title: Baculovirus-mediated production of HDV-like particles in BHK cells using a novel oscillating bioreactor.
abstract: We have recently demonstrated the assembly of hepatitis delta virus-like particles (HDV VLP) by co-transducing hepatoma cells using two recombinant baculoviruses, one encoding hepatitis B surface antigen (HBsAg), and one encoding large delta antigen (L-HDAg). In this study, we further demonstrated the assembly and secretion of VLP in other mammalian cells. The assembly efficiency varied depending on cell lines, the baculovirus constructs and the relative dosage of both recombinant viruses. The co-transduction of BHK cells led to the formation of VLPs resembling authentic virions in size and appearance. The production process was transferred to a novel oscillating packed bed bioreactor, BelloCell, in which the transduction efficiency was up to approximately 90% for a high cell density of 1.5 x 10(7) cells/cm(3) bed and a total yield of 427 microg based on HBsAg in the VLP (harvested from 940 ml medium) was obtained. The particle yield corresponded to an average volumetric yield of 454 ngml(-1) and a specific yield of 285 microg/10(9) cells, and is significantly superior to that can be obtained by the commonly employed transfection method. The combination of baculovirus transduction and BelloCell reactor, thus, may represent a simple and efficient approach for the production of HDV VLP and viral vectors.
authors.affiliation: Department of Chemical Engineering, National Tsing Hua University, Hsinchu 300, Taiwan.
authors.forename: Yi-Heng
authors.initials: YH
authors.lastname: Chen
authors.forename: Jaw-Chin
authors.initials: JC
authors.lastname: Wu
authors.forename: Kuei-Chun
authors.initials: KC
authors.lastname: Wang
authors.forename: Ying-Wei
authors.initials: YW
authors.lastname: Chiang
authors.forename: Chia-Wei
authors.initials: CW
authors.lastname: Lai
authors.forename: Yao-Chi
authors.initials: YC
authors.lastname: Chung
authors.forename: Yu-Chen
authors.initials: YC
authors.lastname: Hu
mesh_terms: D000818:Animals; D016367:Baculoviridae; D019149:Bioreactors; D006367:HeLa Cells; D003698:Hepatitis Delta Virus / Q000235:genetics*; D035923:Hepatitis delta Antigens / Q000096:biosynthesis* / Q000235:genetics; D006801:Humans; D019065:Virus Assembly / Q000235:genetics*
chemical_list: D035923:Hepatitis delta Antigens