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| Author(s): |
Adriana Lages Lima Galesi
Total Authors: 1
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| Document type: | Doctoral Thesis |
| Press: | Campinas, SP. |
| Institution: | Universidade Estadual de Campinas (UNICAMP). Faculdade de Engenharia Química |
| Defense date: | 2007-12-07 |
| Examining board members: |
Angela Maria Moraes;
Soraia Attie Calil Jorge;
Elisabeth de Fatima Pires Augusto;
Claudio Alberto Torres Suazo;
Marcia Regina da Silva Pedrini
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| Advisor: | Carlos Augusto Pereira; Angela Maria Moraes |
| Abstract | |
Insect cells have been intensively employed to obtain recombinant proteins due to some advantages over mammalian cells, and the Drosophila melanogaster Schneider 2 cell line is one of the expression systems used for this purpose. Nevertheless, literature is scarce with regard to metabolism and culture of these cells, what motivated the development of this work. The aim of this study was to establish an adequate culture medium to cultivate Drosophila melanogaster Schneider 2 cells transfected for the expression of the rabies virus glycoprotein (GPV), and to evaluate their behaviour in different formulated media. For this, the factorial design strategy was employed. The effects of glucose, glutamine, whey protein concentrate, yeastolate, soy hydrolysate, lactoalbumin hydrolysate, lipid emulsion and Pluronic F68 were studied over cell growth and viability, aiming to reduce the fetal bovine serum percentage from the culture medium. Adjusting the concentration of these distinct compounds, serum was eliminated, mainly due to the addition of yeastolate, and cell concentration was higher in several of the developed formulations than that achieved with basal TC100 medium supplemented with 10% of serum. The formulated medium which resulted in best cell performance was composed by TC100 containing 10 g/L of glucose, 3.5 g/L of glutamine, 3 g/L of yeastolate, 1% (v/v) of lipid emulsion and 0.1% (w/v) of Pluronic F68. When in bioreactor, initially the cells did not reproduce the growth behavior observed in smaller scale. However, increasing Pluronic F68 percentage to 0.6%, this limitation was circunvended. Glucose was not the limiting substrate in formulated culture media and lactate was produced in low quantities. Despite ammonium was produced in high concentrations, this compound did not influence cell growth. Glycoprotein quantification shows that cells did not loose their expression capacity after adaptation in the different media, and that glycoprotein production in the formulated medium was higher than that obtained in SF900 II medium and TC100 medium containing 10% of fetal bovine serum (AU) | |