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奥曲肽抑制人胃癌细胞株MKN45的生长
目的:研究奥曲肽(octreoticde,OCT)对人胃癌细胞株MKN45生长的调控作用,并探讨其作用机制.方法:采用MTT比色分析法测定OCT 10-2,10-3,10-4,10-5,10-6g.L-1对MKN45细胞生长的调控作用;采用流式细胞术分析OCT 10-3g·L-1对MKN45细胞的周期分布的影响.结果:OCT 10-2,10-3,10-4g·L-1对MKN45细胞的生长均有抑制作用,以10-3g·L-1浓度的抑制作用显著,为10.4%;10-3g·L-1这一浓度可诱导MKN45出现G0/GI阻滞,于加入OCT后6h开始,为(64±4)%,24h显著,达(75±3)%,36h已消失;与对照组(7±1)%相比,24h G2/M期细胞比例亦减少,为(2±2)%,但OCT未改变亚二倍体细胞的比例.结论:OCT可抑制人胃癌细胞株MKN45的生长,其作用机制之一是诱导细胞出现GO/GI阻滞.
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GnRH类似物诱导肝癌细胞凋亡的体外研究
目的:研究GnRH类似物阿拉瑞林诱导体外培养的人肝癌细胞株SMMC-7721发生凋亡的作用,为GnRH类似物用于肝癌的内分泌治疗提供实验资料.方法:采用MTT法、形态学透射电镜观察和末端脱氧核苷酸标记法观察被阿拉瑞林处理后的SMMC-7721细胞的形态学和生化等指标的变化.结果:MTT法研究结果表明阿拉瑞林在10-9 mol/L浓度时即可诱导7721细胞凋亡,并呈量-效效应.透射电镜下可观察到早期凋亡细胞和晚期凋亡细胞以及核染色质浓缩并见凋亡小体.末端脱氧核苷酸转移标记法进一步证实阿拉瑞林可以诱导肝癌细胞凋亡并可见凋亡小体;与对照组相比,阿拉瑞林处理后TUNEL凋亡指数显著增加(0.29±0.06vs0.11±0.03,P<0.05).结论:GnRH类似物可诱导体外培养的肝癌细胞株SMMC-7721发生凋亡,从而提示GnRH类似物对人肝细胞性肝癌具有潜在的治疗作用.
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树突状细胞体内外对肝癌细胞的抑制作用
目的:研究树突状细胞对肝癌等肿瘤细胞的直接作用.方法:用rhGM-CSF和rhIL-4从健康人外周血诱导树突状细胞,用ELISA和MTT法分别检测DC培养上清液中IL-12和TNF水平,用MTT法检测DC对肝癌细胞SMMC-7 721、QGY-7703、HEPG-2、Alexander,胃癌细胞SGC-7901,慢性髓原性白血病细胞K562、Burkitt's淋巴瘤细胞Raji和正常人二倍体细胞的抑制作用,同时用流式细胞术检测DC表面FasL的表达,后用DC进行人肝癌裸鼠皮下抑制瘤的抑制试验.结果:诱导7 d的DC对4种肝癌细胞和胃癌细胞均有不同程度抑制作用,随着效靶比的增加,DC对肝癌细胞和胃癌细胞的抑制作用逐渐增加;DC预防人肝癌裸鼠皮下移植瘤,其抑制率为97%.结论:DC进入机体后也可以非特异性抑制方式发挥抑癌作用,本研究丰富和拓展了肝癌DC疫苗的内容,为今后肝癌DC疫苗的研究奠定了基础.
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肝癌患者树突状细胞融合肝癌细胞体外诱导特异性抗肝癌免疫
目的:探讨肝癌(HCC)患者树突状细胞(DC)融合HCC细胞体外诱导同源T淋巴细胞产生特异性抗HCC免疫的效能.方法:应用人重组粒细胞/巨噬细胞集落刺激因子(rhGM-CSF)和白介素-4(rhIL-4)对肝癌患者外周血单个核细胞进行体外诱导产生树突状细胞,流式细胞仪检测DC表面标志物表达水平,聚乙二醇融合DC与肝癌细胞HepG2,MTT法测定融合细胞(HepG2/DC)刺激同源T淋巴细胞增生、分化能力,细胞毒性试验检测HepG2/DC诱导的细胞毒T淋巴细胞(CTL)对HepG2的特异性杀伤作用.结果:体外培养1 wk后的DC高度表达CDh,HLA-DR,CD54,CD80和CD86,融合细胞HepG2/DC刺激同源T淋巴细胞增值能力显著高于HepG2,HepG2+DC,DC及PBS,A值分别为0.816±0.019,0.541±0.020,0.632±0.018,0.564±0.018,0.345±0.013(P<0.05),HepG2/DC活化的CTL对HepG2具有明显的特异性杀伤作用.结论:HCC患者外周血DC融合HCC细胞可有效诱导同源T淋巴细胞产生特异性抗HCC免疫,可望成为一条HCC免疫治疗的有效途径.
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二烯丙基二硫对人胃癌MGC803细胞生长的影响
目的:研究二烯丙基二硫(DADS)对人胃癌MGC803细胞生长的抑制作用.方法:采用MTT法、生长曲线分析、细胞活力检测、双层软琼脂集落形成率、及倒置显微镜等方法,观察DADS对体外培养的人胃癌MGC803细胞的影响.结果:DADS对MGC803细胞具有明显的生长抑制效应,且呈剂量-效应依赖关系(P<0.05).培养96 h,35 mg/LDADS的抑制作用呈时间-效应依赖关系(P<0.05).细胞群体倍增时间由33.8 h延长至DADS处理后的84.0 h(P<0.05);细胞存活率分别为阴性对照组97.4%和DADS处理组80.4%(P>0.05);软琼脂集落形成率由1.23%下降到0.33%(P<0.05).阴性对照组细胞多角形、圆形,体积大,多形性明显,核大小不一,见双核及核仁,细胞生长紧密呈堆叠生长.DADS处理后细胞异型性降低,为形态一致的梭形,体积小,境界清楚而分散,胞质丰富,核明显变小.结论:DADS对体外培养的MGC803细胞具有明显的增生抑制作用,且呈现剂量-效应依赖关系.
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塞莱西布体外对人类肝胃癌细胞生长的抑制作用
目的:研究塞莱西布在体外对人类肝癌7721细胞以及胃癌7901细胞的生长抑制作用.方法:两种肿瘤细胞用含不同浓度(0,20,40,80,160和320 pmol/L)的塞莱西布的培养液培养.应用MTT测定法来测定生长抑制率,电镜技术来观察细胞凋亡情况,免疫组化技术来检测细胞内Cox-2蛋白含量.结果:塞莱西布对两种肿瘤细胞均具有生长抑制作用(塞莱西布320 pmol/L时两种肿瘤细胞抑制率分别为49.1%和42.9%),并呈现量-效关系.电镜下可观察到凋亡细胞.免疫组化发现细胞内环氧化酶的含量在处理前后有明显变化.结论:在体外,塞莱西布抑制人类肝癌及胃癌细胞生长,诱导他们产生凋亡,并且该作用与细胞内环氧化酶含量有密切关系.
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幽门螺杆菌对体外原代培养的人胆囊上皮细胞损伤作用
目的:探讨幽门螺杆菌(Hpylori)在体外对人胆囊上皮细胞(HGBEC)的损伤作用.方法:采用液体增菌及人胆囊上皮细胞原代培养研究Hpylori对HGBEC的损伤作用.结果:从Hpylori的生长曲线可知观察其他因素对HGBEC的影响在细胞生长旺盛期即培养的2-6 d为合适,Hpylori增菌上清液及菌体破碎液对培养的HGBEC形态学及上清酶学指标ALP(33.84±6.00 vs 27.01±4.67,P<0.05),LDH(168.37±20.84 vs 55.51±17.17,P<0.01),GGT(42.01±6.18 vs 25.34±4.33 P<0.01)有明显影响.结论:Hpylori增菌上清液及菌体破碎液对培养的HGBEC有明显损伤作用.
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幽门螺杆菌细胞毒素促进胃黏膜分泌白介素8作用
目的:探讨细胞因子在幽门螺杆菌(H. Pylonri)免疫病理机制中的作用.方法:48例患者(慢性浅表性胃炎37例,十二指肠溃疡(DU)11例,其中男性31例,年龄21-63岁)胃镜诊断明确后取胃窦及胃体活检,用于H. Pylori诊断及体外组织培养.H. Pylori诊断采用快速尿素酶试验、H. Pylori培养及Warthin-Starry银染色,3项检查中任2项结果阳性诊断为H. Pylori阳性.3块胃窦活检组织各加1mL RPMI1640,50mL -1CO2和37℃培养24h,ELISA法测上清中白介素(IL)-6,IL-8及肿瘤坏死因子(TNF)-α;Lowry改良法测活检组织蛋白含量.另8例RPMI 1640中加入H.pylori细胞空泡毒素(VacA).结果以每克蛋白中ng(ng g-1)或mg(μg g-1)表示.结果:H. Pylori阳性率69%.H.pylori阳性者胃黏膜培养上清中IL-6,IL-8和TNF-α含量均显著高于H. Pylori阴性者,其中9例DU患者的IL-8含量为53(18-96)μg g-1,显著高于慢性胃炎者的36(7-84)μg g-1(P<0.01).培养液加入VacA后,IL-8的分泌量明显增高(50±38μg g-1vs 68±30μg g-1,P<0.01).TNF-α的含量虽升高,但无显著差别,对IL--6的含量无影响.IL-8的含量与炎症程度及活动性显著相关(r=0.98,P<0.0025),IL-6和TNF-α的含量与炎症程度无明显关系(r=-0.26和-0.28,P>0.25),但活动性炎时高于非活动性炎者.结论:结果提示IL-8与炎细胞浸润密切相关,H. Pylori细胞毒素对黏膜细胞因子的分泌有促进作用.
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AIM To study the effect of a wide range of concentration of arsenic trioxide on human hepatoma cell lineBEL-7402 and its mechanism.METHODS The BEL-7402 cells were treated with arsenic trioxide (a final concentration of 0.5, 1 and2 μmol/L, respectively) in various durations or for 4 successive days. The cell growth and proliferation wereobserved by cell counting and cell-growth curve. Morphologic changes were studied under electronmicroscopy. Flow cytometry was used to assay cell-DNA distribution and the protein expression of Bcl-2 andBax was detected by immunocytochemical method.RESULTS The cell growth was significantly inhibited by the different concentrations of arsenic trioxide asrevealed by cell counting and cell-growth curve. Arsenic trioxide treatment at 0.5, 1 and 2 μmol/L, resultedin a sub-G1 cell peak. The decreased G0/G1 phase cell and the increased percentage of S phase cell were observed by flow cytometer, suggesting that the inhibiting effect of arsernic trioxide on BEL-7402 cell lay inG0/G1 phase cell. Apoptotis-related morphology, such as intact cell membrane, nucleic condensation,apoptotic body formation, can be seen under the electron microscopy. High protein expression level of Bcl-2and Bax was detected in 1 and 2 μmol/L arsenic trioxide-treated cells, but that of Bax was more significant.Arsenic trioxide treatment at 0.5 μmol/L resulted in higher expression level of Bcl-2 and lower expressionlevel of Bax compared with control (P1<0.01, P2<0.01).CONCLUSION Arsenic trioxide not only inhibited the proliferation but also induced apoptosis of humanhepatoma cell line BEL-7402. The induced-apoptosis effect of 1 and 2 μmol/L arsenic trioxide was relative tothe expression level of Bcl-2 and Bax.
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AIM To determine the role of Helicobacter pylori in altering gastric mucin synthesis and define how thprocess relates to H. pylori-related diseases.METHODS Analyses of human gastric tissues using immunohistochemistry and in situ hybridizatiodocument the role of H. pylori in altering the composition and distribution of gastric mucins.RESULTS These data indicate a decrease in the product of the MUC5 (MUC5AC) gene and aberraexpression of MUC6 in the surface epithelium of H. pylori-infected patients. A normal pattern was restorby H. pylori eradication. Inhibition of mucin synthesis including MUC5AC and MUCl mucins by H. pvlohas been established in vitro using biochemical and Western blot analyses. This effect is not due to inhibitiof glycosylation, but results from inhibition of synthesis of mucin core structures. In vitro experiments usiinhibitors of mucin synthesis indicate that cell surface mucins decrease adhesion of H. pylori to gastepithelial cells.CONCLUSION Inhibition of mucin synthesis by H. pylori in vivo can disrupt the protective mucous layand facilitate bacterial adhesion, which may lead to increased inflammation in thc gastric epithelium.
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AIM To investigate the effects of taxol on SMMC-7721 human hepatoma and its mechanisms. MLETHODS In vitro cell growth was assessed by trypan blue exclusion method. Experimental hepatoma model was established by seeding SMMC-7721 cells subcutaneously into Balb/c (nu/nu) nude mice. In vivo tumor growth was determined by measurement of tumor diameter with Vernier calipers. The syntheses of DNA,RNA and protein were analyzed by incorporation of 3H-thymidine, 3H-uridine and 3H-leucine respectively. Using light and electron microscopes to observe the morphological changes of cells including mitosis and apoptosis.RESULTS Taxol was effective against SMMC 7721 human hepetoma cell growth in the ranges of 2.5 nmol/L - 10 nmol/L with mitotic arrest and apoptosis in vitro. DNA, RNA and protein syntheses in cells were also obviously suppressed by in vitro treatment of taxol for 72 h. Taxol at 2.5 nmol/L reduced 3H-thymidine uptake to about 34% of the control value (P<0.05). Increasing the dose of taxol to 20 nmol/L resulted in a greater decrease in 3Hthymidine incorporation to 60% of the control value (P<0.01). At a concentration of 20 nmol/L, the 3H-uridine and 3H-leucine uptakes were reduced to 52% (P<0.05) and 63%(P<0.01), respectively. In vivo, taxol significantly inhibited SMMC-7721 tumor growth at 10 mg/kg, i.p., once daily for 10 d. A more than 90% decrease in tumor volume was observed by day 11 (P<0.01) similarly with mitotic arrest and cell apoptosis.CONCLUSION Taxol has a marked anticancer activity in SMMC-7721 human hepatoma both in vitro and in nude mice. Its mechanisms might be associated with mitotic arrest, subsequently,apoptosis of the hepatoma cells. No obvious toxicity was observed with in vivo administration of taxol.
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血管紧张素Ⅱ2型受体基因转染表达促进血管平滑肌细胞凋亡
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雌二醇对人成骨细胞增殖及基质金属蛋白酶活性的影响
本文报道了雌二醇对体外分离培养的人成骨细胞增殖的影响,SDS-Gel-PAGE电泳及固体胶原-羟脯氨酸测定法测定成骨细胞基质金属蛋白酶(MMPs)活性.结果表明:低浓度雌二醇对人成骨细胞有刺激增殖的作用,1.3×10-7M时刺激作用强,浓度过高则抑制细胞增殖,成骨细胞的分化则随着雌二醇浓度的增加而分化越好,随雌激素浓度增加成骨细胞MMP活性也相应增大与分化程度一致.
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小分子肽抑制破骨细胞附着和迁移
近在Journal of Molecular Signaling发表的题为"Dramatic inhibition of osteoclast sealing ring formation and bone resorption in vitro by a WASP-peptide containing pTyr294 amino acid"的文章提出了治疗骨质疏松的新的靶点.
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过敏性紫癜患儿外周血树突状细胞功能变化及黄芪体外干预研究
过敏性紫癜(HSP)为常见变态反应性血管炎性疾病,其发病与T、B细胞功能紊乱关系密切[1].迄今有关HSP患儿树突状细胞(DG)功能变化的研究资料较少,有报道黄芪(AM)可以纠正HSP患儿辅助性T淋巴细胞(Th)亚群失衡[2],但目前尚无AM在DC水平对HSP患儿免疫功能调节的资料报道.本研究对HSP患儿外周血DC表面共刺激分子CD80(B7-1)、CD86(B7-2)的表达和DC分泌白细胞介素(IL)-10、IL-12、IL-18水平进行检测,同时观察AM的干预效果.
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复方丹参注射液诱导鼠骨髓间充质干细胞向神经样细胞分化的研究
骨髓间充质干细胞(bone mesenchymal stem cells, BMSCs)移植治疗新生儿缺氧缺血性脑病(HIE)是近年来研究的新方法,但目前发现BMSCs 移植后神经性分化率仅约10%左右[1].
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Jadomycin B, an Aurora-B kinase inhibitor discovered through virtual screening
Aurora kinases are clearly implicated in tumorgenesis and have emerged as promising targets for cancer therapy in recent years. In a virtual screening attempt, 22 compounds were identified from nearly 15,000 microbial natural products as potential small-molecule inhibitors of human Aurora-B kinase. When tested in yeast models, 2 compounds (one is Jadomycin B) showed preferential inhibition of ipll-321 (yeast Aurora kinase temperature sensitive mutant) than wild type yeast cell, suggesting these compounds are true Aurora kinase inhibitors. Further in vitro biochemical assay using purified recombinant Aurora-B kinase showed Jadomycin B inhibits Aurora-B activity in a dose-dependent fashion while two Jadomycin congeners, Jadomycin S and T, showed no activity.
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Objective: To detect the effect of arsenic trioxide or ATRA on APL cells or HL-60 cells and to investigate the mechanism of the hyperleukocytosis and detect the cross resistance between ATRA and arsenic trioxide. Methods: The number of promyelocytes or more matured granulocytes were counted by regular method, MTT test was used to measure the proliferation of HL-60 cells or APL cells, flow cytometry analysis to measure the apoptosis, NBT method to detect the differentiation of HL-60 cells or APL cells. Results: The proliferation of primary APL cells or HL-60 cells could be inhibited in vitro by either arsenic trioxide or ATRA, which could induce obvious apoptosis or obvious differentiation of primary APL cells or HL-60 cells. Inhibition of proliferation or apoptosis of ATRA resistant HL-60 cells were achieved by exposure toarsenic trioxide in vitro. On the other hand, the results of in vivo treatment showed that arsenic trioxide also induce of hyperleukocytosis. Conclusion: The results indicated that the hyperleukocytosis induced by ATRA is not contributed to the mechanism of more differentiation than apoptosis, there was not cross resistance between ATRA and arsenic trioxide.
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The electrophysiological properties of potassium ion channels are regarded as a basic index for determining the functional differentiation of neural stem cells. In this study, neural stem cells from the hippocampus of newborn rats were induced to differentiate with neurotrophic growth factor, and the electrophysiological properties of the voltage-gated potassium ion channels were observed. Immunofluorescence staining showed that the rapidly proliferating neural stem cells formed spheres in vitro that expressed high levels of nestin. The differentiated neurons were shown to express neuron-specific enolase. Flow cytometric analysis revealed that the neural stem cells were actively dividing and the percentage of cells in the S + G2/M phase was high. However, the ratio of cells in the S + G2/M phase decreased obviously as differentiation proceeded. Whole-cellpatch-clamp re-cordings revealed apparent changes in potassium ion currents as the neurons differentiated. The potassium ion currents consisted of one transient outward potassium ion current and one delayed rectifier potassium ion current, which were blocked by 4-aminopyridine and tetraethylammonium, respectively. The experimental findings indicate that neural stem cells from newborn rat hippo-campus could be cultured and induced to differentiate into functional neurons under defined condi-tions in vitro. The differentiated neurons expressed two types of outward potassium ion currents similar to those of mature neurons in vivo.
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冬凌草甲素对人鼻咽癌细胞株CNE-2细胞增殖的抑制作用
鼻咽癌是我国头颈部常见的恶性肿瘤之一,病理类型以低分化鳞状细胞癌多见,临床上以放疗为主,晚期患者辅以化疗.与传统的化疗药物相比,天然抗肿瘤药物日益受到人们的关注.冬凌草甲素是从冬凌草中提取出来的有效抗癌成分,其主要化学结构是一种四环二萜类化合物,有研究表明对食管癌、肝癌、结肠癌以及白血病等有一定的疗效[1-9].本研究通过体外实验探讨冬凌草甲素对人鼻咽癌细胞株CNE-2细胞生长是否具有抑制作用,以期为临床应用提供理论依据.