title: Continuous production of monoclonal antibody in a packed-bed bioreactor.
abstract: In the present study the growth and MAb (monoclonal antibody) production of a mouse x mouse hybridoma cell producing anti-digoxin MAb was evaluated. The hybridoma cells entrapped within the support matrix Fibra-Cel were cultured in batch and continuous mode following special protocols. Cell-culture studies were performed in a 1-litre spinner basket containing 3 g.litre-1 support matrix. Batch culture was operated with the cell density of 42x10(6) cells. During the 7 days of culture, the medium was sampled daily in order to assess glucose and MAb concentrations and the lactate dehydrogenase released into the culture medium. After a culture period of 72 h, the cell density and MAb concentration were found to be 10.4x10(7) cells/3 g of NWPF (non-woven polyester fibre) discs and 250 microg/ml respectively. This yield gradually decreased to 0.55x10(6) cells/3 g of packaging material and 60 microg/ml respectively at the end of the batch culture. In the continuous-culture studies, the batch culture was initially operated for 64.5 h and then continuous flow was started at the dilution rates of 0.15, 0.2, 0.25 and 0.3 day-1 and finally stabilized at 0.25 day-1 within 288 h (12 days). The MAb concentration at steady state was found to be 116-120 microg/day per ml, and the yield of operation was 62.5 mg/day per ml, which was 3.5 times higher than that of batch culture. In conclusion, a packed-bed bioreactor with the support matrix Fibra-Cel, operated in continuous-feeding mode, is more efficient for large-scale MAb production than a batch culture. On the other hand, by using a continuous-culture system, a better supply of nutrients and removal of inhibitory metabolites and proteolytic enzymes was obtained.
authors.affiliation: Medical Biotechnology Department, School of Medical Sciences, Tarbiat Modarres University, Tehran, Iran.
authors.forename: Naghmeh
authors.initials: N
authors.lastname: Golmakany
authors.forename: Mohammad Javad
authors.initials: MJ
authors.lastname: Rasaee
authors.forename: Mehdi
authors.initials: M
authors.lastname: Furouzandeh
authors.forename: Seyed Abbas
authors.initials: SA
authors.lastname: Shojaosadati
authors.forename: Soheila
authors.initials: S
authors.lastname: Kashanian
authors.forename: Kobra
authors.initials: K
authors.lastname: Omidfar
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal / Q000096:biosynthesis* / Q000302:isolation & purification*; D019149:Bioreactors; D002452:Cell Count; D018929:Cell Culture Techniques / Q000379:methods*; D002460:Cell Line; D018914:Cells, Immobilized; D005069:Evaluation Studies as Topic; D005109:Extracellular Matrix / Q000378:metabolism; D005947:Glucose / Q000032:analysis; D006825:Hybridomas / Q000166:cytology / Q000378:metabolism; D007700:Kinetics; D007770:L-Lactate Dehydrogenase / Q000032:analysis; D008567:Membranes, Artificial; D051379:Mice; D008854:Microscopy, Electron; D013997:Time Factors
chemical_list: D000911:Antibodies, Monoclonal; D008567:Membranes, Artificial; D007770:L-Lactate Dehydrogenase; D005947:Glucose