Laminous Vascular Scaffolds Using Cell Sheet Engineering
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Solution Overview
Problem
Current vascular grafts face challenges in achieving uniform and effective endothelialization and smooth muscle cell layer formation, leading to suboptimal structural and physiological integrity, particularly for small-diameter blood vessels, due to difficulties in cell seeding and maintaining cell viability and function.
Innovation Solution
The development of laminous vascular scaffolds combining electrospun matrices with cell sheet technologies, where smooth muscle cells are cultured to form mature layers and applied to electrospun scaffolds, and preconditioned in a bioreactor to enhance cell-to-cell communication and structural integrity, using temperature-responsive substrates and pulsatile bioreactor systems to mimic physiological conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional smooth muscle cell seeding techniques are used, then the vascular scaffold can be constructed, but uniform and effective cell layer formation is difficult to achieve
Solution Approach 1:
The patent applies preliminary action by pre-culturing smooth muscle cells into mature layers on temperature-responsive substrates before applying them to the electrospun scaffold. This pre-organization of cells into functional layers resolves the seeding uniformity issue, as the cells are already arranged in their target configuration before scaffold application.
Solution Approach 2:
The patent uses temperature-responsive substrate as an intermediary medium to cultivate and organize smooth muscle cells into mature layers. This intermediary allows cells to be pre-differentiated and structured in a controlled environment before transfer to the final scaffold, achieving uniform cell layer formation that direct seeding cannot accomplish.
2Reliability
If electrospun matrix alone is used as vascular scaffold, then the scaffold structure is formed, but uniform and effective cell infiltration is challenging
Solution Approach 1:
The patent applies preliminary action by pre-culturing smooth muscle cells into mature layers on temperature-responsive substrates before applying them to the electrospun scaffold. This pre-organization of cells into functional layers resolves the seeding uniformity issue, as the cells are already arranged in their target configuration before scaffold application.
Solution Approach 2:
The patent uses temperature-responsive substrate as an intermediary medium to cultivate and organize smooth muscle cells into mature layers. This intermediary allows cells to be pre-differentiated and structured in a controlled environment before transfer to the final scaffold, achieving uniform cell layer formation that direct seeding cannot accomplish.
3Reliability
If cell sheet engineering is combined with electrospinning, then mature smooth muscle layers with strong cell-to-cell junctions are achieved, but the fabrication process becomes more complex
Solution Approach 1:
The patent applies preliminary action by pre-culturing smooth muscle cells into mature layers on temperature-responsive substrates before applying them to the electrospun scaffold. This pre-organization of cells into functional layers resolves the seeding uniformity issue, as the cells are already arranged in their target configuration before scaffold application.
Solution Approach 2:
The patent uses temperature-responsive substrate as an intermediary medium to cultivate and organize smooth muscle cells into mature layers. This intermediary allows cells to be pre-differentiated and structured in a controlled environment before transfer to the final scaffold, achieving uniform cell layer formation that direct seeding cannot accomplish.
4Reliability
If permanent prosthetic vascular graft materials are used, then vascular reconstruction is achieved, but lifetime risk of thrombosis and infection increases
Solution Approach 1:
The patent applies parameter changes by transitioning from permanent synthetic materials to bioengineered tissue with living cells. The vascular graft is constructed with autologous endothelial cells and smooth muscle cells organized in physiologically relevant layers, changing the fundamental material parameter from inert polymer to living tissue that can actively prevent thrombosis and infection.
Solution Approach 2:
The patent uses composite materials by combining electrospun biocompatible matrix with living cell layers. The final construct integrates synthetic scaffold material with biological tissue components, creating a composite structure that combines the mechanical strength of electrospun fibers with the physiological functionality of living cells.
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 approach results in vascular constructs with improved cell seeding efficiency, viability, and phenotypic expression, maintaining structural integrity and mechanical stability, capable of withstanding physiological forces and promoting long-term patency.
Implementation Method 1
At 37° C., the surface becomes hydrophobic and cells can readily attach and proliferate on the surface. At 20° C., the surface of the PIPAAm-grafted dish becomes hydrophilic and the cell monolayer can be detached from the surface.
Implementation Method 2
an electrospun matrix allows for endothelial cell (EC) adhesion onto the luminal surface and homogenous infiltration of smooth muscle cells (SMC) into the outer layer
Data Source
AI summary
Vascular scaffolds and methods of fabricating the same are disclosed for tissue engineering of vascular constructs. By combining electrospun matrices with cell sheet technologies, vascular constructs with more mature cell layers can be obtained for reconstruction of blood vessels, heart valves and the like. A engineered smooth muscle cell sheet, wrapped around an electrospun vascular scaffold, is able to provide a mature SMC layer that expresses strong cell-to-cell junction markers and contractile proteins. In addition, preconditioning of the cell sheet covered vascular scaffold maintained cell viability and infiltration into the scaffold.