Journal
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
Volume 19, Issue 6, Pages -Publisher
MDPI
DOI: 10.3390/ijms19061802
Keywords
piplartine; analogues; Schistosoma mansoni; cytotoxicity
Funding
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [2016/22488-3]
- CAPES/FAPEPI
- FAPESP [2014/02282-6, 2014/50316-7]
- CNPq [302674/2010-1]
- FCT (Fundacao para Ciencia e Tecnologia) [UID/MULTI/04378/2013 POCI/01/0145/FEDER/007728]
- Fundacao para a Ciencia e a Tecnologia (FCT) from FCT/MEC
- FEDER
- FCT [SFRH/BD/97995/2013]
- POPH-QREN-Tipologia 4.1-Formacao Avancada
- Fundo Social Europeu and Ministerio da Ciencia, Tecnologia e Ensino Superior
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Schistosomiasis, caused by helminth flatworms of the genus Schistosoma, is an infectious disease mainly associated with poverty that affects millions of people worldwide. Since treatment for this disease relies only on the use of praziquantel, there is an urgent need to identify new antischistosomal drugs. Piplartine is an amide alkaloid found in several Piper species (Piperaceae) that exhibits antischistosomal properties. The aim of this study was to evaluate the structure-function relationship between piplartine and its five synthetic analogues (19A, 1G, 1M, 14B and 6B) against Schistosoma mansoni adult worms, as well as its cytotoxicity to mammalian cells using murine fibroblast (NIH-3T3) and BALB/cN macrophage (J774A.1) cell lines. In addition, density functional theory calculations and in silico analysis were used to predict physicochemical and toxicity parameters. Bioassays revealed that piplartine is active against S. mansoni at low concentrations (5-10 mu M), but its analogues did not. In contrast, based on 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) and flow cytometry assays, piplartine exhibited toxicity in mammalian cells at 785 mu M, while its analogues 19A and 6B did not reduce cell viability at the same concentrations. This study demonstrated that piplartine analogues showed less activity against S. mansoni but presented lower toxicity than piplartine.
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