Method for large-scale production of polypeptide in eukaryote cells and a culture vessel suitable therefor
The invention provides a method for large-scale production of a polypeptide, such as a Factor VII or Factor VIIa polypeptide, in eukaryote cells, such as mammalian cells, contained in a culture liquid, said method comprising: monitoring the concentration of dissolved CO 2 in the culture liquid, and constantly or intermittently sparging atmospheric air through the culture liquid, wherein the sparging rate of the air is controlled in relation to the monitored concentration of dissolved CO 2 in the culture liquid. The method reduces or eliminates the use of bases while providing an excellent pH control. The invention also provides a culture vessel suitable for the methods.
1. A method for large-scale production of a polypeptide in eukaryote cells contained in a culture liquid, said method comprising: monitoring the concentration of dissolved CO 2 in the culture liquid, and constantly or intermittently sparging air through the culture liquid, wherein the sparging rate of the air is controlled in relation to the monitored concentration of dissolved CO 2 in the culture liquid.
2. The method according to claim 1 , wherein the air is sparged at a rate sufficient for maintaining the concentration of dissolved CO 2 in the culture liquid within a predetermined range comprising a set-point for said concentration.
3. The method according to claim 2 , wherein the predetermined range for the concentration of dissolved CO 2 is 80-200 mmHg.
4. The method according to claim 3 , wherein the set-point concentration of dissolved CO 2 in the culture liquid is a value in the range of 100-180 mmHg.
5. The method according to claim 4 , wherein the sparging rate of air is in the range of 0.000-0.100 L/min per L of culture liquid.
6. The method according to claim 5 , wherein the sparging rate of air is in the range of 0.005-0.020 L/min per L of culture liquid when the monitored concentration of dissolved CO 2 is equal to the set-point concentration.
7. The method according to claim 6 , wherein the sparging rate of air is:
in the range of 0.000-0.005 L/min per L of culture liquid when the monitored concentration of dissolved CO 2 is equal to the set-point concentration−5 mmHg; and
in the range of 0.010-0.100 L/min per L of culture liquid when the monitored concentration of dissolved CO 2 is equal to the set-point concentration+5 mmHg.
8. The method according to claim 1 , wherein any solid or liquid substances added to the culture liquid do not give rise to a localized pH value of above 7.5 in said culture liquid.
9. The method according to claim 1 , wherein the polypeptide is a Factor VII polypeptide.
10. A method for large-scale production of a polypeptide in eukaryote cells contained in a culture liquid, said method comprising constantly or intermittently sparging air through the culture liquid at a rate sufficient for maintaining the concentration of dissolved CO 2 in the culture liquid within a predetermined range comprising a set-point for said concentration, wherein any solid or liquid substances added to the culture liquid does not give rise to a localized pH value of above 7.5 in said culture liquid.
11. The method according to claim 10 , wherein the sparging rate of air is in the range of 0.000-0.070 L/min per L of culture liquid L/min per L of culture liquid.
12. The method according to claim 10 , wherein the concentration of dissolved CO 2 in the culture liquid is monitored.
13. The method according to claim 12 , wherein the sparging rate of air is in the range of 0.005-0.020 L/min per L of culture liquid when the monitored concentration of dissolved CO 2 is equal to the set-point concentration.
14. The method according to claim 13 , wherein the sparging rate of air is: in the range of 0.000-0.005 L/min per L of culture liquid when the monitored concentration of dissolved CO 2 is equal to the set-point concentration−5 mmHg; and in the range of 0.010-0.100 L/min per L of culture liquid when the monitored concentration of dissolved CO 2 is equal to the set-point concentration+5 mmHg.
15. The method according to claim 10 , wherein the polypeptide is a Factor VII polypeptide.