Pluripotent Stem Cell State Determination via Culture Medium Metabolite Analysis

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Solution Overview

Problem

Current methods for determining the undifferentiated state of pluripotent stem cells are either destructive, require skilled technicians, or are not fully automated, limiting mass production and quality control in cell culture processes.

Innovation Solution

A non-destructive method analyzing time-dependent changes in specific extracellular metabolites (L-glutamic acid, L-alanine, and ammonia) in the culture medium, allowing for automated evaluation and monitoring of pluripotent stem cell undifferentiation without relying on technician judgment.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If qRT-PCR method or immunostaining method is used to confirm undifferentiated state, then measurement accuracy is improved, but cells are destroyed during measurement

Engineering Contradiction:

Improvemeasurement accuracyVSAvoidcell destruction

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

The patent uses culture medium as an intermediary to indirectly assess cell differentiation state. Instead of directly measuring cells (which causes destruction), the method analyzes metabolites in the culture medium that reflect cell metabolic activity and differentiation status, thereby obtaining measurement information without harming the cells

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent replaces destructive mechanical/biochemical measurement methods (qRT-PCR, immunostaining) with a non-destructive chemical analysis method. By substituting direct cell measurement with culture medium metabolite analysis, the system achieves differentiation state assessment without cell destruction

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Object-affected harmful factors

If flow cytometry method is used for non-destructive measurement, then cell destruction is avoided, but operation complexity increases due to requirement of single cell suspension

Engineering Contradiction:

Improvecell destructionVSAvoidoperation complexity

Core Design Contradiction:

Object-affected harmful factorsVSEase of operation

Solution Approach 1:

The patent extracts the assessment information from the cells by analyzing the culture medium environment rather than manipulating the cells themselves. This eliminates the need for complex cell suspension and single-cell preparation steps required by flow cytometry, while still achieving non-destructive measurement

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

By using culture medium as an intermediary, the method avoids direct cell manipulation entirely. The metabolite analysis in the medium provides differentiation state information without requiring cell suspension or complex preparation procedures

Inventive Principle:

Principle #24Intermediary (Mediator)

3Adaptability or versatility

If technician judgment is used to determine undifferentiated state, then measurement flexibility is maintained, but productivity decreases and quality uniformity cannot be ensured

Engineering Contradiction:

Improvemeasurement flexibilityVSAvoidmass production capability

Core Design Contradiction:

Adaptability or versatilityVSProductivity

Solution Approach 1:

The patent enables the culture medium to 'self-report' cell differentiation status through metabolite composition. This automated self-assessment eliminates reliance on technician judgment, allowing high-throughput screening and mass production while maintaining consistent quality standards through objective metabolite measurements

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The patent replaces subjective technician judgment with objective automated metabolite analysis. This substitution enables high-throughput processing and consistent quality control across large numbers of samples, while the standardized protocol maintains measurement flexibility and adaptability

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

4Object-affected harmful factors

If existing non-invasive methods (Patent Documents 1-2) are used, then cell destruction is avoided, but automation is limited due to requirement of predetermined thresholds or correlation databases

Engineering Contradiction:

Improvecell destructionVSAvoidfull automation capability

Core Design Contradiction:

Object-affected harmful factorsVSExtent of automation

Solution Approach 1:

The patent monitors dynamic changes in metabolite parameters (glutamic acid, alanine, ammonia concentrations) over time rather than relying on static threshold comparisons. This time-dependent parameter tracking enables fully automated assessment of differentiation progression without requiring predetermined thresholds or external databases

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentEP3202911B1Method for determining undifferentiated state of pluripotent stem cells by culture medium analysis

Publication Date: 2023.09.20 TOKYO ELECTRON LTD

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AI summary

There is provided a method for easily determining an undifferentiated state of pluripotent stem cells without relying on the judgment of a skilled technician. The method includes: a step of evaluating an undifferentiated state of pluripotent stem cells based on a time-dependent change in a variation value of an extracellular metabolite contained in a culture medium in which the pluripotent stem cells are cultured, wherein the extracellular metabolite is at least one selected from a group consisting of L-glutamic acid, L-alanine and ammonia.