Muscle Stem Cell Culture Medium Cytokine Supplementation

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Solution Overview

Problem

Current methods for culturing muscle stem cells in vitro are limited by their inability to support long-term expansion and maintain stemness, leading to cell differentiation and loss of proliferative potential, making it difficult to apply genetic corrections for muscle degenerative diseases.

Innovation Solution

A cell culture medium supplemented with cytokines secreted by blood cells, specifically GM-CSF, sICAM-1, IFN gamma, IL-1, IL-4, IL-13, TNF alpha, and IL-2, which promotes the proliferation and maintains the stemness of muscle stem cells, allowing for serial passage and significant amplification.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If current culture protocols (F10 medium with 10 ng/ml FGF) are used, then muscle stem cells can be cultured initially, but they can only divide 3-5 times and then undergo crisis leading to cell death or differentiation

Engineering Contradiction:

Improvecell division capacityVSAvoidstemness maintenance

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent changes the chemical parameters of the culture medium by replacing FGF with a combination of EGF (20-50 ng/ml) and HGF (20-50 ng/ml), and by adding specific supplements including insulin (5-20 μg/ml), transferrin (5-20 μg/ml), and selenium (5-20 ng/ml). These parameter changes enable muscle stem cells to maintain stemness while dividing extensively in vitro without undergoing crisis

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite culture medium system that combines multiple growth factors (EGF, HGF), supplements (insulin, transferrin, selenium), and base medium components. This composite formulation works synergistically to support long-term muscle stem cell proliferation while maintaining their undifferentiated state, overcoming the limitations of single-factor protocols

Inventive Principle:

Principle #40Composite materials

2Quantity of substance

If muscle stem cells are continuously expanded in current protocols, then cell number increases, but most cells die during crisis and survived cells differentiate to progenitor cells losing stemness

Engineering Contradiction:

Improvecell numberVSAvoidcell phenotype stability

Core Design Contradiction:

Quantity of substanceVSStability of the object's composition

Solution Approach 1:

The patent establishes continuous culture conditions that prevent crisis by maintaining optimal growth factor levels (EGF and HGF) and supplement concentrations throughout extended passage periods. This continuous support system allows muscle stem cells to proliferate indefinitely while maintaining stable phenotype and stemness, eliminating the periodic crisis that causes cell death and differentiation in conventional protocols

Inventive Principle:

Principle #20Continuity of useful action

3Loss of time

If muscle stem cells are cultured for 1-3 passages in current system, then cells can be obtained, but all isolated muscle stem cells differentiate to progenitor cells and molecular markers are lost

Engineering Contradiction:

Improveculture durationVSAvoidmarker retention

Core Design Contradiction:

Loss of timeVSManufacturing precision

Solution Approach 1:

The patent implements a feedback mechanism where the culture medium composition is optimized based on the specific needs of muscle stem cells during extended culture. The combination of EGF, HGF, and supplements creates a feedback-friendly environment that continuously signals cells to maintain their stem cell program, preventing differentiation even after many passages. This is evidenced by sustained expression of molecular markers such as Pax7 and Myf5 throughout long-term culture

Inventive Principle:

Principle #23Feedback

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 medium enables muscle stem cells to divide extensively in vitro while maintaining their stemness and differentiation potential, enabling effective repair of muscle injuries and secondary injuries post-transplantation, with the potential for therapeutic applications in muscle degenerative diseases.

Implementation Method 1

The cytokines secreted by blood cells can promote the proliferation of muscle stem cells in vitro and maintain the stemness thereof

Methodology Applied

Scientific EffectCytokine signaling:

Implementation Method 2

The cytokines secreted by blood cells can promote the proliferation of muscle stem cells in vitro and maintain the stemness thereof

Methodology Applied

Scientific EffectStem cell maintenance through cytokine exposure:

Data Source

PatentUS10287549B2Muscle stem cell in vitro culture method and application

Publication Date: 2019.05.14 BEIJING MUSCEL BIOTECHNOLOGY CO LTD

AI summary

Provided is a muscle stem cell in vitro culture method. A muscle stem cell is cultivated in vitro by using a cell culture medium of a cell factor added with a blood cell or a conditioned medium of the blood cell. Also provided is a culture medium used in the muscle stem cell in vitro culture method and an application thereof.