秦皮乙素对人胃癌SGC-7901细胞增殖、迁移、侵袭和糖酵解的影响

目的探讨秦皮乙素(AES)对胃癌SGC-7901细胞增殖、迁移、侵袭和糖酵解的影响及相关机制。方法采用MTT法检测细胞增殖活性;采用划痕实验和Transwell实验检测细胞迁移和侵袭能力;葡萄糖摄取量测定和乳酸含量测定实验检测细胞糖酵解情况;Western blot法检测迁移、侵袭及糖酵解相关蛋白的表达水平。结果AES能够抑制SGC-7901细胞的增殖活力,且这种抑制效果与AES的剂量成正相关。随着AES剂量的梯度增加,SGC-7901细胞的迁移、侵袭及糖酵解能力逐渐降低(P<0.05)。AES可以下调SGC-7901细胞HIF-1α、MMP-2、MMP-9、GLUT1、LDHA蛋白的表达水平(P<0.05)。结论AES对人胃癌SGC-7901细胞增殖活性及迁移、侵袭能力有抑制作用,通过抑制人胃癌SGC-7901细胞的葡萄糖摄取及乳酸生成降低糖酵解水平。AES可能通过影响缺氧诱导因子HIF-1α抑制SGC-7901细胞迁移、侵袭及有氧糖酵解过程。

Effects of Leaf Extract of Phyllanthus reticulatus from Guangxi on Human Gastric Cancer SGC-7901 Cells in vitro

[Objectives]To observe the effect of drug-containing serum from different extracts of Phyllanthus reticulatus leaf on the proliferation of human gastric cancer SGC-7901 cells and the effect of in vivo on the life extension rate of mice with H22 ascites tumor,and to investigate the effects of chemical components such as Corilagin,ethyl gallate,ethyl brevifolincarboxylate,and gallic acid on the proliferation of human gastric cancer SGC-7901 cells.[Methods]MTT method was used to observe the inhibitory effect of drug-containing serum of different extracts of P.reticulatus leaf on human gastric cancer SGC-7901 cells in vitro to determine its active site.The active site was used as the research object to establish a Kunming mouse ascites tumor model,to investigate the effect on the life extension rate of mice with H22 ascites tumor,to further separate the monomer components from the effective fraction and investigate its effect on human gastric cancer SGC-7901 cells.[Results]Compared with the 10%blank serum control group,10%drug-containing serum of ethyl acetate and n-butanol in P.reticulatus leaf had significant inhibitory effect on the proliferation of human gastric cancer SGC-7901 cells,and the inhibition rate was 34.99%and 28.68%,respectively(P<0.05).Compared with the blank group,the survival time of the high dose group of ethyl acetate in P.reticulatus leaf was significant(P<0.05).Gallic acid,Corilagin,and Brevifolincarboxylic acid ethyl ester had a significant inhibitory effect on the proliferation of human gastric cancer SGC-7901 cells,with IC 50 of 26.52,70.45,and 158.86μg/mL,respectively.Ethyl gallate had no inhibitory effect on the proliferation of human gastric cancer SGC-7901 cells,and its IC 50 was 251.96μg/mL.[Conclusions]The drug-containing serum of ethyl acetate and n-butanol extract of P.reticulatus can inhibit the proliferation of human gastric cancer SGC-7901 cells.Ethyl acetate of P.reticulatus leaves can increase the life extension rate of mice with H22 ascites tumor.Gallic acid,Corilagin,and Brevifolincarboxylic acid ethyl ester isolated from its active site are the material basis for inhibiting the proliferation of human gastric cancer SGC-7901 cells.

Crebanine N-oxide, a natural aporphine alkaloid isolated from Stephania hainanensis, induces apoptosis and autophagy in human gastric cancer SGC-7901 cells

Objective: To investigate the cytotoxic effects and the potential mechanisms of crebanine N-oxide in SGC-7901 gastric adenocarcinoma cells. Methods: The cytotoxicity of crebanine N-oxide was evaluated by 3-(4,5-dimethyl-2-thiazolyl)-2,5-diphenyl-2-H-tetrazolium bromide assay and cellular morphology was observed under a microscope. Cell apoptosis was determined by flow cytometry using propidium iodide staining. The expression levels of apoptotic-related proteins, cleaved caspase-3, cytochrome C, p53 and Bax, and autophagyrelated proteins p62, beclin1 and LC3 were detected by Western blotting assays. Results: Crebanine N-oxide treatment significantly inhibited the proliferation of SGC-7901 cells in a dose-dependent and timedependent manner via induction of G2-phase cell cycle arrest, apoptosis, and autophagy in SGC-7901 cells.Conclusions: Crebanine N-oxide could inhibit the growth of gastric cancer cells by promoting apoptosis and autophagy and could be used as a potential agent for treating gastric cancer.

Low intensity ultrasound-induced apoptosis in human gastric carcinoma cells

AIM: To investigate the low intensity ultrasound (US)-induced apoptosis in human gastric carcinoma cells and its potential mechanism and to suggest a new therapeutic approach to gastric carcinoma. METHODS: Human SGC-7901 gastric carcinoma cells were cultured in vitro and irradiated by low intensity US for 10 min at different intensities with different incubation times after irradiation. Morphologic changes were examined under microscope with trypan blue staining and then the percentage of early apoptotic cells was detected by flow cytometry (FCM) with double staining of fluorescein isothiocyanate (FITC)-Annexin V/propidium iodide (PI). Two-dimensional electrophoresis (2DE) was used to get the protein profile and some proteins differently expressed after US irradiation were identifi ed by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF-MS). Functional analysis was performed to investigate the mechanism of US-induced cell apoptosis. RESULTS: The percentage of apoptotic cells increased about 10% after US irradiation (12.0 W/cm^2, 12 h culture). The percentage of early apoptosis and secondary necrosis in the US-irradiated cells increased with the increased US intensity. Moreover, apoptotic cells increased with the increased culture time after US irradiation and reached its maximum at about 12 h.Several new proteins appeared after US irradiation and were up or down regulated more than 2 times. Some heat shock proteins (HSPs) were found to be associated with the signal process simulating the apoptosis of cells. CONCLUSION: Low intensity US could induce apoptosis in human gastric carcinoma cells. US-induced apoptosis is related to US intensity/culture time. US-induced apoptosis may be caspases-dependent and endoplasmic reticulum (ER) stress-triggered apoptosis may also contribute to it. Proteomic experimental system is useful in finding the protein alteration in carcinoma cells after US irradiation, helping to develop a new cancer therapy.

Etoposide Induces Mitochondria-Associated Apoptotic Cell Death in Human Gastric Carcinoma Cells

Recent observations indicate that the resistance of apoptosis is an important process of tumor metastasis and metastases are the cause of 90% of human cancer death. Etoposide, a semisynthetic derivative of the podophyllotoxins, is a clinically used anti-cancer reagent, but the effects of it on metastatic gastric carcinoma cells are totally unknown. In this study, etoposide induced apoptotic cell death in human gastric adenocarcinoma cell line SGC-7901, derived from metastatic lymph nodes, as evidenced by the analysis of DNA fragmentation, apoptotic body formation, caspase activation, and apoptosis specific changes in cell morphology is demonstrated. The depolarization of mitochondrial membrane and the release of cytochrome c were most early events in etoposide treated SGC-7901 cells, and were followed by caspase-3 activation and PARP cleavage. Caspase-8 activation was not detected under the same condition. Thus, it was proposed that etoposide induces caspase-associated apoptotic cell death in human metastatic gastric carcinoma, which is initiated by mitochondrial cytochrome c release.

Growth inhibitory effect of 4-phenyl butyric acid on human gastric cancer cells is associated with cell cycle arrest

AIM: To investigate the growth effects of 4-phenyl butyric acid (PBA) on human gastric carcinoma cells and their mechanisms. METHODS: Moderately-differentiated human gastric carcinoma SGC-7901 and lowly-differentiated MGC-803 cells were treated with 5, 10, 20, 40, and 60 μmol/L PBA for 1-4 d. Cell proliferation was detected using the MTT colorimetric assay. Cell cycle distributions were examined using flow cytometry.RESULTS: The proliferation of gastric carcinoma cells was inhibited by PBA in a doseand time-dependent fashion. Flow cytometry showed that SGC-7901 cells treated with low concentrations of PBA were arrested at the G0/G1 phase, whereas cells treated with high concentrations of PBA were arrested at the G2/M phase. Although MGC-803 cells treated with low concentrations of PBA were also arrested at the G0/G1 phase, cells treated with high concentrations of PBA were arrested at the S phase. CONCLUSION: The growth inhibitory effect of PBA on gastric cancer cells is associated with alteration of the cell cycle. For moderately-differentiated gastric cancer cells, the cell cycle was arrested at the G0/G1 and G2/M phases. For lowly-differentiated gastric cancer cells, the cell cycle was arrested at the G0/G1 and S phases.

Inhibitory Effect of α-Pinene on SGC-7901 Cell Proliferation and the Mechanism of ATM Kinase Signaling Pathway

Objective: To research the inhibitory effect on SGC-7901 cells of α-pinene, and the related mechanism of α-pinene. Methods: Used the MTT method to detect inhibition rate and western blotting to detect the influence on expression of ATM, Phos-S1981ATM, H2AX, γH2AX, CHK2 and p-CHK2, p53 and phos-p53 cell cycle related protein in SGC-7901 cells. Results: The research found α-pinene could inhibit the proliferation of SGC-7901 cells observably in vitro, and the inhibition rate assumes the dependence on concentration;and western blotting results showed that, α-pinene could activate phospho-ATM, increase the amount of γH2AX (p p < 0.05);increase the expression of p-CHK2, p53 and phos-p53 (p p p < 0.05);But there is no significant effect on expression of CHK2 (p > 0.05). Conclusions: α-pinene could inhibit the proliferation of SGC-7901 cells, and by inducing ATM (Ataxia Telangiectasia-Mutated) kinase signal pathway in DNA damage response, activating cell cycle checkpoint, making the cell cycle arrest then exerts its anti-tumor effects.

苦荞异槲皮苷对人胃癌细胞SGC-7901增殖及凋亡的影响

从苦荞中提取制备异槲皮苷,研究其对人胃癌细胞SGC-7901增殖、凋亡、迁移和细胞周期的影响。将异槲皮苷作用于人胃癌SGC-7901细胞和人肾上皮细胞系293T,通过噻唑蓝法检测异槲皮苷对其增殖的影响;4’,6-二脒基-2-苯基吲哚(4’,6-diamino-2-phenyl indole,DAPI)荧光染色法观察细胞核的形态学变化;划痕擦伤迁移实验检测异槲皮苷对SGC-7901细胞迁移能力的影响;流式细胞术检测异槲皮苷对SGC-7901细胞凋亡及细胞周期的影响。结果表明:苦荞异槲皮苷可以抑制SGC-7901细胞的增殖,并呈时间和剂量依赖性,当用100μmol/L异槲皮苷作用细胞48 h后,对SGC-7901细胞的增殖抑制率达到35.92%,而对人肾上皮细胞系293T的增殖抑制率仅为3.15%;DAPI荧光染色法观察异槲皮苷处理细胞后,染色体凝聚,有凋亡小体产生;划痕擦伤实验显示,异槲皮苷能抑制SGC-7901细胞的迁移;流式细胞术检测结果表明,异槲皮苷可使G1和S期细胞减少,G2/M期细胞增多,且细胞凋亡率明显增加。综上所述,苦荞麦异槲皮苷能够诱导SGC-7901细胞发生凋亡,阻断细胞周期并抑制细胞增殖和迁移。

ING4基因对人胃癌细胞SGC-7901生物行为的影响

目的:研究人ING4对人胃癌细胞SGC-7901的影响,探讨其作用机制。方法:将重组腺病毒质粒pAd-ING4用PacI线性化,经脂质体转染QBI-293A细胞,获得重组病毒Ad-ING4。Ad-ING4感染人SGC-7901细胞,RT-PCR及Western blot分析ING4和p21表达,MTT法检测Ad-ING4对细胞生长的影响,激光共聚焦显微镜检测细胞凋亡。结果:Ad-ING4感染后,SGC-7901细胞中有ING4 mRNA和蛋白质表达,细胞生长受到明显抑制,与野生型SGC-7901细胞相比,p21表达水平增高,细胞凋亡率明显增高,P<0.05。结论:ING4可通过上调p21表达发挥抑制SGC-7901细胞生长、诱导细胞凋亡的作用。

芫菁体内结合斑蝥素对胃癌SGC-7901细胞增殖的抑制作用

本文考察了芫菁体内结合斑蝥素和人工合成的斑蝥素盐类衍生物斑蝥素酸镁的体外抗肿瘤活性。采用WST-1法检测两者在体外对人胃腺癌SGC-7901细胞增殖的抑制作用。实验结果显示两者对SGC-7901细胞均表现出明显的抑制效果,且随药物浓度升高其抑制作用增强,呈剂量效应关系;其半数抑制浓度(IC50)分别为10.86和8.65μmol/L。此外,通过流式细胞术检测表明,结合斑蝥素能引起SGC-7901细胞G0～G1期阻滞;斑蝥素酸镁则引起SGC-7901细胞S期阻滞,两者均能通过干预SGC-7901细胞的周期来抑制其增殖。

猫儿眼植物酸对人SGC-7901细胞增殖的影响及其机制探讨

目的探讨猫儿眼植物酸对人SGC7901细胞增殖影响及其机制。方法采用流式细胞仪、MTT法和台盼蓝染色法测定猫儿眼植物酸对人SGC7901细胞增殖的影响。结果分别给予猫儿眼植物酸10.0、1.0、0.1mg·L-1培养48h,MTT法测定结果显示,猫儿眼植物酸对人SGC7901细胞增殖的抑制率分别为82.9%、42.7%和24.6%;台盼蓝法计数结果显示,给予猫儿眼植物酸后,活细胞数随培养时间的延长而减少,到48h,对SGC7901细胞增殖抑制率分别为76.4%、56.9%、42.6%,凋亡率分别为26.8%,22.5%和15.6%。结论猫儿眼植物酸对人SGC7901细胞增殖具有明显的抑制作用,其抑制作用强度随给药浓度的增加和作用时间的延长而递增。

芹菜素对人胃癌细胞SGC-7901增殖的影响及机制研究

目的探讨芹菜素对胃癌细胞SGC-7901增殖及葡萄糖摄取的影响及其可能的内在机制。方法采用MTT法检测不同剂量不同作用时间芹菜素对SGC-7901细胞增殖的影响;采用葡萄糖检测试剂盒检测芹菜素对SGC-7901细胞葡萄糖摄取量的影响;蛋白免疫印迹实验检测芹菜素作用SGC-7901细胞后,葡萄糖转运体1(GLUT1)和己糖激酶Ⅱ(HKⅡ)表达水平的影响。结果芹菜素对胃癌细胞SGC-7901具有增殖抑制作用,并具有一定的剂量和时间依赖性,差异有统计学意义(P<0.05,P<0.01);芹菜素干预后的SGC-7901细胞的葡萄糖摄取量明显减少,芹菜素10μmol/L和20μmol/L组与对照组比较,差异有统计学意义(P<0.01);一定剂量的芹菜素能下调SGC-7901细胞中GLUT1、HKⅡ蛋白的表达水平,具有一定的时间和剂量依赖性。结论芹菜素能抑制胃癌细胞SGC-7901的增殖和葡萄糖摄取的作用,其机制可能与调控GLUT1、HKⅡ蛋白表达水平有关,为临床胃癌的诊断和治疗提供了一定的理论基础。

白屈菜碱对SGC-7901细胞Cdk1、cyclinB1表达影响

研究白屈菜碱对人胃癌SGC-7901细胞Cdk1、p-Cdk1(Thr14)、cyclinB1蛋白表达,探讨白屈菜碱诱导人胃癌SGC-7901细胞G2/M期阻滞的机制.采用Western blotting法测定白屈菜碱对SGC-7901细胞Cdk1、p-Cdk1(Thr14)、cyclinB1蛋白表达的影响.不同质量浓度的白屈菜碱可显著下调人胃癌SGC-7901细胞内Cdk1与cyclinB1蛋白表达水平,同时显著上调p-Cdk1(Thr14)蛋白的表达水平,并呈一定的剂量依赖性.白屈菜碱可下调SGC-7901细胞内Cdk1和cyclinB1蛋白的表达,上调p-Cdk1(Thr14)蛋白的表达,这可能是白屈菜碱诱导SGC-7901细胞G2/M期阻滞的主要机制之一.

隐丹参酮对人胃癌SGC-7901细胞增殖及血管内皮生长因子mRNA表达的影响

目的通过测定隐丹参酮对人胃癌SGC-7901细胞增殖及血管内皮生长因子（VEGF）mRNA的影响,探讨其抗肿瘤的作用机制。方法采用四甲基偶氮唑蓝（MTT）比色法检测隐丹参酮对人胃癌SGC-7901细胞增殖的影响,采用Real Time RT-PCR检测隐丹参酮对VEGF m RNA表达的影响。结果 20、40、60、80、100μmol/L的隐丹参酮作用于人胃癌SGC-7901细胞6-48 h,其生长和增殖均受到一定程度的抑制;24 h为隐丹参酮对SGC-7901细胞抑制作用的最佳时间,IC50为59.11μmol/L;选取40、60和80μmol/L 3个剂量作用于人胃癌细胞SGC7901 24 h后,60和80μmol/L的隐丹参酮均可下调VEGF m RNA的表达（均P〈0.01）。结论隐丹参酮可抑制人胃癌SGC-7901细胞增殖,并能抑制VEGF mRNA的表达,提示这可能是其抗肿瘤的作用机制之一。

铁线莲皂苷对人胃癌SGC-7901细胞凋亡及NF-κB表达的影响

目的:观察扬子铁线莲中提取的三萜类皂苷成分对人胃癌SGC-7901细胞株生长及凋亡的作用,研究其对核转录因子NF-κB活性的影响,初步探讨其可能的作用机制。方法:应用不同浓度铁线莲皂苷作用于SGC-7901细胞48h后,MTT法检测细胞生长抑制率;流式细胞仪Annexin V/PI双染法检测联合应用铁线莲皂苷及5-氟尿嘧啶(5-FU)后SGC-7901细胞凋亡率;应用Western blot方法检测各组胞核中NF-κBp65表达情况;酶联免疫吸附试验(ELISA)进一步确定胞核内NF-κB的活性。结果:铁线莲皂苷各浓度组对胃癌SGC-7901细胞生长抑制率均明显高于对照组(P<0.05),且随药物浓度的增加而上升。铁线莲皂苷对5-FU诱导的细胞凋亡有明显的促进作用。Western blot及ELISA法均证实铁线莲皂苷对胞核NF-κB表达及活性有一定的抑制作用,并且这种抑制作用存在着剂量依赖现象。结论:铁线莲皂苷对胃癌SGC-7901细胞具有抑制增殖、诱导凋亡的作用,其诱导细胞凋亡的机制可能与抑制胞核NF-κB表达有关。

β-紫罗兰酮诱导SGC-7901细胞凋亡作用

目的探讨β-紫罗兰酮对胃腺癌SGC-7901细胞的凋亡作用及其可能机制。方法采用细胞生长曲线、核分裂、Hoechst33258荧光染色、透射电镜和WesternBlot方法,观察了β-紫罗兰酮对SGC-7901细胞的生长抑制作用和细胞凋亡诱导情况。结果β-紫罗兰酮对SGC-7901细胞生长和有丝分裂有明显地抑制作用,EC50值为(174.93±12.79)μmol/L;并且可诱导SGC-7901细胞产生凋亡,激活Caspase-3片断和降低ERK1/2蛋白的表达,呈剂量-反应关系。结论β-紫罗兰酮可诱导SGC-7901细胞产生凋亡,不仅作用凋亡途经,而且还影响MAPK途经。

白花蛇舌草提取物体外对人胃癌细胞SGC-7901增殖抑制作用的实验研究

目的探讨白花蛇舌草提取物体外对人胃癌细胞SGC-7901增殖的抑制作用。方法通过体外无菌传代培养人胃癌细胞SGC-7901,将白花蛇舌草提取物以0.05mg/mL、0.1mg/mL、0.15mg/mL、0.2mg/mL四个不同浓度作用于该细胞,24h后采用MTT法检测细胞活性及数量。结果药物组0.05mg/mL和0.1mg/mL浓度孔的吸光值与对照组相比无显著性差异(P>0.05),而0.15mg/mL和0.2mg/mL浓度孔的吸光值明显小于对照组(P<0.05)。结论白花蛇舌草提取物体外对人胃癌细胞SGC-7901增殖有一定的抑制作用,且抑制作用的强弱可能跟药物浓度有关,值得进一步研究。

红花多糖对人胃癌细胞SGC-7901凋亡的形态学实验研究

目的:从形态学角度探讨红花多糖(SPS)诱导人胃癌细胞SGC-7901凋亡的作用。方法:MTT法观察SPS对人胃癌SGC-7901细胞体外增殖的抑制作用。荧光显微镜和透射电镜观察细胞凋亡的形态学变化。Rhodamine 123染色观察SPS处理后细胞线粒体跨膜电位变化。结果:SPS能明显抑制SGC-7901细胞增殖,具有时间和剂量依赖性。显微镜下发现SPS处理后贴壁细胞减少,部分细胞变圆、皱缩、脱落,部分细胞崩解。荧光显微镜下和透射电镜下,SPS作用的细胞呈现典型凋亡细胞状态。胃癌细胞Rhodamine 123荧光强度明显减弱。结论:SPS对人胃癌细胞体外增殖有抑制作用,且具有明显的时间和剂量依赖性。

涤痰化瘀汤对人胃癌SGC-7901细胞生长影响的研究

目的 研究涤痰化瘀汤及其药物血清 (剂量为临床等效量 )对体外培养的人胃癌SGC 790 1细胞株的抑制作用。方法 采用MTT法 ,观察细胞抑制率。结果 涤痰化瘀汤大、中、小剂量组及其药物血清组对人胃癌SGC 790 1细胞的抑制率分别为 78.5 %、41.4%、2 7.8%和 2 3.9%。结论 涤痰化瘀汤及其药物血清对人胃癌SGC 790 1细胞生长均有明显的抑制作用。

川芎嗪对人胃癌细胞株SGC-7901/ADR增殖、凋亡和MDR1、GST-π表达的影响

目的：探讨川芎嗪诱导人胃癌细胞株SGC-7901/ADR凋亡及对MDR1、GST-π表达的调控作用。方法：不同剂量（0~120μM）川芎嗪内酯与人胃癌细胞株SGC-7901/ADR同培养不同时间（24、48及72 h）,50μM 5-氟尿嘧啶（5-FU）作为阳性对照组,采用CCK8法测定细胞的增殖,流式细胞术测定细胞凋亡率。用不同剂量的川芎嗪与细胞培养48 h后,采用Western blot测定MDR1、GST-π蛋白的表达情况,用半定量RT-PCR测定MDR1、GST-πmRNA表达。结果：不同浓度川芎嗪处理人胃癌细胞株SGC-7901,川芎嗪抑制SGC-7901细胞增殖呈浓度及作用时间依赖性且120μM川芎嗪的抑制率与阳性对照组相当;而且应用流式细胞仪检测发现川芎嗪作用于人胃癌细胞株SGC-7901 48 h后,细胞出现凋亡。Western blot及半定量RT-PCR检测细胞中MDR1、GST-π及其mRNA的表达,结果显示,川芎嗪可下调MDR1、GST-π表达,下调作用与TMZ相当甚至更具优势。结论：川芎嗪能够抑制人胃癌细胞株SGC-7901的增殖,诱导其凋亡,且能抑制细胞中MDR1、GST-π的表达,其表达量与川芎嗪剂量呈现明显的时间-浓度效应关系。