半枝莲含药血清对肝癌H22细胞凋亡及线粒体膜电位的影响

目的：探讨中药半枝莲提取物（Scutellaria Barbata extract,ESB）含药血清对肝癌H22细胞凋亡率及线粒体膜电位的影响。方法：体外培养小鼠H22肝癌细胞,以ESB高、中、低剂量含药血清培养液作用于H22细胞,并设立空白血清及5-氟尿嘧啶（fluorouracil,5-Fu）组（阳性对照组）。应用四甲基偶氮唑盐法检测药物对细胞增殖的抑制作用;透射电镜下观察肿瘤细胞的超微结构变化;碘化丙啶标记,流式细胞术检测肿瘤细胞周期及细胞凋亡情况;采用荧光探针罗丹明123负载,激光扫描共聚焦显微镜下观察H22细胞的荧光强度,分析H22细胞线粒体膜电位的大小。结果：ESB含药血清有一定的抑制H22细胞增殖的作用,高、中剂量组96 h抑制率分别为（47.5±6.4）%和（36.3±4.5）%。透射电镜下可见部分细胞呈典型凋亡形态学改变。流式细胞仪检测结果显示,ESB中、高剂量组有明显的诱导凋亡作用,其凋亡率分别为（3.15±1.12）%和（7.83±2.25）%,与空白组相比差异有统计学意义（P〈0.01）。空白对照组、5-Fu组和ESB低、中、高剂量,H22细胞线粒体膜电位分别为（245.45±67.37）、（127.42±41.35）和（213.68±65.52）、（186.34±56.37）、（142.65±39.44）,各组线粒体膜电位与细胞凋亡率呈负相关（r=-0.826,P〈0.01）。结论：ESB含药血清可有效诱导肿瘤细胞凋亡,其机制可能与降低肿瘤细胞线粒体膜电位有关。

Effects of Scutellaria Barbata drug-containing serum on apoptosis and mitochondrial transmembrane potential of hepatoma H22 cells

OBJECTIVE: To investigate the effects of serum containing Scutellaria Barbata extract (ESB) on apoptosis rate and mitochondrial transmembrane potential (MTP) of liver cancer cell line H22 from mice in vitro. METHODS: H22 cells were cultured in vitro and divided into 5 groups: blank control group, low-dose ESB group, medium-dose ESB group, high-dose ESB group and fluorouracil (5-Fu) group. Methyl thiazolyl tetrazolium assay was utilized to determine the proliferation rates of H22 cells. Cellular morphology was observed under a transmission electron microscope (EM). The rhodamine 123 was used as a fluorescence probe to label the H22 cells, and the fluorescence intensities were observed with a laser scanning confocal microscope. The fluorescence intensity of H22 cells indicated the MTP of H22 cells. RESULTS: The inhibition of serum containing ESB on the proliferation of H22 cells in vitro was observed in a time-dependent manner. The typical morphological changes of apoptosis were observed after incubation with ESB-containing serum in high dose for 48h. The apoptosis rates of blank control group, 5-Fu group, low-dose ESB group, medium-dose ESB group and high-dose ESB group were (0.51+/-0.32)%, (11.26+/-2.97)%, (1.07+/-0.46)%, (3.15+/-1.12)%, (7.83+/-2.25)% respectively. ESB could reduce the MTP of H22 cells from mice as compared with the untreated group. The MTPs of the blank control group, 5-Fu group, and low-, medium- and high-dose ESB groups were (245.45+/-67.37), (127.42+/-41.35), (213.68+/-65.52), (186.34+/-56.37) and (142.65+/-39.44) respectively, which were negatively correlated with the apoptosis rates. CONCLUSION: ESB-containing serum effectively induces apoptosis, which may be related to the decrease of MTP in H22 cells.