Bioengineered Tissue Grafts Using Pluripotent Stem Cell Subunits
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Solution Overview
Problem
Bioengineering complex tissues with multiple components is challenging due to the need for multiple cell types, stable tissue interfaces, and maintaining distinct structural and functional properties, which existing methods struggle to replicate effectively, especially in simulating the structural zonal organization and functional mechanical properties of native tissues.
Innovation Solution
A flexible and scalable method involving pluripotent or multipotent cells, encapsulated in biomaterials like collagen, are differentiated into functional subunits and combined to form bioengineered complex tissues that mimic native tissues in terms of structural irregularity and heterogeneity, using microencapsulation, differentiation culture media, mechanical loading, and interactions with differentiated progenies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple cell types from different tissue components are used, then the functional characteristics of complex tissues are improved, but the sourcing complexity and invasiveness increase significantly
Solution Approach 1:
The patent uses pluripotent stem cells as a universal cell source that can differentiate into multiple cell types (osteogenic, chondrogenic, etc.) required for complex tissues. This single cell source replaces the need for multiple specialized cell sources, reducing sourcing complexity while maintaining functional characteristics.
Solution Approach 2:
The patent segments the complex tissue engineering process into distinct functional subunits (osteogenic subunit, chondrogenic subunit, etc.), each engineered separately from pluripotent stem cells and then assembled. This segmentation allows independent optimization of each tissue component while using a common cell source.
2Quantity of substance
If multiple biopsies from different tissue components are performed, then multiple cell types are obtained, but the invasiveness and clinical feasibility decrease
Solution Approach 1:
Instead of performing multiple biopsies to obtain different cell types, the patent uses a single biopsy of pluripotent stem cells that can be differentiated in vitro into all required cell types. This eliminates the need for multiple invasive procedures while providing sufficient quantities of diverse cell types.
3Reliability
If stable tissue interfaces are engineered, then the functional integrity of complex tissues is improved, but the manufacturing complexity increases
Solution Approach 1:
The patent pre-engineers functional subunits with their specific extracellular matrix and cellular architecture before assembly. The interfaces between subunits are prepared in advance with appropriate attachment proteins and structural features, making the final assembly process more straightforward while ensuring functional integrity.
Solution Approach 2:
The patent applies different extracellular matrix components and structural features to specific regions (osteogenic regions, chondrogenic regions, and their interfaces) to create locally optimized tissue interfaces. This local differentiation of material properties ensures proper interface formation without requiring complex global manufacturing processes.
4Manufacturing precision
If distinct structural and functional properties are maintained for each tissue component, then the native tissue characteristics are better replicated, but the culture conditions become more complicated
Solution Approach 1:
The patent separates the culture process into distinct stages for each functional subunit, with specialized culture conditions applied only during the differentiation phase of each cell type. Once subunits are formed, they can be assembled and co-cultured under more uniform conditions, reducing overall complexity while maintaining structural precision.
Solution Approach 2:
The patent uses controlled changes in culture parameters (growth factors, medium composition, mechanical stimulation) to direct differentiation of pluripotent stem cells into specific cell types. These parameter changes are applied in a temporal sequence that simplifies the overall culture process while achieving precise structural organization.
Data Source
AI summary
A simple, highly flexible and scalable platform for making functional complex tissues with heterogeneity and irregularity is provided. The method includes combining undifferentiated cells, such as pluripotent or multipotent stem cells, with a biomaterial to make multiple undifferentiated or naïve subunits, exposing the undifferentiated or naïve subunits to different cell culture environments for induction of differentiation towards different lineages as required by that complex tissue, and combining the then functional subunits with or without the undifferentiated subunits. The differentiated subunits thus combined can be cultured under biological, chemical, and/or physical culture conditions suitable to fine-tune the structural and functional properties of the bioengineered complex tissue to form a bioengineered tissue graft that mimics the structural and functional characteristics of native complex tissue. The bioengineered tissue graft can then used to replace dysfunctional tissue.