蜈蚣提取液体外抗肝癌Bel-7404细胞作用机制的研究

目的研究蜈蚣提取液（ECP）对肝癌Bel-7404细胞株的作用机制。方法采用不同浓度ECP作用于体外培养的肝癌细胞Bel-7404，流式细胞仪检测治疗组与对照组的细胞周期及其凋亡率；免疫组化法检测两组细胞内凋亡相关基因X染色体连锁凋亡抑制蛋白（XIAP）及Bax的表达情况。结果ECP在不同浓度下，Bel-7404细胞内G0／G1期所占的比例、细胞增殖指数（PI）和细胞凋亡率是不同的，且差异有统计学意义（P〈0．05）。在相同浓度组下，24h的细胞凋亡率明显低于48h的，差异有统计学意义（P〈0．01）；随ECP浓度加大，XIAP在Bel-7404细胞中表达逐步减少，Bax表达逐步增多。结论ECP作用Bel-7404细胞的G1／G0期，抑制其增殖。通过上调Bax和抑制XIAP的表达，诱导并促进肝癌细胞凋亡，其作用呈剂量和时间依赖效应。

Study the antitumor mechanisms of extract of centipede on HCC Bel-7404 cell line

Objective To investigate the cell cycle and mechanisms of HCC Bel-7404 cell line by treatment of extract of centipede ( ECP). Method Bel-7404 cell line was cultured in vitro. ECP was applied to the interference of the growth of Bel-7404 with different drug concentration. Cell cycles and apoptosis ratios of ECP group were detected by flow cytometry (FCM). To investigate the expression of apop-tosis related genes XIAP and Bax, we also detect HCC Bel-7404 cell line after 48 hours treated with ECP by immunohistochemical method. Result The results of FCM displayed that ECP in treatment group mainly retard cell cycle phase in G0/G1 after 48 hours. The ratios of G0/ G1 .proliferation index (PI) and apoptosis ratios were significantly different between treatment group and control group when the concentrations were different. It was also significantly different between treatment group and control group when the same concentration of ECP was used. It showed that XIAP gene expression decreased gradually while Bax gene expression increased with the increase of ECP concentration, and these were statistical significance in contrast to control group ( P <0.05). Conclusion ECP mainly retarded cell cycle phase of Bel-7404 in G0/G1, suppressed the proliferation, and could induce it to apoptosis. The inhibitory effect was time - concentration dependent. The mechanisms were due to promote Bax gene and inhibit XIAP gene expression in HCC Bel-7404 cell line.