[논문]Antiviral activity of hydroalcoholic extract from Eupatorium perfoliatum L. against the attachment of influenza A virus

Derksen, A.; Kuhn, J.; Hafezi, W.; Sendker, J.; Ehrhardt, C.; Ludwig, S.; Hensel, A.

doi:10.1016/j.jep.2016.05.016

Antiviral activity of hydroalcoholic extract from Eupatorium perfoliatum L. against the attachment of influenza A virus

Journal of ethnopharmacology, v.188, 2016년, pp.144 - 152

Derksen, A. , Kuhn, J. , Hafezi, W. , Sendker, J. , Ehrhardt, C. , Ludwig, S. , Hensel, A.

Abstract ▼ AI-Helper

Ethnopharmacological relevance: Aerial parts of Eupatorium perfoliatum have been traditionally used by American natives as a treatment for fever and infections. Also modern phytotherapy in Europe documents the use of hydroalcoholic extracts of this herbal material for the treatment of infections of the upper respiratory tract. Aim of the study: The aim of the present study was to characterize the anti-influenza A virus (IAV) potential of extracts derived from the aerial parts of E. perfoliatum and to identify their antiviral mode of action and potential active fraction's compounds of the extract. Materials and methods: The inhibitory effects of extracts obtained by different organic solvents with different polarities on the cytopathic effect induced by IAV replication was determined in a Madin-Darby Canine Kidney Epithelial (MDCK II) cell-based assay measuring cell viability by MTT stain (MTTIAV assay). Plaque reduction assays were used for investigation of antiviral activity. The mode of action was investigated by different incubation and treatment cycles as well as hemagglutination inhibition assays. Influence of the test extract on tumor necrosis factor (TNF-α) and epidermal growth factor (EGF)-induced cell signaling was analyzed in human lung epithelial (A549) cells. Analytical characterization of extract and fractions obtained from the extract was performed by UHPLC-MS. Results: Hydroalcoholic extracts from the aerial parts of E. perfoliatum were shown to inhibit growth of a clinical isolate of IAV(H1N1)pdm09 I1 and the influenza virus A/Puerto Rico/8/34 (PR8; H1N1) with a half-maximal inhibitory concentration (IC50) of 7@?g/mL and 14@?g/mL, and a selectivity index (SI) (half-maximal cytotoxic concentration (CC50)/IC50)) of 52 and 26, respectively. Extracts prepared with dichloromethane and methanol were inactive. At concentrations >1-10@?g/mL of the hydroalcoholic extract plaque formation of IAV(H1N1)pdm09 was abrogated. The extract was also active against an oseltamivir-resistant isolate of IAV(H1N1)pdm09. The extract blocked attachment of IAV and interfered with virus-induced hemagglutination. TNF-α-induced signal transduction in A549 cells was not affected, while the EGF-induced signaling to phosphorylated ERK was slightly upregulated by the extract. Bioassay-guided fractionation and subsequent LC-MS analysis indicated that the antiviral activity might be due to polyphenolic compounds with higher molecular weights, which strongly interact with stationary phases of different chromatographic systems. These still unknown compounds with probably high molecular weight could not be isolated in the present study. A variety of different flavonoid glycosides and caffeoyl quinic acids obtained from E. perfoliatum did definitely not contribute to the antiviral effect of the extract and its respective fractions. Conclusion: Hydroalcoholic extracts from the aerial parts of E. perfoliatum and its main active polyphenolic constituents protect cells from IAV infection by inhibiting viral attachment to the host cells. The extract appears to be a promising expansion of the currently available anti-influenza agents.

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참고문헌 (29)

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Antiviral activity of hydroalcoholic extract from Eupatorium perfoliatum L. against the attachment of influenza A virus

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