uPAR+/Nestin+ Stem Cell Isolation via Hydrogel-Guided Self-Dissociation
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Solution Overview
Problem
Conventional methods for isolating and culturing tissue-resident stem cells in solid tissues suffer from variability in cell yield and damage due to protease treatment, and the use of markers like c-Kit and Sca-1 leads to impurities, making standardization difficult and effective isolation challenging.
Innovation Solution
A method involving the preparation of a provisional matrix-mimicking hydrogel, encapsulating tissue fragments, and 3D culturing with plasminogen activator inhibitor (PAI) to induce uPAR+ and nestin+ stem cells to enter the cell cycle, followed by PAI removal and re-culturing to isolate these cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If tissue dissociation is performed using protease treatment to isolate stem cells, then stem cells can be separated from solid tissues, but cell damage occurs and cell yield varies significantly
Solution Approach 1:
The patent extracts and utilizes the endogenous uPAR-plasmin system naturally present in stem cells to achieve tissue dissociation. By adding plasminogen and activator, the method activates the cells' own proteolytic machinery to degrade the extracellular matrix and release stem cells, eliminating the need for exogenous proteases that cause cell damage.
Solution Approach 2:
The method enables stem cells to perform self-dissociation by activating their intrinsic uPAR-plasmin pathway. The stem cells themselves produce the enzymes needed to break down surrounding tissue and free themselves, making the dissociation process self-directed and avoiding exposure to harsh external proteases.
2Manufacturing precision
If conventional markers like c-Kit and Sca-1 are used to isolate stem cells, then purification can be achieved, but hematopoietic cells are also isolated causing impurities
Solution Approach 1:
The patent exploits the localized and differential expression of uPAR and plasminogen among cell types. Stem cells in solid tissues exhibit high expression of these components, while hematopoietic cells do not, allowing selective isolation based on this local molecular signature rather than using markers that are broadly expressed across multiple cell lineages.
3Ease of operation
If tissue dissociation is performed to obtain single cell suspension, then stem cells can be isolated, but the process cannot be standardized due to tissue type variations
Solution Approach 1:
The uPAR-plasmin pathway is a universal mechanism expressed across multiple tissue types including adipose, bone marrow, myocardial, peripheral nerve, skeletal muscle, and synovial tissues. This conserved biological pathway enables a single standardized protocol to effectively isolate stem cells from diverse tissue sources without requiring tissue-specific optimization.
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 allows for high-yield isolation of functional uPAR+ and nestin+ stem cells with minimal damage, suitable for therapeutic applications and research, while maintaining tissue structure and function.
Implementation Method 1
preparing a provisional matrix-mimicking hydrogel; encapsulating isolated tissue fragments into the provisional matrix-mimicking hydrogel; 3D culturing the provisional matrix-mimicking hydrogel into which the tissue fragments are encapsulated
Implementation Method 2
re-culturing the PAI-removed culture with a PAI-free culture medium to degrade the provisional matrix-mimicking hydrogel; isolating stem cells released in the re-culture medium
Data Source
AI summary
The present invention relates to a method for isolating and culturing tissue-resident uPAR+/Nestin+ stem cells, and a use thereof, and provides a method for isolating, on the basis of uPAR-plasmin activity, tissue-resident stem cells present in solid tissues, wherein the uPAR-plasmin activity of stem cells has been suggested to have a close relationship with stem cell growth, migration ability, physiological activity and differentiation ability, and thus can be used in a method for isolating high-potency stem cells, the uPAR+ stem cells isolated from solid tissues are applicable to the production of cell therapeutic agents, tissue engineering therapeutic agents, and novel biopharmaceuticals using secretions including exosomes, and thus have high industrial applicability, and the present invention is applicable to fundamental cell biology and molecular biology research and novel drug development research that relate to the cell division, migration, growth, and differentiation of tissue-resident stem cells.