ISSN:
1573-0778
Keywords:
ceramic bed reactor
;
human fibroblasts
;
perfusion
;
product inhibition
;
t-PA
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
,
Medicine
,
Process Engineering, Biotechnology, Nutrition Technology
Notes:
Abstract Ceramic pieces composed of 99.5% Al2O3, 3 to 6 mm long, were found to be a good matrix for growth of the human embryonic lung diploid fibroblast, IMR-90 cells. The tissue plasminogen activator (t-PA) was secreted in DME medium containing proteose peptone as a t-PA inducer. In addition, production of t-PA was enhanced by increasing extracellular CaCl2, from 3.6 to 5.4 mM. In order to eliminate negative feed-back control caused by t-PA produced and thus raise productivity, perfusion cultivation was performed using a ceramic-packed bed column, with a recirculating vessel. The recirculating vessel was used to mix fresh medium with spent medium, and to control dissolved oxygen concentrations in the extracellular environment by stirring. In continuous production using the packed bed column with 2 kg of ceramics (Ø=H=150 mm), increasing dilution rate to 0.5 day-1 could reduce product inhibition at 3–4×105cells/ml. Cellular productivity of 560 IU/106cells/day was obtained over 40 days and corresponded to the volumetric productivity of 183 IU/ml/day.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00353699
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