土槿乙酸对人黑素瘤细胞增殖抑制作用研究

Effect of pseudolaric acid B on proliferation of human LiBr cell line in vitro

目的 研究土槿乙酸 (PAB)对人黑素瘤细胞 (L i Br)生长的抑制效应 ,并探讨其作用机制。方法 用不同浓度的 PAB加入体外培养 L i Br细胞中 ,观察加药后细胞生长数量及其形态的变化 ;用 MTT法检测 PAB的细胞毒作用 ;用 Hoechest33342和 PI双荧光染色法检测细胞凋亡。用免疫细胞化学方法 ,观察 L i Br细胞基因表达的变化。结果 PAB明显抑制 L i Br细胞生长 ;IC50 值为 2 .5× 10 - 5mol/ L;其抑制率与药物浓度呈剂量依赖关系 ;凋亡细胞的比例与药物浓度及作用时间呈正相关。免疫细胞化学检测显示 p2 1WAF1 表达增强。结论 PAB能有效抑制L i Br细胞的增殖。

Object To study the inhibitory effects and mechanism of pseudolaric acid B (PAB) on the growth of LiBr cell line. Methods PAB in different concentrations was added into the medium in which LiBr cells were cultured. The changes of cell morphology were observed by phase contrast microscope. Cytotoxicity of PAB was detected by MTT. The number of apoptotic cell was calculated by double fluorescent staining. The level of p21 WAF1 protein was measured with immunocytochemistry. Results The growth of LiBr cell line was remarkably inhibited by PAB. The IC 50 values of PAB for LiBr cells was 2.5×10 -5 mol/L. The inhibitory rate and the apoptotic cell rate were related with the medicine concentration. The level of p21 WAF1 protein in LiBr cells treated with PAB was obviously increased. Conclusion PAB can effectively inhibit the proliferation of LiBr cell line.