Sulfated Compound Stabilizes FGF in Stem Cell Culture

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Solution Overview

Problem

Current stem cell culture media using fibroblast growth factor (FGF) face challenges with FGF stability and cost due to its high expense and low stability, necessitating frequent medium exchanges, and there is a need for compounds that can protect FGF from degradation and promote stem cell growth.

Innovation Solution

A medium for stem cell proliferation containing FGF and a sulfated compound, such as sulfated saccharides or sulfated polymers, at specific concentrations to stabilize FGF and promote stem cell growth, reducing the frequency of medium exchanges and lowering culture costs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If FGF is added to the medium to promote stem cell growth, then stem cell proliferation is enhanced, but FGF shows low stability and requires frequent medium exchange

Engineering Contradiction:

Improvestem cell proliferation rateVSAvoidFGF stability in medium

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent introduces sulfated polysaccharides (heparin, dextran sulfate, carrageenan) as intermediary substances that bind to FGF and protect it from degradation. These mediators stabilize FGF in the culture medium, preventing its rapid breakdown while maintaining its biological activity for stem cell proliferation.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent changes the chemical composition parameters of the culture medium by adding specific sulfated polysaccharides at optimized concentrations. This parameter modification creates a protective chemical environment that extends FGF stability without compromising its proliferative effects on stem cells.

Inventive Principle:

Principle #35Parameter changes

2Productivity

If FGF is added to the medium to promote stem cell growth, then stem cell proliferation is enhanced, but culture costs increase due to high FGF expense and frequent medium exchange

Engineering Contradiction:

Improvestem cell proliferation rateVSAvoidculture medium cost

Core Design Contradiction:

ProductivityVSLoss of substance

Solution Approach 1:

By using sulfated polysaccharides as protective intermediaries, the patent reduces FGF degradation and extends its effective duration in the medium. This decreases the frequency of medium exchanges required, thereby reducing the overall consumption and cost of FGF in the culture process.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent employs relatively inexpensive sulfated polysaccharides (such as dextran sulfate and carrageenan) as stable protective agents that can remain in the medium for extended periods. These long-lasting, low-cost substances replace the need for frequent addition of expensive FGF, achieving cost reduction while maintaining productivity.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Productivity

If serum is used in the culture medium to support stem cell growth, then cell proliferation is maintained, but xeno-derived components pose infection risks and cause inconsistent results

Engineering Contradiction:

Improvestem cell proliferationVSAvoidinfection risk from xeno-derived components

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent extracts and eliminates serum components from the culture medium, replacing them with chemically defined sulfated polysaccharides. This removal of xeno-derived serum eliminates the source of blood-borne pathogens and heterogeneous antigens while maintaining the necessary protective and proliferative functions through synthetic alternatives.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent transitions from a complex, variable serum-based medium to a chemically defined medium with controlled parameters. By precisely defining the composition and concentration of sulfated polysaccharides, the patent achieves consistent, reproducible results while eliminating the variability and contamination risks associated with serum batches.

Inventive Principle:

Principle #35Parameter changes

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 use of sulfated compounds effectively stabilizes FGF, promoting stem cell growth and reducing the need for frequent medium exchanges, thereby decreasing the cost and improving the efficiency of stem cell culture.

Implementation Method 1

It has been reported heretofore that sulfated polysaccharides have an effect of protecting FGF from degradation, denaturation, deactivation and the like

Methodology Applied

Scientific EffectProtective effect of sulfated polysaccharides:

Data Source

PatentUS10689622B2Culture medium for proliferating stem cell, which contains sulfated compound

Publication Date: 2020.06.23 AJINOMOTO CO INC

AI summary

A medium which comprises a fibroblast growth factor (FGF), and a sulfated compound or a pharmaceutically acceptable salt thereof at a concentration which promotes the growth of a stem cell in the presence of FGF, is useful for culturing stem cells.