Ethanolic extracts of 20 medicinal plants were screened for influenza virus NA inhibition and in vitro
antiviral activities using MDCK cells in an MTT assay. The vaccine proteins of influenza virus A/New
Caledonia/20/99 (H1N1), mouse-adapted influenza virus A/Guizhou/54/89 (A/G)(H3N2) and mouseadapted
influenza virus B/Ibaraki/2/85 (B/I) were used in the NA inhibition assay, and mouse-adapted
influenza viruses A/PR/8/34 (H1N1), A/G and B/I were used in the in vitro antiviral assay. The results of
the in vitro antiviral assay indicated that the A/G virus was the most susceptible and an extract of the
leaf of CS possessed the highest in vitro anti-A/G virus activity (41.98%). Therefore, the A/G virus and
the CS extract were selected for studying in vivo anti-influenza virus activity. BALB/c mice were treated
with CS extract (100 mg/kg per day, 5 times) orally from 4 hr before to 4 days after infection. CS extract
elicited significant production of anti-influenza virus IgG1 antibody in BAW and increased mouse weight
compared to oseltamivir (0.1 mg/kg per day) on day 19 or water on days 17–19 of infection. Moreover, CS
extract produced a higher anti-influenza virus IgA antibody level in BAW compared to oseltamivir, and
a tendency towards an increase in anti-influenza virus IgA compared to water was shown. The results
suggest that CS extract has a protective effect against influenza virus infection.
Ethanolic extracts of 20 medicinal plants were screened for influenza virus NA inhibition and in vitroantiviral activities using MDCK cells in an MTT assay. The vaccine proteins of influenza virus A/NewCaledonia/20/99 (H1N1), mouse-adapted influenza virus A/Guizhou/54/89 (A/G)(H3N2) and mouseadaptedinfluenza virus B/Ibaraki/2/85 (B/I) were used in the NA inhibition assay, and mouse-adaptedinfluenza viruses A/PR/8/34 (H1N1), A/G and B/I were used in the in vitro antiviral assay. The results ofthe in vitro antiviral assay indicated that the A/G virus was the most susceptible and an extract of theleaf of CS possessed the highest in vitro anti-A/G virus activity (41.98%). Therefore, the A/G virus andthe CS extract were selected for studying in vivo anti-influenza virus activity. BALB/c mice were treatedwith CS extract (100 mg/kg per day, 5 times) orally from 4 hr before to 4 days after infection. CS extractelicited significant production of anti-influenza virus IgG1 antibody in BAW and increased mouse weightcompared to oseltamivir (0.1 mg/kg per day) on day 19 or water on days 17–19 of infection. Moreover, CSextract produced a higher anti-influenza virus IgA antibody level in BAW compared to oseltamivir, anda tendency towards an increase in anti-influenza virus IgA compared to water was shown. The resultssuggest that CS extract has a protective effect against influenza virus infection.
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