Self-assembling Cell Aggregates for Engineered Tissue
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Solution Overview
Problem
Current tissue engineering methods, including organ printing, face challenges in producing vascularized three-dimensional soft organs with desired structures and stability, as they require a vascular network and have limitations in controlling tissue shape and cell survival during the lengthy incubation periods.
Innovation Solution
The method involves creating uniform cell aggregates that are deposited into a biocompatible matrix, allowing them to fuse and form desired three-dimensional structures through computer-aided simulations predicting optimal interaction forces, reducing the need for individual cell seeding and shortening the time required for tissue maturation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If individual cells are seeded into biodegradable polymer scaffolds using organ printing, then tissue can be constructed layer-by-layer, but the production of vascularized three-dimensional soft organs cannot be achieved and the incubation period becomes excessively long
Solution Approach 1:
The invention prepares cell aggregates with pre-formed three-dimensional structures and appropriate sizes before seeding them into the scaffold. This preliminary preparation of cell aggregates with desired geometries allows them to self-assemble into functional tissue structures more rapidly, reducing the incubation period from weeks to a shorter duration while enabling vascularized organ production
Solution Approach 2:
The invention divides the tissue construction process into discrete cell aggregates that can be independently prepared, seeded, and then self-assemble into the final tissue structure. This segmentation approach allows parallel processing of multiple cell aggregate types (including vascular cells) and enables more efficient tissue formation compared to sequential layer-by-layer construction
2Manufacturing precision
If individual cells are seeded into scaffolds, then tissue can be built, but the structure control and mechanical stability of the resulting tissue cannot be reliably achieved
Solution Approach 1:
The invention pre-forms cell aggregates with specific three-dimensional structures, sizes, and compositions before seeding them into the scaffold. This preliminary structuring of cell aggregates provides inherent mechanical stability and ensures that the cells are already organized in functional configurations, enabling reliable reproduction of target tissue geometries and improving manufacturing precision
Solution Approach 2:
The invention controls key parameters of cell aggregates including size, shape, cell density, and composition to optimize their self-assembly behavior. By adjusting these parameters, the invention achieves reliable control over the final tissue structure, mechanical stability, and functional properties, overcoming the variability associated with individual cell seeding
3Productivity
If individual cells are deposited in a scaffold, then tissue can be formed, but the cells may not survive long enough to sufficiently proliferate and the vascular network cannot be provisioned
Solution Approach 1:
The invention prepares cell aggregates with optimal cell densities, compositions, and pre-formed structures before seeding them into the scaffold. This preliminary preparation ensures that cells are in a more viable state with better survival prospects, and the aggregates can immediately begin functional tissue formation without requiring extensive incubation for basic structure development
Solution Approach 2:
The invention uses segmented cell aggregates that can include different cell types (parenchymal cells, stromal cells, vascular cells) in appropriate ratios and spatial arrangements. This segmentation allows vascular cells to be incorporated into the tissue structure from the beginning, enabling vascular network formation to occur concurrently with tissue growth rather than requiring separate provisioning steps
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 enables the rapid and reliable production of mechanically stable, long-lived three-dimensional organotypic tissue structures, overcoming the limitations of traditional tissue engineering by using cell aggregates that fuse into specific geometries, enhancing cell survival and reducing processing time.
Implementation Method 1
allowing at least one aggregate of said plurality of cell aggregates to fuse with at least one other aggregate of the plurality of cell aggregates to form the desired structure
Data Source
AI summary
A composition comprising a plurality of cell aggregates for use in the production of engineered organotypic tissue by organ printing. A method of making a plurality of cell aggregates comprises centrifuging a cell suspension to form a pellet, extruding the pellet through an orifice, and cutting the extruded pellet into pieces. Apparatus for making cell aggregates comprises an extrusion system and a cutting system. In a method of organ printing, a plurality of cell aggregates are embedded in a polymeric or gel matrix and allowed to fuse to form a desired three-dimensional tissue structure. An intermediate product comprises at least one layer of matrix and a plurality of cell aggregates embedded therein in a predetermined pattern. Modeling methods predict the structural evolution of fusing cell aggregates for combinations of cell type, matrix, and embedding patterns to enable selection of organ printing processes parameters for use in producing an engineered tissue having a desired three-dimensional structure.