Impact of added amino acids on CHO cell productivity during the fed batch bioprocessHorvat, Jernej (Avtor) Narat, Mojca (Mentor) Spadiut, Oliver (Komentor) Amino acidslactateCHO cellfeed developmentmonoclonal antibody productionOver the past 30 years, Chinese hamster ovary (CHO) cells have become a major tool for recombinant protein production, mainly for monoclonal antibodies (mAb) and other biologics. These drugs are widely used to treat cancer, autoimmune disorders and many other diseases, which were considered as untreatable just a few years ago. CHO cells are mammalian cells, which synthesize recombinant products in a form that is suitable for clinical trials and therapies. Nowadays most bioprocesses are fed-batch processes where chemically defined solutions are used to supplement substrates. Such solutions consist of glucose, amino acids, microelements, etc. Despite the addition of the aforementioned solutions during bioprocessing, some of the amino acids are still depleted. In preliminary processes we observed the depletion of asparagine, aspartate, histidine, tryptophan, phenylalanine, glutamate, serine, threonine, glycine, cysteine and lysine. With the adaptation of an already existing feed and the usage of newly developed feeds we were able to increase cell viability and mAb production. These observations showed the importance of understanding the metabolism of CHO cells and the availability of amino acids in the cell culture.[J. Horvat]20212021-02-18 11:09:51Doktorsko delo/naloga124789sl