Life Sci. 2003 Sep; 73(18): 2383-94.

Acetone extract of Bupleurum scorzonerifolium inhibits proliferation of A549 human lung cancer cells via inducing apoptosis and suppressing telomerase activity.

Cheng YL, Chang WL, Lee SC, Liu YG, Lin HC, Chen CJ, Yen CY, Yu DS, Lin SZ, Harn HJ.

Graduate Institution of Medical Science, and Department of Surgery, Tr-Service General Hospital, National Defense Medical Center, Taipei 114, Taiwan, ROC.

Bupleuri radix, a traditional Chinese herb, has been widely used to treat liver diseases such as hepatitis and cirrhosis. The acetone extract of Bupleurum scorzonerifolium (AE-BS) showed a dose-dependently antiproliferative effect on the proliferation of A549 human lung cancer cells. The IC(50) of AE-BS, i.e., the concentration required to inhibit proliferation of A549 cells, was 59 +/- 4.5 microg/ml on day 1. The IC(50) of AE-BS for WI38 human normal lung fibroblast cells, however, was significant higher than that for A549 cells (150 +/- 16 microg/ml, p< 0.01). After 72 hours of exposure, AE-BS (60 microg/ml) significantly reduced A549 cell proliferation to 33 +/- 3.2% of control. In TUNEL assay, A549 cells treated with AE-BS showed typical morphologic features of apoptosis, and the percentage of apoptotic cells was approximately 38 % on day 1. In the TRAP assay, AE-BS-treated cells demonstrated significantly lower telomerase activity on day 3. This result indicates that the AE-BS could suppress the proliferation of lung cancer cells via inhibition of telomerase activity and activation of apoptosis.