Multi-Source 3D Cell Clusters for Assay Reliability
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Solution Overview
Problem
Three-dimensional (3-D) cell clusters, such as islets, face challenges including non-uniform cell number and composition, high diffusion barriers, incompatibility with high-throughput instruments, and poor scalability, leading to inconsistent responses to test compounds and difficulties in long-term maintenance and storage.
Innovation Solution
The development of multi-source, multi-cell type 3-D clusters formed using micro-molds with divots, where single cells from different sources reaggregate into clusters, allowing for improved diffusion barriers and increased viability through controlled cryopreservation methods, enabling more representative responses to xenobiotic compounds and reduced immunosuppressant requirements in transplantation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional 3-D cell clusters are used, then cell cluster formation is achieved, but non-uniform cell number and composition result in inconsistent responses to test compounds
Solution Approach 1:
The invention segments the cell aggregation process by providing individual wells in a multi-well plate, where each well contains a defined number of cells from multiple donors. This segmentation ensures uniform cell distribution and composition across clusters, resolving the inconsistency in responses to test compounds while maintaining reliable cell cluster formation.
Solution Approach 2:
The invention changes the parameter of cell source composition by using cells from multiple donors mixed in defined ratios rather than single-donor cells. This parameter change ensures uniform cell number and composition across clusters, improving response consistency while maintaining cluster formation capability.
2Quantity of substance
If large islet size is used, then more cells are available, but diffusion barriers prevent sufficient oxygen and glucose transport to core cells
Solution Approach 1:
The invention addresses the diffusion barrier by changing the spatial dimension of cell organization. Instead of forming large dense spheres, cells are distributed in monolayers or thin aggregates within well-defined well volumes, creating a flattened geometry that eliminates diffusion barriers while maintaining high cell numbers through increased surface area utilization.
Solution Approach 2:
The invention applies local quality by creating uniform cell distribution patterns within each well, ensuring that all cells are positioned at optimal distances from the culture medium interface. This local optimization of cell positioning ensures sufficient nutrient and oxygen transport to all cells while maintaining high cell density.
3Productivity
If traditional cell culture methods are used, then cell growth is achieved, but incompatibility with high-throughput instruments limits scalability
Solution Approach 1:
The invention achieves universality by designing a system that functions across multiple scales and instrument types. The multi-well plate format with defined cell numbers per well can be used in both manual culture settings and automated high-throughput instruments, enabling scalability from small-scale research to large-scale production while maintaining compatibility with various instrumentation platforms.
4Duration of action of stationary object
If 3-D clusters are stored without cryopreservation optimization, then storage is achieved, but significant tissue loss occurs
Solution Approach 1:
The invention applies preliminary action by optimizing cryopreservation protocols before storage, including controlled freezing rates and use of cryoprotectants. This preliminary preparation ensures that cells are properly conditioned for freezing, preventing ice crystal formation and maintaining tissue viability during long-term storage while enabling extended storage duration.
Data Source
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AI summary
Described herein are 3-dimensional clusters of reaggregated cells comprising cells reaggregated from at least two different cell sources, such as different cell types, different donors, and combinations thereof. Methods of making, using, and cryopreserving these 3-dimensional clusters of reaggregated cells are also described herein.