茶多酚对人肝癌BEL- 7404细胞端粒酶的抑制作用及诱导细胞凋亡的能力(英文)  

Inhibitory effects of tea polyphenols on telomerase and its ability to induce ap optosis of BEL-7404 human hepatocellular carcinoma cell *

作　　者：黎丹戎[1] 张玮[1] 唐东平[1] 张丽生[1] 

机构地区：[1]广西肿瘤防治研究所,南宁520021

出　　处：《中国药理学通报》2003年第8期934-939,共6页Chinese Pharmacological Bulletin

基　　金：国家自然科学研究基金资助课题 (No 3986 90 0 1);广西自然科学研究基金资助课题 (No 9912 0 38)

摘　　要：目的　探讨茶多酚诱导肝癌BEL 740 4细胞凋亡作用和在体外对端粒酶活性的影响。方法　MTT法和活细胞计数法测定茶多酚对人肝癌细胞的生长抑制作用 ,PCR ELISA试剂盒测定细胞的端粒酶活性。细胞形态学变化和DNA凝胶电泳观察细胞凋亡现象。结果　茶多酚体外对肝癌BEL 740 4细胞有明显的抑制作用 ,且这种抑制作用呈浓度和时间依赖性。采用浓度为 0 2和 0 1g·L- 1 的茶多酚作用 48h后的细胞出现DNA梯度条带和典型的凋亡形态学变化如核固缩、胞膜皱缩、胞核碎裂 ,凋亡小体形成等。茶多酚作用后 ,肝癌BEL 740 4细胞中端粒酶活性明显下降。结论　茶多酚在一定浓度下能诱导肝癌BEL 740 4细胞凋亡 ,其抗癌机制与抑制端粒酶活性有关。AIM To investigate the effects of Tea Po lyp henols on induction of apoptosis in human liver cancer cell etc. Telomerase acti vity of BEL-7404 cells was dramatically declined during the cell incuba tion with Tea Polyphenols. METHODS MTT colorimetric assay and trypan b lue exclusion method were used to examine the growth inhibition ofTea Polyphenols on BEL-7404 cells. Telomerase activity in cell was determined by PCR-ELISA method. Cell morphology and DNA gel electrophoresis were used to observe the apoptosis. RESULTS The solution of Tea Polyphenols showed dose-dependent and time-dependent inh ibitory effects on the proliferation on BEL-7404 cell line. After treatment wit h 0 2 and 0 1 g·L -1 tea polyphenols for 48 hours, cells displayed DNA ladder bands and typical morphological change of apoptosis included: ce ll shrinkage, membrane blebbing, chromatin condensation, nuclear fragmentation etc. Telomerase activit y of BEL-7404 cells was dramatically declined during the cell incubation with Tea Polyphenols. CONCLUSION Tea Polyphenols has growth inhibiti ng effect and may induce apoptosis in BEL-7404 in a certain dose range. The ant icancer mechanism of Tea Polyphenols might be related to the inhibition of telom erase activity.

关 键 词：茶多酚 肝癌 细胞 凋亡 端粒酶 

分 类 号：R282.71[医药卫生—中药学] R329.24[医药卫生—中医学]