RESUMO
Two new clerodane diterpenoids (1 and 2) and the known compound caseanigrescen D (3) were isolated from the leaves of Casearia grewiifolia by bioassay-guided fractionation. Their structures were determined by analyses of MS and 2D NMR data. The absolute configurations of 1 and 3 were established by analysis of X-ray diffraction data. Compounds 1-3 were evaluated for their cytotoxicity against four cancer cell lines, KB (mouth epidermal carcinoma cells), HepG-2 (human liver hepatocellular carcinoma cells), LU-1 (human lung adenocarcinoma cells), and MCF-7 (human breast cancer cells). Caseagrewifolin B (2) had inhibitory activity against KB and HepG-2 cell lines with IC50 values of 6.2 to 7.0 µM, respectively. When tested against the normal cells (NIH/3T3), caseagrewifolin B (2) exhibited a significant selective inhibition against cancer cells in comparison with the normal cells. Caseanigrescen D (3) was cytotoxic against four cancer cell lines; however it had no selective inhibition compared with normal cells.
Assuntos
Antineoplásicos Fitogênicos/isolamento & purificação , Antineoplásicos Fitogênicos/farmacologia , Casearia/química , Diterpenos Clerodânicos/isolamento & purificação , Diterpenos Clerodânicos/farmacologia , Plantas Medicinais/química , Antineoplásicos Fitogênicos/química , Diterpenos Clerodânicos/química , Ensaios de Seleção de Medicamentos Antitumorais , Feminino , Células Hep G2 , Humanos , Células KB , Estrutura Molecular , Folhas de Planta/química , VietnãRESUMO
Three new triterpenoids, bonianic acids A (1) and B (2) and 3-O-acetyluncaric acid (3), were isolated from the leaves and twigs of Radermachera boniana, together with six known compounds, ursolic acid (4), oleanolic acid (5), 3-epi-oleanolic acid (6), 3α-O-acetyl-α-boswellic acid (7), ergosterol peroxide (8), and ß-sitostenone (9). Ergosterol peroxide (8) and bonianic acids A (1) and B (2) exhibited significant activity against Mycobacterium tuberculosis H37Rv strain.
