Suspension Seed Train Expansion for Adherent Cell Scale-Up
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Solution Overview
Problem
Conventional seed train processes for adherent mammalian cells are prone to contamination and operator error, and suspension-adapted cell lines require time and alter the cell transcriptome, making them unsuitable for large-scale, high-yield production of viral vectors.
Innovation Solution
A method involving culturing adherent cells in a series of media with varying serum concentrations, transitioning from adherent to suspension conditions, and inoculating a bioreactor with a medium promoting adherence, without altering the cell line genetically.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional seed train processes are used with adherent cells, then cell production can be achieved, but the process is vulnerable to contamination and operator error
Solution Approach 1:
The patent changes the culture condition parameter from adherent to suspension, eliminating the need for manual manipulation and contamination-prone dissociation protocols while maintaining cell production capability
Solution Approach 2:
The suspension-adapted cell lines perform self-dissociation and self-culture in suspension medium without requiring manual intervention, reducing operator error and contamination risk
2Productivity
If suspension-adapted cell lines are developed, then scale-up production is enabled, but the process is time consuming and alters cell transcriptome
Solution Approach 1:
The patent performs preliminary suspension adaptation in a controlled manner with optimized serum concentration gradients, reducing the time required for full suspension adaptation while preserving transcriptome integrity
Solution Approach 2:
The patent optimizes the serum concentration parameter during the transition phase, using graded reductions to accelerate adaptation while minimizing transcriptome alterations
3Quantity of substance
If conventional adherent seed train processes are used, then cell culture can be maintained, but high cell numbers necessary for desirable product yield cannot be achieved
Solution Approach 1:
The patent changes the culture mode parameter from adherent to suspension, enabling high cell density cultivation and scalable production while simplifying the overall process structure
Solution Approach 2:
The suspension culture system serves multiple functions including high-density cell cultivation, automated processing, and simplified scale-up, replacing multiple specialized adherent culture steps
Data Source
AI summary
The disclosure is directed to a method for seed train expansion of adherent cells comprising culturing cells with a serum-supplemented growth medium in a N-2 vessel; removing the cells from the serum-supplemented medium; inoculating the cells from step into a serum-free growth medium in a N-1 vessel; culturing the cells in the N-1 vessel under suspension conditions; and inoculating a growth medium in a bioreactor with the suspension-cultured cells. In some aspects, the adherent cells are not suspension-adapted. In some aspects, the adherent cells are suspension-adapted. In some aspects, the adherent cells produced by the seed train expansion method are used to produce viral vectors. In some aspects, the viral vectors are AAV vectors.