Absolute Configuration and Antileishmanial Activity of (–)-Cyclocolorenone Isolated from Duguetia lanceolata (Annonaceae)
Background: The fractionation of the n-hexane phase of the EtOH extract from the leaves of Duguetia lanceolata (Annonaceae) led to the identification of the sesquiterpene (–)-cyclocolorenone. Objectives: Chemical characterization, including determination of the absolute stereochemistry, and in vitro...
| Autores: | , , , , , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2022 |
| País: | Brasil |
| Institución: | Universidade Estadual Paulista (UNESP) |
| Repositorio: | Repositório Institucional da UNESP |
| Idioma: | inglés |
| OAI Identifier: | oai:repositorio.unesp.br:11449/240688 |
| Acceso en línea: | http://dx.doi.org/10.2174/1568026622666220707095718 http://hdl.handle.net/11449/240688 |
| Access Level: | acceso abierto |
| Palabra clave: | (–)-Cyclocolorenone Antileishmanial activity Cell membrane Duguetia lanceolata Macrophage cells VCD |
| Sumario: | Background: The fractionation of the n-hexane phase of the EtOH extract from the leaves of Duguetia lanceolata (Annonaceae) led to the identification of the sesquiterpene (–)-cyclocolorenone. Objectives: Chemical characterization, including determination of the absolute stereochemistry, and in vitro evaluation of antileishmanial activity of the sesquiterpene (–)-cyclocolorenone, isolated from D. lanceolata, were carried out. Methods: (–)-Cyclocolorenone was isolated from D. lanceolata leaves using different chromato-graphic steps and its structure was defined by analysis of NMR and ESI-HRMS data. Additionally, the absolute configuration of (–)-cyclocolorenone was ambiguously assigned by means of vibrational circular dichroism (VCD). Antileishmanial activity of (–)-cyclocolorenone was evaluated on promastigote and amastigote forms of Leishmania (Leishmania) amazonensis. The integrity of the cell membrane of L. (L.) amazonensis was analyzed using the SYTOX green probe. Results: (–)-(1R,6S,7R,10R)-Cyclocolorenone displayed activity against promastigotes and amastigotes forms of L. (L.) amazonensis with IC50 of 4.54 and 28.44 μM, respectively. Furthermore, this compound was non-toxic in J774 macrophage cells (CC50 > 458.71 μM) with a selectivity index > 100 (promastigotes) and > 32.2 (amastigotes). Additionally, (–)-cyclocolorenone was observed to target the parasite cell membrane. Conclusion: Obtained data suggested that (–)-cyclocolorenone, in which absolute configuration was determined, can be considered as a scaffold for the development of new drugs for the treatment of leishmaniasis. |
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