AIM To study the reversing effect of Chinese drug tanshinone on malignant phenotype of cancer cells.METHODS Human hepatocarcinoma cell line (SMMC-7721) was treated in vitro with 0.5mg/L tanshinone for 4 days, and vari...AIM To study the reversing effect of Chinese drug tanshinone on malignant phenotype of cancer cells.METHODS Human hepatocarcinoma cell line (SMMC-7721) was treated in vitro with 0.5mg/L tanshinone for 4 days, and variation in cell differentiation was detected.RESULTS The morphology of cancer cells was tended toward well differentiation and cell growth was markedly inhibited. BrdU uptake assay and immunohistochemical stain of PCNA showed that the BrdU labeling rate and PCNA positive rate were lower than the controls, but no difference was found statistically as compared with all transretinoic acid. Flow cytometric assay demonstrated that S phase cells decreased and G0/G1 phase cells increased. Expression of c-myc oncogene protein decreased but the c-fos oncogene protein markedly increased.CONCLUSION Tanshinone could reverse the inducing differentiation in human hepatocarcinoma cells (SMMC-7721). It may become a new prospective inducer of cell differentiation to treat cancers.展开更多
文摘目的:观察白花蛇舌草提取物对人前列腺癌DU145细胞增殖和凋亡的影响,并初步探讨其作用机制。方法:不同浓度(0.25 g·L-1、0.5 g·L-1、1 g·L-1)白花蛇舌草提取物作用人前列腺癌DU145细胞24 h、48 h、72 h后,使用CCK-8法检测白花蛇舌草提取物对DU145细胞增殖的影响;流式细胞术检测细胞凋亡的改变;实时定量PCR检测COX-2 m RNA和PCNA m RNA的表达;Western bloting法检测Bcl-2、Bax、Caspase3、Cyclin D1蛋白表达。结果:随着作用时间的延长和剂量的增加,白花蛇舌草提取物对DU145细胞增殖抑制率明显提高,呈时效和量效依赖效应。白花蛇舌草提取物作用48 h后,可明显提高细胞凋亡率,下调DU145细胞COX-2 m RNA、PCNA m RNA及Bcl-2、Cyclin D1蛋白表达,上调Bax、Caspase3蛋白表达,呈量效依赖效应。结论:白花蛇舌草提取物能降低人前列腺癌DU145细胞增殖能力,并诱导其凋亡,其机制可能与改变细胞周期和影响凋亡相关基因表达有关。
基金卫生部科研项目,Grant of China Medical Board of New York,INC。
文摘AIM To study the reversing effect of Chinese drug tanshinone on malignant phenotype of cancer cells.METHODS Human hepatocarcinoma cell line (SMMC-7721) was treated in vitro with 0.5mg/L tanshinone for 4 days, and variation in cell differentiation was detected.RESULTS The morphology of cancer cells was tended toward well differentiation and cell growth was markedly inhibited. BrdU uptake assay and immunohistochemical stain of PCNA showed that the BrdU labeling rate and PCNA positive rate were lower than the controls, but no difference was found statistically as compared with all transretinoic acid. Flow cytometric assay demonstrated that S phase cells decreased and G0/G1 phase cells increased. Expression of c-myc oncogene protein decreased but the c-fos oncogene protein markedly increased.CONCLUSION Tanshinone could reverse the inducing differentiation in human hepatocarcinoma cells (SMMC-7721). It may become a new prospective inducer of cell differentiation to treat cancers.
