Antimicrobial activity of Pterogyne nitens Tul., Fabaceae, against opportunistic fungi

Atividade antimicrobiana de Pterogyne nitens Tul., Fabaceae, contra fungos oportunistas

ARTICLE

Antimicrobial activity of Pterogyne nitens Tul., Fabaceae, against opportunistic fungi

Atividade antimicrobiana de Pterogyne nitens Tul., Fabaceae, contra fungos oportunistas

Luis Octávio RegasiniI, ^*; Marcos Pivatto^I; Liliana Scorzoni^II; Tatiane Benaducci^II; Ana Marisa Fusco-Almeida^II; Maria José Soares Mendes Giannini^II; Eliezer Jesus Barreiro^III; Dulce Helena Siqueira Siva^I; Vanderlan da Silva Bolzani^I

^IDepartamento de Química Orgânica, Instituto de Química, Universidade Estadual Paulista "Júlio de Mesquita Filho", Rua Prof. Francisco Degni s/n, 14800-900 Araraquara-SP, Brazil

^IIDepartamento de Análises Clínicas e Toxicológicas, Faculdade de Ciências Farmacêuticas, Universidade Estadual Paulista "Júlio de Mesquita Filho", Rodovia Araraquara-Jaú, km 1, 14801-902 Araraquara-SP, Brazil

^IIICentro de Ciências da Saúde, Faculdade de Farmácia, Universidade Federal do Rio de Janeiro, Cidade Universitária, 21944-910 Rio de Janeiro-RJ, Brazil

ABSTRACT

As part of our ongoing research on antifungal agents from Brazilian flora, eight extracts and twelve fractions from Pterogyne nitens Tul., Fabaceae, were screened for antimicrobial activity against four opportunistic fungi species (Candida albicans, Candida krusei, Candida parapsilosis and Cryptococcus neoformans) using a broth microdilution method. The present investigation reveals that P. nitens extracts and fractions were more effective against C. krusei and C. parapsilosis than against C. neoformans. The growth of C. albicans was moderately affected by all tested extracts and fractions. The strongest effects were observed for n-butanol fractions from branches (MIC = 15.6 μg/mL) and roots (MIC = 31.2 μg/mL) against C. krusei. Additionally, the chromatographic fractionation of the n-butanol fraction from branches afforded four guanidine alkaloids; N-1,N-2,N-3-triisopentenylguanidine (1), described for the first time in the Fabaceae family, and nitensidines A-C (2-4), which showed moderate activity towards C. krusei (MIC = 62.5 μg/mL) and C. parapsilosis (MIC = 31.2 μg/mL).

Keywords:Pterogyne nitens, guanidine alkaloids, antifungal, opportunistic fungi, Candida spp., Cryptococcus neoformans.

RESUMO

No contexto de nossas pesquisas por novos agentes antifúngicos obtidos da flora brasileira, oito extratos e doze frações de Pterogyne nitens Tul., Fabaceae, foram submetidos ao ensaio antifúngico pelo método de microdiluição, contra quatro espécies de fungos oportunistas, Candida albicans, Candida krusei, Candida parapsilosis e Cryptococcus neoformans. Este trabalho revelou que os extratos e frações de P. nitens foram mais ativos contra C. krusei e C. parapsilosis quando comparados a C. neoformans, sendo que o crescimento de C. albicans foi moderadamente afetado por todos os extratos e frações. As atividades mais potentes foram observadas para as frações n-butanólica dos galhos (CIM = 15,6 μg/mL) e raízes (CIM = 31,2 μg/mL) contra C. krusei. Adicionalmente, a fração n-butanólica dos galhos foi submetida ao fracionamento cromatográfico, resultando no isolamento de quatro alcaloides guanidínicos, sendo N-1,N-2,N-3-tri-isopentenilguanidina (1), descrito pela primeira vez em espécies da família Fabaceae e nitensidinas A-C (2-4), os quais apresentaram atividade antifúngica moderada contra C. krusei (CIM = 62,5 μg/mL) e C. parapsilosis (CIM = 31,2 μg/mL).

Unitermos:Pterogyne nitens, alcaloides guanidínicos, antifúngico, fungos oportunistas, Candida spp., Cryptococcus neoformans.

INTRODUCTION

The clinical relevance of opportunistic fungal infections have increased at an alarming rate in the second half of the twentyth century, including individuals infected with HIV, transplant recipients and patients with cancer (Clark & Hajjeh, 2002; Hage et al., 2002). The most frequent causing agents of such infections are Candida, Aspergillus species, Cryptococcus neoformans, Mucor and some unusual genera such as Fusarium, Trichosporon, and Scedosporium (Guarro et al., 2006; Nucci & Anaissie, 2007). Furthermore, the most common treatment for these infectious diseases involves azoles and polyene macrolides, which are limited in their spectrum, and presenting severe side effects (Helmerhorst et al., 1999). For this reason, there is a need for new antifungal compounds which can serve as lead compounds for further development in antifungal chemotherapy. In this way, plants have been proven to be a rich source of antimicrobial agents (Vieira et al., 2005, Alves et al., 2006; Dias et al., 2006; Sena Filho et al., 2006; Oliveira et al., 2007; Batista-Júnior et al., 2008; Cardoso-Lopes et al., 2008; Lopes et al., 2008; Tempone et al., 2008; Bertucci et al., 2009; Costa et al., 2009; Regasini et al., 2009a; Silva-Júnior et al., 2009).

Pterogyne nitens Tul., Fabaceae, is popularly named in South America as "tipa", "yvi-raró", "cocal", "amendoinzeiro", "bálsamo" and "amendoim-bravo" according to the region where this plant grows. It is a sole beautiful legume tree from Pterogyne genus, which is distributed mainly in Brazil, Bolivia, Paraguay and Argentina, reaching 5-12 m height (Burkart, 1952; Lorenzi, 1998). Cold aqueous preparations using stem barks has been used as folk medicine for treating of ascaridiasis (Crivos, 2007). Previous chemical and biological studies have demonstrated the presence of guanidine alkaloids, which exhibited cytotoxic activity against to human cancer cell lines (Bolzani et al., 1995; Ferreira et al., 2009; Regasini et al., 2007, 2009b,c) and phenolics with myeloperoxidase inhibitory and radical scavenging activities (Fernandes et al., 2008; Regasini et al., 2008a,b,c; Souza et al., 2009; Souza et al., 2010).

Thus, the aim of this investigation was to evaluate the antimicrobial activity of extracts and fractions from branches, green fruits, roots and stem barks and isolated terpene guanidine alkaloids from P. nitens against four opportunistic human yeasts (Candida albicans, C. krusei, C. parapsilosis and Cryptococcus neoformans), by using broth microdilution test.

MATERIAL AND METHODS

Plant material

Roots, branches, green fruits and stem barks of Pterogyne nitens Tul., Fabaceae, were collected in the Botanic Garden of São Paulo (São Paulo, Brazil) by Ph.D. Maria C. M. Young in January 2005 and identified by Ph.D. Inês Cordeiro (IBt-SMA). A voucher specimen (SP 204319b) was deposited at the State Herbarium "Maria Eneida Kaufmann" of Institute of Botany (São Paulo, Brazil).

Extraction

The powdered shade-dried plant material was extracted three times (72 h) by maceration with hexane and, subsequently with ethanol. The solvent was removed under reduced pressure by rotary evaporation yielding a thick syrup. The crude ethanol extracts were further reconstituted in methanol-water (7:3) and then partitioned with ethyl acetate and n-butanol, successively. Samples from hexane and ethanol extracts, ethyl acetate, n-butanol and lyophilized hydroalcoholic fractions, were submitted to antimicrobial tests.

Isolation of antifungal compounds 1-4

The n-butanol fraction (2.5 g) from the ethanol extract of branches was subjected to gel permeation column chromatography using Sephadex LH-20, eluted with methanol to afford nine fractions (B1-B9), which were combined after comparison of their TLC profile [chloroform:methanol (9:1)] revealed with Dragendorff´s reagent. The alkaloidal fraction (B2, 587 mg) was subjected to reversed-phase C-18 silica gel CC eluted with acetonitrile:water gradient that afforded eight fractions (ALK1-ALK8). Purification of fraction ALK5 (121 mg) by repeated CC over silica gel (230-400 mesh) eluted with chloroform:methanol in a gradient ranging from 0 to 35% methanol, furnished N-1,N-2,N-3-triisopentenylguanidine (1, 7 mg) and nitensidine B (3, 12 mg). Fraction ALK-8 (88 mg) was subject to preparative TLC developed with chloroform:methanol:triethylamine (87:12.5:0.5), developed three times to yield nitensidine A (2, 7 mg) and nitensidine C (4, 3 mg).

The molecular structures of these guanidine alkaloids were identified through ¹H NMR, ¹³C NMR and MS data. The spectral data were in agreement with those published in the literature (Bolzani et al., 1995; Conegero et al., 2003).

Microorganisms and growth conditions

The test organisms C. albicans ATCC 90028, C. krusei ATCC 6258, C. parapsilosis ATCC 22019 and C. neoformans ATCC 90012 were originally obtained from the Mycology Laboratory of the Department of Clinical Analysis, School of Pharmaceutical Sciences at São Paulo State University (UNESP). The yeasts were grown and maintained on Sabouraud-dextrose agar for 24 to 48 h at room temperature.

Antimicrobial susceptibility testing

The antifungal activity tests were performed using broth microdilution method as described in the M27-A2 document of Clinical and Laboratory Standards Institute (CLSI) with modifications (Rodriguez-Tudela et al., 2003). The medium used was RPMI 1640 with L-glutamine buffered to pH 7.0 with 0.165 M morpholinepropanesulfonic acid (MOPS), supplemented with 2% glucose. Samples were diluted in DMSO and each well of a 96-well U-bottomed culture plate were added 100 μL culture together with 100 μL of 2-fold serial diluted test compound. The cell suspension was prepared in 0.85% saline with an optical density equivalent to McFarland 0.5 and diluted 1:100 in RPMI for the final concentration to be 1 x 10⁵ to 5 x 10⁵ CFU/mL. This suspension was inoculated on the microdilution plate previously prepared with the extracts, fractions and compounds 1-4 diluted at concentrations ranging from 1000 to 0.48 μg/mL. The plates were incubated with agitation at 37 °C for 24 h for Candida spp. and 48 h for C. neoformans. Amphotericin B and fluconazole were used as positive controls exhibiting a MIC value ranging from 2.00 to 0.06 and 64.00 to 2.00 μg/mL (Table 1).

The MIC values were calculated as the lowest concentration of the test samples which shows complete growth inhibition of the fungi strains. Results were analyzed visually and spectrophotometrically. All assays were performed in triplicate. The extracts and fractions showing a MIC lower than 100, ranging from 100-500, 500-1000 and over 1000 μg/mL were considered potent, moderated, weak and not active, respectively (Holetz et al., 2002).

Minimum fungicidal concentration (MFC)

All tested samples in antifungal study showing MIC<1000 μg/mL, were transferred to plates of Sabouraud-dextrose agar. The plates were incubated at 35 ºC for 48 h (yeast). The MFC was defined as the lowest concentration of the extract that did not permit any visible fungal colony growth on the appropriate agar plate after the period of incubation. All assays were performed in triplicate.

RESULTS

In this work, eight extracts and twelve fractions as well as four guanidine alkaloids (1-4) were tested at concentrations ranging from 1000 to 0.48 μg/mL against four human opportunistic yeasts (C. albicans, C. krusei, C. parapsilosis and C. neoformans). These results were summarized in Table 1.

All extracts and fractions from Pterogyne nitens Tul., Fabaceae, were weakly active against the yeast C. albicans with MIC values ranging from 1000 to 250 μg/mL, which were considered moderate to weak according to Holetz et al. (2002). The hexane extract from roots was not active to C. albicans and C. neoformans (MIC>1000 μg/mL). The extracts and fractions from roots and green fruits demonstrated moderate activity against C. krusei, except the n-butanol fraction from roots, which presented strong activity (MIC 31.2 μg/mL) against this yeast. Additionally, branches and stem barks exhibited potent activity against C. krusei with MIC values ranging from 15.6 to 62.5 μg/mL and the best result was observed for the n-butanol fraction from branches (MIC = 15.6 μg/mL). Furthermore the hexane extracts and hydroalcoholic fractions from branches and stem barks showed moderate to weak activity against this yeast. All the samples had weak to moderate activity against C. parapsilosis and C. neoformans, except for the ethanol extract, ethyl acetate, and n-butanol fractions from stem barks, which exhibited potent inhibition of C. parapsilosis (MIC = 62.5 μg/mL).

Compounds 1-4 isolated from n-butanol fraction of branches from P. nitens inhibits the growth of opportunistic fungi with MIC values of 62.5 and 31.2 μg/mL against C. krusei and C. parapsilosis, respectively.

Additionally, minimal fungicidal concentration (MFC) of all extracts, fractions and guanidine alkaloids (1-4) were also evaluated against the four yeasts and showed MFC values higher than 1000 μg/mL, indicating a fungistatic behavior.

DISCUSSION

Several Fabaceae species have been evaluated for their antifungal properties (Scorzoni et al., 2007) among them Pterogyne nitens Tul., Fabaceae, a typical leguminous plant from Brazilian flora has been studied for antimicrobial activity. Previous biological studies have demonstrated that extracts from the barks of P. nitens did not show antibacterial activity (Salvat et al., 2001).

The bioactivity presented for compounds 1-4 indicated that antifungal activity observed in the extracts and fractions may be at least partially due to guanidine alkaloids. It was also observed that the strongest antifungal effects of the tested samples were on strains of C. krusei and C. parapsilosis when compared with C. albicans and C. neoformans.

P. nitens and isolated compounds displayed activity against C. krusei, which is very significant because this yeast has natural resistance against commercial drug fluconazole (Rex et al., 1995), suggesting its potential application for treating C. krusei infections, considering a possible mode of action different from those azole drugs.

The current study suggests that P. nitens have antimicrobial activity against opportunistic yeasts. Therefore, it could be an important source of antifungal compounds which can be useful for developing new lead compounds, including compound 1, which was described for the first time in the Fabaceae family. Further chemical and pharmacological investigations are thus needed in order to isolate and identify additional constituents and establish the potential mechanisms of action.

ACKNOWLEDGEMENTS

This work was funded by grants from the "Fundação de Amparo à Pesquisa do Estado de São Paulo", FAPESP (Brazil), as part of the Biota-FAPESP-The Biodiversity Virtual Institute Program (www.biota.org.br) through grants 03/021767-7 and 04/07932-7. LOR, MP, LS, MJSMG, TB, VSB also acknowledge CNPq and FAPESP for researcher and students fellowships.

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Publication Dates

• Publication in this collection
  03 Sept 2010
• Date of issue
  Nov 2010