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Amaryllidaceae alkaloid cherylline inhibits the replication of dengue and Zika viruses


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Ka, Seydou, Merindol, Natacha, Sow, Aïssatou Aïcha, Singh, Amita, Landelouci, Karima, Plourde, Mélodie B, Pépin, Geneviève, Masi, Marco, Di Lecce, Roberta, Evidente, Antonio, Seck, Matar, Berthoux, Lionel, Chatel-Chaix, Laurent ORCID: https://orcid.org/0000-0002-7390-8250 et Desgagné-Penix, Isabel (2021). Amaryllidaceae alkaloid cherylline inhibits the replication of dengue and Zika viruses Antimicrobial Agents and Chemotherapy , vol. 65 , nº 9. p. 1-19. DOI: 10.1128/aac.00398-21.

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Dengue fever, caused by dengue virus (DENV) is the most prevalent arthropod-borne viral disease, and is endemic in many tropical and sub-tropical parts of the world with an increasing incidence in temperate regions. The closely related flavivirus Zika virus (ZIKV) can be transmitted vertically in utero and causes congenital Zika syndrome and other birth defects. In adults, ZIKV is associated with Guillain-Barré syndrome. There are no approved antiviral therapies against neither viruses. Effective antiviral compounds are urgently needed. Amaryllidaceae alkaloids (AAs) are a specific class of nitrogen-containing compounds produced by plants of the Amaryllidaceae family with numerous biological activities. Recently, the AA lycorine was shown to present strong antiflaviviral properties. Previously, we demonstrated that Crinum jagus contained lycorine and several alkaloids of cherylline, crinine and galanthamine-types with unknown antiviral potential. In this study, we explored their biological activities. We show that C. jagus crude alkaloid extract inhibited DENV infection. Among the purified AAs, cherylline inhibited efficiently both DENV (EC(50)=8.8 μM) and ZIKV replication (EC(50)=20.3 μM), but had no effect on HIV-1 infection. Time-of-drug-addition and -removal experiments identified a post-entry step as the one targeted by cherylline. Consistently, using subgenomic replicons and replication-defective genomes, we demonstrate that cherylline specifically hinders the viral RNA-synthesis step but not viral translation. In conclusion, AAs are an underestimated source of antiflavivirus compounds, including the effective inhibitor cherylline that could be optimized for new therapeutic approaches.

Type de document: Article
Mots-clés libres: Amaryllidaceae; Zika Virus; Alkaloids; Antivirals; Cherylline; Dengue Virus; Flavivirus; Lycorine
Centre: Centre INRS-Institut Armand Frappier
Date de dépôt: 22 juin 2022 19:38
Dernière modification: 22 juin 2022 19:38
URI: https://espace.inrs.ca/id/eprint/12358

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