title: Using a fed-batch culture strategy to enhance rAAV production in the baculovirus/insect cell system.
abstract: Recombinant adeno-associated virus (rAAV) is one of the most promising vectors for human gene therapy. However, the production systems that are currently available have a limited capacity and cannot provide sufficient quantities of rAAV for preclinical or clinical trials. Many novel methods for improving rAAV production have been developed, but few researchers have focused on the culture process. In this study, we use a fed-batch culture system to enhance rAAV yield in the baculovirus/insect cell system. When the insect cells were co-infected with MOI=5 of Bac-GFP at a ratio of 1:9:9 (Bac-GFP: Bac-Rep: Bac-VP), the fed-batch culture achieved optimal rAAV yields. In batch culture, the optimal cell density for producing rAAV was found to be 1x10(6) cells/ml, and the highest rAAV yield (1.22x10(8) IVP/ml, 122 IVP/cell) occurred at day 5 post-infection. In the fed-batch culture, rAAV yield reached 2.13x10(8) IVP/ml at day 4 post-infection, and the highest rAAV yield was 2.40x10(8) IVP/ml (240 IVP/cell) at day 5 post-infection. The cost of the batch and fed-batch cultures is similar; however, the rAAV yield was 2.6-fold higher in the fed-batch culture system compared with that in the batch culture system. Therefore, here we demonstrated an economical and efficient strategy for rAAV production.
authors.affiliation: Department of Chemical and Materials Engineering, Chang Gung University, 259 Wen-Hwa 1st Road, Kwei-Shan, Tao-Yuan 333, Taiwan.
authors.forename: Yu-Kuo
authors.initials: YK
authors.lastname: Liu
authors.forename: Ching-Jen
authors.initials: CJ
authors.lastname: Yang
authors.forename: Chao-Lin
authors.initials: CL
authors.lastname: Liu
authors.forename: Chia-Rui
authors.initials: CR
authors.lastname: Shen
authors.forename: Lie-Ding
authors.initials: LD
authors.lastname: Shiau
mesh_terms: D000818:Animals; D019149:Bioreactors / Q000821:virology*; D018929:Cell Culture Techniques / Q000379:methods*; D002460:Cell Line; D000229:Dependovirus / Q000254:growth & development* / Q000302:isolation & purification*; D018411:Spodoptera / Q000166:cytology* / Q000821:virology*; D014776:Virus Cultivation / Q000379:methods*