Inhibitory mechanisms of timosaponin AⅢ on proliferation and growth of human glioblastoma cells / 中国中药杂志

To explore the inhibitory effect of timosaponin AⅢ on the proliferation of human glioblastoma cell line U87MG and investigate its related mechanism. As compared with the model group, the tumor weight was significantly reduced in timosaponin AⅢ-treated group. Timosaponin AⅢinhibited the proliferation of U87MG cell line in a dose-dependent manner. It up-regulated the gene and protein expression levels of p21, meanwhile inhibited the protein expression levels of β-Catenin, Cyclin D1 and Bcl-2. It also inhibited the translocation of β-Catenin into nucleus, suppressed the phosphorylation expression of ERK, but increased the phosphorylation expression of p38 and JNK. Combined use of JNK inhibitor SP600125 and p38 inhibitor SB203580 could decrease p21 and increase β-Catenin protein expressions. Timosaponin AⅢ inhibited the proliferation of human glioblastoma cell line U87MG partly by intervening MAPK and Wnt/β-Catenin signal pathways.

Effects of four kinds of Chinese medicine monomer on growth of PANC-1 xenograft tumor and studying of molecular mechanism / 中国中药杂志

<p><b>OBJECTIVE</b>The antitumor effects of icarisid II, timosaponin A-III, neferine and salidroside were studied in PANC-1 xenograft tumor.</p><p><b>METHOD</b>To establish of the nude mice xenograft tumor model, PANC-1 cells were injected. When the tumor major diameter was reached 3-5 mm, the treatment was initiated. The mice were randomized into vehicle control and treatment groups of six animals per each. Chinese medicine monomer was injected intraperitoneally every day. In 23th day, mice were killed once a day, tumor tissue were isolated and weighed and divided into two parts. One part was fixed with formaldehyde for tissue section and immunohistochemistry, the another of tissue was frozen in liquid nitrogen then in - 80 degrees C refrigerator for gene and protein expression analysis.</p><p><b>RESULT</b>In PANC-1 tumor xenograft experiment, compared with model group, timosaponin A-III (1.0 mg x kg (-1)) exerted significant inhibitory effects on tumor growth. Timosaponin A-III suppressed mRNA expressions of VEGF (P < 0.05), reduced protein expressions of VEGF (P < 0.05), activated Caspase-3 protein. Icarisid II, neferine and salidroside had not an excelled antitumor effect.</p><p><b>CONCLUSION</b>Timosaponin A-III exerted an excelled antitumor effect. The antitumor mechanisms include anti-angiogenesis, apoptosis promotion.</p>