Hematopoietic Stem Cell Enrichment via PTPσ Selective Extraction
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Solution Overview
Problem
Current methods for enriching hematopoietic stem cells (HSCs) are inadequate in selectively removing PTPσ+ cells, which impede the effective repopulating capacity and homing ability of HSCs, particularly in bone marrow and cord blood samples.
Innovation Solution
A method involving the sorting of HSCs based on PTPσ expression using antibodies labeled with fluorophores or magnetic particles, followed by enrichment of PTPσ- cells, and the use of inhibitors such as shRNA to modulate the PTPσ pathway, enhancing the population of CD34+, CD38-, CD45RA-, CD90+, lin-, Rho lo-, and CD33- cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If current enrichment methods are used to isolate HSCs, then the general HSC population is obtained, but PTPσ+ cells that impede repopulating capacity and homing ability are not selectively removed
Solution Approach 1:
The patent applies the extraction principle by specifically removing PTPσ+ cells from the HSC population through flow cytometry sorting. This selective extraction of harmful subpopulations (PTPσ+ cells with poor repopulating capacity) from the total HSC pool enhances the overall quality and therapeutic efficacy of the enriched HSC product without compromising the isolation process itself.
Solution Approach 2:
The patent utilizes color changes (fluorescence) to differentiate and separate HSC subpopulations based on PTPσ expression levels. By labeling PTPσ surface proteins with fluorescently conjugated antibodies and using flow cytometry to detect these fluorescent signals, the method enables precise identification and sorting of PTPσ+ versus PTPσ- cells, thereby achieving selective enrichment of high-quality HSCs.
2Stability of the object's composition
If PTPσ+ cells are not removed, then the HSC sample maintains its original composition, but the homing ability and engraftment efficiency are reduced
Solution Approach 1:
The patent converts the harmful presence of PTPσ+ cells (which have poor engraftment efficiency) into a beneficial sorting marker. By using the PTPσ surface protein expression as a distinguishable feature, the methodology transforms what was previously a problematic heterogeneity in the HSC sample into a useful basis for quality control and enrichment of high-performance HSCs with superior engraftment capabilities.
3Manufacturing precision
If flow cytometry sorting based on PTPσ expression is performed, then PTPσ- cells with high repopulating capacity are enriched, but additional processing steps are required
Solution Approach 1:
The patent achieves multi-functionality by using a single flow cytometry sorting step that simultaneously accomplishes multiple objectives: it identifies HSCs based on PTPσ surface expression, differentiates between high and low quality subpopulations, and physically separates enriched HSCs from depleted fractions all in one integrated process. This universal approach replaces what would otherwise require multiple separate isolation and selection steps.
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 approach significantly increases the repopulating capacity and engraftment of HSCs by selectively removing PTPσ+ cells and promoting hematopoietic reconstitution, particularly in subjects undergoing myelosuppressive therapy or hematopoietic reconstitution.
Implementation Method 1
sorting of HSCs based on PTPσ expression using antibodies labeled with fluorophores or magnetic particles
Implementation Method 2
sorting of HSCs based on PTPσ expression using antibodies labeled with fluorophores or magnetic particles
Data Source
Figure 1A~1E
Figure 2A~2G
Figure 3A~3D
AI summary
In some aspects, the invention relates to populations of hematopoietic cells that are enriched in ΡΤΡσ cells and methods of use thereof.