Tissue-Engineered Bowel Constructs Using Aligned Smooth Muscle
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Solution Overview
Problem
There is a need for functional tissue-engineered bowel and sphincteric constructs for repairing and reconstructing damaged gastrointestinal structures, as well as for developing therapeutic interventions and drug testing, due to the limitations of existing treatments for intestinal failure and sphincter dysfunction.
Innovation Solution
The development of three-dimensional, bioengineered tubular bowel and gut-sphincter complexes using intestinal circular smooth muscle cells and enteric neural progenitor cells co-cultured in a collagen/laminin gel, seeded on molds with specific surface textures to induce alignment, and wrapped around tubular scaffolds made of chitosan or collagen, allowing for implantation into the intestinal system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If intestinal transplantation is performed to treat intestinal failure, then gut function can be restored, but the procedure has high mortality rate and depends on donor availability
Solution Approach 1:
The patent creates tissue-engineered bowel constructs that copy the structure and function of native intestinal tissue. These constructs are grown from patient-derived cells in vitro, providing a renewable source of functional bowel tissue that eliminates dependence on donor availability while restoring gut function.
Solution Approach 2:
The patent transforms the treatment approach by changing the source parameter from donor-derived tissue to patient-derived engineered tissue. This parameter change enables unlimited availability while maintaining functional reliability through controlled laboratory cultivation of intestinal tissue.
2Quantity of substance
If total parenteral nutrition is used for intestinal failure, then nutritional needs are met, but patients develop liver disease, catheter occlusion, and infection
Solution Approach 1:
The tissue-engineered bowel constructs perform self-service by naturally executing digestive and absorptive functions. The engineered tissue contains functional epithelial cells that absorb nutrients and smooth muscle cells that provide motility, eliminating the need for external nutritional support systems and their associated complications.
Solution Approach 2:
The patent replaces the mechanical catheter-based nutrition delivery system with a biological absorption system. Instead of using catheters to deliver nutrients directly to the bloodstream, the engineered bowel naturally absorbs nutrients through its epithelial cells, eliminating catheter-related complications.
3Reliability
If tissue-engineered constructs are created with multiple cell types, then functional integrity is improved, but manufacturing complexity increases
Solution Approach 1:
The patent merges multiple cell types including epithelial cells, smooth muscle cells, and neural cells into a single integrated tissue construct. These different cell types self-organize during cultivation to form the complex architecture of native bowel, achieving functional integrity without proportionally increasing manufacturing complexity.
Solution Approach 2:
The patent segments the complex task of creating functional bowel tissue into manageable components: epithelial cell culture, smooth muscle cell culture, and neural cell culture. These segmented cell populations are then combined and co-cultured to form the complete functional construct, making the manufacturing process more tractable.
4Reliability
If smooth muscle cells are aligned directionally in the construct, then motility function is improved, but alignment precision requirements increase
Solution Approach 1:
The patent changes the manufacturing approach from mechanical alignment to biochemical guidance. By modifying the substrate parameters (coating with extracellular matrix proteins like laminin and collagen) and growth condition parameters (adding alignment-inducing factors to the culture medium), smooth muscle cells self-align directionally without requiring precise mechanical positioning.
Solution Approach 2:
The smooth muscle cells perform self-alignment through their inherent responsiveness to biochemical cues in the culture environment. The cells autonomously orient themselves along the direction of extracellular matrix fibers and growth factors, eliminating the need for external alignment apparatus or complex positioning procedures.
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 resulting tissue-engineered constructs exhibit directionally oriented smooth muscle cells, basal tone, and choleric contractions, maintaining functional integrity and vascularization, providing a promising therapeutic approach for restoring gut continuity and motility.
Implementation Method 1
seeding the isolated intestinal circular smooth muscle cells on a mold with a surface texture that induces longitudinal alignment of the intestinal smooth muscle cells
Implementation Method 2
co-cultured in a collagen/laminin gel
Data Source
AI summary
Methods are disclosed for forming tissue engineered, tubular bowel constructs from intestinal circular smooth muscle cells and enteric neural progenitor cells. The intestinal smooth muscle cells and neural progenitor cells can be seeded on a mold with a surface texture that induces longitudinal alignment of the intestinal smooth muscle cells and co-cultured until an innervated aligned smooth muscle sheet is obtained. The innervated smooth muscle sheet can then be wrapped around a tubular scaffold to form an intestinal tissue construct.