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. 2008 Aug 27;8:65. doi: 10.1186/1472-6750-8-65

Table 3.

Assessment of biological activity of HEK293-produced IFNα2b using two antiviral assays

Antiviral assay IFNα2b activity (U/mg)
HEK293 (1 feed) E. coli HEK293 (2 feeds) E. coli
MDBK/VSV 4.1 × 108 3.1 × 108 12.2 × 108 4.0 × 108
A549/EMCV 6.0 × 108 3.9 × 108 7.2 × 108 8.1 × 108

IFNα2b activity has been determined by inhibition of viral replication of vesicular stomatitis virus (VSV) in Madin Darby bovine kidney cells (MDBK) and of encephalomyocarditis virus (ECMV) in the lung carcinoma cell line A-549. Both antiviral assays were carried out by PBL InterferonSource. In each assay performed independently, E. coli IFNα2b was used as a positive control.