Abstract
The Ibaraki virus (IBAV) causes Ibaraki disease in cattle. Our previous studies have shown that IBAV uses macropinocytosis to enter the host cell and exit from the endosome to the cytosol in response to endosomal acidification. To further explore the mechanism of IBAV infection and replication, we examined the effect of inhibitors of mitochondrial oxidative phosphorylation, carbonyl cyanide m-chlorophenyl hydrazone (CCCP) and antimycin A, on IBAV propagation. These inhibitors significantly suppressed IBAV propagation, with reduced cellular ATP levels resulting from suppression of ATP synthesis. Furthermore, we identified AMP-activated protein kinase (AMPK), which is activated by CCCP or antimycin A, as a key signaling molecule in IBAV suppression. We also observed that IBAV infection induces ATP depletion and increases AMPK activity. Our findings suggest that AMPK is a potential target in Ibaraki disease.
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