Abstract
Piliostigma thonningii (Schumach.) Milne-Redhead. (Leguminosae) is used for various medicinal purposes in African countries. Phytochemical investigation of P. thonningii yielded two compounds newly isolated from natural sources, 2β-methoxyclovan-9α-ol (1), and methyl-ent-3β-hydroxylabd-8(17)-en-15-oate (2), along with 14 known compounds (3–16). Compounds 1 and 4 (alepterolic acid) showed potential selectivity towards Trypanosoma brucei brucei with IC50 7.89 and 3.42 μM, respectively. Compound 2 showed activity towards T. brucei and Leishmania donovani Amastigote with IC50 3.84 and 7.82 μM, respectively. The structure activity relationship (SAR) of the isolated metabolites suggested that hydroxylation at C-2 enhances the antiprotozoal activity towards T. brucei in sesquiterpenes 1 and 3. Similarly hydroxylation at C-3 in labdane diterpenes elevates the antiprotozoal activity towards T. brucei.
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Acknowledgements
The project was supported by Sheda Science and Technology Complex, Nigeria and National Center for Natural Product Research, University of Mississippi, USA. We acknowledge Award Number P20GM104932 from the National Institute of General Medical Sciences for bioassay results. The authors wish to thank Dr. Charles L. Cantrell and Amber C. Reichley, USDA-ARS-NPURU for HR MS results.
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Afolayan, M., Srivedavyasasri, R., Asekun, O.T. et al. Phytochemical study of Piliostigma thonningii, a medicinal plant grown in Nigeria. Med Chem Res 27, 2325–2330 (2018). https://doi.org/10.1007/s00044-018-2238-1
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DOI: https://doi.org/10.1007/s00044-018-2238-1