Gravity-Based Stem Cell Subfractionation for Homogeneous Populations
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for isolating multi-lineage stem cells are hindered by heterogeneity, high contamination risk, and high costs, particularly due to reliance on density-gradient centrifugation, antibody selection, and FACS sorting, which are not suitable for clinical applications.
Innovation Solution
A subfractionation cell culture method using natural gravity in non-coated or collagen/polylysine-coated culture dishes to separate adherent bone marrow cells based on density, eliminating the need for centrifugation and enzymatic treatment, resulting in highly homogeneous populations of multi-lineage stem cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If density-gradient centrifugation, antibody selection, or FACS sorting are used to isolate multi-lineage stem cells, then cell isolation can be achieved, but the process becomes complex, costly, and produces heterogeneous cell populations with high contamination risk
Solution Approach 1:
The patent extracts and eliminates the complex steps of density-gradient centrifugation, antibody selection, and FACS sorting from the isolation process. By removing these unnecessary components, the method achieves cell population homogeneity through a simpler gravity-based subfractionation approach, directly resolving the contradiction between manufacturing precision and device complexity
Solution Approach 2:
The patent replaces complex mechanical separation systems (centrifugation devices, FACS sorters, antibody-based separation) with a simple gravity-based subfractionation system using non-coated or collagen/polylysine-coated culture dishes. This substitution dramatically reduces device complexity while maintaining or improving cell population homogeneity
2Manufacturing precision
If density-gradient centrifugation, antibody selection, or FACS sorting are used to isolate multi-lineage stem cells, then cell isolation can be achieved, but the cost increases significantly
Solution Approach 1:
The patent employs simple, inexpensive disposable culture dishes (non-coated or collagen/polylysine-coated) as the isolation system, replacing expensive centrifugation machines, FACS sorters, and antibody reagents. This approach dramatically reduces production cost while achieving comparable or superior cell population homogeneity through gravity-based subfractionation
3Reliability
If conventional isolation methods are used, then stem cells can be isolated, but contamination risk increases due to heterogeneity of cultured cells
Solution Approach 1:
The patent segments the cell population into distinct subfractions based on density using gravity-based subfractionation. By separating cells into different density fractions and selecting appropriate subfractions for culture, the method reduces heterogeneity and contamination risk while maintaining cell population homogeneity, directly addressing the reliability issue
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
This method produces highly homogeneous multi-lineage stem cell populations with reduced contamination potential and cost, capable of differentiating into various lineages such as chondrogenic, osteogenic, adipogenic, neurogenic, and hepatogenic cells, suitable for clinical use.
Implementation Method 1
allowing a sample of cells to settle in a first container without centrifugation, wherein the denser cells settle to the bottom and comparatively less dense cells are present in the supernatant liquid
Implementation Method 2
separate adherent bone marrow cells based on density
Data Source
AI summary
The present application discloses a method of obtaining multi-lineage stem cells or progenitor cells by allowing a sample of cells to settle in a container; transferring supernatant from the container to another container; and eventually isolating a colony from the supernatant after several transfer/settle processes and expanding further, and optionally freezing the cells thus obtained.