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Cytotoxic alkaloids from Boehmeria siamensis
Yinggang Luo1, Yan Liu, Dixiang Luo
1Chengdu Institute of Biology, the Chinese Academy of Sciences, Chengdu 610-041, P. R. China.
Planta Medica
|November 5, 2003
Abstract:
Two new phenanthroquinolizidine alkaloids, boehmeriasins A and B, were isolated from the aqueous ethanolic extract of Boehmeria siamensis Craib (Urticaceae) by bioassay-guided fractionation. Their structures were elucidated on the basis of spectral evidence. Boehmeriasin A possesses cytotoxic activity against 12 cell lines from 6 panels of cancer including lung cancer, colon cancer, breast cancer, prostate cancer, kidney cancer and leukemia with GI (50) between 0.2 and 100 ng/mL, whereas boehmeriasin B showed lower activity.