Effect of triptolide on expression of Bax/
Bcl-2 and cleaved Caspase 3 in HCT116 cells.
Shijie Huaren Xiaohua Zazhi 2016;
24:3580-3586. [DOI:
10.11569/wcjd.v24.i24.3580]
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Abstract
AIM
To investigate the effect of triptolide (TP) on the expression of Bax/B cell lymphoma/leukmia-2 (Bcl-2) and cleaved Caspase 3 in HCT116 cells and the mechanism of TP induced apoptosis.
METHODS
HCT116 cells were divided into six groups and treated with 5, 10, 20, 30, 40, and 80 nmol/L TP, respectively. HCT116 cells treated with PBS were used control cells. After HCT116 cells were exposed to TP for 24 h, 48 h or 72 h, MTT assay was used for estimating the survival rates of HCT116 cells, flow cytometry (FCM) was applied to test the effects of TP on cell apoptosis, and Western blot was used for testing the expression of Bcl-2, Bax, Caspase 3, and activated Caspase 3.
RESULTS
TP could inhibit the proliferation of HCT116 cells. The survival rates of HCT116 cells decreased with the increase in the concentration and treatment time of TP. The survival rates were 4.25%, 13.6%, 34.4%, 43.8% and 44.5%, respectively, for cells exposed to 5, 10, 20, 30, and 40 nmol/L TP for 48h. The expression of Bcl-2 was decreased with the increase in the concentration of TP. Additionally, the level of Bax was decreased in the cytoplasm but increased in mitochondria, indicating that TP can promote Bax translocation from the cytoplasm to mitochondria. TP reduced the level of Caspase 3 in a concentration dependent manner; however, cleaved Caspase 3 level was increased.
CONCLUSION
TP can induce apoptosis of HCT116 cells by inhibiting the expression of Bcl-2, increasing the expression of Bax, and promoting the activation of Caspase 3.
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