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  • Title: Effect of bafilomycin A1 on the growth of Japanese encephalitis virus in Vero cells.
    Author: Andoh T, Kawamata H, Umatake M, Terasawa K, Takegami T, Ochiai H.
    Journal: J Neurovirol; 1998 Dec; 4(6):627-31. PubMed ID: 10065904.
    Abstract:
    We studied the effect of bafilomycin A1 (Baf-A1), a novel and highly specific inhibitor for vacuolar-type proton (V-H+) pump, on the growth of Japanese Encephalitis virus (JEV) in Vero cells. Viral fluorescence microscopic study showed that Baf-A1 induced the complete disappearance of acidified compartments such as endosomes and lysosomes in Vero cells by the treatment with 0.1 microM Baf-A1 for 1 h at 37 degrees C. In proportion to the disappearance of acidified compartments, virus growth was inhibited when Baf-A1 was present from 1 h before infection to the end of incubation in a dose-dependent manner, or added within as early as 5 min after infection. Conversely, the virus growth was recovered in correlation with the reappearance of acidified compartments after removal of Baf-A1. These results suggest that a low pH condition, which is regulated by Baf-A1-sensitive V-H+ pumps, is essential for the early stage of JEV growth.
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