Adult Stem Cell Isolation by Size and Surface Marker Enrichment
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Solution Overview
Problem
Existing methods for isolating and identifying adult stem cells, particularly mesenchymal stem cells, are inefficient due to their low numbers in tissues and require cumbersome ex vivo culture, limiting their availability for tissue repair and regeneration.
Innovation Solution
A method for identifying and isolating a population of progenitor cells by selecting cells with specific size ranges and gene expressions, such as Oct-4, KLF-4, Nanog, Sox-2, Rex-1, GDF-3, or Stella, and detecting surface antigens like CD99, tetraspan, ICAM, and MUC1 isoforms to enrich for pluripotent subpopulations, which can then be differentiated into various tissue lineages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If sustained ex vivo culture is used to generate sufficient cell numbers, then cell quantity increases, but culture time and process complexity increase
Solution Approach 1:
The patent applies preliminary action by using in vivo expansion of stem cells within the host organism before harvest. This allows cells to proliferate to sufficient numbers naturally within the biological system, eliminating the need for lengthy ex vivo culture periods. The cells are prepared in advance through biological processes rather than artificial cultivation.
Solution Approach 2:
The patent replaces the mechanical/ex vivo culture system with a biological/in vivo expansion system. Instead of using tissue culture plastic and ex vivo cultivation methods, the invention utilizes the host's physiological environment to naturally expand cell populations, substituting artificial mechanical culture systems with biological processes.
2Quantity of substance
If conventional isolation methods are used, then all cell types are collected, but stem cell purity decreases due to low stem cell numbers in the sample
Solution Approach 1:
The patent applies local quality by using specific surface marker profiles to identify and isolate particular stem cell subpopulations from heterogeneous tissue samples. Different stem cell types are distinguished by their unique combinations of surface markers (such as CD90+, CD105+, CD73+ for MSCs), allowing selective enrichment of desired cell populations while excluding other cell types.
Solution Approach 2:
The patent uses parameter changes by varying the selection criteria based on surface marker expression patterns. Flow cytometry and magnetic-activated cell sorting (MACS) techniques enable selective isolation by adjusting selection parameters according to the specific marker profile desired, thereby changing the composition of the isolated cell population to enrich for target stem cells.
3Measurement precision
If multiple surface markers are used for identification, then cell specificity increases, but detection complexity increases
Solution Approach 1:
The patent applies universality by using flow cytometry and MACS techniques that can simultaneously detect and sort cells based on multiple surface markers in a single operation. These multi-functional methods enable concurrent analysis of several marker expressions (CD90, CD105, CD73, etc.) without requiring separate assays for each marker, thereby maintaining high specificity while managing detection complexity.
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.