The Effect ofHydrocotyle sibthorpioidesLam. Extracts onIn VitroDengue Replication

Abstract

Objective. To investigate the potential effect ofHydrocotyle sibthorpioidesLam. (H. sibthorpioides) extracts againstin vitrodengue viral replication.Methods. The cytotoxicity ofH. sibthorpioideswas evaluated using a cell viability assay. Cells were pre- and posttreated with water and methanol extracts ofH. sibthorpioides, and the viral inhibitory effect was investigated by observing the morphological changes, which were further confirmed by plaque assay.Results. The methanolic extract cytotoxicity was higher in Vero and C6/36 cells than the cytotoxicity of the water extract. Preincubation of the cells withH. sibthorpioidesextract showed nonexistent to mild prophylactic effects. The posttreatment of Vero cells withH. sibthorpioidesmethanolic extract presented higher antidengue activities when compared with the water extract. Surprisingly, posttreatment of C6/36 cells resulted in an enhancement of viral replication.Conclusion.H. sibthorpioideshad variable effects on dengue viral replication, depending on the treatment, cell lines, and solvent types. This study provides important novel insights on the phytomedicinal properties ofH. sibthorpioidesextracts on dengue virus.