Manniindole, an indole derivative from the roots of Anonidium mannii and combined antischistosomal and enzymatic activities

Abstract

A new alkaloid, manniindole 1, together with four known compounds: aristolactam AII 2, aristolactam BII 3, piperolactam D 4 and polycarpol 5 were isolated from the crude extract EtOH-H₂O (8:2) of the roots of Anonidium mannii by chromatographic separation. The structure elucidation was performed on the basis of a spectroscopic analysis (IR, HRESI MS, 1D and 2D NMR) as well as a comparison of their spectral data with those reported in the literature. For the first time, the crude extract and those isolated compounds were evaluated for their anti-schistosomal activity against Schistosoma mansoni and for cytotoxicity activity against Huh7 and A549 cells. Furthermore, they were also tested in vitro on the recent characterized Schistosoma mansoni NAD⁺ catabolizing enzyme (SmNACE) for their impact on this enzyme which is localized on the outer surface of the adult parasite. Compound 2 displayed quite good worm killing capability, while 4 showed significant inhibition of SmNACE.

Keywords:

• Anonidium mannii
• Annonaceae
• phytochemical and biological investigation
• indole alkaloid
• anti-schistosomal activity
• enzymatic activity (SmNACE)
• cytotoxicity

Acknowledgments

The authors are thankful to AUF for providing a fellowship to J L T M.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Ethic statement

The laboratory where the experiments were done has permission A66040 from «Ministère de l’Enseignement supérieur de la Recherche et de l’Innovation (France)» for animal experimentation. Experimenters possess the certificate for animal experimentation (authorization 007083, decree 87-848 and 2012201-0008). Housing, breeding and animal care followed the national and European ethical requirements.