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Journal of Medicinal Plants Research Vol. 6(12), pp. 2261-2265, 30 March, 2012<br />

Available online at http://www.academicjournals.org/JMPR<br />

DOI: 10.5897/JMPR10.040<br />

ISSN 1996-0875 ©2012 <strong>Academic</strong> <strong>Journals</strong><br />

Full Length Research Paper<br />

Screening of Brazilian plants for antiviral activity<br />

against animal herpesviruses<br />

M. J. B. Fernandes*, A. V. Barros, M. S. Melo and I. C. Simoni<br />

Centro de P&D de Sanidade Animal, Instituto Biológico, São Paulo, Brazil.<br />

Accepted 22 June, 2010<br />

In a screening of Brazilian plants, extracts from 27 species were assayed in vitro for antiviral activity<br />

against bovine and suid herpesviruses type 1. The plants considered promising as source of antiviral<br />

substances were those that presented viral inhibition index equal or more than 1.5 meaning a difference<br />

of viral titers between treated and untreated infected cells. Out of the 27 plants tested, extracts of<br />

Bumelia sertorum, Coffea arabica, Endopleura uchi, Leandra purpurescens, Psidium cattleianum and<br />

Uncaria tomentosa showed antiviral activity for both viruses. Extracts of Prunus myrtifolia and<br />

Symphyopappus compressus were active only against bovine herpesvirus while those of Bauhinia<br />

blakeana, Origanum vulgare, Ricinus communis and Tibouchina mutabilis inhibited only suid<br />

herpesvirus. Most of these plants are part of Brazilian folk medicine warranting the ethnopharmacology<br />

as an efficient strategy for selecting the plants for antiviral studies. Plants that presented activity<br />

against both animal herpesviruses are promising for further studies as antiviral components source.<br />

Key words: Brazilian plants, cytotoxicity, suid and bovine herpesviruses type 1, antiviral activity.<br />

INTRODUCTION<br />

Researches on natural products have significantly<br />

progressed over the last decades, mainly on plants<br />

corroborating their importance to the discovery of new<br />

biological and medicinal agents (Rates, 2001; Newman et<br />

al., 2003; Calixto, 2000). Treatment of viral infections with<br />

synthetic substances is often unsatisfactory and limited<br />

due a narrow spectrum of activity, limited therapeutic<br />

usefulness, toxicity and resistant viral strains (Martim and<br />

Ernest, 2003; Chattopadhyay and Naif, 2007). Many<br />

plants have been reported to have antiviral activity and<br />

may serve as promising sources of novel viral prototypes<br />

(Cowan, 1999; Jassim and Naji, 2003; Martim and<br />

Ernest, 2003; Chattopadhyay and Naif, 2007).<br />

In the veterinary area, the bovine (BoHV-1) and the<br />

suid (SuHV-1) herpesviruses are important pathogens,<br />

because of the significant economic losses incurred by<br />

diseases and trading restrictions. BoHV-1 is a major<br />

pathogen of cattle, causing infection bovine<br />

*Corresponding author. E-mail: judite@biologico.sp.gov.br. Tel:<br />

+551150871714. Fax: +551150871791.<br />

rhinotracheitis (IBR) and abortions (Muylkens et al.,<br />

2007). SuHV-1 causes the Aujeszky’s disease (ADV) or<br />

pseudorabies (Nauwynck, 1997; Groff et al., 2005). The<br />

aim of the present work is to assess the in vitro antiviral<br />

activity of 27 Brazilian plant extracts against these two<br />

animal herpesviruses together with studies of cytotoxicity,<br />

because Brazil has the largest tropical forest in the world,<br />

where medicinal plants are most abundant.<br />

MATERIALS AND METHODS<br />

Plants<br />

The 27 plant species used in this study are as shown in Table 1.<br />

Majority of the plants were collected in Serra do Itapeti Municipal<br />

Natural Park, Mogi das Cruzes, São Paulo (SP) State, Brazil during<br />

2004 to 2005. Only Coffea arabica, Ligustrum lucidum, Morus nigra,<br />

Potomorphe umbellata and Ricinus communis were from the park<br />

to the Instituto Biológico, São Paulo/SP. The plant specimens were<br />

identified and authenticated by botanist Dra. Inês Cordeiro, of the<br />

Instituto de Botânica de São Paulo, São Paulo by comparison with<br />

exsiccates deposited at this herbarium. The crude aqueous extracts<br />

(CAE) were obtained from dried leaves which were powdered,<br />

dissolved in sterile distilled water (10%, w/v) and maintained<br />

overnight at 4°C. Then, CAE were filtered on filter paper and were

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