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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Neolignans isolated from twigs of Nectandra leucantha Ness & Mart (Lauraceae) displayed in vitro antileishmanial activity

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Autor(es):
Grecco, Simone S. [1, 2] ; Costa-Silva, Thais A. [1] ; Sousa, Fernanda S. [3] ; Cargnelutti, Stefano B. [3] ; Umehara, Eric [1] ; Mendonca, Poliana S. [1] ; Tempone, Andre G. [4] ; Lago, Joao Henrique G. [1]
Número total de Autores: 8
Afiliação do(s) autor(es):
[1] Fed Univ ABC UFBC, Ctr Nat Sci & Humanities, Ave Estados 5001, BR-09210580 Santo Andre, SP - Brazil
[2] Anhanguera Univ Sao Paulo, Biotechnol & Innovat Hlth Postgrad Program, Sao Paulo, SP - Brazil
[3] Fed Univ Sao Paulo UNIFESP, Inst Environm Chem & Pharmaceut Sci, Diadema, SP - Brazil
[4] Adolfo Lutz Inst, Ctr Parasitol & Mycol, Sao Paulo, SP - Brazil
Número total de Afiliações: 4
Tipo de documento: Artigo Científico
Fonte: Journal of Venomous Animals and Toxins including Tropical Diseases; v. 24, SEP 27 2018.
Citações Web of Science: 0
Resumo

Background: The therapeutic arsenal for the treatment of Leishmaniasis is limited and includes toxic compounds (antimonials, amphotericin B, pentamidine and miltefosine). Given these aspects, the search for new compounds based on floristic biodiversity is crucial. In the present work, we report the isolation, characterization and antileishmanial activity of six related neolignans (1-6) of bioactive extract from Nectandra leucantha (Lauraceae) twigs. Methods: Dried and powdered twigs of N. leucantha were exhaustively extracted using n-hexane. The crude extract was dereplicated by HPLC/HRESIMS and subjected to column chromatography to yield pure compounds 1-6. Their chemical structures were identified via NMR and comparison of obtained data with those previously published in the literature. Biological assays of compounds 1-6 and their respective monomers (eugenol and methyleugenol) were performed using promastigote and amastigote forms of Leishmania (L) infantum. Results: Dereplication procedures followed by chemical characterization of isolated compounds by NMR enabled the identification of related neolignans 1-6. Neolignans 2, 4 and 6 showed potential against amastigote forms of L (L) infantum (EC50 values of 57.9, 67.7 and 13.7 mu M, respectively), while compounds 1 and 3 were inactive. As neolignans 2-4 are chemically related, it may be suggested that the presence of the methoxyl group at C4 constitutes an important structural aspect to increase antileishmanial potential against amastigote forms. Compound 6, which consists of a methylated derivative of compound 5 (inactive) showed antileishmanial activity similar to that of the standard drug miltefosine (EC50 = 16.9 mu M) but with reduced toxicity (SI = 14.6 and 72, respectively). Finally, two related monomers, eugenol and methyleugenol, were also tested and did not display activity, suggesting that the formation of dimeric compounds by oxidative coupling is crucial for antiparasitic activity of dimeric compounds 2, 4 and 6. Conclusion: This study highlights compound 6 against L. (L) infantum amastigotes as a scaffold for future design of new compounds for drug treatment of visceral leishmaniasis. (AU)

Processo FAPESP: 18/07885-1 - Biomoléculas oriundas de espécies vegetais de áreas remanescentes da Mata Atlântica e do Cerrado para tratamento de doenças tropicais negligenciadas - aspectos químicos e farmacológicos
Beneficiário:João Henrique Ghilardi Lago
Linha de fomento: Auxílio à Pesquisa - Programa BIOTA - Regular
Processo FAPESP: 15/23403-9 - Estudo pré-clínico racional de novos candidatos a fármacos em protozooses negligenciadas utilizando abordagens farmacocinéticas
Beneficiário:André Gustavo Tempone Cardoso
Linha de fomento: Auxílio à Pesquisa - Regular