Very high cell density perfusion of CHO cells anchored in a non-woven matrix-based bioreactor
2015 (English)In: Journal of Biotechnology, ISSN 0168-1656, E-ISSN 1873-4863, Vol. 213, 28-41 p.Article in journal (Refereed) Published
Recombinant Chinese Hamster Ovary (CHO) cells producing IgG monoclonal antibody were cultivated in a novel perfusion culture system CellTank, integrating the bioreactor and the cell retention function. In this system, the cells were harbored in a non-woven polyester matrix perfused by the culture medium and immersed in a reservoir. Although adapted to suspension, the CHO cells stayed entrapped in the matrix. The cell-free medium was efficiently circulated from the reservoir into- and through the matrix by a centrifugal pump placed at the bottom of the bioreactor resulting in highly homogenous concentrations of the nutrients and metabolites in the whole system as confirmed by measurements from different sampling locations. A real-time biomass sensor using the dielectric properties of living cells was used to measure the cell density. The performances of the CellTank were studied in three perfusion runs. A very high cell density measured as 200 pF/cm (where 1 pF/cm is equivalent to 1 x 106 viable cells/mL) was achieved at a perfusion rate of 10 reactor volumes per day (RV/day) in the first run. In the second run, the effect of cell growth arrest by hypothermia at temperatures lowered gradually from 37 C to 29 C was studied during 13 days at cell densities above 100 pF/cm. Finally a production run was performed at high cell densities, where a temperature shift to 31 C was applied at cell density 100 pF/cm during a production period of 14 days in minimized feeding conditions. The IgG concentrations were comparable in the matrix and in the harvest line in all the runs, indicating no retention of the product of interest. The cell specific productivity was comparable or higher than in Erlenmeyer flask batch culture. During the production run, the final harvested IgG production was 35 times higher in the CellTank compared to a repeated batch culture in the same vessel volume during the same time period.
Place, publisher, year, edition, pages
[Zhang, Ye; Chotteau, Veronique] KTH, Royal Inst Technol, Cell Technol Grp CETEG, Sch Biotechnol,Dept Ind Biotechnol Bioproc Design, SE-10691 Stockholm, Sweden. [Stobbe, Per] PerfuseCell, DK-2840 Holte, Denmark. [Silvander, Christian Orrego] Belach Biotekn, SE-14250 Skogas, Sweden., 2015. Vol. 213, 28-41 p.
Disposable bioreactor, On-line biomass sensor, IgG production, Dielectric spectroscopy, Hypothermia
Medical Biotechnology (with a focus on Cell Biology (including Stem Cell Biology), Molecular Biology, Microbiology, Biochemistry or Biopharmacy)
IdentifiersURN: urn:nbn:se:kth:diva-176326DOI: 10.1016/j.jbiotec.2015.07.006ISI: 000362286400005PubMedID: 26211737ScopusID: 2-s2.0-84942837005OAI: oai:DiVA.org:kth-176326DiVA: diva2:871898
QC 201511172015-11-172015-11-032015-11-17Bibliographically approved