Primate Embryonic Stem Cell Differentiation into Vascular Cells
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Solution Overview
Problem
Current vascular regenerative therapies using angiogenesis factors have limitations in safety and long-term efficacy, particularly in generating a correct vascular structure composed of endothelial cell tubes and mural cells, which is crucial for effective vascular regeneration.
Innovation Solution
A method for differentiating primate embryonic stem cells into vascular cells, specifically vascular endothelial growth factor receptor (VEGFR-2)-positive and undifferentiated primate embryonic stem cell marker-negative cells, using co-culture with feeder cells, followed by separation and further differentiation in the presence of serum or PDGF-BB, VEGF, and phorbol 12-myristate 13-acetate, to obtain vascular progenitor, endothelial, and mural cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If vascular regenerative therapy uses angiogenesis factors (such as bFGF), then short-term symptom improvement is achieved, but long-term efficacy is insufficient and safety issues arise
Solution Approach 1:
The patent applies preliminary action by pre-differentiating primate embryonic stem cells into vascular cells (endothelial cells and smooth muscle cells) in vitro before transplantation. This preliminary differentiation ensures that the transplanted cells are already committed to vascular lineages, providing long-term efficacy without the safety and efficacy problems of long-term angiogenesis factor administration.
Solution Approach 2:
The patent uses feeder cells as intermediaries to facilitate the differentiation of primate embryonic stem cells into vascular cells. The feeder cells provide necessary growth factors and signals through cell-cell contact and secreted factors, enabling controlled differentiation without direct use of angiogenesis factors in the final therapeutic application.
2Manufacturing precision
If primate embryonic stem cells are differentiated into vascular cells, then a correct vascular structure (endothelial cell tubes with mural cells) is generated, but the differentiation process complexity increases
Solution Approach 1:
The patent segments the vascular differentiation process into distinct stages: first differentiating into endothelial cells, then into smooth muscle cells, and finally forming organized vascular structures with endothelial cell tubes surrounded by mural cells. This segmentation allows precise control at each stage while achieving the complex final vascular structure.
Solution Approach 2:
The patent employs parameter changes by adjusting culture conditions, growth factor concentrations, and cell density at different differentiation stages. These parameter modifications guide the stem cells through sequential differentiation events, achieving precise vascular structure formation without overly complex procedural steps.
3Productivity
If vascular cells are obtained through conventional methods, then cell supply is limited, but achieving long-term culture and in vitro proliferation becomes difficult
Solution Approach 1:
The patent applies self-service by establishing culture conditions that enable vascular cells to self-renew and proliferate in vitro without requiring continuous intervention or re-differentiation from stem cells. The differentiated vascular cells maintain their phenotype and can be expanded indefinitely under optimized culture conditions, providing both large quantities and long-term availability.
Data Source
AI summary
To provide a technique of the differentiation from a primate embryonic stem cell into a vascular cell, and techniques using the same. A method for differentiating a primate embryonic stem cell into a vascular cell, comprising differentiating a primate embryonic stem cell into a VEGFR-2-positive and undifferentiated primate embryonic stem cell marker-negative cell, and if need, further differentiating the resulting cell, a method of the differentiation into a vascular cell, and a vascular cell obtained by the method.