1887

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Volume 88, Issue 1

Antiviral activity obtained from aqueous extracts of the Chilean soapbark tree ( Molina) Free

Abstract

Natural, aqueous extracts of , the Chilean soapbark tree, contain several physiologically active triterpenoid saponins that display strong adjuvant activity when used in either human or animal vaccines. In this paper, we describe studies that demonstrate a novel antiviral activity of extracts against six viruses: vaccinia virus, herpes simplex virus type 1, varicella zoster virus, human immunodeficiency viruses 1 and 2 (HIV-1, HIV-2) and reovirus. We demonstrate that microgram amounts of extract, while exhibiting no cell cytotoxicity or direct virucidal activity, prevent each of the six viruses tested from infecting their host cells. In addition, the presence of residual amounts of extract continue to block virus infection and render cells resistant to infection for at least 16 h after the removal of the extract from the cell culture medium. We demonstrate that a extract possesses strong antiviral activity at concentrations more than 100-fold lower than concentrations that exhibit cell cytotoxicity. Extract concentrations as high as 100 μg ml are not cytotoxic, but concentrations as low as 0.1 μg ml are able to block HIV-1 and HIV-2 virus attachment and infection.

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2007-01-01
2024-04-18
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Antiviral activity obtained from aqueous extracts of the Chilean soapbark tree (Quillaja saponaria Molina)
J. Gen. Virol. 88, 275 (2007); https://doi.org/10.1099/vir.0.82321-0
/content/journal/jgv/10.1099/vir.0.82321-0
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