Cogniauxia podolaena: bioassay-guided fractionation of defoliated stems, isolation of active compounds, antiplasmodial activity and cytotoxicity.
Identifieur interne : 001917 ( Main/Exploration ); précédent : 001916; suivant : 001918Cogniauxia podolaena: bioassay-guided fractionation of defoliated stems, isolation of active compounds, antiplasmodial activity and cytotoxicity.
Auteurs : Jean Théophile Banzouzi [France] ; Patrice Njomnang Soh ; Bernard Mbatchi ; Adrien Cavé ; Suzanne Ramos [France] ; Pascal Retailleau [France] ; Olga Rakotonandrasana [France] ; Antoine Berry ; Françoise Benoit-VicalSource :
- Planta Medica [ 0032-0943 ] ; 2008-10.
Abstract
COGNIAUXIA PODOLAENA Baill. (Cucurbitaceae) is traditionally used in Congo Brazzaville for the treatment of malaria. We assessed the antiplasmodial activity of the plant and isolated some of the compounds responsible for this activity. It was the first time that a chemical study of this plant has been undertaken. Three triterpenes were isolated: cucurbitacin B ( 1), cucurbitacin D ( 2) and 20-epibryonolic acid ( 3) and their structures were assigned from spectroscopic evidence and comparison with published data. The crystallographic structure of 3 was determined. All fractions and compounds obtained in this study were assayed for antiplasmodial activity (on FcM29, a chloroquine-resistant strain of P. FALCIPARUM) and cytotoxicity (on KB and Vero cell lines). The IC50 values of 1, 2 and 3 are 1.6, 4 and 2 microg/mL on FcM29. Both 1 and 2 have a high cytotoxicity whereas 3 shows a better selectivity index.
Url:
DOI: 10.1055/s-2008-1081341
Affiliations:
Links toward previous steps (curation, corpus...)
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Le document en format XML
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<front><div type="abstract" xml:lang="en"> <p>COGNIAUXIA PODOLAENA Baill. (Cucurbitaceae) is traditionally used in Congo Brazzaville for the treatment of malaria. We assessed the antiplasmodial activity of the plant and isolated some of the compounds responsible for this activity. It was the first time that a chemical study of this plant has been undertaken. Three triterpenes were isolated: cucurbitacin B ( 1), cucurbitacin D ( 2) and 20-epibryonolic acid ( 3) and their structures were assigned from spectroscopic evidence and comparison with published data. The crystallographic structure of 3 was determined. All fractions and compounds obtained in this study were assayed for antiplasmodial activity (on FcM29, a chloroquine-resistant strain of P. FALCIPARUM) and cytotoxicity (on KB and Vero cell lines). The IC50 values of 1, 2 and 3 are 1.6, 4 and 2 microg/mL on FcM29. Both 1 and 2 have a high cytotoxicity whereas 3 shows a better selectivity index.</p>
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