PRLs Promote Spreading, Adhesion, and Proliferation of Human SW480 and SW620 Cells

Recent studies suggest that PRL-3 is involved in the metastasis of colorectal cancer, but the mechanism concerning that has not been well defined. This article expresses PRL-1, PRL-2, and PRL-3 and the catalytically inactive mutant forms of those enzymes in SW620 and SW480 cells, two human cell lines derived from non-metastatic cancer and metastatic colorectal cancer, respectively. While the expression of the native forms of PRLs promotes the spreading, adhesion, and proliferation of these cells, the expression of their mutant forms inhibits the earlier-mentioned processes. These data thus provide a cellular mechanism for the role of PRL-3 in tumor metastasis and suggest that all the three PRLs have similar functions.

Construction of Recombinant Adenovirus Carrying GRIM19 and Its Effect on SW480 Cells

In order to examine the effect of GRIM19 on colon cancer cell SW480, the recombinant adenovirus carrying GRIM19 gene was constructed and transfected into SW480 cells. GRIM19 cDNA was amplified by PCR with the template pcxn2-GRIM19 and cloned into the shuttle plasmid pAdTrack-CMV. The plasmid pAdTrack-CMV-GRIM19 was linearized by PmeⅠ and homologously recombined with bone plasmid pAdEasy-1 in BJ5183, followed by identification by enzyme digestion. After transfection of linearized pAd-GRIM19 with PacⅠ into HEK293 cells, Ad-GRIM19 was obtained and amplified by 3 circles. SW480 cells were infected with Ad-GRIM19. The apoptosis rate was detected by flow cytometry. Agarose electrophoresis revealed the bands of recombinant plasmids identified by enzyme digestion were in the right range corresponding with expectation. Under the fluorescent microscopy, the package of Ad-GRIM19 in HEK293 cells and the expression of Ad-GRIM19 in SW480 cells were observed. The transfection of Ad-GRIM19 into SW480 cells increased the apoptosis rate of SW480 cells as compared with controls, It was concluded that Ad-GRIM19 was successfully constructed and the overexpression of GRIM19 in colon cancer cell lines could promote the apoptotic cell death.

Identification of proteins of human colorectal carcinoma cell line SW480 by two-dimensional electrophoresis and MALDI-TOF mass spectrometry

AIM： To conduct bhe proteomic analysis of human colorectal carcinoma cell line, SW480 by using two-dimensional electrophoresis （2-DE） and matrix-assisted laser desorption /ionization-time of flight mass spectrometry （MALDITOFMS）. METHODS： The total proteins of human colorectal carcinoma cell line, SW480 were separated with 2-DE by using immobilized pH gradient strips and visualized by staining with silver nitrate. The gel images were acquired by scanner and 2-DE analysis software, Image Master 2D Elite. Nineteen distinct protein spots were excised from gel randomly and digested in gel by TPCK-trypsin. Mass analysis of the byptic digest peptides mixture was performed by using MALDI-TOF MS. Peptide mass fingerprints （PMFs） obtained by the MALDI-TOF analysis were used to search NCBI, SWISS-PROT and MSDB databases by using Mascot software. RESULTS： PMF maps of all spots were obtained by MALDI-TOF MS and thirteen proteins were preliminarily identified. CONCLUSION： The methods of analysis and identification of protein spots of tumor cells in 2-DE gel with silver staining by MALDI-TOF MS derived PMF have been established. Protein expression profile of SW480 has been obtained. It is demonstrated that a combination of proteomics and cell culture is a useful approach to comprehend the process of colon carcinogenesis.

Growth Inhibition Effect of DL-Lysine Acetylalicylate on sw480 Colon Carcinoma Cells

Objective： To investigate the effect of DL-lysine acetylsalicylate on proliferation of colon carcinoma cells line sw480. Methods： After treatment of DL-lysine acetylsalicylate, the study was performed by observing sw480 colorectal cancer cells with phase contrast microscope, making growth curve, and examining the inhibition rate of sw480 cells with MTT assay. Results： The morphology of sw480 cells showed characteristics of apoptosis, the cell growth curve showed inhibited proliferation of sw480 cells when treated with DL-lysine acetylsalicylate （P〈0.05）. The rate of inhibition was upward when the drug concentration increased. Conclusion： DL-lysine acetylsalicylate for injection can inhibit the growth of sw480 colorectal cancer cells obviously in a dose dependent manner.

Pro-apoptotic Effects of OSNQ on Human Colon Cancer SW480 Cells

[Objectives] The aim was to elucidate the pro-apoptosis mechanism of naphthoquinone derivative 2-octyl sulfoxide-1,4-naphthoquinone(OSNQ) on human colon cancer SW480 cells.[Methods]The cytotoxic effect of OSNQ on colon cancer SW480 cells was detected by MTT colorimetry.The pro-apoptotic effect of OSNQ on human colon cancer SW480 cells was detected by Annexin V-FITC/PI double staining.The changes in expression of apoptosis-related proteins were detected by Western blot.[Results]The results of MTT assay showed that OSNQ had a significant cytotoxic effect on colon cancer SW480 cells.The results of Western blot showed that OSNQ induced the apoptosis in colon cancer SW480 cells through promoting the expression of pro-apoptotic caspase-3 and inhibiting the expression of apoptosis-inhibiting protein Bcl-2.[Conclusions] OSNQ has a significant cytotoxic effect on colon cancer SW480 cells,and it induces the apoptosis of colon cancer SW480 cells by AKT signaling pathway.

Inhibition effects of dexamethasone on matrix metalloproteinase in osteoarthritis cells

Objective:To investigate the inhibition effect of dexamethasone with different concentration gradients on the expression of MMP-1,-3,and-13 in a bone joint cell model of IL-1β-induced SW1353 cells.Methods:The SW1353 cells were placed in a culture medium containing 10^(1)-10^(8) nmol/L dexamethasone,and after 12 hours of culture,the appropriate intervention concentration range of dexamethasone was screened by the MTS for subsequent experiments.After SW1353 cells were induced with 10 ng/mL IL-1β,10^(1)-10^(7) nmol/L dexamethasone was given for intervention,and RT-PCR was used to detect the mRNA expression of MMP-1,-3,and-13.The protein was extracted after the intervention of 104 nmol/L dexamethasone,and western blot was used to detect the protein expression of MMP-1,-3,and-13.Results:MTS proliferation experiment results showed that 10^(1)-10^(7) nmol/L dexamethasone had no significant effect on SW1353 cell viability,while 10^(8) nmol/L dexamethasone had a significant inhibitory effect on SW1353(p<0.05).There was no obvious effect on cell viability after adding 10 ng/mL IL-1β.RT-PCR results indicated that the IL-1βgroup had a significant increase in the mRNA expression of MMP-1,-3,and-13 compared with the blank control group,and the difference was statistically significant(p<0.05).After intervention with 102-10^(7) nmol/L dexamethasone,MMP-1 mRNA expression decreased(p<0.05);after intervention with 103-10^(7) nmol/L dexamethasone,MMP-3 mRNA expression decreased(p<0.05);after intervention with 10-10^(7) nmol/L dexamethasone,the mRNA expression of MMP-13 decreased(p<0.05).The Western blot results showed that compared with the blank control group,the protein levels of MMP-1,-3,and-13 in the IL-1βgroup were significantly increased;the protein levels of MMP-1,-3,and-13 were significantly reduced after the intervention of 104 nmol/L dexamethasone.Conclusion:Dexamethasone can inhibit the expression of MMP1,MMP-3,and MMP-13 in the IL-1β-induced OA cell model at the mRNA and protein levels.

In vitro antitumor activity and targeted sites of two novel platinum-based(II) complexes on SW620 colon cancer cell line

Objective:The aim of our study was to evaluate the in vitro antitumor activity of two novel platinum-based(II) complexes(2.3-pyridinedicarboxylic acid dehydrate platinum and 2.3-pyrazinedicarboxylic acid dehydrate platinum),which were concurrently provided with hydrophilic carboxyl group and lipophilic pyrazinyl or pyridyl group,on SW620 colorectal cancer cell line and the impact of the two compounds on the cell cycle and apoptosis of the cells when compared with the oxaliplatin,desiring the new ligand combined with hydrophilic and lipophilic properties would facilitate the transportation and transmembrane of the drugs,showing a better antitumor activity.Methods:After SW620 cells were treated with different doses of the three platinum-based agents for 24,48 and 72 h,the cell proliferation inhibition rate was determined using methyl thiazolyl tetrazolium(MTT) assay;the morphology of cells were evaluated under inverted microscope;the changes in cell cycle were determined using flow cytometry;the percent apoptosis was measured using Annexin V/PI double staining and the micromorphology of the cells after drug exposure was evaluated using scanning electron microscopy.Results:The evaluation on the proliferation inhibition rate revealed that the three platinum-based agents inhibited the SW620 cells in a time-and dose-dependent manner and showed different strengths as pyridine > pyrazine > Oxa.Under optical microscope,the morphological changes such as cell shrinkage,round cells and dead cells were frequently observed after drug exposure.Cell cycle determination showed that all of the three agents could function to block the cells converting from phase S to phase G2M.Apoptosis evaluation revealed that the three agents promoted the apoptosis of SW620 cells in a time-and dose-dependent manner and showed different strengths as pyridine > pyrazine > Oxa.Typical early and late apoptotic morphological changes could be detected during electron microscopy.Conclusion:The two novel platinum-based(II) complexes showed a stronger antitumor effect on SW620 cells than oxaliplatin,with the targeted site at a certain phase of cell cycle and apoptosis.

Chinese Herb Formulae Inhibit the Proliferation of Human Colon Cancer SW480 Cells by Inducing Cell Apoptosis

Objective:This study aimed to reveal the antitumor effects of Chinese herbal formulae and the underlying mechanisms in treating colorectal cancer,with a focus on developing traditional Chinese medicine(TCM)as a supplement and alternative therapeutic method for cancers.Materials and Methods:Human colon cancer SW480 cells were treated with three Chinese herbal formulae,Bu Zhong Yi Qi Decoction,Fuzi Lizhong Decoction,and Pulsatilla Decoction at different concentrations(50–600μg/mL)for 24,36,and 48 h,respectively.Cell viability was determined using the resazurin reduction assay,and cell survival rate was evaluated using a colony formation assay.After treatment with different concentrations(50–600μg/mL)of these three formulae for 48 h,the effects of the Chinese herbal formulae on cell apoptosis were investigated using Hoechst/propidium iodide(PI)staining.The positive PI-stained cells were investigated using an EnSpire multilabel plate reader and the positive Hoechst-stained cells were observed under a fluorescence microscope for morphological changes.Results:Bu Zhong Yi Qi Decoction,Fuzi Lizhong Decoction,and Pulsatilla Decoction inhibited SW480 cell proliferation in a dose-and time-dependent manner and induced cell apoptosis.Conclusion:Chinese herbal formulae with a special prescription form of TCM with antitumor effects bring a new perspective in line with the principles of TCM in cancer treatment.

苦参碱诱导人结肠癌SW1116细胞凋亡及机制探讨

目的观察苦参碱(Ma)诱导结肠癌SW1116细胞凋亡的作用,并探讨其机制。方法采用不同浓度的Ma处理SW1116细胞48h,并设正常对照组,MTT法检测细胞增殖抑制率,流式细胞仪检测细胞凋亡率,半定量RT-PCR检测Fas和Bax mRNA表达水平。结果与正常对照组相比,不同浓度Ma处理的SW1116细胞抑制率、胞凋亡率显著升高(P均(0.01),Fas和Bax mRNA表达上调(P<0.05,P<0.01)。结论Ma可诱导SW1116细胞凋亡,其作用机制可能与上调Fas和Bax mRNA表达有关。

羟基喜树碱耐药结肠癌细胞株SW1116/HCPT肿瘤耐药相关基因的表达

目的分析结肠癌耐药株SW1116/HCPT(羟基喜树碱)肿瘤耐药相关基因的表达情况。方法对本所新近构建的结肠癌耐药株SW1116/HCPT的肿瘤药物耐受功能分类基因芯片的检测结果进行验证;以实时荧光定量-PCR法检测基因芯片中部分表达有改变的基因;以western blot法分析SW1116/HCPT耐药细胞株与原代细胞株间在p21和MRP2蛋白表达水平上的变化。结果p21WAF1/CIP1、MRP2(ABCC2)、BRCA2、CYP3A5等部分表达有改变基因的实时荧光定量-PCR鉴定结果与基因芯片结果基本一致;Western blot检测的p21WAF1/CIP1和MRP2(ABCC2)蛋白表达水平与其转录水平表达相吻合。结论基因芯片技术是一种大规模检测多种基因表达的有效方法,新建的结肠癌细胞耐药模型SW1116/HCPT中存在多类肿瘤耐药相关基因在转录水平和翻译水平的表达差异。

氧化苦参碱诱导结肠癌细胞株SW1116凋亡的实验研究

目的:探讨氧化苦参碱(OM)抗肿瘤的作用机制,为OM在抗结肠癌方面的应用提供理论依据。方法:采用流式细胞仪检测不同浓度的OM对结肠癌细胞凋亡率及其细胞周期分布的影响。结果:OM具有一定的诱导结肠癌细胞凋亡的作用,可使S期细胞数目减少,随着OM剂量的加大,结肠癌细胞凋亡率增高,与剂量呈正相关。随药物浓度及作用时间的变化,细胞周期分布呈现G1期细胞比例逐渐增高。结论:OM具有一定的抗结肠癌作用,其机制与抑制癌细胞的增殖及促进癌细胞的凋亡有关。

D-氨基葡萄糖衍生物诱导人结肠癌SW1116细胞凋亡的形态学变化

目的:研究D-葡萄糖衍生物2-(3-羧基-1-丙酰氨基)-2-脱氧-D-葡萄糖诱导人结肠癌细胞SW1116凋亡时,其形态学的变化.方法:选用不同浓度的2-(3-羧基-1-丙酰氨基)-2-脱氧-D-葡萄糖与人结肠癌细胞SW1116共同孵育不同时间后,采用倒置相差显微镜,荧光显微镜、透射电子显微镜观察人结肠癌细胞SW1116的形态结构变化.结果:经2-(3-羧基-1-丙酰氨基)-2-脱氧-D-葡萄糖的不同浓度作用24～96h后,观察发现:人结肠癌细胞SW1116出现体积缩小,荧光染色增强,胞核或胞质中可见致密浓染的颗粒状黄绿色荧光染色.细胞染色质固缩,积聚在核膜边缘呈新月状,内质网疏松并与胞膜融合形成空泡,并呈一定的浓度、时间依赖性.结论:2-(3-羧基-1-丙酰氨基)-2-脱氧-D-葡萄糖在体外具有诱导人结肠癌细胞SW1116凋亡的作用.

抗原负载的DC及CIK对结肠癌细胞SW1116杀伤活性的比较研究

目的探讨树突状细胞(dendritic cells,DCs)以及CIK(cytokine induced cells)细胞对结肠癌细胞SW1116的体外杀伤作用,为结肠癌的治疗提供新的治疗手段。方法用IL-4、GM-CSF、TNFα等细胞因子诱导培养DC细胞,并用抗原进行负载;用CD3Ab、IFNγ、IL-2、IL-1α等诱导培养CIK细胞,分别用抗原负载的DC、CIK细胞对人结肠癌细胞SW1116进行体外杀伤活性实验,比较两者对SW1116的杀伤效果。结果抗原负载的DC和CIK对SW1116均有较强的杀伤效果,分别达到64.10%和67.70%。结论抗原负载的DC及CIK对人结肠癌细胞SW1116在体外具有较强的杀伤作用。

莪术醇抑制人结肠癌SW1116细胞增殖及相关机制的研究

观察莪术醇对人结肠癌SW1116细胞生长及肿瘤细胞凋亡的影响,以探讨其可能的机制。用不同浓度的莪术醇处理SW1116细胞,MTT检测莪术醇对SW1116细胞生长增殖的抑制作用;流式细胞术(FCM)检测细胞凋亡率;比色法测定Caspase-3酶活性;Western blot法检测Bcl-2、Bcl-XL的蛋白表达。莪术醇能以时间、剂量依赖性的关系抑制人结肠癌SW1116细胞的增殖,并诱导凋亡;莪术醇与SW1116细胞作用48h和72h后Caspase-3酶活性显著增强;同时,莪术醇处理SW1116细胞后,Bcl-2和Bcl-XL蛋白表达下调。说明莪术醇可抑制人结肠癌SW1116的增殖,诱导其凋亡,机制可能与调节Caspase-3、Bcl-2/Bcl-XL表达水平有关。

β－胡萝卜素对人大肠癌细胞株SW1116增殖和核DNA含量的影响

不同剂量（１０－５ｍｏｌ／Ｌ、１０－６ｍｏｌ／Ｌ和１０－７ｍｏｌ／Ｌ）β－胡萝卜素对体外人大肠癌细胞株ＳＷ１１１６增殖显示明显的抑制作用，癌细胞核ＤＮＡ含量明显减少、分布改变。此作用不仅由于β－胡萝卜素的ＶｉｔＡ活性，也由于其自身活性，其作用机制可能表现为抗氧化、抑制癌基因表达、损伤核结构等。

丁酸钠对人大肠癌细胞株SW1116动力学影响和超微结构改变的初步研究

用丁酸钠处理人大肠癌细胞株ＳＷ１１１６，观察其对瘤细胞增殖动力学影响及超微结构的改变。经丁酸钠（２ｍｍｏｌ／Ｌ，４ｍｍｏｌ／Ｌ）处理后的细胞用流式细胞仪检测可见Ｇ０／Ｇ１期细胞百分比增加，增殖指数下降；将诱导后细胞种植裸鼠皮下，瘤块形成受到抑制；电镜观察诱导后细胞，超微结构呈良好分化改变。

Linomide对人大肠癌裸鼠肠壁原位移植SW1116肿瘤的抑制作用

目的 研究 L inomide对人大肠癌 SW1116裸鼠肠壁原位移植瘤的抑制及抗转移作用。方法 用肿瘤肠壁粘接原位接种新技术和脾切除的方法为肿瘤创造生长及转移的条件 ,经裸鼠体内筛选获得稳定模型 ,模型用于 L inom ide对 SW1116裸鼠肠壁原位移植瘤的抑制及抗转移作用的研究 ,设立丝裂霉素 (MMC)和不给药对照。结果 L inomide和 MMC对肠壁原位肿瘤的抑制率分别为 71.9%和 81.3% ,两种药物均抑制了肿瘤的转移 ,对照组的肿瘤肝转移率为 75 % (6 / 8)。结论 采用新的粘接接种技术和脾切除的方法 ,降低了受体的免疫力 ,不仅使模型稳定传代 ,而且还能产生自发转移 ,初步显示了此模型在研究转移机制及抗转移药物方面有一定的应用价值。

血管生成素-1对SW1116细胞的作用及其机制

目的探讨血管生成素-1(Angiopoietin-1,Ang-1)蛋白对无血清DMEM培养基培养的结肠癌细胞(SW 1116)存活率的影响及其与PI3-′k inase/Akt通路的关系。方法将不同浓度的Ang-1蛋白作用于SW 1116细胞,用MTT法检测细胞增殖,根据实验结果选定Ang-1蛋白的后续实验浓度,设计出SW 1116细胞增殖抑制模型,分别向该模型中加入Ang-1及LY294002,应用免疫印记法分析相关蛋白(Tie-2、PI3K、Akt)的变化。结果 Ang-1组与无血清DMEM培养基组比较,Tie-2、PI3K、Akt三种蛋白在SW 1116细胞中的表达均增强,但仅Tie-2的表达有显著差异(P<0.01),LY294002组三种蛋白的表达均减弱(P<0.01,P<0.05)。结论较低浓度(0.05 mg/L)的Ang-1蛋白在结肠癌细胞中即有抗凋亡作用,且随着浓度的增加抗凋亡作用逐渐加强,当高于0.2 mg/L时,作用逐渐减弱,其诱导凋亡的机制可能与Tie-2/PI3-′k inase/Akt调节的通路有关,应用该途径的抑制剂LY294002可抑制结肠癌细胞的生长,实现抗肿瘤作用。

白毛藤诱导人结肠癌SW1116细胞凋亡作用及其机制研究

目的:研究白毛藤诱导人结肠癌细胞凋亡的作用及其机制。方法:荧光显微镜观察不同浓度白毛藤诱导SW1116细胞凋亡的作用,RT-PCR检测Bcl-2、Fas基因表达量的变化。结果:白毛藤具有诱导SW1116细胞凋亡的作用,并且上调Fas基因、降低Bcl-2基因的表达。结论:白毛藤促进SW1116细胞凋亡,其机制可能与激活Fas基因、抑制Bcl-2基因表达有关。

帕瑞昔布对人结肠癌SW1116细胞裸鼠移植瘤生长的影响及安全性观察

目的观察帕瑞昔布对人结肠癌SW1116细胞裸鼠皮下移植瘤生长的抑制作用及安全性。方法建立人结肠癌SW1116细胞裸鼠皮下移植瘤模型。将24只BALB/C裸鼠随机分为对照组、帕瑞昔布组和5-Fu组。记录各组裸鼠的体重和瘤体积变化,用药30 d后取瘤及脾脏,计算脾脏指数、抑瘤率,检测血清ALT和BUN,并用透射电镜观察瘤组织的形态学变化。结果帕瑞昔布组未见明显的药物相关毒副反应。帕瑞昔布能抑制SW11 16细胞裸鼠皮下移植瘤的生长。在干预前18 d,帕瑞昔布组的肿瘤抑制率逐渐增加,但随着药物干预时间的延长,抑制率却逐渐降低。结论裸鼠体内短期应用帕瑞昔布（15~18 d）是安全的,并能抑制SW1116细胞皮下移植瘤的生长。