骨髓间充质干细胞共培养对肝星状细胞增殖、凋亡和RohA表达的调控

目的:观察体外大鼠骨髓间充质干细胞(BMSCs)共培养对肝星状细胞(HSCs)增殖、凋亡和RohA表达的影响,探讨BMSCs旁分泌HGF在其中的作用机制.方法:贴壁筛选法培养、纯化SD大鼠BMSCs,传代至第4代使用;大鼠肝星状细胞(HSC-T6)系及纤维原细胞系冻融后传代使用.应用6孔塑料细胞培养盒,每孔使用半透膜(transwell insert)建立上下双层细胞共培养体系,常规培养.实验分4组:空白对照组、阴性对照组、BMSCs实验组、预处理实验组(c-met多克隆抗体预处理).用四甲基偶氮唑蓝(MTT)法检测HSCs细胞增殖能力;流式细胞仪检测细胞凋亡;RT-PGR、Western blot检测BMSCs与HSCs共培养后HSCs内RohA mRNA和蛋白的表达.酶联免疫吸附法(ELISA)检测BMSCs与HSCs共培养上清液中肝细胞生长因子(HGF)浓度.结果:BMSCs对HSCs增殖具有抑制作用,BMSCs与HSCs共培养后24 h、48 h的增殖抑制率分别为12.21%,35.43%,与空白对照组、实验对照组和C-met抗体预处理组比较有显著性差异(P<0.01).Annexin-V-FITC/PI双染法检测BMSCs与HSCs共培养48 h后HSCs的凋亡率为25.80%,与空白对照组、实验对照组与c-met抗体预处理组比较有显著性差异(P<0.01).BMSCs与HSCs共培养48 h,BMSGs组RohA mRNA的表达抑制明显,且显著低于空白对照组、实验对照组与C-met抗体预处理组,有显著性差异(P<0.01).BMSCs与HSCs共培养48 h RohA蛋白的表达明显抑制,且显著低于空白对照组、实验对照组与C-met抗体预处理组,有显著性差异(P<0.01).ELISA检测BMSCs与HSCs共培养24 h、48 h上清液中HGF浓度分别为250 ng/L与570 ng/L,明显高于单独BMSCs培养和单独HSCs培养,有显著性差异(P<0.01).结论:BMSCs与HSCs共培养能抑制HSCs的增殖,促进凋亡,抑制RohA表达,其机制可能是通过BMSCs旁分泌HGF发挥抑制大鼠HSCs增殖,促进凋亡的作用.     

肿瘤坏死因子-α刺激骨髓间充质干细胞后对肝星状细胞凋亡的促进作用

目的:观察肿瘤坏死因子-α(tumor necrosisfactor-α,TNF-α)刺激大鼠骨髓间充质干细胞(bone marrow mesenchymal stem cells,BMSCs)情况下,共培养体系中BMSCs对大鼠肝星状细胞(hepatic stellate cells,HSCs)凋亡的影响并探讨其机制.方法:全骨髓贴壁法分离、纯化S D大鼠BMSCs,传至第3-4代使用.运用6孔Transwell板建立共培养体系,将TNF-α刺激BMSCs后与HSCs共培养.实验分HSCs空白对照组、BMSCs空白对照组、正常共培养组、刺激共培养组;采用流式细胞术检测HSCs凋亡,RT-PCR、Western blot分别检测RhoA与HGFmRNA及蛋白表达,ELISA测定细胞培养上清液中HGF含量.结果:刺激共培养组24h、48h HSCs RhoA蛋白(24h:0.864±0.006,48h:0.688±0.013)及mRNA(24h:0.809±0.004,48h:0.494±0.010)表达进行性下降,与正常共培养组和HSCs空白对照组比较有显著性差异(P<0.01),BMSCsHGF蛋白(24h:1.032±0.003,48h:1.060±0.003)及mRNA(24h:0.857±0.004,48h:1.195±0.010)表达呈时间依赖性递增,与正常共培养组比较差异有统计学意义(P<0.05);刺激共培养组24h、48h HSCs凋亡率分别为6.583%±0.091%、29.960%±0.223%,与正常共培养组(24h:4.700%±0.168%,48h:23.140%±0.115%)比较差异有统计学意义(P<0.01).结论:TNF-α刺激BMSCs后与HSCs共培养明显促进HSCs凋亡,其机制可能是BMSCs通过旁分泌HGF抑制HSCs RhoA表达实现的.     

siRNA抑制PTTG表达对人结肠癌LoVo细胞增殖、凋亡及细胞周期的影响

目的 探讨siRNA抑制人垂体瘤转化基因PTTG表达对人结肠癌LoVo细胞增殖、凋亡及细胞周期的影响.方法 LoVo细胞分为3组:正常细胞对照组、Lipo2000+ pGenesil-2.1 HK组(HK阴性对照组)、Lipo2000+ pGenesil-2.1-PTTG siRNA组.应用Western印迹法检测转染48 h后各组细胞PTTG蛋白表达,MTT法检测转染24、48和72 h后各组细胞增殖情况,流式细胞术检测转染48 h后各组LoVo细胞凋亡和细胞周期情况.结果 pGenesil-2.1-PTTG siRNA质粒转染LoVo细胞后PTTG蛋白表达明显低于正常和HK阴性对照组.MTT比色分析法显示,pGenesil-2.1-PTTGsiRNA质粒转染LoVo细胞后,在24、48和72 h细胞增殖能力均显著低于正常对照组和阴性对照HK组(均P＜0.05).流式细胞术检测结果显示,与对照组相比,转染pGenesil-2.1 PTTG siRNA质粒后LoVo细胞Go/G1期细胞百分率均高于正常和阴性HK对照组(均P＜0.01),而S期细胞百分率均低于正常和阴性HK对照组(均P＜0.01);Annexin V-PI双染结果显示,转染pGenesil-2.1 PTTG siRNA质粒后LoVo细胞凋亡百分率高于正常和阴性HK对照组(均P＜0.01).结论 pGenesil-2.1-PTTG siRNA质粒可明显抑制LoVo细胞PTTG蛋白表达,并进而抑制LoVo细胞增殖,促进其凋亡,使细胞阻滞于G0/G1期.     

肝细胞生长因子的激活诱导肝星状细胞凋亡

目的 探讨大鼠骨髓间充质干细胞(BMSCs)与肝星状细胞(HSCs)共培养体系中肝细胞生长因子激活因子(HGFA)激活肝细胞生长因子(HGF)后对HSCs凋亡的影响.方法 用半透膜建立上下双层细胞共培养体系,各组培养24h、48 h及72h后,倒置相差显微镜观察细胞形态学变化；流式细胞仪检测BMSCs表面抗原及HSCs凋亡率；四甲基偶氮唑盐法检测HSCs增殖率；免疫组织化学法检测HSCs中α-平滑肌肌动蛋白表达；免疫荧光及组织化学染色法检测HGF的激活形式(即HGF-α链)；酶联免疫吸附法检测HGF及HGFA浓度.计量资料采用单因素方差分析,组间均数的比较采用q检验. 结果 不同浓度HGF在各时段对HSCs无增殖抑制作用(P＞0.05),差异无统计学意义;HGFA在各时段对HSCs有明显增殖抑制作用,且呈浓度依赖性,在24h HGFA浓度为70 ng/ml时抑制作用为(0.26±0.00),较对照组的(0.13±0.04),明显增加,差异有统计学意义(P＜0.05);72h实验组HGF-α链相对表达量37.24±1.03低于HGFA干预组的40.44±0.77,差异有统计学意义(P＜ 0.05)；两者在各时段与对照组比较,差异均有统计学意义(P＜ 0.01).实验组HSCs凋亡率在72h为40.77％±1.16％,均较HGFA干预组的33.35％±2.04高,差异有统计学意义(P＜ 0.05)；两者在各时段与对照组比较,差异有统计学意义(P＜0.05).实验组及HGFA干预组中HGF浓度的降低呈时间依赖性,较HSCs空白对照组低；实验组HGFA的浓度在各时段均较对照组高.结论 BMSCs与HSCs共培养后促进HGFA的分泌,并激活HGF使其发挥促HSCs凋亡的作用.     

RNA干扰DNMT1基因对胰腺癌细胞BxPC-3增殖的影响及相关机制

目的:探讨RNA干扰DNMT1基因对胰腺癌细胞BxPC-3增殖的影响及相关机制.方法:利用Lipofectamine TM2000转染DNMT1-siRNA至胰腺癌细胞BxPC-3.实验共分为3组:实验组(转染DNMT1-siRNA)、阴性对照组(转染negative-siRNA)和空白对照组(转染脂质体).转染48h后,应用荧光定量PCR法和Western blot法分别检测细胞中DNMT1 mRNA和蛋白的表达水平;MTT法检测细胞体外增殖活力;FCM法检测细胞凋亡;甲基化特异性PCR法(MSP)检测抑癌基因p16、RASSF1A和ppENK的启动子甲基化状态.结果:与空白对照组和阴性对照组相比,实验组的DNMT1 mRNA及蛋白表达量均显著降低(P<0.01);实验组细胞增殖明显受到抑制(P<0.05),细胞凋亡率明显增加(44.46%±5.98%vs3.74%±1.02%vs5.07%±1.16%,P<0.01).空白对照组与阴性对照组的p16、RASSF1A和ppENK基因甲基化阳性,而实验组的p16和ppENK基因甲基化阴性,RASSF1A基因部分甲基化.结论:DNMT1基因表达下调后,能抑制胰腺...     

LOXL2基因沉默对人胃癌细胞株BGC823增殖的影响及其机制

目的观察赖氨酰氧化酶样蛋白2(LOXL2)基因沉默后人胃癌细胞株BGC823增殖情况变化,并探讨其相关机制。方法培养并收集人胃癌细胞株BGC823、正常胃上皮细胞株GES-1,采用real-time PCR检测LOXL2 mRNA,Western blotting法检测LOXL2蛋白。将BGC823细胞分为实验组、阴性组、对照组,其中实验组、阴性组分别转染LOXL2 siRNA、NS siRNA,对照组仅加入Lipofectamine2000试剂。继续培养48 h后,采用MTT实验观察细胞增殖抑制情况,流式细胞术观察细胞周期分布,采用real-time PCR检测增殖细胞核抗原(PCNA)、细胞周期素D1(Cyclin D1)mRNA,采用Western blotting法检测PCNA、Cyclin D1蛋白。结果 BGC823细胞中LOXL2 mRNA及蛋白相对表达量均高于GES-1细胞(P均<0.05)。与对照组相比,实验组、阴性组细胞增殖抑制率分别为48.32%±3.91%、8.86%±2.98%。实验组G0/G1期细胞百分比高于阴性组与对照组,S期细胞百分比低于阴性组与对照组(P均<0.05)。实验组细胞中PCNA、Cyclin D1 mRNA及蛋白相对表达量均低于阴性组和对照组(P均<0.05)。结论 LOXL2基因沉默后,BGC823细胞增殖受到抑制,其机制可能与下调PCNA、Cyclin D1 mRNA及蛋白表达有关。     

沉默FABP-5基因对人肝癌HepG2细胞的影响

目的:研究RNA干扰技术的重组慢病毒载体沉默人肝癌Hep G2细胞中表皮脂肪酸结合蛋白-5(fatty acid binding protein-5,FABP-5)基因对其增殖、凋亡和侵袭力的影响及作用机制.方法:构建3个靶向FABP-5基因sh RNA载体,并筛选出最有效的靶点.将Hep G2细胞分为3组:实验组用FABP-5基因沉默重组慢病毒颗粒(LV-sh RNA-FABP-5)感染HepG2细胞;阴性对照组用空载慢病毒颗粒(LV-sh RNANC组)感染Hep G2;空白对照组正常培养.应用RT-PCR、实时荧光定量PCR检测FABP-5基因m RNA的表达;Western blot技术检测各组细胞FABP-5蛋白的相对表达;MTT法测定细胞体外增殖能力;Giemsa染色法检测细胞的克隆形成;细胞侵袭小室法检测各组细胞的体外侵袭力;流式细胞技术(flow cytometry,FCM)检测各组细胞增殖和凋亡的变化情况.结果:通过测序验证构建的FABP-5-shRNA表达载体,感染人肝癌HepG2细胞,荧光显微镜观察到细胞感染率90%.Real-time PCR和Western blot结果得出:相比空白对照组和阴性对照组,实验组的3种靶点FABP-5-sh RNA干扰序列中,LV-sh RNA-FABP-5(1)靶点中FABP-5表达的敲减率最高(P0.05),筛选出此组为最佳靶点;MTT法结果提示:实验组细胞490 n m处的吸光度(A)值在转染后第1-5天时均低于阴性对照组、空白对照组,差别有统计学意义(P0.05).Giemsa染色法结果显示:稳定转染Hep G2细胞后细胞的增殖能力明显下降(P0.05);细胞侵袭小室实验显示:与空白对照和阴性对照组相比,实验组细胞的侵袭力明显受到抑制(P0.05);流式细胞技术检测发现实验组的细胞相对于阴性对照组出现了明显的凋亡(P0.05).实验组较阴性对照组、空白对照组G2/M期延长,G1期缩短,差别具有统计学意义(P0.05).结论:人肝癌Hep G2细胞中沉默FABP-5基因可以有效抑制其表达,能够降低肝癌细胞的侵袭力,抑制肝癌细胞的增殖,将细胞周期阻滞于G2/M期,使其凋亡显著增加.     

外源性骨形态发生蛋白9转入肺鳞癌细胞对其活性的影响及作用机制

目的观察骨形态发生蛋白(BMP)9对人肺鳞癌细胞株YTMLC-90迁移和侵袭能力的影响及其作用机制。方法 RT-PCR和Western印迹法检测YTMLC-90细胞和正常人支气管上皮细胞(NHBE)中BMP9 mRNA和蛋白表达水平;以转染重组腺病毒Ad-BMP9的YTMLC-90细胞为研究组,转染Ad-GFP为阴性对照组,未转染为空白对照组;采用划痕愈合实验检测3组细胞迁移能力,Transwell实验检测迁移和侵袭能力,同时检测迁移相关因子基质金属蛋白酶(MMP)2 mRNA和蛋白表达情况;Western印迹法检测3组细胞BMP-Smad信号通路中Smad 1/5磷酸化水平。结果YTMLC-90细胞中BMP9 mRNA和蛋白表达量均明显低于NHBE细胞(P<0.05)。Ad-BMP9转染YTMLC-90细胞后胞内BMP9蛋白表达量明显高于阴性对照组(P<0.01)。空白对照组48 h的细胞划痕愈合率与阴性对照组比较差异无统计学意义(P>0.05);研究组细胞划痕愈合率明显低于阴性对照组和空白对照组,穿过小室膜和基质胶的YTMLC-90细胞数均明显少于阴性对照组和空白对照组,MMP2表达量明显低于阴性对照组,MMP2mRNA和蛋白表达量均明显低于阴性对照组(均P<0.05)。YTMLC-90细胞高表达BMP9后其p-Smad 1/5表达量明显高于阴性对照组和空白对照组(P<0.01)。结论外源性BMP9转入人肺鳞癌细胞株YTMLC-90可有效抑制其迁移和侵袭能力,激活BMP-Smad信号通路是该抑制作用的机制之一。     

HSP90α的表达对食管癌细胞侵袭转移能力的影响

目的:探讨热休克蛋白90α(heat shock protein 90α,HSP90α)在食管癌(esophageal carcinoma,EC)细胞侵袭转移中的作用机制.方法:分别采用RT-PCR和Western blot检测HSP90α在具有不同侵袭转移潜能的EC细胞株CE81T-0和CE81T-4中mRNA水平和蛋白质水平的表达差异;细胞转染技术将siRNA-HSP90α转染入CE81T-4细胞中,并分为实验组、阴性对照组、空白对照组;并用RT-PCR和Western blot检测3组细胞中HSP90αmRNA水平和蛋白质水平的表达差异,验证是否转染成功.MTT法检测3组细胞的增殖活力,流式细胞术分析细胞周期、凋亡的改变,划痕实验和Transwell体外侵袭实验检测转染后CE81T-4细胞迁移和侵袭的变化.结果:CE81T-4细胞中的HSP90α的mRNA和蛋白质表达水平明显高于CE81T-0细胞(P0.05);siRNA-HSP90α成功转染CE81T-4细胞后,RT-PCR和Western blot检测3组结果显示,实验组中HSP90αmRNA水平和蛋白水平表达量显著低于空白对照组和阴性对照组(P0.05);MTT实验结果显示,实验组细胞的增殖能力明显减弱,与其他两组比较差异具有统计学意义(P0.05);HSP90α基因表达沉默后,细胞凋亡率为32.67%,较空白对照组和阴性对照组明显增加(P0.05);实验组细胞周期被阻滞在G0/G1期;Transwell体外侵袭实验显示实验组侵袭迁移的细胞数显著低于空白照组与阴性对照组(P0.05);划痕实验结果显示,72 h后实验组细胞的迁移力较其他两组明显降低.结论:HSP90α的下调会降低EC细胞的转移侵袭能力.     

27nt-miRNA通过靶向哺乳动物雷帕霉素靶蛋白调控血管平滑肌细胞凋亡及其分子机制研究

目的:探讨来源于一氧化氮合酶基因第四内含子的27碱基重复序列微小RNA(27nt-miRNA)对哺乳动物雷帕霉素靶蛋白(mTOR)介导的主动脉血管平滑肌细胞(VSMC)凋亡调控作用及潜在分子机制。方法:将大鼠主动脉VSMC分为空白对照组、雷帕霉素组、27nt-miRNA组、27nt-miRNA反义序列(anti-27ntmiRNA)组、阴性对照组。27nt-miRNA组:转染27nt-miRNA正义链慢病毒载体;anti-27nt-miRNA组:转染27ntmiRNA反义链慢病毒载体;阴性对照组:转染随机阴性序列慢病毒载体。除空白对照组外,雷帕霉素组与各转染组细胞给予100 ng/ml雷帕霉素诱导培养2 h诱导凋亡。荧光定量逆转录PCR(qRT-PCR)验证27nt-miRNA慢病毒稳转细胞株构建情况;CCK-8法、流式细胞术、qRT-PCR法与蛋白免疫印迹(Western blot)法分别检测各组细胞增殖能力、细胞凋亡率与周期分布以及mTOR、磷酸化-mTOR(p-mTOR)、B淋巴细胞瘤-2(Bcl-2)、Bcl-2相关X蛋白(Bax)和半胱氨酸天冬氨酸蛋白酶-3(caspase-3)的信使RNA(mRNA)和(或)蛋白表达水平。结果:慢病毒转染VSMC后,27nt-miRNA稳转细胞株构建成功,雷帕霉素可抑制VSMC的mTOR mRNA与p-mTOR蛋白表达水平。与阴性对照组相比,27nt-miRNA组细胞的活力与增殖能力显著增强,且细胞凋亡率显著降低(P均<0.05),细胞周期G1期向S期分裂进程阻滞减弱(P<0.05);Bax和caspase-3蛋白表达量显著减少,Bcl-2蛋白表达量显著增加(P均<0.05);mTOR基因转录水平与p-mTOR蛋白表达水平均下降(P<0.05)。结论:27nt-miRNA通过负调控m TOR基因转录水平与蛋白磷酸化水平抑制VSMC凋亡,其机制可能与上调Bcl-2蛋白表达,下调Bax和caspase-3蛋白表达有关。     

Glucose-responsive insulin-producing cells from stem cells

Recent success with immunosuppression following islet cell transplantation offers hope that a cell transplantation treatment for type 1 (juvenile) diabetes may be possible if sufficient quantities of safe and effective cells can be produced. For the treatment of type 1 diabetes, the two therapeutically essential functions are the ability to monitor blood glucose levels and the production of corresponding and sufficient levels of mature insulin to maintain glycemic control. Stem cells can replicate themselves and produce cells that take on more specialized functions. If a source of stem cells capable of yielding glucose-responsive insulin-producing (GRIP) cells can be identified, then transplantation-based treatment for type 1 diabetes may become widely available. Currently, stem cells from embryonic and adult sources are being investigated for their ability to proliferate and differentiate into cells with GRIP function. Human embryonic pluripotent stem cells, commonly referred to as embryonic stem (ES) cells and embryonic germ (EG) cells, have received significant attention owing to their broad capacity to differentiate and ability to proliferate well in culture. Their application to diabetes research is of particular promise, as it has been demonstrated that mouse ES cells are capable of producing cells able to normalize glucose levels of diabetic mice, and human ES cells can differentiate into cells capable of insulin production. Cells with GRIP function have also been derived from stem cells residing in adult organisms, here referred to as endogenous stem cell sources. Independent of source, stem cells capable of producing cells with GRIP function may provide a widely available cell transplantation treatment for type 1 diabetes.     

Insulin expressing cells from differentiated embryonic stem cells are not beta cells

Aim/hypothesis Embryonic stem (ES) cells have been proposed as a potential source of tissue for transplantation for the treatment of Type 1 diabetes. However, studies showing differentiation of beta cells from ES cells are controversial. The aim of this study was to characterise the insulin-expressing cells differentiated in vitro from ES cells and to assess their suitability for the treatment of diabetes.Methods ES cell-derived insulin-expressing cells were characterised by means of immunocytochemistry, RT-PCR and functional analyses. Activation of the Insulin I promoter during ES-cell differentiation was assessed in ES-cell lines transfected with a reporter gene. ES cell-derived cultures were transplanted into STZ-treated SCID-beige mice and blood glucose concentrations of diabetic mice were monitored for 3 weeks.Results Insulin-stained cells differentiated from ES cells were devoid of typical beta-cell granules, rarely showed immunoreactivity for C-peptide and were mostly apoptotic. The main producers of proinsulin/insulin in these cultures were neurons and neuronal precursors and a reporter gene under the control of the insulin I promoter was activated in cells with a neuronal phenotype. Insulin was released into the incubation medium but the secretion was not glucose-dependent. When the cultures were transplanted in diabetic mice they formed teratomas and did not reverse the hyperglycaemic state.Conclusions/Interpretation Our studies show that insulin-positive cells in vitro-differentiated from ES cells are not beta cells and suggest that alternative protocols, based on enrichment of ES cell-derived cultures with cells of the endodermal lineage, should be developed to generate true beta cells for the treatment of diabetes.Abbreviations ES Embryonic stem - LIF leukemia inhibitory factor - ITSF insulin-transferrin-selenite-fibronectin.Bleackley and Korbutt laboratories contributed equally to this paper     

DC与CIK或LAK联合对结肠癌细胞株SW480杀伤作用的研究

[目的]研究树突状细胞(DC)联合细胞因子诱导或未诱导的杀伤细胞(CIK)或淋巴因子激活的杀伤细胞(LAK)对结肠癌细胞株SW480的杀伤活性.提供DC联合CIK或LAK治疗结肠癌的实验依据.[方法]取人外周血分离出单个核细胞(PBMNC),诱导生成DC、CIK、LAK细胞;流式细胞仪检测DC经SW480肿瘤抗原冲击后的表型变化;以CIK+DC细胞、CIK细胞、LAK+DC细胞及LAK细胞作为效应细胞,SW480为靶细胞,以15∶1、30∶1、45∶1为效靶比,LDH释放法测定细胞杀伤试验活性;ELISA检测杀伤试验中干扰素γ(IFN-γ)、白细胞介素2(IL-2)、IL-12、IL-17的分泌水平.[结果]流式细胞仪检测DC经SW480肿瘤抗原冲击后,其表面分子HLA-DR、CD40、CD80和CD86表达分别平均为90.23％、73.68％、85.96％、57.55％,与未经肿瘤抗原冲击DC比较,DC成熟的表面标志分子表达明显增加(P＜0.01).相同效靶比下,CIK+DC细胞组对SW480的杀伤作用最强,明显高于其他细胞组(P＜0.01);CIK+ DC细胞组在效靶比为45∶1时,杀伤活性最强(P＜0.01);单独CIK细胞组的杀伤活性明显高于LAK+DC细胞组(P＜0.01);LAK+ DC细胞组的杀伤活性明显高于单独LAK细胞组(P＜0.01).效靶比为45∶1时,各杀伤试验细胞组上清液中IFN-γ、IL-2、IL-12、IL-17的分泌量,CIK+DC细胞组的IFN-γ、IL-12的分泌量显著高于其他细胞组(P＜0.05);LAK+DC、单独LAK细胞组IL-2的分泌量明显高于CIK+DC、单独CIK细胞组(P＜0.05);单独CIK细胞组IFN-γ的分泌量明显高于LAK+DC、单独LAK细胞组(P＜0.05).[结论]CIK+DC细胞组对SW480的杀伤活性明显强于单独CIK、LAK+ DC组、单独LAK细胞组.其机制可能是,SW480抗原致敏的DC分泌IFN-γ、IL-12等刺激、诱导CIK细胞的活化和增殖,明显增强CIK细胞杀伤SW480的活性.     

Dendritic cells: specialized antigen presenting cells

Renewing interest in cancer immunotherapy reflects the excellent results that have been obtained in animal models and the promising results in early clinical trails with dendritic cell (DC) based approaches. The central role that DCs play in the initiation of an immune response raises the possibility of using them to trigger specific anti-tumor immunity. In addition, deeper knowledge of DC biology will allow better understanding of the mechanism(s) underlying allergic and autoimmune diseases as well as tolerance phenomena. These crucial issues were critically reviewed during a workshop organized by the Italian Society for Experimental Hematology in Florence, Italy, on March 18th, 1999. The chairmen have prepared this report for the readers of Haematologica.     

树突状细胞联合细胞因子诱导的杀伤细胞对胃癌细胞杀伤作用

目的探讨树突状细胞联合细胞因子诱导的杀伤细胞对胃癌细胞的杀伤作用。方法采用胃癌患者自身血液中单个核细胞(peripheral blood mononuclear cells,PBMC),经体外诱导分别扩增出DC和CIK细胞,二者共同培养后,利用MTT法检测DC细胞联合CIK细胞体外杀伤人胃癌细胞株(MNK-45、MNK-28、SG-7901)的活性。结果DC与CIK细胞共培养后得到的细胞群高表达CD3 CD56 ,平均值达到(56.74±7.63)%。通过彼此相互作用诱导出的细胞群体对胃癌细胞株MNK-45、MNK-28、SG-7901有杀伤作用,且杀伤活性随着效靶比的增加而增强。结论DC与CIK细胞共培养后有很强的增殖能力,对胃癌细胞具有杀伤活性,且其杀伤作用与胃癌细胞类型无相关性。