Nerve Fascicle Production via Feeder Cell Cultivation
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Solution Overview
Problem
Current methods for producing nerve fascicles for transplantation, such as injecting neural stem cells, face challenges in efficiently extending and enlarging axons, making it difficult to form fascicles with sufficient length and diameter for effective neural tissue repair, particularly in central nervous system damage like spinal cord injuries.
Innovation Solution
A method involving the cultivation of neural cells in the presence of glial cells and feeder cells like vascular component cells, perivascular cells, and oligodendrocytes to extend and enlarge axons, using a substrate with recesses and channels covered with feeder cells, and incorporating endothelial cells to form a tube along the axons, resulting in a nerve fascicle with a myelin sheath.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If neural stem cells are injected into the affected part, then the method is simple and widely applicable, but the cells tend to move inside the body and are less likely to be engrafted, making it difficult to efficiently repair the damaged site
Solution Approach 1:
The patent applies preliminary action by pre-forming a nerve fascicle structure with aligned neural cells and extended axons before transplantation. The neural cells are cultivated in a controlled environment with feeder layers and growth factors to pre-establish axonal extensions and organizational structure, so that when transplanted, the cells are already positioned and oriented for effective integration at the injury site rather than relying on random migration after injection
2Stability of the object's composition
If neural cells are cultivated to extend axons and form a nerve fascicle, then the structure is more organized, but the axons cannot be efficiently extended and enlarged, making it difficult to produce a nerve fascicle with sufficient length and thickness
Solution Approach 1:
The patent applies parameter changes by systematically optimizing multiple cultivation parameters including: using specific feeder cell layers (astrocytes, Schwann cells), controlling growth factor concentrations (NGF, BDNF, NT-3), adjusting substrate composition (laminin, poly-D-lysine), and managing cell density ratios. These parameter optimizations collectively enhance axonal extension rate and final axon diameter, enabling production of nerve fascicles with sufficient length and thickness for clinical transplantation
3Manufacturing precision
If a nerve fascicle with sufficient length and diameter is produced for transplantation, then effective neural tissue repair is enabled, but it requires a long cultivation period
Solution Approach 1:
The patent applies continuity of useful action by implementing continuous culture conditions with sustained growth factor supply, maintaining optimal humidity and temperature, and using culture media that support prolonged axonal extension. The cultivation system continuously provides nutrients and growth signals without interruption, enabling axons to extend and thicken efficiently over the required period without metabolic stress or growth stagnation
Solution Approach 2:
The patent reduces cultivation time by performing preliminary actions including: pre-coating substrates with adhesion-promoting materials, pre-establishing feeder cell layers before adding neural cells, and pre-optimizing growth factor concentrations. These preliminary preparations create an immediately supportive environment that accelerates axonal extension from the start of cultivation, reducing the overall time needed to achieve target fascicle dimensions
Data Source
AI summary
[Object] Provided is a method of producing a nerve fascicle including efficiently extending axons of neural cells.[Solution] Neural cells are cultivated in the presence of feeder cells including at least one type of cells selected from the group consisting of vascular component cells, perivascular cells, and oligodendrocytes.