姜黄素联合MMC对胃癌MGC-803细胞的生长抑制及细胞周期的影响

目的比较姜黄素分别联合低浓度和中浓度丝裂霉素C(MMC)与高浓度MMC单用对胃癌MGC-803细胞的生长抑制及增殖周期的影响,为临床上应用姜黄素作为化疗药物MMC的增效剂治疗胃癌提供实验依据。方法将姜黄素与低浓度和高浓度MMC联合作用或高浓度MMC单独作用于体外培养的胃癌MGC-803细胞24h,采用MTT方法检测药物作用对MGC-803细胞的生长抑制效应;采用流式细胞技术检测药物作用对MGC-803细胞周期的影响。结果姜黄素联用低剂量MMC对MGC-803细胞的生长抑制作用与中剂量MMC单用时无显著差异(P0.05);姜黄素联用中剂量MMC对MGC-803细胞的抑制作用与高剂量MMC单用时无显著差异(P0.05),提示姜黄素能增强MMC的作用效果。此外,姜黄素单用、MMC单用将MGC-803细胞分别阻滞于G2/M期和S期,姜黄素与MMC联用将MGC-803细胞阻滞于G2/M和S期。结论姜黄素与MMC联用对胃癌细胞MGC-803具有明显的生长抑制作用,其可能的机制之一是姜黄素与MMC联用将MGC-803细胞阻滞于S和G2/M期。     

健脾消癥方对人胃癌细胞MGC803凋亡和细胞周期的影响

目的:观察健脾消癥方对胃癌细胞株MGC803增殖、凋亡和细胞周期的影响。方法:(1)采用MTT法观察不同浓度的健脾消癥方对胃癌细胞株MGC803增殖的抑制作用;(2)使用Annexin V/PI荧光双染法检测健脾消癥方诱导肿瘤细胞进入凋亡的比例;(3)应用流式细胞仪检测健脾消癥方对MGC803细胞周期的影响。结果:(1)健脾消癥方对MGC803细胞有较强的抑制增殖的作用,并呈一定的浓度依赖性。(2)健脾消癥方高、中、低浓度组对胃癌细胞株MGC803作用24h后,早期凋亡率分别为49.83%、55.29%、16.73%。健脾消癥方高、中、低浓度组对胃癌细胞株MGC803作用48h后,早期凋亡率分别为84.52%、55.58%、51.76%。(3)与阴性对照组相比,健脾消癥方各浓度组对胃癌细胞株MGC803作用48h后,可将细胞阻滞于G2-M期,健脾消癥方高浓度组在G0-G1期前出现较明显的亚二倍体峰。结论:(1)健脾消癥方可明显抑制胃癌细胞株MGC803的增殖作用。(2)健脾消癥方对人胃癌细胞株MGC803有明显的诱导凋亡及阻滞细胞周期在G2-M期的作用。     

TLR9抑制剂对胃癌细胞MGC803分泌IL-6的作用

目的:探讨免疫系统蛋白TLR9在胃癌细胞MGC803中的表达及其抑制剂氯喹(chloroquine,CQ)作用胃癌细胞MGC803不同时间段对其分泌白细胞介素-6(IL-6)的影响。方法:应用免疫荧光染色的方法检测胃癌MGC803细胞中TLR9的表达;运用CCK-8法检测CQ作用细胞24,48,72 h后,观察药物对细胞活性的影响;ELISA方法检测不同浓度CQ作用MGC803细胞不同时间点后,细胞上清液中IL-6的活性水平。结果:免疫荧光染色方法显示胃癌MGC803细胞上有TLR9的表达;CCK-8法检测不同浓度的抑制剂作用细胞3个时间段后对细胞的生长均具抑制作用,差异有显著性(P<0.05);ELISA结果表明,200 mg.L-1CQ作用细胞24,48,72 h后均可抑制IL-6的表达,而50,100 mg.L-1的CQ仅在作用细胞72 h后抑制IL-6的表达,且差异具显著性(P<0.05)。结论:胃癌细胞系MGC803表达有TLR9;TLR9抑制剂CQ可抑制IL-6的表达。     

雄黄诱导人胃癌MGC -803细胞凋亡

目的 观察雄黄体外抗人胃癌MGC - 803细胞作用及其可能作用机制.方法 采用MTS法和细胞克隆实验法观察雄黄对MGC - 803细胞增殖的影响,应用PI/Hoechest33258双染法和流式细胞仪检测细胞凋亡,荧光分光光度计检测细胞内钙和线粒体膜电位,荧光定量PCR测Bad mRNA的表达.结果 雄黄能剂量依赖性地抑制MGC - 803细胞的生长和克隆形成.雄黄作用后,MGC-803细胞出现凋亡形态学改变如染色质浓缩等;流式细胞仪检测显示,雄黄能剂量依赖性地诱导细胞凋亡,其中,225 μg/ml雄黄引起MGC-803细胞凋亡的百分率为(43.6±5.4)％.雄黄能剂量依赖性的引起MGC-803细胞的细胞内钙升高和线粒体膜电位降低,并上调Bad mRNA的表达.结论 雄黄具有一定的抗肿瘤作用,并能诱导细胞凋亡,可能与钙依赖的凋亡通路有关.     

白藜芦醇对MGC803细胞凋亡因子Bad,p-Bad,Caspase-3的影响

目的:探讨白藜芦醇(resveratrol,Res)对人胃癌细胞MGC803细胞凋亡因子及其磷酸化的影响,研究白藜芦醇抗胃癌的作用机制。方法:采用0,50,100,200μmol·L~(-1)Res处理MGC803细胞后,采用台盼蓝法测定MGC803细胞生长抑制率;流式细胞术(FCM)检测细胞凋亡率;免疫组化法检测促凋亡蛋白(Bad),含半胱氨酸的天冬氨酸蛋白水解酶-3(Caspase-3)蛋白表达;蛋白质印迹法(Western blot)检测Bad,磷酸化Bcl-x1/Bcl-2相关死亡启动子(p-Bad),Caspase-3蛋白的表达。结果:随着浓度增加Res抑制胃癌MGC803细胞生长作用明显增强(P0.01);Res(100μmol·L~(-1))能明显下调MGC803细胞中Bad,p-Bad蛋白表达,同时可上调Caspase-3蛋白表达。结论:Res可以诱导MGC803细胞凋亡,其凋亡与浓度、时间有一定的依赖性;Res诱导MGC803细胞凋亡可能与其下调Bad,p-Bad蛋白和上调Caspase-3蛋白表达有关。     

5-FU联合人参黄芪复方对人胃癌MGC-803细胞生物学行为的影响

目的探讨中药人参黄芪复方联合5-氟尿嘧啶（5-Fu）,在体外对人胃癌MGC-803细胞的增殖、克隆、凋亡、迁移等生物学行为的影响。方法采用MTT方法检测细胞的增殖抑制率;并计算其中效浓度;流式细胞仪检测观察细胞的周期及凋亡;Giemsa染色检测细胞的克隆形成;细胞划痕实验检测药物对细胞迁移的抑制作用。结果人参黄芪复方和5-Fu均能抑制人胃癌MGC-803细胞生长,并随着药物浓度的增加而增强,5-Fu联合人参黄芪复方对细胞生长的抑制率明显高于单用人参黄芪复方或5-Fu组（P〈0．05）,并随着浓度的增加而增强;人参黄芪复方和5-Fu均能诱导胃癌细胞凋亡、抑制细胞克隆形成、阻滞细胞于G0／G1期、并抑制细胞迁移,而两药联用时细胞凋亡率、G0／G1期细胞均明显高于两药单用（P〈0．05）,并阻滞细胞于G0／G1期;人参黄芪复方与5-FU联合应用时细胞克隆形成、细胞迁移面积均明显低于两药单用（P〈0．05）,且联合用药的中效浓度小于两药单用时的中效浓度之和。结论人参黄芪复方和5-Fu联合应用与两药单用比较,能更好的抑制人胃癌MGC-803细胞增殖、抑制细胞克隆形成、促进细胞凋亡、阻滞细胞期于G0／G1期,并抑制细胞迁移。     

复合螺旋藻多糖对人胃癌MGC细胞的抑制作用

目的 研究复合螺旋藻多糖对人胃癌MGC细胞的抑制作用.方法 将螺旋藻多糖(PSP)与银杏叶有效成分(GBE)以不同剂量按一定比例复合,观察复合制剂在体外对人胃癌MGC细胞的抑制作用.结果 PSP与GBE 1:1比例复合组、1:2比例复合组和2:1比例复合组对人胃癌MGC细胞的抑制率,高剂量时分别比空白对照组提高92.44%(P<0.01),26.36%(P<0.01)和71.32%(P<0.01);中剂量时分别比空白对照组提高62.37%(P<0.01),20.57%(P<0.01)和24.15%(P<0.01);低剂量时分别比空白对照组提高27.94%(P<0.01),30.36%(P<0.01)和17.92%(P<0.01).结论 单一成分的螺旋藻多糖组对人胃癌MGC细胞也有较好的抑制作用,并呈剂量依赖性.高、中剂量复合螺旋藻多糖对人胃癌MGC细胞的抑制作用,1:1比例配比时抑制效果最好.其中高剂量组1:1配比时抑制率达到92.4%.表明复合螺旋藻多糖在该剂量配比时协同增效作用最大.     

没食子酸体外抗胃癌细胞MGC-803机制的研究

目的 探讨没食子酸(gallic acid,GA)体外对胃癌细胞株MGC-803的抑制作用及机制.方法 体外培养人胃癌细胞株MGC-803,MTT法观察细胞生长情况;Hoechst-33258、AnnexinV-FITC/PI检测细胞凋亡情况;RT-PCR方法研究Survivin的mRNA的变化.结果 MTT检测6.25～50μmol/LGA 抑制MGC-803的生长,并呈剂量依赖性.Hoechest-33258显示出明显的细胞凋亡形态.用Annexin V-FITC/PI检测细胞凋亡率有显著的剂量依赖性.同时RT-PCR反映了GA作用后,胃癌细胞中Survivin mRNA表达减少.结论 GA可抑制胃癌细胞MGC-803的增殖,其作用机制可能与下调相关凋亡基因Survivin有关.     

和厚朴酚与青蒿素体外抗人胃癌MGC-803细胞的作用研究

目的考察和厚朴酚、青蒿素抗肿瘤及两者联合用药的效果。方法采用MTT测定和厚朴酚、青蒿素对人胃癌MGC-803细胞、正常肝细胞LO2抑制作用,用IC50评测体外直接抗肿瘤效果,用金氏公式进行联合用药分析。结果 20μg/ml的和厚朴酚对人胃癌MGC-803细胞具有快速而不可逆的杀伤作用;和厚朴酚能抑制人胃癌MGC-803细胞、正常肝细胞LO2的增殖,IC50分别为3.96,8.04μg/ml。青蒿素对其没有明显的抑制作用,IC50分别为64.85、93.92μg/ml。3.5μg/ml的和厚朴酚与12.5,10,7.5μg/ml的青蒿素联合应用对人胃癌MGC-803细胞体外抑制呈相加作用,Q值分别为1.05,1.04,1.12;与30,20,15μg/ml青蒿素联合应用对人胃癌MGC-803细胞体外抑制呈协同作用,Q值分别为1.21,1.31,1.24;2μg/ml和厚朴酚与30,20,15,12.5,10,7.5μg/ml青蒿素联合应用对人胃癌MGC-803细胞体外抑制呈协同作用Q值分别为1.27,1.28,1.32,1.39,1.16,1.25。结论和厚朴酚对MGC-803细胞较强的抑制肿瘤生长的作用;青蒿素对人胃癌MGC-803细胞、正常肝细胞LO2的毒性低,和厚朴酚与青蒿素联合应用对人胃癌MGC-803细胞可产生协同作用或相加作用。     

四君子汤对脾虚证胃癌MGC803细胞周期凋亡及Caspase-3表达的影响

目的:探讨四君子汤对脾虚证胃癌MGC803细胞周期凋亡及Caspase-3表达。方法:采用倒置显微镜观察人胃癌MGC803细胞形态学变化,透射电镜观察染色情况,采用流式细胞术检测细胞周期及凋亡,采用免疫组化法检测Caspase-3蛋白表达情况。结果:倒置显微镜下5umol/L四君子汤组作用48 h后胃癌细胞数目减少,细胞分裂不明显,体积明显缩小,可发现核固缩现象以及圆形体积变小的凋亡小体形成;透射电镜下5umol/L四君子汤处理后细胞膜微绒毛减少,胞质有所浓缩且细胞体积变小,核染色聚集与核膜,电子密度高,可见明显的凋亡小体;流式细胞仪检测结果显示,四君子汤可诱导MGC803发生凋亡,细胞周期检测显示G0/G1期比值明显增加,而在S其与G2/M期则降低,故在G0/G1期发生阻滞;5umol/L四君子汤组Caspase-3表达显著高于0.1%DMSO组,差异有统计学意义。结论:四君子汤对脾虚证胃癌MGC803具有明显促凋亡作用,细胞周期阻滞在G0/G1期,且通过增加Caspase-3表达而促进其凋亡。     

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??OBJECTIVE To investigate the effects of a monomer purified from Paris Polyphylla(PP-22) on proliferation,apoptosis of human gastric carcinoma MGC803 cells and to study the sensitizing effect of PP-22 on the proliferation of MGC803 cells to chemotherapeutic drugs 5-fluorouracil(5-Fu) or lobaplatin. METHODS MTT assay and cell colone formation inhibitory assay were used to determine the inhibitory effect of PP-22 on human gastric carcinoma MGC803 cells.The sensitizing effects of PP-22 on MGC803 cells to chemotherapeutic drugs 5-Fu, lobaplatin were determined by MTT assay.The percentage of apoptotic cells and cell cycle distribution were determined by flow cytometry.The expression of cell apoptosis associated proteins were analyzed by Western blotting.RESULTS MTT assay showed that PP-22 inhibited gastric carcinoma MGC803 cells proliferation in dose-dependent manner (r=0.90,P<0.05), but did not inhibit the growth of normal liver L02 cells at the same concentration. Cell colony formation inhibitory assay demonstrated that cell clones decreased with the increase of drug concentrations. The chemosensitivity of 5-Fu,or lobaplatin combined with PP-22 was improved compared with PP-22 group,respectively.PI staining analysis showed that the cell cycle was arrested at S phase. Western blotting detecting showed that the expression of Caspase-9, Caspase-3 were downregulated, the anti-apoptotic protein Bcl-2 is downregulated and pro-apoptotic protein Bak upregulated.CONCLUSION PP-22 inhibits proliferation and induces apoptosis of MGC803 cells effectively and also sensitizes MGC803 cells to chemotherapeutic drugs.     

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??OBJECTIVE To screen the best combination of extractum of Robinia-living trametes and chemotherapy and investigate the action mechanism of Robinia-living trametes against the apoptosis of human gastric cancer cell MGC803. METHODS MGC803 Cells were treated with different concentrations of Robinia-living trametes and chemotherapy drugs (5-Fu and paclitaxel) in vitro. The inhibitory rate of cells was measured by MTT assay. Morphological changes were observed with inverted microscope. The apoptosis rate of MGC803 cells which were treated with combination of Robinia-living trametes(0.2 mgmL^-1) and 5-Fu (2.5 ??gmL^-1) was detected by FCM. The protein expression of P53 and p-Akt in MGC803 cells which were treated with combination of Robinia-living trametes (0.2 mgmL^-1) and 5-Fu (2.5 ??gmL^-1) was detected by Western blot. RESULTS The viability of MGC803 cells was reduced by Robinia-living trametes and chemotherapy drugs (5-Fu and paclitaxel) in a concentration- and time-dependent manner(P<0.01). Under reverse microscopy, cell body shrinking, nuclear pyrosis, and nuclear fragmentation were observed. The higher concentration, the longer treatment time, the more cells died. Compared with monotherapy, the combination of Robinia-living trametes and chemotherapy could reduce the survival rate of MGC803 cells. The protein expressions of P53 in MGC803 cells treated with combination of drugs was up-regulated, while that of P-Akt was down-regulated. CONCLUSION The apoptosis of MGC803 cells in vitro may be induced by the inhibitory effect of the combination of Robinia-living trametes and 5-Fu on PI3K/Akt signaling pathway. Combination therapy of Robinia-living trametes and 5-Fu is potentially more effective in inhibition of tumor cells than monotherapy of Robinia-living trametes.     

芪竹方中单体及配伍对人胃癌细胞MGC-803抑制作用研究

目的:观察芪竹方单体成分薯蓣皂苷、莪术醇及两者配伍对人胃癌细胞MGC-803的增殖抑制作用,初步探讨芪竹方复方在抗肿瘤治疗中的有效成分及作用机制。方法:选用5个剂量的薯蓣皂苷、莪术醇单药组,及2个剂量的两药配伍组在24h、48h 2个不同时间点作用人胃癌细胞MGC-803,采用MTT法检测药物对MGC-803的增殖抑制率。结果:一定浓度范围内,薯蓣皂苷及莪术醇均对MGC-803细胞的增殖有剂量、时间依赖性抑制作用,且两药配伍使用较单药能产生更好的抑制作用。结论:薯蓣皂苷及莪术醇可能为芪竹方抑制人胃癌细胞MGC-803增殖的有效成分。     

Antiproliferative Activity of Phenylpropanoids Isolated from Lagotis brevituba Maxim

The aim of the present study was to evaluate the antiproliferative effect of phenylpropanoids isolated from the n‐BuOH‐soluble fraction of an ethanolic extract of Lagotis brevituba Maxim. The phenylpropanoids were identified as echinacoside, lagotioside, glucopyranosyl(1–6)martynoside, plantamoside, and verbascoside. Three of the compounds, lagotioside, glucopyranosyl(1–6)martynoside, and plantamoside, were isolated from L. brevituba for the first time. The antiproliferative activity of the isolates was evaluated in human gastric carcinoma (MGC‐803), human colorectal carcinoma (HCT116), human hepatocellar carcinoma (HepG2), and human lung cancer (HCT116) cells using an 3‐(4,5‐dimethylthiazol‐2‐yl)‐2,5‐diphenyltetrazolium bromide assay. Plantamoside showed promising activity against MGC‐803 cells, with a half maximal inhibitory concentration value of 37.09 μM. The mechanism of the pro‐apoptosis effect of plantamoside was then evaluated in MGC‐803 cells. Changes in cell morphology, including disorganization of the architecture of actin microfilaments and formation of apoptotic bodies, together with cell cycle arrest in G2/M phases, were observed after treatment of plantamoside. The antiproliferative and pro‐apoptotic effects were associated with a decrease in the ratio of Bcl‐2/Bax and reduced mitochondrial membrane potential, which was accompanied by the release of reactive oxygen species and Ca²⁺ into the cytoplasm. Taken together, the results indicated that plantamoside promotes apoptosis via a mitochondria‐dependent mechanism. Copyright © 2017 John Wiley & Sons, Ltd.     

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??OBJECTIVE To investigate the effects of combination treatment with L-carnitine and 5-fluorouracil on the proliferation and cell apoptosis of gastric cancer MGC803 cells. METHODS MGC803 cells were divided into control group, 5-fluorouracil group and the combination of L-carnitine and 5-fluorouracil group (L-carnitine+/??5-fluorouracil group) in vitro. The inhibitory rate of cells was measured by MTT assay. The apoptosis rate and cell cycle of cells were detected by FLOW. Western blot was used to analyzed the expression of Bcl-2, Bax, adenine nucleotide translocator1(ANT1) and cleaved-PARP. RESULTS Compared with 5-fluorouracil group, the inhibition rate of MGC803 cells was increased when cells were treated with the combination of L-carnitine and 5-fluorouracil. The apoptosis rate of cells was raised and the cells were blocked at S phase. In addition, the combination group can decrease the expression of Bcl-2 and increase the expression of Bax, ANT1 and cleaved-PARP. At the same time, the apoptosis rate of cells and the cell cycle were different with the different dosage regimen when treated with the combination. Compared with the L-carnitine+5-fluorouracil group, the apoptosis rate of cells was increased to (24.17??3.12)% from (19.60??1.06)% (P<0.05). The G₀/G₁ phase proportion of cells was decreased to (62.62??1.04)% from (72.95??0.91)%,and the S phase proportion of cells was increased to (37.35??1.03)% from (27.05??0.91)% (P<0.001). CONCLUSION Treatment with L-carnitine and 5-fluorouracil could enhance the inhibitory effect of 5-fluorouracil on MGC803 cells. The possible mechanism of action is achieved by regulating the expression of Bcl-2 protein family and influencing the cell cycle.     

一株连翘内生真菌代谢粗提物对胃癌细胞株MGC-803增殖的影响

目的：评价一株连翘内生真菌代谢粗提物体外对胃癌细胞株MGC-803增殖的影响,为寻找临床胃癌治疗新药提供思路。方法：采用常规分离手段分离得到连翘内生真菌26株,应用MTT法测定其发酵代谢产物粗提物对MGC-803增殖的影响。结果：MGC-803经内生真菌FS12的发酵代谢产物粗提物FE-12作用后细胞克隆受到明显的抑制,且在时间和剂量上存在一定的依赖性。结论：连翘内生真菌FS12的发酵粗提物FE-12可抑制胃癌细胞株MGC-803增殖,为寻找临床胃癌治疗新药提供了一条新的思路。     

通莲汤对荷瘤裸鼠的抑瘤作用及机制研究

目的:探讨复方通莲汤对胃癌MGC803细胞荷瘤裸鼠的抑瘤作用及对肿瘤组织增殖细胞核抗原(PCNA)表达的影响,为其临床应用提供实验依据。方法:胃癌细胞株MGC803接种于裸鼠右前肢皮下。模型组ig生理盐水溶液10 mL·kg-1,阳性对照组ig消癌平片1.80 g·kg-1的药液10 mL·kg-1,复方通莲汤高、中、低剂量组分别ig 1.50,0.75,0.37 g·kg-1的药液10 mL·kg-1,各组连续给药3周,再连续观察3周,6周内连续测定裸鼠瘤体体积,最后脱臼处死全部裸鼠,分离瘤组织,计算抑瘤率,免疫组织化学法检测肿瘤组织PCNA表达。结果:通莲汤抑制瘤体生长与时间呈正相关,开始给药后第4周达抑瘤峰值;通莲汤高剂量组瘤重(1.55±0.68)g,抑瘤率为(58.40±1.56)%,与模型组比较有显著性差异(P<0.05);通莲汤可显著抑制PCNA表达(P<0.05)。结论:通莲汤可抑制裸鼠人胃癌MGC803细胞移植瘤生长,其抑瘤机制与下调肿瘤细胞PCNA蛋白表达有关。     

肉桂酸和1,25-二羟维生素D_3联用对人胃腺癌细胞的诱导分化作用

目的观察肉桂酸(CINN)和1,25-二羟维生素D3(1,25-(OH)2D3)联合用药对人胃腺癌MGC-803细胞的诱导分化作用。方法 1,25-(OH)2D3和CINN联合用药(2 mmol/L CINN+10-6mmol/L 1,25-(OH)2D3、1 mmol/L CINN+10-5mmol/L 1,25-(OH)2D3)及单独用药作用于MGC-803细胞48 h后,应用四甲基偶氮唑蓝(MTT)法测定细胞增殖能力,平板克隆试验测定细胞集落形成率,流式细胞仪测定细胞周期,TRAP-银染法测定端粒酶活性。结果 1,25-(OH)2D3和CINN联合用药后胃腺癌细胞生长明显受抑制,细胞周期出现向G0/G1期移行的特征性动力学改变,端粒酶活性明显受到抑制。细胞集落形成率明显下降。结论 CINN和1,25-(OH)2D3联合用药对人胃腺癌细胞的诱导分化具有协同作用。