%0 Journal Article
%T SFE-CO2 Extract from Typhonium giganteum Engl. Tubers, Induces Apoptosis in Human Hepatoma SMMC-7721 Cells Involvement of a ROS-Mediated Mitochondrial Pathway
%A Qingyong Li
%A Chunfei Jiang
%A Yuangang Zu
%A Zhen Song
%A Baoyou Zhang
%A Xiangdong Meng
%A Wei Qiu
%A Li Zhang
%J Molecules
%D 2011
%I MDPI AG
%R 10.3390/molecules16108228
%X Typhonium giganteum Engl. (BaiFuzi) is one of the herbs commonly used in traditional Chinese medicine against cancer. In our previous studies, 37 compounds were identified the SFE-CO2 (supercritical fluid extraction with CO2) extract by GC-MS, including the four major components [¦Â-sitosterol (40.22%), campesterol (18.45%), n-hexadecanoic acid (9.52%) and (Z,Z)-9,12-octadecadienoic acid (8.15%)]. The anti-cancer mechanisms of the SFE-CO2 extract from T. giganteum Engl. tubers have not been reported as yet. In this paper, the molecular mechanisms of the SFE-CO2 extract-mediated apoptosis in SMMC-7721 cells were further examined. SFE-CO2 extract inhibited the growth of SMMC-7721 cells in a time- and dose-dependent manner, arrested the cell cycle in the S phase and G2/M phase, and induced apoptosis. In addition, reactive oxygen species (ROS) increase, reduction of mitochondrial membrane potential, a rise in intracellular calcium levels were found in SMMC-7721 cells after treated with the extract. Western blot analysis showed that the extract caused down-regulation of Bcl-2 expression, and up-regulation of Bax expression. Moreover, caspase-3 and caspase-9 protease activity significantly increased in a dose-dependent manner. Collectively, our results showed that the SFE-CO2 extract from T. giganteum Engl. tubers induces apoptosis in SMMC-7721 cells involving a ROS-mediated mitochondrial signalling pathway.
%K Typhonium giganteum Engl.
%K SFE-CO2 extract
%K SMMC-7721
%K Apoptosis
%K ROS
%U http://www.mdpi.com/1420-3049/16/10/8228