Telencephalon Aggregate Culture via Oxygen Partial Pressure Control

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Solution Overview

Problem

Current methods for inducing differentiation of pluripotent stem cells into mature telencephalon or progenitor tissues in vitro are limited in their ability to replicate the complex structural and axial polarity of human cerebral cortex development, particularly in forming specific neural regions and maintaining long-term cultures with accurate positional relationships.

Innovation Solution

A method involving the optimization of culture conditions to induce self-organization of three-dimensional cerebral cortex structures, using Wnt signal inhibitors and TGFβ signal inhibitors, along with high oxygen partial pressure and specific signaling factors, to achieve selective differentiation of telencephalon marker-positive aggregates into cerebral cortical tissues, basal ganglion, hippocampus, and choroid plexus, while maintaining dorsal-ventral and anterior-posterior polarity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If nonselective differentiation method with rotation culture in spinner flask is used, then brain regions can be stochastically obtained, but the structural complexity and axial polarity of human cerebral cortex development cannot be accurately replicated

Engineering Contradiction:

Improveability to obtain various brain regionsVSAvoidaccuracy of positional relationships and axial polarity

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

The patent applies local quality by creating distinct microenvironmental zones within the aggregate culture system. Different regions of the aggregate experience different oxygen partial pressures (high at periphery, low at core) and signaling factor concentrations, which drives spatially restricted differentiation into specific brain regions with correct axial polarity. This allows simultaneous generation of multiple brain regions while maintaining accurate positional relationships.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent utilizes parameter changes by systematically varying oxygen partial pressure and signaling factor concentrations to control differentiation outcomes. By adjusting these parameters, the method can selectively induce different telencephalic structures (cortex, basal ganglia, hippocampus) while preserving the complex multilayered architecture and axial polarity characteristic of human cerebral cortex development.

Inventive Principle:

Principle #35Parameter changes

2Duration of action of moving object

If conventional culture conditions are used, then short-term culture is possible, but long-term maintenance of telencephalon structures with accurate architectural features cannot be achieved

Engineering Contradiction:

Improveculture durationVSAvoidarchitectural accuracy of telencephalon structures

Core Design Contradiction:

Duration of action of moving objectVSManufacturing precision

Solution Approach 1:

The patent applies preliminary action by establishing optimal culture conditions (high oxygen partial pressure, specific signaling factors) before initiating long-term culture. This pre-optimization enables the aggregate to maintain telencephalon-specific gene expression and architectural features throughout extended culture periods, preventing differentiation drift and structural degradation that occur in conventional systems.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements continuity of useful action by maintaining constant high oxygen partial pressure and appropriate signaling factor levels throughout long-term culture. This continuous provision of optimal conditions sustains the differentiated telencephalon structures and their architectural accuracy over extended periods, enabling long-term study and manipulation of human cerebral cortex development in vitro.

Inventive Principle:

Principle #20Continuity of useful action

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 method allows for the selective induction of telencephalon or progenitor tissues with a multilayered structure consistent with human second-trimester cerebral cortex development, enabling long-term maintenance and self-organization of adjacent tissues like cerebral cortex, basal ganglion, and hippocampus, and the specific induction of outer radial glial cells.

Implementation Method 1

culturing an aggregate of pluripotent stem cells in suspension in the presence of a Wnt signal inhibitor and a TGFβ signal inhibitor

Methodology Applied

Scientific EffectSignal transduction:

Implementation Method 2

further culturing the telencephalon marker-positive aggregate in suspension under a high oxygen partial pressure condition

Methodology Applied

Scientific EffectOxygen diffusion: Diffusion

Data Source

PatentUS11198850B2Method for manufacturing telencephalon or progenitor tissue thereof

Publication Date: 2021.12.14 RIKEN CO LTD

AI summary

The present invention provides a method of producing more mature telencephalon or a progenitor tissue thereof, in vitro, from mammalian pluripotent stem cells, comprising obtaining a telencephalon marker-positive aggregate by culturing an aggregate of pluripotent stem cells in suspension in the presence of a Wnt signal inhibitor and a TGFβ signal inhibitor, and further culturing the telencephalon marker-positive aggregate in suspension under a high oxygen partial pressure condition. In one embodiment, the suspension culture under a high oxygen partial pressure condition is performed in the presence of a Wnt signal enhancer and a bone morphogenetic factor signal transduction pathway activating substance.