Luteolin decreases the yield of influenza A virus in vitro by interfering with the coat protein I complex expression
Abstract
Influenza is an acute transmissible respiratory infectious disease in humans and animals with high morbidity and mortality. It was reported that luteolin, extracted from Chinese herbs, could potently inhibit influenza virus replication in vitro. To assess the effect and explore the fundamental mechanism of luteolin, we infected several cell lines with two subtypes of influenza A virus (IAV), including A/Jiangxi/312/2006 (H3N2) and A/Fort Monmouth/1/1947 (H1N1) and demonstrated that luteolin suppressed the replication of IAV by cytopathic effect reduction method, qRT-PCR, immunofluorescence and Western blot assays. A time-of-addition assay indicated that this compound interfered with viral replication at the early stage of infection. In addition, we found that luteolin suppressed coat protein I complex expression, which was related to influenza virus entry and endocytic pathway. Overall, our findings demonstrated the antiviral effect of luteolin against IAV and its novel antiviral mechanism.
Keywords
Influenza A virus Luteolin Antiviral activity COPINotes
Acknowledgements
This work was supported by the National Nature Science Foundation of China(NSFC) (Grant number: 81621064 and U1303224); The National Science and Technology Major Projects for "Major New Drugs Innovation and Development" (2018ZX09711003) and CAMS Innovation Fund for Medical Sciences (CIFMS) (No. 2017-I2M-3-010).
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
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