| Texto completo | |
| Autor(es): Mostrar menos - |
Morais, Thiago R.
;
Alves Conserva, Geanne A.
;
Varela, Marina T.
;
Costa-Silva, Thais A.
;
Thevenard, Fernanda
;
Ponci, Vitor
;
Fortuna, Ana
;
Falcao, Amilcar C.
;
Tempone, Andre G.
;
Fernandes, Joao Paulo S.
;
Lago, Joao Henrique G.
Número total de Autores: 11
|
| Tipo de documento: | Artigo Científico |
| Fonte: | SCIENTIFIC REPORTS; v. 10, n. 1, p. 14-pg., 2020-03-25. |
| Resumo | |
Neolignan licarin A (1) was isolated from leaves of Nectandra oppositifolia (Lauraceae) and displayed activity against trypomastigote forms of the etiologic agent of American trypanosomiasis, Trypanosoma cruzi. Aiming for the establishment of SAR, five different compounds (1a - 1e) were prepared and tested against T. cruzi. The 2-allyl derivative of licarin A (1d) exhibited higher activity against trypomastigotes of T. cruzi (IC50=5.0 mu M and SI=9.0), while its heterocyclic derivative 1e displayed IC50 of 10.5 mu M and reduced toxicity against NCTC cells (SI>19.0). However, these compounds presented limited oral bioavailability estimation (<85%, Papp <1.0x10(-6)cm/s) in parallel artificial membrane permeability assays (PAMPA) due to excessive lipophilicity. Based on these results, different simplified structures of licarin A were designed: vanillin (2), vanillyl alcohol (3), isoeugenol (4), and eugenol (5), as well as its corresponding methyl (a), acetyl (b), O-allyl (c), and C-allyl (d) analogues. Vanillin (2) and its acetyl derivative (2b) displayed expressive activity against intracellular amastigotes of T. cruzi with IC50 values of 5.5 and 5.6 mu M, respectively, and reduced toxicity against NCTC cells (CC50>200 mu M). In addition, these simplified analogues showed a better permeability profile (Papp>1.0x10(-6)cm/s) on PAMPA models, resulting in improved drug-likeness. Vanillyl alcohol acetyl derivative (3b) and isoeugenol methyl derivative (4a) displayed activity against the extracellular forms of T. cruzi (trypomastigotes) with IC50 values of 5.1 and 8.8 mu M respectively. Based on these results, compounds with higher selectivity index against extracellular forms of the parasite (1d, 1e, 3d, and 4a) were selected for a mechanism of action study. After a short incubation period (1h) all compounds increased the reactive oxygen species (ROS) levels of trypomastigotes, suggesting cellular oxidative stress. The ATP levels were increased after two hours of incubation, possibly involving a high energy expenditure of the parasite to control the homeostasis. Except for compound 4a, all compounds induced hyperpolarization of mitochondrial membrane potential, demonstrating a mitochondrial imbalance. Considering the unique mitochondria apparatus of T. cruzi and the lethal alterations induced by structurally based on licarin A, these compounds are interesting hits for future drug discovery studies in Chagas disease. (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 |
| Modalidade de apoio: | Auxílio à Pesquisa - Programa BIOTA - Regular |
| Processo FAPESP: | 16/20633-6 - Metabolitos bioativos de Nectandra oppositifolia Nees & Mart. (Lauraceae): caracterização molecular, avaliação do potencial antiparasitário in vitro e in vivo e determinação dos mecanismos de ação |
| Beneficiário: | Geanne Alexsandra Alves Conserva |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado |
| Processo FAPESP: | 16/25028-3 - Anti-histamínicos H3R/H4R como agentes pró-cognitivos: uma abordagem multialvo |
| Beneficiário: | João Paulo dos Santos Fernandes |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |
| Processo FAPESP: | 18/10279-6 - Seleção e Otimização de Novos Candidatos a Fármacos para Leishmaniose e Doença de Chagas |
| Beneficiário: | André Gustavo Tempone Cardoso |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |