Journal Article

Putranjivain A from <i>Euphorbia jolkini</i> inhibits both virus entry and late stage replication of herpes simplex virus type 2 <i>in vitro</i>

Hua-Yew Cheng, Ta-Chen Lin, Chien-Min Yang, Kuo-Chih Wang, Liang-Tzung Lin and Chun-Ching Lin

in Journal of Antimicrobial Chemotherapy

Published on behalf of British Society for Antimicrobial Chemotherapy

Volume 53, issue 4, pages 577-583
Published in print April 2004 | ISSN: 0305-7453
Published online April 2004 | e-ISSN: 1460-2091 | DOI:
Putranjivain A from Euphorbia jolkini inhibits both virus entry and late stage replication of herpes simplex virus type 2 in vitro

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Aims: To investigate the in vitro antiviral properties of putranjivain A, isolated from the whole plant of Euphorbia jolkini Bioss (Euphorbiaceae).

Methods and results: Herpes simplex virus (HSV)-2 strain 196-infected Vero cells were used. It was shown that putranjivain A exhibited antiviral activity with an IC50 of 7.9 ± 1.2 µM using the XTT assay, with the IC50 value increasing with increasing multiplicity of infection. Using the plaque reduction assay, the IC50 and IC90 were 6.3 ± 0.8 and 14.5 ± 3.1 µM, respectively. Putranjivain A showed no cytotoxic effect on cell multiplication at concentrations that achieved antiviral activity. The 50% cell cytotoxic concentration (CC50) was 80.3 ± 14.7 µM, and the selectivity index (SI) (ratio of CC50 to IC50) for the XTT and plaque reduction assays was 10.2 and 12.7, respectively. When tested for virucidal activity, putranjivain A significantly reduced viral infectivity at concentrations of 75 and 100 µM, but not at 50 µM or below. The results of the time-of-addition studies suggested that putranjivain A affected the late stage of HSV-2 replication at 25 µM. Interestingly, putranjivain A also showed inhibition of viral attachment and cell penetration. The combination of putranjivain A and aciclovir produced no interaction.

Conclusions: Putranjivain A possesses antiviral activity, inhibiting viral attachment and penetration, and also interfering with the late stage of viral replication.

Keywords: Keywords: antiviral activity, HSV-2, plants

Journal Article.  5038 words.  Illustrated.

Subjects: Medical Oncology ; Critical Care

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