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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