Biological and Biochemical Characterization of M2B Cells: Classical BSE Prion is Conserved in Transgenic Mice Overexpressing Bovine Prion Protein Gene

M2B cells with persistent classical bovine spongiform encephalopathy (C-BSE) have been established previously. In this study, we performed strain characterization of the M2B cell line in bovine PrPC overexpressing mice (Tg 1896). Mice intracranially inoculated with M2B cells and C-BSE survived for 451 +/- 7 and 465 +/- 31 d post inoculation, respectively. Although biochemical properties, including deglycosylation and conformational stability, differed between M2B cells and C-BSE, inoculation with M2B cell lysate and C-BSE resulted in comparable phenotypes. Comparable vacuolation scores and PrPSc depositions were observed in the brain of Tg 1896 inoculated with both M2B cell lysate and C-BSE. Our results show that biochemical and biological characteristics of M2B cells and C-BSE are classifiable in the same strain.