1887

Abstract

Cyclic GMP-AMP (cGAMP) synthase (cGAS) senses cytosolic DNA and catalyses synthesis of the second messenger cGAMP, which activates the downstream signalling adaptor protein STING, leading to the expression of type I interferons. Hepatitis B virus (HBV) is a small DNA virus, and the cGAS-STING pathway may inhibit HBV RNA synthesis and viral assembly in cell culture, but the exact roles of the cGAS pathway in the restriction of HBV replication in infection systems remain to be elucidated. In this study, replication of HBV was significantly inhibited both in cell culture and in a mouse model when the cGAS-STING pathway was activated by dsDNA or cGAMP. In contrast, the presence of enzymatically inactive cGAS mutant did not influence HBV replication. Moreover, knockdown of cGAS in human peripheral blood monocytes led to a higher level of intracellular HBV DNA. Collectively, our data indicate that the cGAS-STING pathway plays a role in the surveillance of HBV infection and may be exploited for development of novel anti-HBV strategies.

Keyword(s): cGAMP , cGAS and HBV replication.
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2016-12-16
2020-01-28
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