Fig. 1

The effect of triptolide on cell proliferation and gene transcription in both A549 and HTB182 lung tumor cells. For cell growth study, cells were collected at 24, 48, and 72 h after the triptolide treatment. For gene transcription study, cells treated with triptolide (5 ng/ml for HTB182 and 10 ng/ml for A549 cells) for 20 h and total RNA isolated from the cells were analyzed by real time PCR assay