Liver Microtissue Encapsulation for Liver Failure Treatment

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Solution Overview

Problem

Current methods for producing liver microtissue from induced pluripotent stem cells are complex, costly, and difficult to scale up, limiting their effectiveness in treating liver failure due to poor cellular diversity and integration issues.

Innovation Solution

A three-dimensional liver microtissue comprising at least three different phenotypes of liver cells, including immature and mature hepatocytes, cholangiocytes, and mesenchymal stem cells, encapsulated in a single closed microcompartment, which mimics the liver microenvironment for improved integration and function.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If current methods for producing liver microtissue from induced pluripotent stem cells are used, then liver cells can be generated, but the production process is complex and costly

Engineering Contradiction:

Improveliver cell productionVSAvoidproduction process complexity

Core Design Contradiction:

Quantity of substanceVSDevice complexity

Solution Approach 1:

The production process is segmented into distinct functional modules: stem cell expansion in microcompartments, differentiation induction through specific culture conditions, and microtissue formation. This segmentation allows each step to be optimized independently, reducing overall process complexity while maintaining high cell production quantities.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent utilizes parameter changes in culture conditions (growth factors, cytokines, oxygen levels) to control cell differentiation from pluripotent stem cells to specific liver phenotypes. By systematically adjusting these parameters, the complex differentiation process is simplified into a controlled multi-stage protocol that efficiently produces diverse liver cell types.

Inventive Principle:

Principle #35Parameter changes

2Quantity of substance

If current methods are used, then liver cells can be produced, but production cost is high

Engineering Contradiction:

Improveliver cell productionVSAvoidproduction cost

Core Design Contradiction:

Quantity of substanceVSEase of manufacture

Solution Approach 1:

The microcompartment system enables self-service through automated microenvironment control and self-organized cell differentiation. The enclosed microenvironment automatically provides appropriate conditions for cell growth and differentiation without requiring extensive manual intervention or expensive specialized equipment, thereby reducing production costs while maintaining high cell yields.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The patent develops a universal microcompartment platform that can produce multiple liver cell phenotypes (hepatocytes, cholangiocytes, stellate cells) from a single stem cell source using the same basic system. This multi-functionality eliminates the need for separate production lines for different cell types, significantly reducing overall production costs.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Quantity of substance

If current methods are used, then liver cells can be generated, but cellular diversity is poor

Engineering Contradiction:

Improveliver cell generationVSAvoidcellular diversity

Core Design Contradiction:

Quantity of substanceVSAdaptability or versatility

Solution Approach 1:

The patent implements dynamic culture conditions within the microcompartments, transitioning from pluripotent state to differentiated liver cell states through time-dependent exposure to differentiation factors. This dynamic approach enables the generation of multiple cell phenotypes with distinct functional characteristics, achieving high cellular diversity while maintaining efficient production.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

Different regions within the microcompartment are designed with local quality variations in terms of growth factor concentration, oxygen tension, and substrate composition. These spatial variations create distinct microenvironments that promote the differentiation of specific cell types, thereby enhancing cellular diversity without compromising overall production efficiency.

Inventive Principle:

Principle #3Local quality

4Quantity of substance

If current methods are used, then liver cells can be produced, but integration into host liver is poor

Engineering Contradiction:

Improveliver cell productionVSAvoidintegration into host liver

Core Design Contradiction:

Quantity of substanceVSReliability

Solution Approach 1:

The patent applies preliminary action by pre-differentiating stem cells into specific liver phenotypes with mature functional characteristics before transplantation. The microcompartment system pre-organizes cells with appropriate morphology, cell-cell interactions, and extracellular matrix composition that mimic the native liver environment, thereby enhancing integration reliability upon implantation in the host liver.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS20230355683A1Liver microtissue for treating liver failure

Publication Date: 2023.11.09 TREEFROG THERAPEUTICS

AI summary

The invention relates to a liver microtissue, preferably a liver microtissue comprising at least 3 different phenotypes of liver cells obtained from induced pluripotent stem cells encapsulated in a single three-dimensional closed microcompartment. The invention also relates to a method for preparing the liver microtissue and its uses in treatment or prevention of liver failure.