Abstract
Herpes viruses (HSV) are among the most common viruses that infect humans. They cause blisters and inflammation of the oral and genital mucosa as well as severe symptoms such as blindness, hearing impairment and fatal encephalitis. Although acyclovir (ACV) and its derivatives are highly effective in treating recurrent lytic infections, the emergence of resistant strains remains a concern. In this study, the in vitro anti-herpetic activity of a hydroalcoholic extract obtained from the brown seaweed Sargassum fluitans, collected from strandings in Cuba, was evaluated. The hydroalcoholic extract was not cytotoxic in Vero cells (CC50 >5000 µg mL-1) and inhibited replication of HSV-1 (ACV-susceptible and -resistant) and HSV-2 (ACV-resistant) strains with EC50 of 271.66, 403.62 and 14.99 µg mL-1 respectively. In addition, first studies about mechanism of action were evaluated with ACV-sensitive HSV-1 model. The extract showed strong inhibition when pre-incubated with the virus and when the extract and virus were added simultaneously on the cells. The protection of Vero cells during the post-infection assay was very effective up to 1 h. A high resolution UPLC/MS-MS analysis detected 139 compounds, of which 44 were identified. In silico analysis was performed to determine the putative interaction sites of two flavones of interest identified in the extract with the viral glycoprotein D (gD). Molecular docking analysis revealed that takakin and tectorigenin mainly interact with the gD protein active center through hydrophobic interactions (Leu44, Pro50, Thr174, Lys169, Tyr208, Gln209) while hydrogen bonding interactions are less abundant (Ser43, Asp46, Lys169, Tyr208). This research represents a contribution to the valorization of S. fluitans as a source of anti-herpetic compounds in the context of recurrent and abundant seaweed strandings.
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The data that support the findings of this study are available from the corresponding author, [NB].
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Funding
This research was funded by French Embassy Research Scholarship 2021-2022, Laboratoire de Biotechnologie et Chimie Marines (LBCM), Université Bretagne Sud (UBS), France and by ISblue project, Interdisciplinary graduate school for the blue planet (ANR-17-EURE-0015) and co-funded by a grant from the French government under the program "Investissements d'Avenir".
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Authors and Affiliations
Contributions
Conceptualization: Liena de Regla Ponce Rey, Laurent Picot, Nathalie Bourgougnon
Methodology: Liena de Regla Ponce Rey, Hugo Pliego-Cortés, Christel Marty, Enrique Colina Araujo, Sonia Resik Aguirre, Idania Rodeiro Guerra, Pierre Edouard Bodet, Laurent Picot, Nathalie Bourgougnon
Software: Liena de Regla Ponce Rey, Hugo Pliego-Cortés, Christel Marty, Enrique Colina Araujo, Pierre Edouard Bodet
Validation: Sonia Resik Aguirre, Rodeiro Guerra, Laurent Picot, Nathalie Bourgougnon
Formal analysis: Liena de Regla Ponce Rey
Investigation: Liena de Regla Ponce Rey, Laurent Picot, Nathalie Bourgougnon
Resources: Idania Rodeiro Guerra, Laurent Picot, Nathalie Bourgougnon
Data curation: Liena de Regla Ponce Rey
Writing—original draft preparation: Liena de Regla Ponce Rey
Writing—review and editing: Liena de Regla Ponce Rey, Hugo Pliego-Cortés, Enrique Colina Araujo, Pierre Edouard Bodet, Laurent Picot, Nathalie Bourgougnon
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Supervision: Laurent Picot, Nathalie Bourgougnon
Project administration: Nathalie Bourgougnon
Funding acquisition: Nathalie Bourgougnon
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Ponce Rey, L., Pliego-Cortés, H., Marty, C. et al. In vitro antiherpetic activity of compounds extracted from Sargassum fluitans (Børgesen) Børgesen. Identification and in silico evaluation of potential antiviral molecules in a hydroalcoholic extract. J Appl Phycol (2024). https://doi.org/10.1007/s10811-024-03202-4
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DOI: https://doi.org/10.1007/s10811-024-03202-4