蟾蜍灵(bufalin)是我国传统中药蟾酥中蟾毒的主要成分之一, 研究其抑癌作用及机制具有重要意义.采用台盼蓝染色法、噻唑蓝还原法和光镜观察bu falin对人低分化胃腺癌细胞系MGc-803的生长抑制作用.结果显示, 0.01μmol/L及以上浓度bufalin对MGc-803细胞具有显著的抑制作用, IC50值约为0.1μmol/L.bufalin抑制MGc-803生长的机制是致使细胞核染色质凝缩、碎裂, DNA损伤, 胞浆RNA含量下降, 导致细胞死亡.

To study the cytotoxic activity of bufalin, one of the components of bufadienolides in the TCM “Chansu”, and its mechanism of act ion. Human gastric cancer cell line MGc-803 was used as target cells. Inhibition of t umor cell growth was assessed by trypan blue exclusion and thiazole blue absorba nce and light microscope examination. Result showed that bufalin at concentrati ons of 0.01 μ mol/L and above could remarkably inhibit the growth of MGc-803 t um or cell, with IC50 of about 0.1 μ mol/L. Further study showed that its mechanism of action involved necrotic changes of nuclear chromatin and fragmentati on of chromosomal DNA leading to cell death.