The emergence of oseltamivir-resistant variants of influenza
virus has highlighted the necessity for the development of
more effective novel antiviral drugs. To date, numerous researchers
have focused on developing antiviral drugs using
natural resources, such as traditional herbal medicines. Poncirus
trifoliata is widely used in oriental medicine as a remedy
for gastritis, dysentery, inflammation and digestive ulcers. In
this study, we investigated the potential antiviral effect of the
Poncirus trifoliata orange seed extract against influenza virus.
An ethanol extract of Poncirus trifoliata seeds (PTex) inhibited
the activity of influenza viruses, in particular, oseltamivir-
resistant strains, in Madin-Darby canine kidney cells. In
contrast to oseltamivir, PTex exerted a significant inhibitory
effect on the cellular penetration pathway of the virus rather
than HA receptor binding. The potent antiviral effect and novel
working mechanism of PTex support its further development
as an effective natural antiviral drug with a wide spectrum
of activity against influenza and oseltamivir-resistant
viruses.
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