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CFSE/PI双标法检测CIK细胞对顺铂预处理肿瘤细胞的杀伤活性
细胞因子诱导的杀伤细胞(cytokine-induced killer,CIK)是将人外周血单个核细胞在体外用多种细胞因子共同培养一段时间后获得的一群异质细胞,具有增殖速度快、杀瘤活性高、杀瘤谱广等优点.如何对CIK细胞的效应功能进行客观准确的评价,如何使CIK和化疗有机地结合在一起,对CIK的临床应用具有重要的意义.
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参臼胶囊诱导肝癌SMMC-7721细胞凋亡
目的:研究"参臼胶囊"(SJ)诱导人肝癌SMMC-7721细胞凋亡的作用.方法:采用HE染色、透射电镜观察、原位末端标记技术(TUNEL)等方法,观察SJ作用于SMMC-7721细胞后细胞形态的改变.结果:HE染色及透射电镜分别从微观、超微观水平观测肿瘤细胞经SJ作用后的形态学变化:细胞变圆、缩小,折光性增强,细胞破碎,经HE染色后,细胞核呈兰黑色,胞质呈淡红色,细胞出现凋亡改变,单个散在分布,表现为核染色质致密浓缩,核碎裂或核染色质断裂,形成大小不等的凋亡小体,证实10 μg/mL SJ作用SMMC-7721 48 h后细胞出现典型的凋亡征象;TUNEL法检测到发生在各期的凋亡细胞.结论:SJ可诱导SMMC-7721细胞凋亡,可望作为一种新的细胞凋亡诱导剂用于肝癌的治疗.
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咖啡酸苯乙酯对大肠癌HCT116细胞增生的抑制作用
目的:探讨咖啡酸苯乙酯(caffeic acid phenethyl ester,CAPE)对体外培养的大肠癌细胞HCT116细胞增生、细胞周期和凋亡的影响.方法:不同浓度CAPE处理体外培养的HCT116细胞后,采用MTT法检测处理后24、48、72、96 h HCT116细胞的增生活性;PI染色、流式细胞仪检测处理后24 h细胞周期分布;Annexin V-FITC/PI双染色、流式细胞仪检测处理后24h细胞凋亡率.结果:80,40,20,10,5.0,2.5 mg/L CAPE处理HCT116细胞24,48,72,96 h后,细胞增生明显受到抑制,呈时间和剂量依赖性特点.流式细胞仪细胞周期分析表明,10,5.0,2.5 mg/L CAPE处理HCT116细胞24 h后,G0/G1期细胞百分率上升,S期细胞百分率下降,呈剂量依赖性.流式细胞仪细胞凋亡率分析表明:10,5.0,2.5 mg/L CAPE处理HCT116细胞24 h后,细胞凋亡率上升,呈剂量依赖性.结论:CAPE对对HCT116细胞具有明显的增生抑制作用,其机制与其阻滞细胞周期和诱导凋亡有关.
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Objective: To screen novel genes related to adriamycin (Adr) resistance from human ovarian cancer resistance cell line OC3/Adr. Methods: Multidrug resistant ovarian cancer cell line OC3/Adr was induced by intermittent treatment of the human parent cell line OC3 with high concentration Adr. The difference of gene expression was screened by using different display analysis to the acquired Adr-resistance subline OC3/Adr and its parent cell line OC3. Results: OC3/Adr cell line was obtained which was more resistance to Adr than the parent cell line OC3 with the resistance index (RI) of 15.4. The OC3/Adr cell line also showed cross-resistance to other anti-cancer drugs (VP16, CDDP,5FU ). It grew slowly and exhibited changes of cell cycle. A number of differentially expressed ESTs (Expressed Sequence Tags, ESTs) were identified at mRNA level between the OC3/Adr and OC3. Four of 18 different ESTs were sequenced. The 431/432 base pair S1 was homologous to human sperm zona pellucida binding protein, while the other two ESTs, S3 and S4, were new gene segments, which were registered to GenBank with the number of AF 117656 and AF 126507 respectively. Particularly, the expression of S2 sequence increased in all the drug-resistance cell lines and S3 sequence overexpressed in human ovarian cancer tissues as compared with benign ovarian tumors. Adr in ovarian cancer OC3/Adr is involved with changes of multiple gene expressions.
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美国ASCO年会拾贝:组蛋白脱乙酰基酶抑制剂SNDX-275可能逆转乳腺癌细胞系对拉帕替尼或埃罗替尼耐药
在2009年的美国ASCO年会上,Witta等报道了题名为"Synergistic effect of SNDX-275 with lapatinib or erlotinib in breast, lung, or head and neck cancer cell lines expressing HER- 2"的研究.作者以两种表达HER-2(SK BR3、MCF-7)及一种不表达HER-2的乳腺癌细胞系(MDA-MB231)为实验对象,将细胞以不同浓度(0.16、1、6 μmol/L)的SNDX-275、拉帕替尼及埃罗替尼单药或联合培养5 d.
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抗VEGF抗体及抗flt抗体对人喉癌HEP-2细胞系的生长抑制作用
关键词: 抗体 人喉癌 细胞系 抑制作用 cancer cell line -
The Molecular Mechanisms of Nm23-H1 Gene Transfection on Reversing Invasion and Metastasis Phenotype in Human High-metastataic Large Cell Lung Cancer Cell Line L9981
Background: Our previous studies have proved that nm23-Hl gene was a tumor metastatic suppressive gene, tumor metastasis phenotype of human lung cancer could be reversed by transfection of nm23-H1 cDNA, but the molecular mechanism of nm23-H1 for inhibiting tumor invasion and metas-tasis is unclear. The aim of this study is to explore the molecular mechanism of nm23-Hl reversing the invasion and metastasis phenotype in human high-metastatic large cell lung cancer line L9981.
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Mitogenic and Anti-apoptotic Effects of Insulin in En-dometrial Cancer Cells Are Phosphatidylinositol 3-ki-nase/Akt Dependent
Background and objective Endometrial carcinoma is the most common gynecologic malignancy in the world. Although the insulin-resistant state or hyperinsulinemia was recently suggested as a potent risk factor for endometrial carcinogenesis and progression, there is only limited supporting evidence and the mechanism is unclear. In this study, we explored the roles of phosphatidylinositol 3-k/nase (PI3K)/Akt signaling pathway in the response of a human endometrial cancer cell line, Ishikawa3-H-12 cells, to insulin.Methods The Ishikawa 3-H-12 cells were serum-starved and then stimulated by insulin at various concentrations and for different time periods. To identify the insnlin-mediated signal pathway in the cells, LY294002, a selective inhibitor of PI3K, was used. The proliferation and the apoptotic rates were determined with methyl thiazolyl tetrazolium (MTT) and flow cytometric assays, respectively.Results The insulin receptor positive Ishikawa 3-H-12 cells had enhanced proliferation upon insulin stimulation in a rinse-and time-dependent manner. The growth promoting effect of insulin was blocked when the cells were pre-incubated with LY294002 for 60 rains.Insulin was able to protect the cells from serum-starvation-induced apoptosis in a concentration-dependent manner, while the anti-apoptotic effects of insulin was reversed by adding LY294002. Treatment with insulin at 1 μM for 15 rain resulted in an increased level of activated Akt The insulin-induced Akt activation was inhibited by LY294002 in a dose-dependent manner.Conclusion Insulin activates PI3K/Akt signaling pathway and is a mitogenic and anti-apoptotic agent for Ishikewa 3-H-12 endometrial cancer cells.