Feeder-Free NK Cell Expansion Using B7-H6, 4-1BBL, and ICAM-1 Polypeptides
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Solution Overview
Problem
Current methods for expanding natural killer (NK) cells for clinical applications are limited by the need for feeder cells, which are costly, difficult to scale up, and can contaminate the NK cell population, hindering large-scale feeder-free expansion.
Innovation Solution
The use of specific polypeptides such as B7-H6, 4-1BBL, and ICAM-1, either alone or in combination with IL-21, in a feeder cell-free culture medium to promote NK cell expansion, achieving significant fold expansion over several days.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If feeder cells are used for NK cell expansion, then NK cell proliferation is supported, but the process becomes costly, difficult to scale up, and risks contamination of the NK cell population
Solution Approach 1:
The patent extracts and isolates the essential expansion signals from feeder cells into specific polypeptide components (B7-H6, 4-1BBL, ICAM-1). By taking out only the necessary functional elements and removing the problematic feeder cell system, the invention achieves NK cell expansion without the complexity, contamination risk, and scaling difficulties associated with feeder cells.
Solution Approach 2:
The patent introduces soluble polypeptides (B7-H6, 4-1BBL, ICAM-1) as intermediary molecules that mediate the interaction between NK cells and the culture environment. These polypeptide intermediaries replace the direct cell-to-cell contact provided by feeder cells, transmitting the necessary survival and proliferation signals without requiring living feeder cells.
2Reliability
If feeder cells are used for NK cell expansion, then NK cell survival and proliferation are promoted, but contamination of the NK cell population occurs
Solution Approach 1:
The invention extracts the beneficial survival and proliferation signals from feeder cells into defined polypeptide components while removing the harmful contamination aspect. By isolating the essential functional signals (B7-H6, 4-1BBL, ICAM-1) into soluble forms, the patent maintains NK cell reliability without the risk of feeder cell contamination.
Solution Approach 2:
The patent replaces long-lived feeder cells with soluble polypeptides that can be easily added to and removed from the culture system. These polypeptide factors act as disposable signaling molecules that can be precisely controlled, added in defined amounts, and completely removed if needed, eliminating the persistent contamination risk associated with living feeder cells.
3Quantity of substance
If feeder cells are used for NK cell expansion, then expansion is achieved, but scalability is limited
Solution Approach 1:
The patent replaces the mechanical complexity of maintaining and managing living feeder cell cultures with a simple liquid-phase polypeptide addition system. This substitution eliminates the need for complex feeder cell preparation, irradiation, and maintenance procedures, enabling straightforward scaling from small to large volumes by simply adding more polypeptide-containing medium.
Solution Approach 2:
The invention changes the physical state of the expansion signals from living cellular entities to soluble polypeptides. This parameter change from solid/complex feeder cells to liquid-soluble factors enables easier manipulation, precise dosing, and straightforward scaling of the expansion process, directly improving productivity and scalability.
Data Source
AI summary
Provided herein are methods, compositions, and kits for expanding natural killer cells in the absence of feeder cells.