Influence of aeration-homogenization system in stirred tank bioreactors, dissolved oxygen concentration and pH control mode on BHK-21 cell growth and metabolism

Author(s):Show less -

Fernandez Nunez, Eutimio Gustavo ^[1] ; Leme, Jaci ^[2] ; Parizotto, Leticia de Almeida ^[1] ; Chagas, Wagner Antonio ^[2] ; de Rezende, Alexandre Goncalves ^[3] ; Vale da Costa, Bruno Labate ^[1] ; Ventini Monteiro, Daniela Cristina ^[3] ; Lopes Boldorini, Vera Lucia ^[3] ; Calil Jorge, Soraia Attie ^[3] ; Astray, Renato Mancini ^[3] ; Pereira, Carlos Augusto ^{[3, 1]} ; Caricati, Celso Pereira ^[2] ; Tonso, Aldo ^[1]

Affiliation

^[1] Univ Sao Paulo, Lab Celulas Anim, Dept Engn Quim, Escola Politecn, BR-05508900 Sao Paulo - Brazil

^[2] Inst Butantan, Lab Especial Pesquisa & Desenvolvimento Imunol Ve, BR-05503900 Sao Paulo - Brazil

^[3] Inst Butantan, Lab Imunol Viral, BR-05503900 Sao Paulo - Brazil

• Document type: Journal article
• Source: Cytotechnology; v. 66, n. 4, p. 605-617, AUG 2014.
• Web of Science Citations: 4

Abstract

This work focused on determining the effect of dissolved oxygen concentration (DO) on growth and metabolism of BHK-21 cell line (host cell for recombinant proteins manufacturing and viral vaccines) cultured in two stirred tank bioreactors with different aeration-homogenization systems, as well as pH control mode. BHK-21 cell line adapted to single-cell suspension was cultured in Celligen without aeration cage (rotating gas-sparger) and Bioflo 110, at 10, 30 and 50 % air saturation (impeller for gas dispersion from sparger-ring). The pH was controlled at 7.2 as far as it was possible with gas mixtures. In other runs, at 30 and 50 % (DO) in Bioflo 110, the cells grew at pH controlled with CO2 and NaHCO3 solution. Glucose, lactate, glutamine, and ammonium were quantified by enzymatic methods. Cell concentration, size and specific oxygen consumption were also determined. When NaHCO3 solution was not used, the optimal DOs were 10 and 50 % air saturation for Celligen and Bioflo 110, respectively. In this condition maximum cell concentrations were higher than 4 x 10(6) cell/mL. An increase in maximum cell concentration of 36 % was observed in batch carried out at 30 % air saturation in a classical stirred tank bioreactor (Bioflo 110) with base solution addition. The optimal parameters defined in this work allow for bioprocess developing of viral vaccines, transient protein expression and viral vector for gene therapy based on BHK-21 cell line in two stirred tank bioreactors with different agitation-aeration systems. (AU)