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[PMID]: | 28336470 |
[Au] Autor: | Ebiloma GU; Igoli JO; Katsoulis E; Donachie AM; Eze A; Gray AI; de Koning HP |
[Ad] Endereço: | Institute of Infection, Immunity and Inflammation, University of Glasgow, United Kingdom; Department of Biochemistry, Faculty of Natural Sciences, Kogi State University, Nigeria. |
[Ti] Título: | Bioassay-guided isolation of active principles from Nigerian medicinal plants identifies new trypanocides with low toxicity and no cross-resistance to diamidines and arsenicals. |
[So] Source: | J Ethnopharmacol;202:256-264, 2017 Apr 18. | [Is] ISSN: | 1872-7573 |
[Cp] País de publicação: | Ireland |
[La] Idioma: | eng |
[Ab] Resumo: | ETHNOPHARMACOLOGICAL RELEVANCE: Leaves from the plant species studied herein are traditionally used in northern Nigeria against various protozoan infections. However, none of these herbal preparations have been standardized, nor have their toxicity to mammalian cells been investigated. In search of improved and non-toxic active antiprotozoal principles that are not cross-resistant with current anti-parasitics, we here report the results of the in vitro screening of extracts from seven selected medicinal plant species (Centrosema pubescens, Moringa oleifera, Tridax procumbens, Polyalthia longifolia, Newbouldia laevis, Eucalyptus maculate, Jathropha tanjorensis), used traditionally to treat kinetoplastid infections in Nigeria, and the isolation of their bioactive principles. AIM OF THE STUDY: To investigate the efficacies of medicinal plant extracts, and of compounds isolated therefrom, against kinetoplastid parasites, assess cross-resistance to existing chemotherapy, and assay their toxicity against mammalian cells in vitro. MATERIAL AND METHODS: Plants were extracted with hexane, ethyl acetate and methanol. Active principles were isolated by bioassay-led fractionation, testing for trypanocidal activity, and identified using NMR and mass spectrometry. EC values for their activity against wild-type and multi-drug resistant Trypanosoma brucei were obtained using the viability indicator dye resazurin. RESULTS: Seven medicinal plants were evaluated for activity against selected kinetoplastid parasites. The result shows that crude extracts and isolated active compounds from Polyalthia longifolia and Eucalyptus maculata, in particular, display promising activity against drug-sensitive and multi-drug resistant Trypanosoma brucei. The EC value of a clerodane (16α-hydroxy-cleroda-3,13(14)-Z-dien-15,16-olide) isolated from Polyalthia longifolia was as low as 0.38µg/mL, while a triterpenoid (3ß,13ß-dihydroxy-urs-11-en-28-oic acid) isolated from Eucalyptus maculata displayed an EC of 1.58µg/mL. None of the isolated compounds displayed toxicity towards Human Embryonic Kidney cells at concentrations up to 400µg/mL. In addition, the isolated compounds were active against Leishmania mexicana, as well as against T. congolense. CONCLUSION: We have isolated a clerodane compound from Polyalthia longifolia that shows low toxicity, no cross-resistance with current treatments, and promising activity against both human-infective and veterinary Trypanosoma species. |
[Mh] Termos MeSH primário: |
Amidinas/farmacologia Arsenicais/farmacologia Bioensaio/métodos Tripanossomicidas/farmacologia Tripanossomicidas/toxicidade
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[Mh] Termos MeSH secundário: |
Linhagem Celular Diterpenos Clerodânicos/farmacologia Diterpenos Clerodânicos/toxicidade Resistência a Medicamentos Células HEK293 Seres Humanos Leishmania mexicana/efeitos dos fármacos Medicina Tradicional Africana Nigéria Folhas de Planta/química Trypanosoma brucei brucei/efeitos dos fármacos Trypanosoma congolense/efeitos dos fármacos
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[Pt] Tipo de publicação: | JOURNAL ARTICLE |
[Nm] Nome de substância:
| 0 (Amidines); 0 (Arsenicals); 0 (Diterpenes, Clerodane); 0 (Trypanocidal Agents) |
[Em] Mês de entrada: | 1708 |
[Cu] Atualização por classe: | 170824 |
[Lr] Data última revisão:
| 170824 |
[Sb] Subgrupo de revista: | IM |
[Da] Data de entrada para processamento: | 170325 |
[St] Status: | MEDLINE |
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