Automated Bioreactor for NK Cell Expansion
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Solution Overview
Problem
Conventional flask-based methods for expanding NK cells and NK-like T cells are labor-intensive, limited in scale, prone to contamination, and unsuitable for large clinical studies due to the use of cGMP-incompatible components and high shear processes, which hinder the efficient production of cells for immunotherapy.
Innovation Solution
A closed automated system, such as a bioreactor, is used for large-scale expansion and simultaneous activation of NK cells and NK-like T cells, employing a growth medium with IL-2 and anti-CD3 antibodies, with controlled agitation and heating to achieve a 10-fold expansion and increased cytotoxicity, while minimizing contamination risks and using GMP-compatible components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional flask-based culture methods are used for NK cell expansion, then cell production can be achieved, but the process becomes labor-intensive and limited in scale
Solution Approach 1:
The patent replaces manual flask-based mechanical handling with an automated bioreactor system that uses controlled agitation and gas sparging to cultivate NK cells. This substitution eliminates labor-intensive manual operations while enabling large-scale production through automated control of culture parameters.
Solution Approach 2:
The invention changes the physical parameters of the culture system by transitioning from static flask environments to dynamic bioreactor conditions with controlled agitation speeds, dissolved oxygen levels, and pH regulation. These parameter changes enable scalable production while maintaining cell viability and function.
2Reliability
If conventional flask-based culture is used, then NK cell expansion is possible, but contamination risk increases due to repeated exposure to external agents
Solution Approach 1:
The patent implements a closed bioreactor system that maintains an inert, controlled environment for NK cell culture. This closed system prevents contamination by eliminating repeated openings to the external environment, while still allowing efficient cell expansion through controlled nutrient supply and waste removal.
3Productivity
If stirred-tank bioreactors with high shear processes are used for cell expansion, then large scale production is enabled, but cell damage occurs due to shear sensitivity of hematopoietic cells
Solution Approach 1:
The patent applies local quality control by using gentle gas sparging at specific locations within the bioreactor rather than high-shear stirring throughout. This creates localized mass transfer zones that provide adequate oxygenation and nutrient distribution while maintaining low shear conditions throughout the bulk culture volume, protecting shear-sensitive hematopoietic cells.
4Reliability
If NK precursor separation or feeder cells are used in expansion protocols, then cell activation can be achieved, but the process becomes incompatible with cGMP requirements
Solution Approach 1:
The patent extracts and eliminates problematic components from traditional NK cell expansion protocols, specifically removing the need for NK precursor separation steps and feeder cells. This extraction simplifies the process to meet cGMP requirements while maintaining effective cell activation through alternative mechanisms using defined culture conditions.
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 method achieves a higher purity and cytotoxicity of NK cells compared to conventional flask methods, facilitating clinical applications by providing a cost-effective, scalable, and contamination-free process for producing NK cells for immunotherapy.
Implementation Method 1
expanding said cells within said system with agitation and heating
Data Source
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AI summary
A method of large scale expansion and simultaneous activation of NK cells and NK- like T cells in a closed cell culture system is presented, wherein the expanded cells exhibit increased cytotoxicity.