Study of inhibit the proliferation and induce apoptosis of human colonadenocarcinoma cell line HCT

AIM To explore the anti-tumor effect of indomethacin (IN) on human colon adenocarcinoma cells anddetermine the influence of indomethacin on cancer cell proliferation and apoptosis and elucidate the anti-tumor mechanism of Indomethacin.METHODS Human colon adenocarcinoma HCT116 cell line were cultured separately in vitro. Indomethacin(final concentration 100 μm - 800 gm) was administered alone or altogether with 5-Fu (50 μm). Agarose gelelectrophoresis, MTT, and Flow cytometry were used to study cell proliferation and apoptosis in humancolon carcinoma cell RT-PCR, western blot were used to detect the expression level of Bcl-2, bax gene andcdk4 protein expression in HCT116 cell lines after treated with IN for 24 hours.RESULTS Indomethacin can inhibit significantly the proliferation of HCT116 cell, change the morphology,and cause the cells to accumulate in the G0/Gl phase of the cell cycle, and induce apoptosis. The apoptosis oftumor cells was confirmed by DNA ladder formation on gel electrophoresis and sub-Gl peak on flowcytometry. These responses were time-and concentration-dependent. A synergic effect of inhibiting cancercell proliferation was observed when combined with Indomethacin and 5-Fu. RT-PCR results showed that INdown-regulated Bcl-2 mRNA expression, and did not change Bax mRNA expression. Western blot resultsconfirmed that IN inhibited Bcl-2 protein expression. No influence was found in the translation of Baxprotein. In inhibited cdk4 protein expression.CONCLUSION Our study results indicate that IN induce apoptosis of HCT116 cell by down-regulating Bcl-2expression and inhibiting cdk4 protein expression partially. This explains the mechanisms of antitumoractivity of the Indomethacin.     

Effects of Pinus massoniana bark extract on cell proliferation and apoptosis of human hepatoma BEL-7402 cells

AIM:To study the effects of Pinus massoniana bark extract (PMBE) on cell proliferation and apoptosis of human hepatoma BEL-7402 cells and to elucidate its molecular mechanism. METHODS:BEL-7402 cells were incubated with various concentrations (20-200 ug/mL) of PMBE for different periods of time. After 48 h, cell proliferation was determined by 3-(4,5-dimethyl-thiazolyl-2)-2,5-diphenyl tetrazolium bromide (MTT) assay. Apoptosis was evaluated by morphological observation, agarose gel electrophoresis, and flow cytometry analysis. Possible molecular mechanisms were primarily explored through immunohistochemical staining. RESULTS:PMBE (20-200 ug/mL) significantly suppressed BEL-7402 cell proliferation in a time-and dose-dependent manner. After treatment of BEL-7402 cells with 160 ug/mL PMBE for 24, 48, or 72 h, a typical apoptotic "DNA ladder"was observed using agarose gel electrophoresis. Nuclear condensation and boundary aggregation or split, apoptotic bodies were seen by fluorescence and electron microscopy. Sub-G_1 curves were displayed by flow cytometry analysis. PMBE decreased the expression levels of Bcl-2 protein in a time-dependent manner after treatment of cells with 160 ug/mL PMBE. CONCLUSION:PMBE suppresses proliferation of BEL-7402 cells in a time-and dose-dependent manner and induces cell apoptosis by possibly downregulating the expression of the bcl-2 gene.     

5-氟脲嘧啶诱导人胆囊癌细胞凋亡的研究

为研究 5 -氟脲嘧啶 (5 - FU)对胆囊癌细胞凋亡的影响 ,在体外培养的胆囊癌细胞中加入不同浓度的 5 -FU ,应用光镜、电镜、DNA凝胶电泳及流式细胞仪检测癌细胞凋亡的形态学特征、生化学特征、细胞凋亡百分率及细胞周期变化。在 5 - FU作用下 ,凋亡的胆囊癌细胞出现膜小泡、凋亡小体等特征性改变 ;DNA电泳呈现典型的“梯状”条带 ;流式细胞仪测定出现典型的凋亡峰 ;其凋亡百分率随着药物浓度的提高而明显升高 (与对照组比较 ,P<0 .0 5 )。认为 5 - FU可诱导胆囊癌细胞发生凋亡 ,其凋亡率随药物浓度的提高而升高     

Effect of caffeic acid phenethyl ester on proliferation and apoptosis of colorectal cancer cells in vitro

ABM: To study the effect of caffeic add phenethyl ester (CAPE) on proliferation, cell cycle, apoptosis and expression of β-catenin in cultured human colorectal cancer (CRC) cell line HCT116. METHODS: HCT116 cells were treated with CAPE at serial concentrations of 80,40,20,10,5,2.5 mg/L. The proliferative status of HCT116 cells was measured by using methaben-zthiazuron (MTT) assay. Cell cycle was analyzed by using flow cytometry (FCM) with propidium iodide (PI) labeling method. The rate of apoptosis was detected by using FCM with annexin V-FITC and PI double labeling method, β-catenin levels were determined by Western blotting, β-catenin localization in HCT116 was determined by indirect immunofluorescence. RESULTS: After HCT116 cells were exposed to CAPE (80, 40, 20, 10, 5, and 2.5 mg/L) for 24, 48, 72, 96 h, CAPE displayed a strong growth inhibitory effect in a dose- and time-dependent manner against HCT116 cells. FCM analysis showed that the ratio of G0/G1 phase cells increased, S phase ratio decreased and apoptosis rate increased after HCT116 cells were exposed to CAPE (10, 5, and 2.5 mg/L) for 24 h. CAPE treatment was associated with decreased cytoplasmic β-catenin, nuclear p-catenin and a concurrent increase in β-catenin protein expression at cell-cell junctions. CONCLUSION: CAPE could inhibit HCT116 cell proliferation and induce cell cycle arrest and apoptosis. Decreased β-catenin protein expression may mediate the anti-proliferative effects of CAPE.     

羟基喜树碱对HSC-T6细胞增殖与凋亡的影响

目的 探讨羟基喜树碱(HCPT)对体外培养大鼠肝星状细胞(HSC)的增殖与凋亡的影响.方法 大鼠肝星状细胞(HSC-T6)和大鼠正常肝细胞(BRL-3A)分别在实验组(分别以含HCPT浓度为0.008、0.016、0.031、0.063、0.125,0.25、0.5、1、2、4、8、16、32mg/L的培养液培养)和对照组(单纯培养)体外培养24 h.用四甲基偶氮唑盐法检测细胞增殖情况,找出HCPT对HSC-T6细胞增殖抑制的最佳作用浓度;流式细胞仪检测细胞凋亡率;透射电子显微镜下观察细胞凋亡的形态学变化情况;琼脂糖凝胶电泳法检测DNA片段化.多个样本均数的比较采用单因素方差分析,两样本均数的比较采用t检验.结果 HCPT对HSC-T6细胞和BRL-3A细胞的增殖抑制率随着药物浓度的升高而逐渐升高;当HCPT浓度＞0.5mg/L时,对BRL-3A细胞的毒性作用显著增高(P值均<0.05);0.5 mg/L对HSC-T6细胞增殖抑制作用最大,为HCPT对HSC-T6细胞增殖的最佳抑制浓度.0.125、0.25、0.5 mg/L的HCPT作用HSC-T6细胞24h,流式细胞仪检测显示细胞凋亡率分别为13.46%±2.42%、26.25%±5.65%、47.05%±8.76%,与对照组(4.89%±1.80%)相比,差异有统计学意义(F=34.24,P<0.01).0.5mg/L的HCPT作用HSC-T6细胞24 h,透射电子显微镜下可见细胞体积缩小,核仁消失,染色质浓缩聚集成团块状,沿核膜排列等凋亡形态学改变;琼脂糖凝胶电泳可见明显的DNA梯度带形成.结论 HCPT在体外可以明显地抑制HSC-T6细胞的增殖、诱导HSC-T6细胞凋亡,作用强度呈剂量依赖性.     

In vitro effects of chitosan nanoparticles on proliferation of human gastric carcinoma cell line MGC803 cells

AIM: To investigate the effects of chitosan nanoparticles on proliferation of human gastric carcinoma cell line MGC803 in vitro and the possible mechanisms involved. METHODS: Chitosan nanoparticles were characterized by particle size, zeta potential, and morphology. After treatment with various concentrations of chitosan nanoparticles (25, 50, 75, 100 μg/mL) at various time intervals, cell proliferation, ultrastructural changes, DNA fragmentation, mitochondrial membrane potential (MMP), cell cycle phase distribution and apoptotic peaks of MGC803 cells were analyzed by MTT assay, electron microscopy, DNA agarose gel electrophoresis, and flow cytometry. RESULTS: Chitosan nanoparticles exhibited a small particle size as 65 nm and a high surface charge as 52 mV. Chitosan nanoparticles markedly inhibited cell proliferation of MGC803 cells with an IC50, value of 5.3 μ/mL 48 h after treatment. After treatment with chitosan nanoparticles, the typical necrotic cell morphology was observed by electron microscopy, a typical DNA degradation associated with necrosis was determined by DNA agarose electrophoresis. Flow cytometry showed the loss of MMP and occurrence of apoptosis in chitosan nanoparticles-treated cells. CONCLUSION: Chitosan nanoparticles effectively inhibit the proliferation of human gastric carcinoma cell line MGC803 in vitro through multiple mechanisms, and may be a beneficial agent against human carcinoma.     

Growth inhibition and apoptosis induction of tanshinone Ⅱ-A on human hepatocellular carcinoma cells

AIM: To evaluate the effects of tanshinone II-A on inducing growth inhibition and apoptosis of human hepatocellular carcinoma (HCC) cells. METHODS: The human hepatocellular carcinoma cell line SMMC-7721 was used for the study. The cells were treated with tanshinone II-A at different doses and different times. Cell growth and proliferation were measured by MTT assay, cell count and colony-forming assay. Apoptosis induction was detected by microscopy, DNA ladder electrophoresis and flow cytometry. RESULTS: In MTT assay, the inhibitory effect became gradually stronger with the passage of time, 24, 48, 72 and 96 h after treatment with tanshinone II-A, and the most significant effect was observed at 72 h. On the other hand, the increase of doses (0.125, 0.25, 0.5, 1.0 mg/L tanshinone II-A) resulted in enhanced inhibitory effect. The growth and proliferation of SMMC-7721 cells were obviously suppressed in a dose- and time-dependent manner. The results of cell count were similar to that of MTT assay. In colony-forming assay, the colony-forming rates were obviously inhibited by tanshinone II-A. In tanshinone II-A group, the morphology of cellular growth inhibition and characteristics of apoptosis such as chromatin condensation, crescent formation, margination and apoptotic body were observed under light and transmission electron microscopes. DNA ladder of cells was presented in electrophoresis. The apoptosis index (AI) was 16.9% (the control group was 4.6%) in flow cytometry. The cells were arrested in G(0)/G(1) phase, and the expressions of apoptosis-related genes bcl-2 and c-myc were down-regulated and fas, bax, p53 up-regulated. CONCLUSION: Tanshinone II-A could inhibit the growth and proliferation of HCC cell effectively in vitro by apoptosis induction, which was associated with up-regulation of fas, p53, bax, expression and down-regulation of bcl-2 and c-myc.     

Growth inhibition and apoptosis induction of tanshinone Ⅱ-A on human hepatocellular carcinoma cells

AIM: To evaluate the effects of tanshinone Ⅱ-A on inducing growth inhibition and apoptosis of human hepatocellular carcinoma (HCC) cells.METHODS: The human hepatocellular carcinoma cell line SMMC-7721 was used for the study. The cells were treated with tanshinone Ⅱ-A at different doses and different times.Cell growth and proliferation were measured by MTT assay,cell count and colony-forming assay. Apoptosis induction was detected by microscopy, DNA ladder electrophoresis and flow cytometry.RESULTS: In MTT assay, the inhibitory effect became gradually stronger with the passage of time, 24, 48, 72and 96 h after treatment with tanshinone Ⅱ-A, and the mostsignificant effect was observed at 72 h. On the other hand, the increase of doses (0.125, 0.25, 0.5, 1.0 mg/L tanshinone Ⅱ-A) resulted in enhanced inhibitory effect.The growth and proliferation of SMMC-7721 cells were obviously suppressed in a dose- and time-dependent manner. The results of cell count were similar to that of MTT assay. In colony-forming assay, the colony-forming rates were obviously inhibited by tanshinone Ⅱ-A. In tanshinone Ⅱ-A group, the morphology of cellular growth inhibition and characteristics of apoptosis such as chromatin condensation, crescent formation, margination and apoptotic body were observed under light and transmission electron microscopes. DNA ladder of cells was presented in electrophoresis. The apoptosis index (AI) was 16.9% (the control group was 4.6%) in flow cytometry. The cells were arrested in G0/G1 phase, and the expressions of apoptosisrelated genes bcl-2 and c-myc were down-regulated and fas, bax, p53 up-regulated.CONCLUSION: Tanshinone Ⅱ-A could inhibit the growth and proliferation of HCC cell effectively in vitro by apoptosis induction,which was associated with up-regulation of fas, p53, bax,expression and down-regulation of bcl-2and c-myc.     

犀黄丸诱导Bel-7402细胞凋亡及其细胞内钙离子浓度的变化

研究犀黄丸(含药血清)诱导肝癌Bel—7402细胞凋亡的作用及凋亡过程中细胞内游离钙离子浓度的变化。DNA琼脂糖凝胶电泳法检测细胞凋亡，流式细胞仪检测凋亡过程中细胞内游离钙离子浓度的变化。DNA琼脂糖凝胶电泳法显示有明显的DNA梯带，同时在细胞凋亡过程中细胞内游离钙离子浓度明显升高，以凋亡早期较为明显。犀黄丸能诱导肝癌细胞凋亡，细胞内游离钙离子浓度升高可能是其机制之一。     

弓形虫诱导人白血病细胞K562凋亡的实验观察

目的 探讨弓形虫对体外培养的人白血病细胞K562（简称K562细胞）有无抑制作用和诱导细胞凋亡作用。方法 取培养至对数生长期的K562细胞（浓度为5×10^-4/ml和1×10^-6/ml）分别接种于96孔培养板（100 μl/孔）及50 ml培养瓶（1.5 ml/瓶）中，加入不同浓度的弓形虫速殖子（1×10⁴、2×10⁴、4×10⁴、8×10⁴及16×10⁴个/ml），作用48 h, 用四甲基氮噻唑蓝（MTT）法检测其对K562细胞增殖的抑制作用；荧光显微镜、琼脂糖凝胶电泳及流式细胞仪检测细胞凋亡。 结果 上述不同浓度弓形虫速殖子作用48 h，对K562细胞增殖的抑制率依次为17%、28%、48%、50%及55%。各实验组吸光度（A₄₉₀）与对照组比较差异均有统计学意义（t=3.606及5.918， P<0.05； t=9.171、7.841、7.067， P<0.01）。荧光显微镜观察实验组培养的K562细胞，出现细胞核固缩及凋亡小体。琼脂糖凝胶电泳见DNA梯形条带。流式细胞仪检测到细胞凋亡峰（48 h），上述不同浓度弓形虫速殖子诱导K562细胞凋亡数分别占总数的5.53%、7.12%、10.34%、21.14% 及29.68%。对照组未出现凋亡小体。 结论 弓形虫速殖子对体外培养K562细胞增殖有明显的抑制作用，并可诱导K562细胞凋亡。     

乙醇诱导肝癌细胞凋亡的实验研究

目的 研究低浓度乙醇对肝癌细胞增殖的影响及作用机理。方法 采用MTT比色法观察乙醇对细胞增殖的影响；采用流式细胞仪法观察乙醇对肝癌细胞内活性氧的影响；采用琼脂凝胶电泳法观察DNA片段的梯形条带。结果 低浓度乙醇抑制了细胞的增殖；乙醇作用于细胞后，在2h内引起活性氧的产生；24h后细胞出现典型的凋亡表现。结论 乙醇能通过诱导细胞内活性氧的产生而引起细胞凋亡，呈明显的剂量依赖性。     

联合干扰素-α和吉非替尼对结肠癌细胞的生物学作用研究

目的 探讨干扰素(IFN)-α、吉非替尼对人结肠癌细胞系HCT116的增殖、凋亡作用.方法 采用结肠癌细胞HCT116为研究对象,观察不同浓度IFN-α(50 U/ml和100 U/ml)、吉非替尼(0.5 μmol/L,2.5 μmol/L和5.0 μmol/L)单独和联合应用(IFN-α 50 U/ml+吉非替尼0.5 μmol/L)和不同作用时间点(作用24、48和72 h)对细胞的生物学作用.四甲基偶氮唑盐(MTT)法检测药物对细胞的增殖抑制作用,光学显微镜观察细胞形态变化,流式细胞学检测细胞凋亡情况.采用SPSS 13.0软件进行统计学分析,两组间比较采用t检验,多组数据比较采用单因素方差分析.结果 IFN-α、吉非替尼单独和联合应用均能明显抑制HCT116的增殖(P值均 <0.05),且抑制程度与药物作用时间和药物浓度之间存在依赖效应.药物作用下可观察到细胞呈现凋亡形态学改变,流式细胞学结果显示HCT116细胞凋亡率明显增加,IFN-α(50 U/ml)、吉非替尼(0.5 μmol/L)单独和联合应用72 h后细胞凋亡率分别为15.6%±0.6%、13.6%±0.4%和31.2%±0.3%明显高于对照组的6.8%±0.3%,差异均有统计学意义(P值均<0.01).结论 IFN-α、吉非替尼均能抑制HCT116细胞生长并诱导细胞凋亡,两者联合应用具有协同增效作用.

Abstract：

Objective To investigate the effects of interferon-α (IFN-α) and gefitinib on the proliferation and apoptosis of human colon cancer cell line HCT116. Methods Colon cancer cell line HCT116 was selected as research objective. The biological effects of IFN-α and gefitinib alone or combined on the cells were observed at different time point (after worked for 24, 48 and 72 hours). The proliferation inhibition of the medicine on the HCT116 cells was measured by methyl thiazolyl tetrazolium (MTT) assay. Morphologic changes were observed under optical microscope. Apoptosis was measured by flow cytometry (FCM). The results were analyzed with SPSS 13.0 software, two groups compare was tested by t test, and single factor variance analysis was for multiple group data compare. Results IFN-α and gefitinib alone or combined could significantly inhibit the proliferation of HCT116 cells (P<0.05), and there was a time and dose-dependent manner between the degree of inhibition and the working time and concentration of the medicine. With the work of the medicine, apoptosis morphologic changes were observed in the cells. And FCM result indicated that the apoptosis rate significantly increased. After treated with IFN-α and gefitinib alone or combined for 72h, the cell apoptosis rate were 15.6%±0.6%, 13.6%±0.4% and 31.2%±0.3% respectively, which was obviously higher than control group (6.8%±0.3%, P<0.05). Conclusion Both IFN-α and gefitinib were able to inhibit the proliferation and induce apoptosis of HCT116 cells moreover, and a synergistic effect was observed while combine used there two medicines.     

硒蛋氨酸诱导食管癌细胞株凋亡的实验研究

目的：探讨硒蛋氨酸对食管癌细胞系EC 9706凋亡的影响。方法：采用MTT比色法，细胞生长曲线描绘观察硒蛋氨酸对食管癌细胞系EC 9706增殖的影响。采用流式细胞仪观察硒蛋氨酸对EC 9706细胞诱导其凋亡的作用及对细胞周期的影响。琼脂糖凝胶电泳法检测DNA ladder。结果：硒蛋氨酸呈时间、剂量依赖性方式抑制EC 9706细胞增殖，改变细胞周期分布，增加G0／G1期细胞比例，诱导细胞凋亡。结论：硒蛋氨酸可能通过影响细胞周期分布和诱导细胞凋亡，从而抑制EC 9706细胞增殖。硒蛋氨酸可能是预防和治疗食管癌的一种新制剂。     

至真方调控M2巨噬细胞来源外泌体逆转大肠癌细胞耐药的机制研究

目的:探讨至真方通过调控M2巨噬细胞来源的外泌体逆转大肠癌细胞耐药的机制.方法:采取差异超速离心法分别提取M2巨噬细胞来源的外泌体以及100 μg/mL至真方醇提物预处理的M2型巨噬细胞来源的外泌体;用透射电子显微镜观察外泌体的形态,Western blot鉴定外泌体的标志蛋白;通过共培养体系将HCT116细胞分为3组...     

三氧化二砷对正常肝细胞及肝癌细胞株的影响

目的观察不同浓度Ａｓ２Ｏ３作用不同时间对正常肝细胞及肝癌细胞株的影响。方法０．１２５～２μｍｏｌ／ＬＡｓ２Ｏ３与肝细胞及肝癌细胞株共孵育一定时间后,观察细胞的存活、形态学改变及细胞ＤＮＡ含量的分布。结果１μｍｏｌ／ＬＡｓ２Ｏ３处理的肝癌细胞第５天呈典型的凋亡特征性改变：在形态学上表现为细胞膜完整、染色质固缩、核碎裂、凋亡小体形成;流式细胞仪分析显示,在Ｇ１期细胞前出现亚二倍体峰,琼脂糖凝胶电泳呈凋亡特征性Ｌａｄｄｅｒ带;而正常肝细胞则未见明显改变。结论Ａｓ２Ｏ３可诱导肝癌细胞凋亡。     

错配修复基因MLH1激活p53和线粒体凋亡通路参与雌激素诱导的结肠癌细胞凋亡

临床和流行病学研究显示雌激素替代治疗可降低绝经后妇女的结直肠癌发生风险。前期研究发现雌激素能上调结肠癌细胞的错配修复(MMR)基因MLH1表达,在MLH1基因缺失的结肠癌细胞中再表达MLH1能明显增强雌激素诱导的细胞凋亡。目的:探讨MLH1参与雌激素诱导结肠癌细胞凋亡所涉及的信号通路以及p53及其相关基因在此凋亡通路中的作用。方法:以含人野生型MLH1(hMLH1)全长cDNA的质粒转染MLH1基因缺失的人结肠癌细胞株HCT116。以转染空质粒的HCT1 16细胞作为对照,在有或无雌激素作用的条件下,采用电泳法检测凋亡DNA Ladder,蛋白质印迹法检测p53等凋亡相关蛋白表达。结果:转染hMLH1后,10~(-8)mol/L雌二醇(E_2)能明显诱导HCT116细胞凋亡。转染hMLH1并经E_2处理的HCT116细胞(D组)与经E_2处理但未转染hMLH1的HCT116细胞(B组)相比,其caspase-3、caspase-9、p53、Bax、胞质细胞色素C蛋白表达均显著增强,D组上述蛋白表达亦均高于转染hMLH1但未经E_2处理的HCT116细胞(C组)。结论:MMR基因MLH1主要通过激活p53和线粒体凋亡通路参与雌激素诱导的人结肠癌细胞株HCT116凋亡。     

中药960诱导人肝癌细胞凋亡的研究

目的：观察９６０抗癌合剂对人肝癌细胞的凋亡作用,揭示其原发性肝癌作用机理。方法：丫啶橙（ＡＯ）染色,琼脂糖凝胶电经丙锭染色细胞周期分析（ＰＩ－ＦＣＭ）和末端转移酶ＤＮＡ断裂点原位标记（ＴＵＮＥＬＦＣＭ）。结果：经９６０药和血清处理后。细胞皱缩,深染,ＡＯ染色,细胞呈致密浓染的黄绿药荧光;ＤＮＡ电位见典型“梯形”带;ＤＮＡ直方图上见典型凋亡峰（０．９５％～２７．７％）,ＴＵＮＥＬ标记率６４．１２％～     

黑米花青素对结肠癌细胞增殖、细胞周期及凋亡的影响

目的探讨黑米花青素对结肠癌细胞增殖、细胞周期及凋亡的影响。 方法利用MTT法和流式细胞分析技术分别观察不同浓度同一时间和相同浓度不同时间,黑米花青素对结肠癌细胞(SW480)在细胞增殖、细胞周期分布和细胞凋亡的影响。 结果黑米花青素对结肠癌细胞的增殖、细胞周期分布和凋亡产生了影响,而且这种作用有浓度依赖性和时间依赖性。 结论黑米花青素可以抑制结肠细胞的增殖、阻滞细胞周期的进展、促进肿瘤细胞的凋亡。     

Induction of apoptosis of human gastric carcinoma SGC-7901 cell line by 5, 7-dihydroxy-8-nitrochrysin in vitro

AIM： To investigate the effect of 5, 7-dihydroxy-8- nitrochrysin （NOChR） on apoptosis of human gastric carcinoma SGC-7901 cell line.
METHODS： SGC-7901 cells were cultured in vitro and the inhibitory effect of NOChR on proliferation of SGC-7901 cells was measured by using an Ml-r assay. NOChR-induced apoptosis rate of SGC-7901 cells was detected using flow cytometry （FCM） with PI staining. DNA ladder bands were observed by DNA agarose gel electrophoresis. The influence of NOChR on the proxisome proliferator-activated receptor-γ （PPARγ）, Bcl-2 and Bax protein expression of SGC-7901 cells was analyzed by Western blot.
RESULTS： MIF assay showed that NOChR markedly inhibited proliferation of SGC-7901 cells in a dose- dependent manner, and when ICso was 4.14 μmol/L, the potency of NOChR was 10 times than that of lead compound, chrysin （ChR, IC50 was 40.56 μmol/L）, and was similar to 5-fluorouracil （5-FU, IC50 was 4.51 μmol/L）. FCM with propidium iodide （PI） staining demonstrated that the apoptosis rates of SGC-7901 cells treated with 1.25, 5.00 and 20.00 μmol/L NOChR for 48 h were 9.8% 4- 0.2%, 36.8% 4- 1.9% and 45.5% 4- 3.5%, respectively, and were significantly higher when treated with 5.00 and 20.00 μmol/L NOChR than that with 20.00 μmol/L ChR （12.9% 4- 1.5%）. DNA agarose gel electrophoresis showed that treatment of SGC-7901 cells with 20.00 μmol/L NOChR for 48 h resulted in typical DNA ladder bands of DNA of SGC-7901 cells, which could be eliminated by treating with 10.00 μmol/L GW9662, a blocker of PPARy. Western blot analysis revealed that after 24 h of treatment with 20.00 μmol/L NOChR, PPARgamma and Bax protein expression of SGC-7901 cells increased but Bcl-2 expression decreased; however, pre-incubation with 10.00 μmol/L GW9662 could efficiently antagonize and weaken the regulatory effect of 20.00 μmol/L NOChR on Bax and Bcl-2 protein expression of SGC-7901 cells.
CONCLUSION： NOChR induces apoptosis of SGO7901 cell lines by activating PPARy and decreasing ra