Seven new benzoyltyramines, atalantums A-G (1-7), and five known compounds were isolated from the peels of Atalantia monophylla. All compounds were examined for cytotoxicity against the cholangiocarcinoma cell lines KKU-M214, KKU-M213, and KKU-M156. Compound 5 exhibited the strongest cytotoxicity against KKU-M156 cells, with an IC value of 1.97 ± 0.73 μM, an approximately 4.7-fold higher activity than that of the ellipticine standard. Compound 1 displayed strong cytotoxicity against KKU-M214 cells, with an IC value of 3.06 ± 0.51 μM, nearly equal to that of the 5-fluorouracil standard. In the case of the KKU-M213 cell line, compounds 2, 4, and 11 exhibited stronger cytotoxicity than the ellipticine standard, with IC values of 2.36 ± 0.20, 5.63 ± 0.22, and 2.71 ± 0.23 μM, respectively. Compounds 1, 5, and 7 displayed cytotoxicity against KKU-M214 cells, with IC values of 3.06 ± 0.51, 8.44 ± 0.47, and 7.37 ± 1.29 μM, respectively.
Three new limonoids, limonophyllines A-C (1, 4 and 5), along with two known limonoids (2 and 3) and 11 acridone alkaloids (6-16) were isolated from the stems of Atalantia monophylla. All isolates were evaluated against cholangiocarcinoma, KKU-M156, and HepG2 cancer cell lines. Compounds 12, 14 and 16 displayed cytotoxicity against KKU-M156 cell line with IC ranging from 3.39 to 4.1 μg/mL while cytotoxicity against HepG2 cell line with IC ranging from 1.43 to 8.4 μg/mL. The structures of all isolated compounds were established by spectroscopic methods including 1D and 2D NMR, IR and mass spectrometry.
ABSTRACT:Derris indica, a Thai medicinal plant, contains biologically active substances such as flavone, flavanone, chalcone, and rotenoid compounds. Many compounds from this plant show antitumour, antihyperglycaemic, and anti-inflammatory activities. In this study, eleven compounds including six flavonoid and five chalcone compounds were isolated from the seed of D. indica. Their structures were established on the basis of NMR spectroscopic data. Desmethoxykanugin showed 100% inhibition to acetylcholinesterase, being about two fold stronger than the standard, tacrine, but cytotoxic against normal cells. Fortunately, pongaflavone and (2R,3R)-3-hydroxy-5-methoxy-2 ,2 -dimethylpyrano [7,8:5 ,6 ]-flavanone displayed around 50% inhibition to AChE as compared to the standard and they were inactive against normal cells. Thus these compounds could be developed to treat Alzheimer's disease. In addition, candidone, pongamol, obovatachalcone, derrischalcone, and tunicatachalcone showed cytotoxic activity against KB cell line with IC 50 values ranging from 8-18 µg/ml.
Four new benzoyltyramines, atalantums H-K (1-4) and seven known compounds were isolated from the peels of Atalantia monophylla. All compounds were tested for cytotoxicity against HeLa, HCT116 and MCF-7 cell lines, as well as normal cells (Vero cells). Compound 5 showed cytotoxicity against HeLa, HCT116 and MCF-7 cell lines with IC 50 values ranging from 16-25 g/mL but was inactive against Vero cells. Compound 6 also showed interesting results as compound 5 with IC 50 values ranging from 15-18 g/mL and an IC 50 value of 80.20 g/mL against Vero cells. This means compounds 5 and 6 can be used as lead compounds for anticancer agents.
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