Cell Sorting Using PEDF to Induce Apoptosis in Undifferentiated Cells
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Solution Overview
Problem
Current methods for sorting differentiated cells from undifferentiated cells are costly and inefficient, posing a significant challenge in regenerative medicine, particularly in ensuring the purity and safety of cells for transplantation by removing residual undifferentiated cells that can lead to tumorigenicity.
Innovation Solution
The use of pigment epithelium-derived factor (PEDF) to inhibit the growth and induce apoptosis of undifferentiated cells, specifically pluripotent stem cells like iPS and ES cells, while sparing differentiated cells, thereby purifying the cell population and reducing tumorigenic risk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional cell sorting methods (such as FACS) are used to separate differentiated cells from undifferentiated cells, then cell purification can be achieved, but the process becomes costly and inefficient
Solution Approach 1:
The invention utilizes the endogenous PEDF protein that is naturally secreted by differentiated cells to perform the sorting function. The differentiated cells themselves provide the sorting mechanism by secreting PEDF that selectively kills undifferentiated cells, eliminating the need for external sorting equipment or reagents.
Solution Approach 2:
PEDF acts as an intermediary substance that mediates the selective elimination of undifferentiated cells. It is secreted by differentiated cells and serves as the active agent that induces apoptosis in undifferentiated cells through specific molecular interactions.
2Reliability
If conventional cell sorting methods are used to remove undifferentiated cells, then tumorigenicity risk can be reduced, but the process becomes complex and expensive
Solution Approach 1:
The differentiated cells autonomously perform the safety function by secreting PEDF that selectively eliminates undifferentiated cells. This self-service mechanism ensures tumorigenicity risk reduction without requiring complex external sorting systems or multiple processing steps.
Solution Approach 2:
The invention extracts and utilizes the naturally occurring PEDF protein from differentiated cells as the active sorting agent. By focusing on this single endogenous factor, the complex sorting process is simplified into a straightforward secretion-based elimination mechanism.
3Manufacturing precision
If PEDF is used to eliminate undifferentiated cells, then cell population purity is improved, but there is a risk of affecting differentiated cell viability
Solution Approach 1:
PEDF exhibits selective toxicity based on cell differentiation state. The same PEDF protein has different effects on different cell types: it induces apoptosis in undifferentiated cells while having no harmful effect on differentiated cells, demonstrating local quality in its biological activity.
Solution Approach 2:
The invention exploits the parameter change in cell differentiation state as the basis for selective elimination. Undifferentiated cells and differentiated cells respond differently to PEDF due to their distinct molecular characteristics, allowing selective killing based on differentiation status.
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 the efficient and cost-effective purification of differentiated cell populations, significantly reducing the risk of tumorigenicity and ensuring a safe source for cell transplantation by eliminating undifferentiated cells, thus enhancing the safety and efficacy of regenerative medicine applications.
Implementation Method 1
PEDF is known to induce apoptosis in cancer cells, vascular endothelial cells and human umbilical vein endothelial cells and, as induction pathways of these apoptosis, FAS/FASL pathway and p38 MAPK pathway can be mentioned
Implementation Method 2
the present inventors have found that p38 MAPK is involved in a part of the pathway of the apoptosis
Implementation Method 3
PEDF is a factor having an angiogenesis suppressive action and a neuroprotection action
Data Source
AI summary
The invention provides a method of removing or reducing undifferentiated cells from a differentiated cell population contaminated or having a risk of contamination with undifferentiated cells by contacting a pigment epithelium-derived factor with the differentiated cell population to induce apoptosis of the undifferentiated cells. The invention also provides an agent for cell transplantation therapy, containing a differentiated cell population substantially free of an undifferentiated cell, which is obtained by the method, as well as an agent for inducing apoptosis of an undifferentiated cell, containing a pigment epithelium-derived factor, and combined use of the aforementioned agent for cell transplantation therapy and the aforementioned agent for inducing apoptosis.