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Year : 2019  |  Volume : 9  |  Issue : 8  |  Page : 346-352

Cladogynos orientalis Zipp. extracts inhibit cell culture-derived hepatitis C virus genotype 2a replication in Huh-7 cells through NS5B inhibition

1 Department of Microbiology, Faculty of Pharmacy, Mahidol University, Bangkok 10400, Thailand
2 Department of Biochemistry, Faculty of Pharmacy, Mahidol University, Bangkok 10400, Thailand
3 Department of Pharmacognosy, Faculty of Pharmacy, Mahidol University, Bangkok 10400, Thailand

Correspondence Address:
Krit Thirapanmethee
Ph.D., Department of Microbiology, Faculty of Pharmacy, Mahidol University, 447 Sri-Ayuthaya Road, Rajathevi, Bangkok 10400
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Source of Support: The present study was supported by National Research Council of Thailand and Faculty of Pharmacy, Mahidol University, Conflict of Interest: None

DOI: 10.4103/2221-1691.262079

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Objective: To evaluate the potential anti-hepatitis C virus (HCV) activities of Cladogynos orientalis Zipp. ex Span and to investigate the molecular mode of action. Methods: Ethanolic and water extracts from various parts of Cladogynos orientalis were examined for cytotoxicity by MTT assay. Sub-cytotoxic concentrations of the extracts were used for further determining anti-HCV activity using cell culture-derived HCV genotype 2a propagated in HepaRG cell line. Immunofluorescence assay was performed to observe the effect on viruses at the pre-entry step. Mode of action at the post-entry step was investigated for the viral RNA and protein expressions by real time RT-PCR and Western blotting assays, respectively. Results: Although Cladogynos orientalis water extracts exhibited lower cytotoxicity than ethanolic extracts, all ethanolic extracts from roots, stems, and leaves of Cladogynos orientalis exhibited higher anti-HCV activities than water extracts. The highest anti-HCV activity was observed in infected cells treated with the extracts 5 h after absorption. No extracts showed pre-viral entry effect. At the post-viral entry step, only leaf ethanolic extracts inhibited NS5B expression, while all extracts did not inhibit HCV NS3 expression. Conclusions: Cladogynos orientalis ethanolic extracts could be further studied and the major active compound needs to be identified as a promising source for anti-HCV agents.

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