Renal Progenitor Cell Differentiation via Adherent Culture and Stage-Specific Media

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Solution Overview

Problem

Current methods for differentiating human induced pluripotent stem (iPS) cells or human embryonic stem (ES) cells into nephron progenitor cells have low efficiency and unclear stage reproduction, limiting their application in kidney regeneration, disease modeling, and therapeutic agent development.

Innovation Solution

A method involving adherent culture of intermediate mesodermal cells in a medium containing a GSK-3β inhibitor and FGF9, specifically using CHIR99021 and laminin 511 E8 fragment, to induce renal progenitor cells that are SIX2-positive and OSR1-positive, with additional steps involving BMP and TGFβ inhibitors, effectively reproducing developmental stages for efficient differentiation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If embryoid body (EB) method is used for differentiation induction, then differentiation can be achieved, but differentiation induction efficiency is low

Engineering Contradiction:

Improvedifferentiation induction efficiencyVSAvoiddifferentiation efficiency

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The invention changes the culture parameters from suspension culture (EB method) to adherent culture, and modifies the medium composition by adding specific factors (FGF2, FGF9, BMP4, BMP7, CHIR99021, A83-01, Y-27632) to improve differentiation induction efficiency from less than 80% to at least 80%

Inventive Principle:

Principle #35Parameter changes

2Manufacturing precision

If conventional differentiation methods are used, then differentiation process can be completed, but accurate reproduction of developmental stages is unclear

Engineering Contradiction:

Improveaccuracy of developmental stage reproductionVSAvoidclarity of stage reproduction

Core Design Contradiction:

Manufacturing precisionVSLoss of information

Solution Approach 1:

The invention segments the differentiation process into distinct stages (primitive streak formation, mesoderm differentiation, intermediate mesoderm formation, renal progenitor cell differentiation) with specific culture conditions for each stage, allowing accurate reproduction and identification of developmental stages

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The invention uses stage-specific marker expression (BRACHYURY, MIXL1, OSR1, SIX2) as feedback to monitor and confirm accurate reproduction of developmental stages, enabling verification of each differentiation step

Inventive Principle:

Principle #23Feedback

3Productivity

If simple culture methods are used, then ease of operation is maintained, but differentiation induction efficiency is low

Engineering Contradiction:

Improvedifferentiation induction efficiencyVSAvoidculture method complexity

Core Design Contradiction:

ProductivityVSEase of operation

Solution Approach 1:

The invention performs preliminary actions by pre-preparing stage-specific culture media with optimized compositions and adding appropriate growth factors and inhibitors before each differentiation stage, ensuring high efficiency without requiring complex real-time adjustments during culture

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS20240043811A1Method of producing a mesodermal-lineage primitive streak cell

Publication Date: 2024.02.08 KYOTO UNIV

AI summary

A method of producing a mesodermal-lineage primitive streak cell includes a first step of culturing pluripotent stem cells in a medium containing FGF2, BMP (bone morphogenetic protein) 4, a GSK-3β inhibitor, and retinoic acid or a derivative thereof and a second step of culturing cells obtained in the first step in a medium containing FGF2, a GSK-3β inhibitor, and BMP7.