural skin topography. This technology improves epidermal morphology and keratinocyte function for better wound healing and graft take.
Area of Science:
- Biomaterials Science
- Tissue Engineering
- Dermatology
Background:
- Current tissue-engineered skin substitutes face challenges with graft take and stability.
- Existing substitutes lack the dermal-epidermal junction's microtopography, crucial for mechanical stability and cellular function.
- This microtopography supports keratinocyte function, skin appendage formation, and wound healing.
Purpose of the Study:
- To develop and evaluate a novel micropatterned dermal-epidermal regeneration matrix (μDERM).
- To investigate the relationship between topographical geometries and keratinocyte function using a 3-D in vitro model.
- To identify specific microtopographical features that enhance skin regeneration.
Main Methods:
- Development of a novel micropatterned dermal-epidermal regeneration matrix (μDERM).
- Utilized a three-dimensional (3-D) in vitro culture model to assess different topographical geometries.
- Systematically evaluated keratinocyte function in response to varying microtopographies.
Main Results:
- Identified three distinct keratinocyte functional niches: proliferative (narrow), basement membrane protein synthesis (wide), and stem cell (narrow/corners).
- Significantly increased epidermal thickness and keratinocyte proliferation in 50 and 100 μm channels (p<0.05).
- Significantly increased laminin-332 deposition in 400 μm channels (p<0.05) and preferential clustering of putative stem cells in channel geometries.
Conclusions:
- Specific microtopographical geometries can significantly enhance skin regeneration and graft performance.
- The μDERM's microtopography is vital for designing next-generation skin substitutes.
- 3-D organotypic cultures on μDERM offer a novel platform for studying skin morphogenesis, wound healing, and pathology.
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