Divalent Metal Salts Reduce Lactate in Cell Culture
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Solution Overview
Problem
High lactate accumulation in cell cultures leads to acidification and toxicity, limiting cell growth and antibody production, as existing methods like low glucose feeding and metabolic engineering have limitations in effectively reducing lactate levels.
Innovation Solution
Adding divalent transitional metal salts, such as copper and zinc sulphates, to the cell culture medium to reduce lactate accumulation, thereby improving metabolic efficiency and maintaining pH.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If low glucose feeding is used to reduce lactate accumulation, then lactate levels decrease, but cell growth and antibody production are limited
Solution Approach 1:
The patent changes the chemical composition parameters of the cell culture medium by adding divalent transitional metal salts (Cu2+, Zn2+, Mn2+, Co2+, Ni2+, Fe2+) at specific concentrations (0.1-10 µM). This parameter change modifies cellular metabolic pathways to improve glucose oxidation efficiency, allowing cells to maintain high glucose consumption rates while reducing lactate accumulation, thus resolving the contradiction between reducing harmful lactate and maintaining high antibody production.
2Object-generated harmful factors
If metabolic engineering is used to reduce lactate accumulation, then lactate levels decrease, but process complexity increases
Solution Approach 1:
The patent introduces divalent transitional metal salts as intermediary substances that mediate between glucose metabolism and lactate production. These metal salts act as catalysts or co-factors in cellular enzymatic reactions, improving the efficiency of the TCA cycle and pyruvate oxidation without requiring genetic modification of the cells. This approach reduces lactate accumulation through a simpler chemical addition rather than complex metabolic engineering, thus resolving the contradiction between reducing lactate and maintaining process simplicity.
3Productivity
If high cell density is maintained to increase productivity, then antibody production increases, but lactate accumulation increases
Solution Approach 1:
The patent establishes a feedback mechanism where divalent transitional metal salts continuously improve glucose oxidation efficiency throughout the cell culture process. The metal salts enhance the activity of key enzymes in the TCA cycle and pyruvate dehydrogenase complex, ensuring that as cell density increases and glucose consumption rises, the cells' ability to oxidize glucose completely is simultaneously enhanced. This feedback-like effect allows high cell density cultures to maintain low lactate levels by improving the metabolic efficiency at each stage of the culture process.
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 addition of divalent transitional metal salts significantly reduces lactate accumulation by 5-40%, enhancing cell culture performance and antibody production by maintaining pH and improving glucose oxidation.
Implementation Method 1
The addition of divalent transitional metal salts (Copper, Zinc) and their effect on lactate accumulation... divalent transitional metallic salt is having metal selected from a group comprising copper and zinc... improves the overall metabolic efficiency of cells making most of the glucose getting completely oxidized
Implementation Method 2
These Zinc and Copper metal ions are required for the activity of the enzymes involved in Glycolysis & TCA pathway and therefore, the addition of these ions improves the overall metabolic efficiency of cells
Data Source
AI summary
The present disclosure relates to methods of decreasing lactate production in cell culture using divalent transitional metallic salts. The present disclosure also relates to a method of producing polypeptide by adding divalent transitional metallic salt to the cell culture medium for reducing lactate accumulation followed by fermenting and recovering the polypeptide.