Cells were seeded at a concentration of 4.0 × 104 per well on 96-well microplates and maintained at 37 °C under a humid atmosphere with 5% CO2. After 18 h, the medium was removed and 100 μL of E-MEM/FBS containing different concentrations
(100, 150, 200 and 300 μg/mL) of either QB-90U or Quil A were added to each well in triplicate. The plates were incubated as above; after 48 h, 50 μL of 2 mg/mL MTT (Sigma Chemical Co., Saint Louis, MO, USA) were added to each well and the cells were incubated for a further 4 h. The plates were centrifuged (1400 × g for 5 min) and the supernatant containing the untransformed MTT was carefully removed. CB-839 research buy Ethanol (100 μL/well) was added to solubilize the formazan crystals, and the optical density (OD) was measured in an ELISA reader (Anthos 2020) at 550 nm with a 620 nm reference filter. The amount of formazan produced was directly proportional to the number of living cells in culture. Results selleck chemical were expressed as the percent OD of each culture in comparison with the OD of untreated control cells. Madin Darby Bovine Kidney cells (MDBK; originally ATCC CCL-22) were routinely multiplied in E-MEM/FBS [19]. For virus production, monolayers of MDBK were grown overnight in 150 cm2 flasks and infected with BoHV-5 strain A663 [20] and [21] at a multiplicity of infection of 0.1. When cytopathic
effect was evident in 90–100% of the monolayers, the flasks were frozen at −70 °C, thawed, and the medium was clarified by low speed centrifugation. The viral suspension was inactivated with binary ethylenimine (BEI) as described previously [22]. The median tissue culture infectious doses (TCID50) before inactivation was 107.8/mL. The suspension of inactivated virus (to which we
refer as BoHV-5) was used as antigen for adjuvant testing and for all assays except for the serum neutralization test. Female Rockefeller mice (5–6-weeks old) of the CF-1 breed were purchased from the Fundação Estadual de Produção e Pesquisa em Saúde (FEPPS, Porto Alegre, RS, Brazil), and acclimatized for 72 h prior to use. Mice were maintained under controlled temperature (22 ± 2 °C) and humidity with a 12/12 h light/dark cycle chow and tap Idoxuridine water were provided ad libitum. All the procedures were carried out in strict accordance with the International Legislation on the Use and Care of Laboratory Animals and were approved by the University Committee for Animal Experiments. Mice were divided into six groups, each consisting of six animals. The formulations of BoHV-5 were prepared under aseptic conditions, filtered through 0.22 μm and kept at 4 °C until use. Animals were inoculated subcutaneously (in the hind neck) twice, on days 1 and 14, with 150 μL of BoHV-5 antigen plus 50 μL saline (no adjuvant group), or with either alum (Omega Produtos Quimicos Ltda., 200 μg), Quil A (50 μg) or QB-90U (100 μg) suspended or dissolved in 50 μL saline (alum, Quil A and QB-90U, groups, respectively).
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