SUSD2 Protein Marker for Pancreatic Endocrine Cell Isolation
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Solution Overview
Problem
Current methods for differentiating human pluripotent stem cells into functional mature pancreatic beta-cells in vitro are inefficient, and there is a lack of effective molecular markers for isolating pancreatic endocrine progenitor and nascent endocrine cells, limiting the development of cell replacement therapies for diabetes.
Innovation Solution
The use of the SUSD2 protein as a marker for identifying and sorting pancreatic endocrine progenitor and nascent endocrine cells through immunofluorescence, flow cytometry, and magnetic bead cell sorting, leveraging its enriched expression in these cell types to facilitate their isolation and purification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If pancreatic progenitor cells are used for cell replacement therapy, then sufficient donor islet cells can be obtained, but their tumorigenicity limits clinical application
Solution Approach 1:
The patent applies preliminary action by using SUSD2 as a marker to identify and isolate pancreatic endocrine progenitor cells at a specific developmental stage before they acquire full functional capacity. This allows selection of cells that have passed certain developmental checkpoints, potentially reducing tumorigenicity while maintaining differentiation potential for future cell replacement therapy
2Productivity
If pancreatic progenitor cells are differentiated into functional mature beta-cells in vitro, then efficient cell replacement therapy can be achieved, but the differentiation efficiency is currently low
Solution Approach 1:
The patent employs feedback by using SUSD2 expression as a measurable indicator to monitor and control the differentiation process. By detecting SUSD2 expression levels, researchers can assess the presence of pancreatic endocrine progenitor cells and adjust differentiation conditions accordingly, creating a feedback loop that improves both efficiency and reliability of generating functional beta-cells
3Loss of information
If transcription factors like NGN3 are used as markers, then pancreatic endocrine progenitor cell fate can be indicated, but these proteins cannot be used to isolate and purify specific cell populations
Solution Approach 1:
The patent introduces SUSD2 as an intermediary marker that bridges the gap between transcription factors and isolatable surface proteins. SUSD2 expression correlates with pancreatic endocrine progenitor cell fate like NGN3, but unlike NGN3, SUSD2 can be targeted by antibodies for flow cytometry-based isolation, thus serving as a functional intermediary that enables both identification and purification
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
The SUSD2 protein effectively identifies and isolates pancreatic endocrine progenitor and nascent endocrine cells, enhancing the efficiency of differentiating these cells in vitro and promoting the development of cell replacement therapies for diabetes.
Implementation Method 1
anti-SUSD2 monoclonal antibody
Implementation Method 2
immunofluorescence antibody assay
Implementation Method 3
flow cytometry
Implementation Method 4
magnetic beads cell sorting
Data Source
Figure 1(a)~1(b)D
Figure 2(a)~2(b)
Figure 3~4
AI summary
Disclosed is a use of a SUSD2 protein as a marker, in particular a use of the SUSD2 protein as the marker in identification, selection or separation of pancreatic internal secretion precursor cells and/or newborn pancreatic internal secretion cells; and a use of an mRNA, for encoding the SUSD2 protein, of a precursor protein as the marker in identification of the pancreatic internal secretion precursor cells and/or the newborn pancreatic internal secretion cells. Through analysis of gene expression of pancreatic endoderm cells sourced by induced directional differentiation of human pluripotent stem cells, the enrichment expression of a SUSD2 gene in the pancreatic internal secretion precursor cells and the newborn pancreatic internal secretion cells is found. In addition, a protein encoded by the SUSD2 gene is a receptor protein on cell membranes. Using the protein as the marker, the identification, the selection or the separation of the pancreatic internal secretion precursor cells and the newborn pancreatic internal secretion cells can be carried out, which has an important significance on research about pancreas related cells in each development stage.