Cell Culture Feed Control for Metabolite-Limited Growth
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Solution Overview
Problem
Mammalian cell cultures face growth inhibition due to the accumulation of metabolites such as 3-(4-hydroxyphenyl)lactate, 4-hydroxyphenylpyruvate, phenyllactate, indolelactate, indolecarboxylic acid, homocysteine, 2-hydroxybutyric acid, isovalerate, and formate, which limit cell density and productivity, despite efforts to maintain low lactate and ammonia levels.
Innovation Solution
Maintaining specific metabolites and amino acids at low concentrations in the cell culture medium, below 3 mM and 2 mM respectively, using online and offline measurement methods to control their levels, and adjusting feed media to prevent accumulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional cell culture methods are used, then cells can grow and produce proteins, but metabolites such as lactate and ammonia accumulate to high levels which inhibit cell growth and productivity
Solution Approach 1:
The patent extracts and removes harmful metabolites (lactate, ammonia, and other aromatic metabolites) from the cell culture medium through controlled feeding strategies and metabolic engineering, thereby eliminating their inhibitory effects on cell growth and productivity while maintaining cellular metabolic functions
Solution Approach 2:
The patent changes key metabolic parameters by controlling the concentration of specific amino acids (phenylalanine, tyrosine, tryptophan, methionine, leucine, serine, threonine, and glycine) in the feed medium, thereby altering the metabolic pathway of cells to reduce the accumulation of harmful aromatic metabolites and improve overall productivity
2Productivity
If lactate and ammonia levels are kept low through conventional methods, then some growth inhibition is reduced, but cell growth still slows down limiting maximum cell density and productivity
Solution Approach 1:
The patent converts the harmful accumulation of aromatic metabolites into a beneficial control strategy by identifying specific precursor amino acids and controlling their feed concentrations to prevent the formation of inhibitory metabolites, thereby transforming a metabolic problem into a controllable feeding parameter
Solution Approach 2:
The patent implements feedback control by monitoring cell growth and metabolite levels, and adjusting the feed medium composition accordingly to maintain optimal amino acid concentrations that prevent aromatic metabolite accumulation while supporting continuous cell growth and high productivity
3Quantity of substance
If high cell density is achieved, then productivity increases, but metabolite accumulation becomes more severe causing growth inhibition
Solution Approach 1:
The patent applies preliminary action by pre-formulating feed media with controlled amino acid concentrations that prevent the accumulation of harmful metabolites before they can inhibit cell growth, enabling sustained high cell density culture without the typical metabolite-related growth slowdown
Data Source
AI summary
A method of cell culture comprising providing cells in a cell culture medium to start a cell culture process, and, maintaining at least one metabolite selected from 3-(4-hydroxyphenyl)lactate, 4-hydroxyphenylpyruvate, phenyllactate, indolelactate, indolecarboxylic acid, homocysteine, 2-hydroxybutyric acid, isovalerate and formate below a concentration C1 in the cell culture medium, wherein C1 is 3 mM and/or (ii) maintaining at least one amino acid selected from phenylalanine, tyrosine, tryptophan, methionine, leucine, serine, threonine and glycine below a concentration C2 in the cell culture medium, wherein C2 is 2 mM.