Adult Stem Cell Isolation by Size and Surface Marker Selection
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Solution Overview
Problem
Existing methods for isolating and enriching adult stem cells, particularly mesenchymal stem cells, are inefficient and fail to capture the full potential of these cells due to their low numbers and require cumbersome ex vivo culture, limiting their application in tissue repair and regeneration.
Innovation Solution
A method for identifying and isolating a population of progenitor cells by selecting cells with specific size ranges (4-6 μm) and assaying for expression of stem cell-associated genes (Oct-4, KLF-4, Nanog, Sox-2, Rex-1, GDF-3, Stella) and surface markers (CD99, MUC1, ICAM), enabling the enrichment of pluripotent subpopulations with multilineage potential.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If sustained ex vivo culture on tissue culture plastic is used to generate sufficient cell numbers, then cell quantity increases, but the process becomes time-consuming and complex
Solution Approach 1:
The patent applies preliminary action by identifying and isolating stem cells using specific surface markers (CD73, CD90, CD105) and size characteristics (4-6 μm) before culture expansion. This preliminary identification and enrichment step allows for more efficient subsequent culture, reducing the time required to generate sufficient cell numbers compared to starting from an unenriched population.
Solution Approach 2:
The patent utilizes parameter changes by defining specific physical parameters (cell size of 4-6 μm) and molecular parameters (surface marker expression profiles) to identify and isolate the target cell population. These parameter-based selection criteria enable rapid enrichment of stem cells from heterogeneous populations, significantly reducing the time needed to obtain sufficient numbers for therapy.
2Productivity
If traditional isolation methods are used, then the process is simple, but the efficiency of capturing full stem cell potential is low
Solution Approach 1:
The patent employs parameter changes by establishing specific selection criteria including cell size (4-6 μm) and surface marker expression patterns (CD73+, CD90+, CD105+) to identify and isolate stem cells. These defined parameters enable highly efficient isolation of the target population with multilineage differentiation potential, dramatically improving productivity compared to traditional non-specific methods.
Solution Approach 2:
The patent replaces traditional mechanical or manual isolation methods with marker-based identification and sorting approaches. By using surface marker expression profiles and size characteristics as selection criteria, the method substitutes simple physical separation with a more sophisticated but highly efficient biological identification system, achieving superior isolation efficiency.
3Manufacturing precision
If stem cells are isolated without specific markers, then the method is straightforward, but the purity of the isolated population is low
Solution Approach 1:
The patent achieves high manufacturing precision by defining specific parameter ranges for cell isolation: size of 4-6 μm and surface marker expression patterns (CD73+, CD90+, CD105+). These precise parameter specifications enable highly pure isolation of the target stem cell population, ensuring that the isolated cells possess the desired multilineage differentiation potential.
Solution Approach 2:
The patent applies local quality by identifying specific subpopulations within the heterogeneous cell mixture based on their unique characteristics (size and surface markers). Rather than treating all cells uniformly, the method targets specific local qualities of the target cells, achieving high purity isolation of the stem cell subset with the desired therapeutic potential.
Data Source
AI summary
Methods, compositions and cells are provided that identify and isolate a population of adult non-embryonic progenitor cells having multilineage potential, physical diameters of about 2 μm to about 8 μm in size or about 4 μm to about 6 μm, and expressing at least one of the stem cell associated genes among Oct-4, KLF-4, Nanog, Sox-2, Rex-1, GDF-3 or Stella. Methods are also provided that identify and isolate populations, which are subsets or subpopulations of progenitor adult stem cells within the population of the adult stem cells which is a heterogeneous population, the methods including contacting the adult stem cells with a ligand specific for at least one of: CD99, tetraspan, ICAM4, full-length MUC1, and truncated MUC1 receptor, in which a presence of a surface protein on the cells that bind to the ligand identifies the population which is the subset of the differentiated progenitor adult stem cells.