Production of .alpha.-abeta

C - Chemistry – Metallurgy – 12 – P

Patent

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C12P 21/08 (2006.01)

Patent

CA 2578137

An improved system for large scale production of anti-amyloid beta antibodies in cell culture, particularly in media characterized by one or more of i) a cumulative amino acid concentration greater than about 70 mM; ii) a molar cumulative glutamine to cumulative asparagine ratio of less than about 2; iii) a molar cumulative glutamine to cumulative total amino acid ratio of less than about 0.2; iv) a molar cumulative inorganic ion to cumulative total amino acid ratio between about 0.4 to 1; or v) a combined cumulative glutamine and cumulative asparagine concentration between about 16 and 36 mM, is provided. The use of such a system allows high levels of protein production and lessens accumulation of certain undesirable factors such as ammonium and/or lactate. Additionally, culture methods including a temperature shift, typically including a decrease in temperature when the culture has reached about 20-80% of its maximal cell density, are provided. Alternatively or additionally, the present invention provides methods such that, after reaching a peak, lactate and/or ammonium levels in the culture decrease over time.

Cette invention concerne un système amélioré de production à grande échelle de protéines et/ou de polypeptides en culture cellulaire, en particulier dans un milieu caractérisé par un ou plusieurs des éléments suivants: i) une concentration d'acides aminés cumulés supérieure à environ 70 mM; ii) un rapport molaire glutamine cumulée/asparagine cumulée inférieur à environ 2; iii) un rapport molaire glutamine cumulée/total d'acides aminés cumulés inférieur à environ 0,2; iv) un rapport molaire ion inorganique cumulé/total d'acides aminés cumulés compris entre environ 0,4 et 1; et v) une concentration combinée de glutamine cumulée et d'asparagine cumulée comprise entre environ 16 et 36 mM. L'utilisation d'un tel système permet de produire des protéines en grandes quantités et de réduire l'accumulation de certains facteurs indésirables tels que l'ammonium et/ou le lactate. Cette invention concerne également des procédés de culture comprenant un écart de température, habituellement une baisse de température lorsque la culture a atteint entre 20 et 80 % de sa densité cellulaire maximale. Dans une variante ou en outre, cette invention concerne des procédés selon lesquels les niveaux de lactate et/ou d'ammonium, après avoir atteint un sommet, diminuent progressivement dans la culture.

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