Stem Cell Differentiation into Photoreceptor Cells

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Solution Overview

Problem

Current methods for differentiating human embryonic stem cells into photoreceptor cells are inefficient, requiring over 200 days and achieving a low differentiation rate of less than 0.01%, making them unsuitable for clinical applications in treating retinal degeneration.

Innovation Solution

A method involving chemically defined, in vitro conditions similar to in vivo embryonic development, without gene implantation or co-culturing with retinal tissues, to differentiate stem cells into photoreceptor cells and progenitor cells within four weeks, resulting in a 260-fold higher cell population, suitable for clinical transplantation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If conventional methods are used to differentiate human embryonic stem cells into photoreceptor cells, then differentiation can occur, but the process requires over 200 days and achieves a low differentiation rate of less than 0.01%

Engineering Contradiction:

Improvedifferentiation rateVSAvoiddifferentiation time

Core Design Contradiction:

ProductivityVSLoss of time

Solution Approach 1:

The patent applies parameter changes by modifying culture conditions including serum-free media composition, growth factor concentrations, and differentiation induction parameters to achieve high-yield photoreceptor cell differentiation within 4 weeks, transforming the inefficient conventional process into a productive clinical-grade method

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs preliminary action through pre-differentiation culture steps that prepare stem cells for efficient photoreceptor lineage commitment, using optimized serum-free media and growth factor pre-treatment to accelerate subsequent differentiation and achieve high yields in reduced time

Inventive Principle:

Principle #10Preliminary action

2Quantity of substance

If conventional differentiation methods are used, then some photoreceptor cells can be produced, but the yield is insufficient for clinical transplantation requirements

Engineering Contradiction:

Improvecell populationVSAvoiddifferentiation efficiency

Core Design Contradiction:

Quantity of substanceVSProductivity

Solution Approach 1:

The patent implements continuity of useful action through sequential culture stages with optimized media transitions, maintaining continuous differentiation drive from stem cells through retinal progenitor cells to mature photoreceptor cells, achieving 260-fold expansion without culture interruptions or efficiency losses

Inventive Principle:

Principle #20Continuity of useful action

Solution Approach 2:

The patent applies segmentation by dividing the differentiation process into distinct sequential stages with specific media formulations for each phase, allowing optimization of each stage to maximize overall cell yield and differentiation efficiency for clinical transplantation

Inventive Principle:

Principle #1Segmentation

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

The method enables high-yield differentiation of photoreceptor cells within a short period, allowing for successful engraftment and fusion in degenerated retinas, and identifies novel genes and molecules for understanding retinal degeneration and developing therapeutic approaches.

Implementation Method 1

culturing stem cell-derived retinal progenitor cells in a medium containing an IGF1R (insulin-like growth factor-1 receptor) activator, a BMP (bone morphogenetic protein) signaling pathway inhibitor, an FGF (fibroblast growth factor) signaling pathway activator, and a Wnt signalling pathway activator to differentiate them into neural retinal progenitor cells

Methodology Applied

Scientific EffectIGF1R signaling pathway:

Implementation Method 2

Methodology Applied

Scientific EffectBMP signaling pathway:

Implementation Method 3

Methodology Applied

Scientific EffectFGF signaling pathway:

Implementation Method 4

Methodology Applied

Scientific EffectWnt signaling pathway:

Implementation Method 5

culturing the neural retinal progenitor cells in a medium containing an IGF1R activator, a Wnt signaling pathway activator and an Shh (sonic hedgehog) signaling pathway activator to differentiate them into photoreceptor cell precursors

Methodology Applied

Scientific EffectIGF1R signaling pathway:

Implementation Method 6

Methodology Applied

Scientific EffectWnt signaling pathway:

Implementation Method 7

Methodology Applied

Scientific EffectShh signaling pathway:

Implementation Method 8

culturing the photoreceptor cell precursors in a medium containing an IGF1R activator, a Wnt singaling pathway activator, an Shh signaling pathway activator and RA (retinoic acid) to differentiate them into retinal cells including photoreceptor cells

Methodology Applied

Scientific EffectIGF1R signaling pathway:

Implementation Method 9

Methodology Applied

Scientific EffectWnt signaling pathway:

Implementation Method 10

Methodology Applied

Scientific EffectShh signaling pathway:

Implementation Method 11

Methodology Applied

Scientific EffectRA (retinoic acid):

Data Source

PatentEP2486126B1Method for differentiation into retinal cells from stem cells

Publication Date: 2017.12.06 SEOUL NATIONAL UNIVERSITY R&DB FOUNDATION

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AI summary

Disclosed is a method for inducing stem cells to differentiate into retinal cells at high yield within a short period of time, without gene implantation and co-culture with retinal tissues, by implementing a differentiation process similar to the in vivo embryonic development in chemically defined conditions. Also, retinal cells including the photoreceptor cells and their progenitor cells, and various types of other retinal cells, generated according to the method, are disclosed. A composition comprising the retinal cells and a method are provided for treating retinal degeneration-related diseases. The differentiated photoreceptor cells, when transplanted into degenerated or injured retinas, can be engrafted and fused within the retinas to prevent or cure retinal degeneration.