Molecules 2012, 17(10), 12003-12014; doi:10.3390/molecules171012003

Synthesis and Antiplasmodial Activity of Betulinic Acid and Ursolic Acid Analogues

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Received: 17 September 2012; in revised form: 24 September 2012 / Accepted: 7 October 2012 / Published: 12 October 2012
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract: More than 40% of the World population is at risk of contracting malaria, which affects primarily poor populations in tropical and subtropical areas. Antimalarial pharmacotherapy has utilised plant-derived products such as quinine and artemisinin as well as their derivatives. However, worldwide use of these antimalarials has caused the spread of resistant parasites, resulting in increased malaria morbidity and mortality. Considering that the literature has demonstrated the antimalarial potential of triterpenes, specially betulinic acid (1) and ursolic acid (2), this study investigated the antimalarial activity against P. falciparum chloroquine-sensitive 3D7 strain of some new derivatives of 1 and 2 with modifications at C-3 and C-28. The antiplasmodial study employed flow cytometry and spectrofluorimetric analyses using YOYO-1, dihydroethidium and Fluo4/AM for staining. Among the six analogues obtained, compounds 1c and 2c showed excellent activity (IC50 = 220 and 175 nM, respectively) while 1a and b demonstrated good activity (IC50 = 4 and 5 μM, respectively). After cytotoxicity evaluation against HEK293T cells, 1a was not toxic, while 1c and 2c showed IC50 of 4 μM and a selectivity index (SI) value of 18 and 23, respectively. Moreover, compound 2c, which presents the best antiplasmodial activity, is involved in the calcium-regulated pathway(s).
Keywords: triterpenes; betulinic acid; ursolic acid; malaria; P. falciparum; cytotoxicity; calcium
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MDPI and ACS Style

Innocente, A.M.; Silva, G.N.S.; Cruz, L.N.; Moraes, M.S.; Nakabashi, M.; Sonnet, P.; Gosmann, G.; Garcia, C.R.S.; Gnoatto, S.C.B. Synthesis and Antiplasmodial Activity of Betulinic Acid and Ursolic Acid Analogues. Molecules 2012, 17, 12003-12014.

AMA Style

Innocente AM, Silva GNS, Cruz LN, Moraes MS, Nakabashi M, Sonnet P, Gosmann G, Garcia CRS, Gnoatto SCB. Synthesis and Antiplasmodial Activity of Betulinic Acid and Ursolic Acid Analogues. Molecules. 2012; 17(10):12003-12014.

Chicago/Turabian Style

Innocente, Adrine M.; Silva, Gloria N.S.; Cruz, Laura N.; Moraes, Miriam S.; Nakabashi, Myna; Sonnet, Pascal; Gosmann, Grace; Garcia, Célia R.S.; Gnoatto, Simone C.B. 2012. "Synthesis and Antiplasmodial Activity of Betulinic Acid and Ursolic Acid Analogues." Molecules 17, no. 10: 12003-12014.

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