Pilot-Scale Production of Lyophilized Inactivated Rabies Vaccine Candidate in Vero Cells Under Fully Animal Component-Free Conditions Using Microcarrier Technology and Laboratory Animal Trials

Abstract

The upstream process was carried out in an animal component-free medium on Cytodex 1 microcarriers. Recombinant trypsin is a non-animal derived protease used as an alternative to animal-derived trypsin. To inactivate recombinant trypsin, a soybean trypsin inhibitor (STI) should be added to the medium. A protocol was first tested in T-flasks and then passaged to 500 ml and 3 L spinner flasks. Cell detachment was completed in 10–12 min, and 0.4 g/l STI was added to a 3L spinner and cells were transferred into a 30 L stirred tank bioreactor. On day 5, the cell density had reached its maximum (around 1.8 ×106 cells/ml). Cell infection, at an MOI of 0.3 with serum-free medium conditions, yielded a maximal rabies virus titer of 1.82×107 FFU/mL at 5 days. All cell culture conditions and virus growing kinetics in serum-free media were investigated. In conclusion, Vero cells were grown on Cytodex 1 with serum-free media and a high amount of rabies virus was obtained. Immune response to inactivated rabies virus vaccine candidate was determined in mice challenge. Also, we evaluated inactive rabies vaccine candidate safety, and immunogenicity in mice, sheep, horses, and cattle. We found that no horses, sheep, or cattle were given vaccine IM at 3.2 IU/dose exhibited any clinical sign of disease and all developed high VNA titers (up to 10,03 IU/ml) by 3–4 WPI. After the accelerated stability studies, the lyophilized inactivated rabies vaccine candidate showed enough antigenic potency (2.6 IU/ml) in the mouse challenge test. Also, 18-month long-term stability studies showed enough immune response (1.93 IU/ml) on day 14. The activity of the vaccine candidate showed a good immune response and safety criteria that meet WHO requirements. This is the first pilot-scale mammalian cell-based viral rabies vaccine production study using microcarrier technology reported in Turkey.