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BMC Complementary Medicine and Therapies
Published in: BMC Complementary Medicine and Therapies 1/2017

Open Access 01-12-2017 | Research article

Characterization and mechanisms of anti-influenza virus metabolites isolated from the Vietnamese medicinal plant Polygonum chinense

Authors: Thu Thi Tran, Meehyein Kim, Yejin Jang, Hye Won Lee, Hoa Thi Nguyen, Thanh Ngoc Nguyen, Hae Woong Park, Quang Le Dang, Jin-Cheol Kim

Published in: BMC Complementary Medicine and Therapies | Issue 1/2017

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Abstract

Background

Polygonum chinense Linn. is a common medicinal plant in Southeast Asia and has been used in traditional medicine in Vietnam. The plant contains phytochemicals with various biological properties; however, its antiviral effect has not yet been demonstrated. This study was aimed to evaluate the anti-influenza virus activity of crude extracts of P. chinense, to characterize antiviral metabolites therefrom and to investigate their mechanisms of antiviral action.

Methods

The methanol (MeOH) extract and organic solvent layers of P. chinense were prepared by extraction and partition with relevant solvents. The ethyl acetate (EtOAc) layer showing antiviral activity was chromatographed repeatedly on SiO2 and Sephadex LH-20 columns to give eight pure metabolites. Their chemical structures were determined by NMR and MS spectral data. Anti-influenza virus activity of the eight metabolites against virus strains A/Puerto Rico/8/34 (H1N1, PR8), A/Hong Kong/8/68 (H3N2, HK) and B/Lee/40 (Lee) was evaluated on the basis of cytopathic effect (CPE) and plaque inhibition assays. Time-of-addition, confocal microscopy and neuraminidase inhibition assay were performed for mode-of-action studies of active ingredients.

Results

The MeOH extract of P. chinense showed anti-influenza virus activity with EC50 values ranging from 38.4 to 55.5 μg/mL in a CPE inhibition assay. Among the eight pure metabolites isolated from P. chinense, ellagic acid (PC5), methyl gallate (PC7) and caffeic acid (PC8) significantly inhibited viral replication in a dose-dependent manner in both plaque inhibition and CPE inhibition assays with EC50 values ranging from 14.7 to 81.1 μg/mL and CC50 values higher than 300 μg/mL. Mode-of-action studies suggested that PC5 and PC7 suppress virus entry into or replication in cells, while PC8 targets influenza viral neuraminidase, even oseltamivir-resistant one.

Conclusion

These results demonstrated that P. chinense and its metabolites possess effective anti-influenza virus activities. The botanical materials of P. chinense could be a promising multitargeted inhibitor of influenza A and B viruses and applied to development of a novel herbal medicine.
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Metadata
Title
Characterization and mechanisms of anti-influenza virus metabolites isolated from the Vietnamese medicinal plant Polygonum chinense
Authors
Thu Thi Tran
Meehyein Kim
Yejin Jang
Hye Won Lee
Hoa Thi Nguyen
Thanh Ngoc Nguyen
Hae Woong Park
Quang Le Dang
Jin-Cheol Kim
Publication date
01-12-2017
Publisher
BioMed Central
Published in
BMC Complementary Medicine and Therapies / Issue 1/2017
Electronic ISSN: 2662-7671
DOI
https://doi.org/10.1186/s12906-017-1675-6

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