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kokoona reflexa/kanker
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Further lupane lactones from Kokoona ochracea.
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Additional new lupane lactones were isolated from the stem bark of Kokoona ochracea (Celastraceae). Their structures have been elucidated, through the application of 1D and 2D nmr spectroscopic methods, as 20,29-dihydroxy-3-oxolupan-30,21 alpha-olide (ochraceolide D) [1] and
Catalytic inhibition of topoisomerase IIalpha by demethylzeylasterone, a 6-oxophenolic triterpenoid from Kokoona zeylanica.
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In a study to evaluate celastroloids as potential anticancer agents, demethylzeylasterone (5), a 6-oxophenolic triterpenoid from Kokoona zeylanica, was found to be an inhibitor of the enzyme topoisomerase IIalpha (IC(50) = 17.6 microM). Studies of the relationship of this inhibitor to both DNA and
Quinone-methide triterpenes and salaspermic acid from Kokoona ochracea.
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Tingenone[1],20-hydroxy-20-epi-tingenone[2],celastrol[ 3], and salaspermic acid [4] have been isolated from Kokoona ochracea stem bark. The quinone-methide triterpenes 1-3 exhibited strong but non-specific in vitro cytotoxicity against P-388 murine lymphocytic leukemia cells and a panel of human
New cytotoxic lupane lactones from Kokoona ochracea.
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Three new compounds, ochraceolides A, B, and C, were isolated from nonpolar extracts derived from Kokoona ochracea stem bark. Based on spectroscopic data, their structures were determined to be the closely related lupane lactones: 3-oxolup-20(29)-en-30,21 alpha-olide, 20,29-epoxy-3-oxolupan-30,21
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