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Anti-proliferative and pro-apoptotic effects of cinobufagin on human breast cancer MCF-7 cells and its molecular mechanism.
Natural Product Research 2018 Februrary
Cinobufagin (CBF) is an active ingredient isolated from Venenum Bufonis extracted and dried from the secretory glands of Bufo gargarizans Cantor. The purpose of the study was to investigate the effects and underlying mechanisms of CBF on human breast cancer MCF-7 cells in vitro. Our results showed that CBF exhibited obvious cytotoxicity on MCF-7 cells in a dose- and time-dependent manner, as indicated by CCK-8 assays. Also, Hoechst 33258 staining and flow cytometry assays showed that CBF strongly induced MCF-7 cell apoptosis and G1 phase arrest. In addition, further molecular mechanistic investigation demonstrated that cinobufagin significantly increased Bax expression, decreased Bcl-2 expression level and up-regulated the ratio of the pro-apoptosis/anti-apoptosis protein Bax/Bcl-2, which were demonstrated by RT-qPCR and western blot assays. Taken together, our data confirm that CBF inhibits growth and triggers apoptosis of MCF-7 cells by affecting the expression of Bax and Bcl-2 in vitro.
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