Cell Culture Metabolic Shift for Low-Lactate Protein Production
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Solution Overview
Problem
Existing cell culture methods face challenges in managing lactate accumulation, which limits productivity and viability in bioreactor cultures, particularly in mammalian cell cultures producing proteins and polypeptides, due to lactate production exceeding 30-50 mM, leading to osmotic stress and reduced cell growth.
Innovation Solution
A method is introduced to detect a metabolic shift to lactate consumption by monitoring lactate levels, pH changes, or base addition cessation in a first cell culture, followed by transferring cells to a second culture where lactate consumption occurs, optimizing conditions for enhanced productivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If cells are cultured in batch mode to produce proteins, then protein production can be achieved, but lactate accumulates to 30-50 mM which limits productivity and cell viability
Solution Approach 1:
The patent changes the metabolic parameters of the cell culture by transitioning from batch to fed-batch mode and adjusting glucose feeding rates. This parameter change enables cells to consume lactate instead of producing it, reducing lactate accumulation from 30-50 mM to below 10 mM while maintaining high protein production titers
Solution Approach 2:
The patent implements continuous glucose feeding during the production phase to maintain cells in exponential growth and lactate consumption mode. This continuous action prevents lactate accumulation and extends the productive phase, allowing protein production to continue at high rates without the usual lactate inhibition limits
2Reliability
If base is added to neutralize lactic acid, then pH is maintained, but osmolality increases which restricts cell viability and productivity
Solution Approach 1:
Instead of adding base to neutralize harmful lactic acid, the patent converts the harmful lactate into a beneficial carbon source by inducing lactate consumption metabolism. Cells consume lactate through metabolic pathways, converting it into energy and carbon for protein synthesis, thereby eliminating the need for base addition and reducing osmolality while maintaining pH control
Solution Approach 2:
The cells perform self-regulation by switching to lactate consumption metabolism, which naturally buffers the acidification effect of lactate production. This self-service mechanism eliminates the need for external base addition, reducing osmolality and improving cell viability while maintaining pH stability
3Productivity
If cells are grown to high density in fed-batch culture, then productivity increases, but lactate accumulation still limits maximum achievable productivity
Solution Approach 1:
The patent performs preliminary glucose feeding during the exponential growth phase to establish lactate consumption metabolism before the production phase begins. This preliminary action programs the cells to consume lactate during high-density culture, preventing accumulation even at cell densities exceeding 10^7 cells/mL and enabling sustained high productivity
Data Source
Figure 1A~1C
Figure 2A~2C
AI summary
An improved method for large scale production of proteins and/or polypeptides in cell culture is provided. In accordance with the present invention, the method provides for culturing cells that have metabolically shifted. The use of such a method or system allows high levels of protein or polypeptide production and reduces accumulation of unwanted metabolic waste such as lactate. Proteins and polypeptides expressed in accordance with the present invention may be advantageously used in the preparation of pharmaceutical, immunogenic, or other commercial biologic compositions, such as antibodies.