Plasma-Treated Microcarriers for Stem Cell Bioreactor Expansion
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Solution Overview
Problem
Current bioreactors face challenges in expanding pluripotent stem cells due to agitation-induced stress and the difficulty in controlling stem cell differentiation, with existing substrates often leading to xeno-contamination and biological variability.
Innovation Solution
Development of polymer-based cell carriers with surface modifications such as gas plasma treatment and biomolecular coatings, featuring structured indentations to enhance cell attachment, proliferation, and controlled differentiation while minimizing shear forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If traditional bioreactor agitation is used to suspend cells and enable mass transfer, then nutrient and oxygen transfer is improved, but stem cells are damaged due to high flow-induced stress
Solution Approach 1:
The patent introduces microcarriers as an intermediary substrate that stem cells attach to, forming cell-carrier aggregates. These aggregates are then suspended in the bioreactor medium, allowing mass transfer to occur at the aggregate level rather than requiring direct cell suspension. This mediator approach protects sensitive stem cells from direct exposure to high shear forces while maintaining effective nutrient and oxygen transfer to the cells through the aggregate structure.
2Productivity
If surface coating with extracellular matrix proteins is used to support stem cell growth, then cell attachment and proliferation are improved, but xeno-contamination risk and biological variability increase
Solution Approach 1:
The patent modifies the surface properties of microcarriers through plasma treatment to create specific surface chemistry and topography that support stem cell attachment and proliferation. This physical and chemical modification approach replaces the need for protein coatings, changing the surface parameters (roughness, charge, hydrophobicity) to achieve cell compatibility without introducing xeno-contamination risks or biological variability associated with animal-derived extracellular matrix proteins.
3Productivity
If larger scale cell expansion is achieved using traditional substrates, then cell yield increases, but control over stem cell differentiation is lost
Solution Approach 1:
The patent creates microcarriers with specific local surface characteristics (plasma-treated zones, controlled porosity, defined topography) that provide localized cues for stem cell behavior. These localized surface properties allow differentiation control to be maintained at the micro-scale even during large-scale expansion, enabling spatially-defined control mechanisms that persist throughout the bioreactor system.
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 modified cell carriers effectively protect stem cells from hydrodynamic stress, maintain pluripotency, and facilitate directed differentiation, achieving high cell yields and purity in bioreactors.
Implementation Method 1
the one or more outer surfaces are modified with gas plasma treatment
Implementation Method 2
the carrier has a length at least about 0.2 mm, a width at least about 0.2 mm, and a height in a range from about 0.05 mm to 1.2 mm and each of the structured indentations has a major axis in a range from about 0.1 mm to 0.5 mm, a minor axis in a range from about 0.1 mm to 0.5 mm and a depth in a range from about 0.025 mm to about 0.5 mm
Data Source
AI summary
A carrier for expansion of pluripotent stem cells is provided, wherein the carrier comprises a substrate comprising one or more outer surfaces, wherein the one or more outer surfaces are modified with gas plasma treatment, and one or more structured indentations on one or more of the outer surfaces. The carrier has a length at least about 0.2 mm, a width at least about 0.2 mm, and a height in a range from about 0.05 mm to 1.2 mm and each of the structured indentations has a major axis in a range from about 0.1 mm to 0.5 mm, a minor axis in a range from about 0.1 mm to 0.5 mm and a depth in a range from about 0.025 mm to about 0.5 mm. A method of making the carrier, and culturing stromal cells using the same carrier are also provided.