Abstract
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 chromatographic 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.
Keywords: Duguetia lanceolata, (–)-Cyclocolorenone, VCD, Antileishmanial activity, Cell membrane, Macrophage cells.
Graphical Abstract
[http://dx.doi.org/10.1016/S1099-4831(10)06803-3]
[http://dx.doi.org/10.2307/1222960]
[http://dx.doi.org/10.1021/np000436s] [PMID: 11374943]
[http://dx.doi.org/10.1021/np0600191] [PMID: 16933882]
[http://dx.doi.org/10.1016/S0031-9422(00)00227-2] [PMID: 11130666]
[http://dx.doi.org/10.3389/fphar.2017.00752] [PMID: 29104539]
[http://dx.doi.org/10.4067/S0717-97072021000105047]
[http://dx.doi.org/10.1021/np060285e] [PMID: 17315964]
[http://dx.doi.org/10.1016/j.fitote.2006.01.013] [PMID: 16563660]
[http://dx.doi.org/10.1590/S0074-02762005000700019] [PMID: 16419337]
[http://dx.doi.org/10.1016/j.actatropica.2004.08.009] [PMID: 15533296]
[http://dx.doi.org/10.3390/molecules170911056] [PMID: 22976469]
[http://dx.doi.org/10.1016/j.phymed.2003.10.007] [PMID: 15957374]
[http://dx.doi.org/10.21577/0103-5053.20200089]
[http://dx.doi.org/10.1155/2021/5596876]
[http://dx.doi.org/10.1016/j.bioorg.2018.10.059] [PMID: 30399466]
[http://dx.doi.org/10.3389/fphar.2021.734127] [PMID: 34803682]
[http://dx.doi.org/10.1155/2021/6671287]
[http://dx.doi.org/10.1016/0031-9422(92)80445-K]
[http://dx.doi.org/10.1016/j.jep.2016.06.006] [PMID: 27282666]
[http://dx.doi.org/10.1039/jr9580003710]
[http://dx.doi.org/10.1021/jf00006a036]
[http://dx.doi.org/10.21577/0103-5053.20210079]
[http://dx.doi.org/10.1039/C5NP00027K] [PMID: 26140548]
[http://dx.doi.org/10.1039/D0NP00025F] [PMID: 32608433]
[http://dx.doi.org/10.1021/np8000927] [PMID: 18500843]
[http://dx.doi.org/10.1016/S0960-894X(01)00781-8] [PMID: 11814823]
[http://dx.doi.org/10.1016/S0031-9422(02)00542-3] [PMID: 12620357]
[http://dx.doi.org/10.1016/0031-9422(96)00105-7]
[http://dx.doi.org/10.1039/b100455g] [PMID: 11820764]
[http://dx.doi.org/10.2174/092986706778201611] [PMID: 17017912]
[http://dx.doi.org/10.1128/IAI.66.11.5337-5343.1998] [PMID: 9784541]
[http://dx.doi.org/10.1590/S0074-02761999000600015] [PMID: 10585657]
[http://dx.doi.org/10.1016/0378-8741(94)90020-5] [PMID: 8046941]