树突细胞-食管癌融合细胞体外诱导特异性抗食管癌免疫反应

背景与目的:树突细胞(dendritic cells,DC)是人体专职的抗原呈递细胞,以DC为基础的DC/肿瘤细胞融合疫苗可以有效地诱导特异性抗肿瘤免疫应答.本研究旨在探讨成熟的DC与人食管癌细胞株ECl09细胞融合疫苗体外诱导特异性抗食管癌细胞的免疫反应.方法:从健康志愿者外周血中分离出单个核细胞(peripheral blood mononuclear cells,PBMC),在重组人粒/巨噬细胞集落刺激因子(recombinant human granulocyte-macrophage-colony-stimulating factor,rhGM-CSF)和白介素(interleukin-4,IL-4)作用下体外诱导DC,采用聚乙二醇(polyethylene glyco1,PEG)融合法使DC与EC109细胞融合制备DC/EC109细胞融合疫苗,四甲基偶氮唑盐(MTT)实验检测融合疫苗刺激T淋巴细胞增殖的活性,乳酸脱氢酶(LDH)实验检测融合疫苗活化的细胞毒性T淋巴细胞(cytotoxic T lymphocyte,CTL)在体外特异性杀伤EC109细胞的活性,并与对人胃癌细胞株SGC7901及人乳腺癌细胞株MCF7的杀伤作用进行比较.结果:DC与EC109细胞的融合效率最高达到22.25%.DC/EC109细胞融合疫苗能有效地刺激T淋巴细胞的增殖反应,其刺激T淋巴细胞增殖的能力显著高于DC或EC109细胞(P＜0.05).DC/EC109细胞融合疫苗活化的CTL对EC109细胞具有特异性的杀伤作用,对EC109细胞的杀伤作用显著强于对SGC7901细胞及MCF7细胞的杀伤作用(P＜0.05).结论:DC/EC109细胞融合疫苗能有效诱导抗EC109细胞的特异性免疫应答.     

γ-synuclein在食管癌中的表达及其对食管癌Eca-109细胞侵袭力的影响

目的:研究γ-synuclein在食管癌中的表达及其对人食管癌细胞株Eca-109侵袭力的影响.方法:选取2010年1月至12月于河北医科大学第四医院食管癌患者组织标本30例,同时取10例正常食管组织作对照.采用免疫组化法观察食管癌组织中γ-synuclein的表达情况.采用脂质体法转染含γ-synuclein的重组质粒pcDNA3.0-γ-synuclein,应用RT-PCR检测转染后Eca-109细胞中γ-synuclein mRNA的表达,流式细胞术检测γ-synuclein蛋白的表达,利用Transwell实验检测转染后Eca-109细胞侵袭力的变化.结果:与正常食管组织相比,食管癌组织中γ-synuclein蛋白阳性表达率明显增强(83.3％ vs40.0％,P＜0.05),Ⅰ-Ⅱ期食管癌患者γ-synuclein表达率明显低于Ⅲ-Ⅳ期(22.2％ vs 76.2％,P＜0.05).pcDNA3.0-γ-synuclein质粒转染后,Eca-109细胞中γ-synuclein mRNA表达水平显著高于空质粒转染组和未转染组[(1.10±0.03)vs(0.42±0.03),(0.45±0.15),P＜0.01],蛋白表达水平也明显增高[(1.05 ±0.061) vs (0.80±0.45),(0.79 ±0.46);P＜0.05],穿膜细胞数明显增加[(167 ±2.51)vs(65 ±2.60),(70±2.50);P＜0.01].结论:食管癌组织高表达γ-synuclein,其表达上调能增强人食管癌Eca-109细胞的侵袭力,提示其在食管癌的转移和恶性发展中发挥重要作用.     

MAGE-3/CEA(HLA-A2/A24+)肽疫苗冲击树突状细胞诱导消化道肿瘤患者CTL的研究

目的:树突状细胞(DC)是一种重要的抗原递呈细胞,在T细胞参与的HLA限制性免疫应答中起重要作用.已证实在动物模型中DC递呈抗原可以诱导出T细胞介导的免疫反应.我们在体外扩增获得肿瘤患者DC,观察其特点,并以MAGE-3/CEA(HLA-A2/A24+)肽疫苗冲击DC诱导特异性CTL,研究其杀伤活性.方法:选择MAGE-3-HLA-A2/A24+或CEA-HLA-A24+肿瘤患者,收集PBMNC中的贴壁细胞,在含有rhGM-CSF、rhIL-4的1640中培养诱导DC细胞,第7天加入HLA-A2-MAGE-3、HLA-A24-MAGE-3、HLA-A24-CEA肽冲击.以肽冲击后的DC与未经纯化的T细胞混合培养(T-DC-P)诱导的CTL作为效应细胞,Mel526,803,Raji,K562作为靶细胞,以LDH法检测特异性CTL的杀伤力.结果:体外扩增可获得高纯度的DC,高表达DC特异性表面标志CD40(74.18%±15.76%)、CD86(94.6%±3.80%)、HLA-DR(88.6%±10.94%).不同肿瘤患者DC得率表现出较大差异(7.07%±3.24%),反映出免疫功能的不同.T-IL-2细胞与T-DC-P细胞对Mel526和803细胞株的杀伤活性有显著性差异(P＜0.01),可以将特异性杀伤力提高25%～35%,而对Raji和K562细胞株的杀伤活性无显著性差异(P＞0.01).结论:rhGM-CSF、rhIL-4体外联合应用可扩增出高纯度DC,肽疫苗冲击后的DC可诱导出MAGE、CEA特异性的CTL应答.表明DC为基础的疫苗是肿瘤免疫治疗重要的新方法,因其具有简便、快速的特点,有良好的前景.     

茶多酚对食管癌Eca-109细胞生长的影响

目的:研究茶多酚对食管癌Eca-109细胞的生长抑制作用。方法:采用MTT法检测茶多酚对食管癌Eca-109细胞生长活性的抑制,BrdU掺入实验分析茶多酚对食管癌Eca-109细胞增殖指数的影响,流式细胞分析仪分析茶多酚对食管癌Eca-109细胞周期及细胞凋亡的影响。结果:MTT实验证实茶多酚对食管癌Eca-109细胞生长有抑制作用,且呈剂量-效应关系。BrdU掺入实验证实茶多酚可以降低食管癌Eca-109细胞的生长分数。流式细胞仪检测发现茶多酚可以阻滞食管癌Eca-109细胞的细胞周期,使其停滞于G0/G1期,并诱导食管癌Eca-109细胞凋亡。结论:茶多酚对食管癌Eca-109细胞有抑制作用,机制可能与降低食管癌Eca-109细胞的增殖指数、阻滞细胞及诱导细胞凋亡有关。     

MAG E-3/CEA(HLA-A2/A24+)肽疫苗诱导消化道肿瘤患者CTL的研究

目的：研究肿瘤患者树突状细胞经MAGE－3／CEA(HLA-A2/A24 肽疫苗冲击后诱导特异性CTL的杀伤活性。方法：选择MAGE－3－HLA－A2／A24＋或CEA－HLA－A24肿瘤患者，收集PBMNC中的贴壁细胞在含有rhGM-CSF、rhIL-4的1640中培养诱导DC细胞，第7日加入HLA－A2－MAGE－3，HLA－A24－MAGE－3、HLA－A24－CEA肽冲击。以肽冲击后的DC与未经纯化的T细胞混合培养诱导的CTL作为效应细胞，Mel526,803,Raji,K562作为靶细胞，以LDH法检测特异性CTL的杀伤力。结果：未纯化的T细胞及肽冲击后的DC与该T细胞混合培养后的细胞表型变化表明CD3、CD4、CD25、CD16／CD56均无显著性差异，表达的CD8、CD86、CD69、CD45RO／CD8、HLA－DR有显著性差异。T－IL－2细胞与T－DC－P细胞对Raji和K562细胞株的杀伤活性无显著性差异。T－IL－2细胞与T－DC－P细胞对Mel256和803细胞株的杀伤活性有显著性差异。结论：肽疫苗可以诱导MAGE、CEA特异性的CTL应答。DC为基础的疫苗是肿瘤免疫治疗的重要的新方法，因其简便、快速的特点，具有良好的前景。     

CpG ODN协同MAGE-3 抗原肽致敏DC疫苗对膀胱癌细胞BIU-87 的抑制作用

目的：探讨含未甲基化胞嘧啶鸟嘌呤(CpG)序列的细菌寡核苷酸（CpG oligodeoxynucleotide,CpG ODN）免疫佐剂在增强黑色素瘤抗原基因-3(melanoma antigen gene -3,MAGE-3)抗原肽致敏DC抗膀胱肿瘤细胞的作用及其分子机制。方法：采用Ficoll 法从健康志愿者HLA-A2 型外周血中分离单个核细胞,常规方法诱导培养制备成熟DC。MTT法检测不同方式（MAGE-3、CpG ODN、MAGE-3+CpG ODN 和无关抗原对照）致敏DC 对T 淋巴细胞增殖和CTL 对靶细胞BIU-87 的杀伤作用。CpGODN+MAGE-3 抗原肽致敏DC抗裸鼠BIU-87 膀胱癌细胞移植瘤治疗7、11 d 测定移植瘤质量变化,MTT和Western blotting 法分别检测移植瘤细胞的增殖水平及其凋亡蛋白表达的变化。结果：CpG ODN+MAGE-3 抗原肽致敏DC能够促进T淋巴细胞增殖（P<0.05）,并显著提高活化T淋巴细胞的CTL对靶细胞BIU-87 的杀伤活性（P<0.05）。体内实验表明,致敏DC治疗7、11 d 的各组移植瘤质量均明显降低（均P<0.05）,移植瘤的增殖能力下降也较明显（P<0.05）;与其他致敏DC方式相比较,尤以CpG ODN+MAGE-3 致敏DC组在治疗11 d 时的移植瘤质量降低非常显著（P<0.01）,且明显促进荷瘤小鼠脾脏单个核细胞的增殖能力（P<0.01）;该组在治疗第3 天起移植瘤组织Bcl-2 表达水平明显降低、Bax水平明显升高（均P<0.05 或P<0.01）。结论：CpG ODN能促进MAGE-3 抗原肽致敏DC对膀胱癌BIU-87 细胞的抑制作用,为膀胱癌DC疫苗的临床应用提供了实验依据。     

MAGE—3／CEA（HLA—A2／A24＋）肽疫苗冲击树突状细胞诱导消化道肿瘤患者CTL的研究

目的树突状细胞(DC)是一种重要的抗原递呈细胞,在T细胞参与的HLA限制性免疫应答中起重要作用.已证实在动物模型中DC递呈抗原可以诱导出T细胞介导的免疫反应.我们在体外扩增获得肿瘤患者DC,观察其特点,并以MAGE-3/CEA(HLA-A2/A24+)肽疫苗冲击DC诱导特异性CTL,研究其杀伤活性.方法选择MAGE-3-HLA-A2/A24+或CEA-HLA-A24+肿瘤患者,收集PBMNC中的贴壁细胞,在含有rhGM-CSF、rhIL-4的1640中培养诱导DC细胞,第7天加入HLA-A2-MAGE-3、HLA-A24-MAGE-3、HLA-A24-CEA肽冲击.以肽冲击后的DC与未经纯化的T细胞混合培养(T-DC-P)诱导的CTL作为效应细胞,Mel526,803,Raji,K562作为靶细胞,以LDH法检测特异性CTL的杀伤力.结果体外扩增可获得高纯度的DC,高表达DC特异性表面标志CD40(74.18%±15.76%)、CD86(94.6%±3.80%)、HLA-DR(88.6%±10.94%).不同肿瘤患者DC得率表现出较大差异(7.07%±3.24%),反映出免疫功能的不同.T-IL-2细胞与T-DC-P细胞对Mel526和803细胞株的杀伤活性有显著性差异(P＜0.01),可以将特异性杀伤力提高25%～35%,而对Raji和K562细胞株的杀伤活性无显著性差异(P＞0.01).结论rhGM-CSF、rhIL-4体外联合应用可扩增出高纯度DC,肽疫苗冲击后的DC可诱导出MAGE、CEA特异性的CTL应答.表明DC为基础的疫苗是肿瘤免疫治疗重要的新方法,因其具有简便、快速的特点,有良好的前景.     

siRNA干扰STAT3基因对食管癌Eca-109细胞生物学特性的影响

目的:探讨RNA干扰技术沉默STAT3信号传导通路对人食管癌Eca-109细胞增殖、细胞周期和凋亡的影响.方法:针对人STAT3基因mRNA序列设计合成3对编码小干扰RNA(siRNA)的DNA模板,将其连入pRNAT-U6.1/neo质粒中,构建STAT3-siRNA表达载体,稳定转染人食管癌Eca-109细胞,利用RT-PCR、Western blot技术分别检测转染细胞中STAT3基因mRNA和蛋白的表达,MTT实验、流式细胞技术检测转染细胞的增殖、细胞周期和凋亡变化情况.结果:成功构建STAT3-siRNA表达载体,经测序鉴定正确.RT-PCR和Western blot结果显示,STAT3-siRNA3表达载体明显抑制了人食管癌Eca-109细胞中STAT3基因mRNA和蛋白的表达,与对照组相比,差异有统计学意义(P＜0.01).MTT实验显示,稳定转染siRNA后,siRNA3实验组细胞的增殖能力明显下降,细胞生长抑制卒为35.68%,较对照组明显升高,差异有统计学意义(P＜0.01).流式细胞技术显示,siRNA3实验组出现了细胞周期阻滞和细胞凋亡,细胞周期阻滞于G_0/G_1期,细胞凋亡率为13.26%,明显高于对照组,差异有统计学意义(P＜0.01);结论:RNA干扰技术沉默STAT3基因可以有效地抑制STAT3基因的表达,进而抑制人食管癌Eca-109细胞的增殖,引起细胞周期G_0/G_1期阻滞,促进其凋亡.     

尼美舒利对人食管癌Eca-109细胞凋亡及Survivin和Caspase-3表达的影响

目的:观察环氧化酶-2(COX-2)选择性抑制剂尼美舒利对人食管癌Eca-109细胞增殖及凋亡的影响,研究其对凋亡抑制蛋白Survivin和Caspase-3表达的影响,探讨尼美舒利诱导Eca-109细胞凋亡的作用机制.方法:尼美舒利作用Eca-109细胞后,MTT法测定尼美舒利对人食管癌Eca-109细胞增殖的抑制率;电子显微镜和流式细胞仪检测细胞凋亡:RT-PCR法检测Eca-109细胞Survivin mRNA表达变化,Western blot检测Survivin和Caspase-3蛋白表达变化.结果:尼美舒利(50～400μmol/L)对Eca-109细胞生长有抑制作用,随浓度升高、时间延长抑制作用增强,并诱导Eca-109细胞凋亡,呈剂量-时间效应关系;尼美舒利可降低Survivin mRNA和蛋白表达,增加Caspase-3蛋白表达.结论:尼美舒利可诱导人食管癌细胞株Eca-109凋亡,其机制可能与下调Survivin表达及激活Caspase-3表达有关.     

CpG联合MUC1增强人外周血树突状细胞功能的实验研究

目的：观察CpG联合黏蛋白1（MUC1）应用对树突状细胞（DC）刺激T细胞增殖作用的影响。方法：应用淋巴细胞分离液分离人外周血单核细胞,体外培养应用GM－CSF、IL－4、TNF－α等细胞因子诱导DC,观察细胞形态,并通过流式细胞术检测细胞标志物CD80、CD86。收获DC按如下分组：A：DC;B：DC＋CpG;C：DC＋MUC1;D：DC＋CpG＋MUC1;E：CpG＋MUC1,分别与T淋巴细胞混合培养,通过MTT法检测T细胞增殖情况。结果：DC表型检测结果为：CD80＋细胞占70．4％,CD86＋细胞占72．0％,呈现成熟DC表型。MUC1与DC联合疫苗与淋巴细胞混合培养显示：DC具有刺激T细胞增殖的作用,CpG＋DC组和MUC1＋DC组,分别较单纯DC组对T细胞的刺激增殖作用明显增强（P＜0．01）,DC＋CpG＋MUC1组又明显高于单用MUC1或CpG＋DC组,差别显著（P＜0．01）,单纯加CpG和MUC1（无DC组）则基本无明显刺激T细胞增殖作用。结论：CpG联合MUC1能明显提高DC促T细胞增殖的功能。     

Stimulatory effects of CpG oligodeoxynucleotide on dendritic cell‐based immunotherapy of colon cancer in CEA/HLA‐A2 transgenic mice

Immunostimulatory DNA containing unmethylated cytosine‐guanine (CpG) motifs have been successfully used as adjuvants to enhance the immunity of vaccines designed to trigger antitumor T‐cell responses. We examined the effect of a CpG oligodeoxynucleotide (CpG ODN) for its ability to potentiate the activity of tumor antigen‐pulsed dendritic cells (DC) in a clinically relevant mouse model, which is transgenic for both carcinoembryonic antigen (CEA) and HLA‐A2 for the treatment of colon carcinoma in a therapeutic setting. The systemic administration of CpG ODN 1826 alone had modest effect on tumor growth when tumors were palpable and had no effect with larger tumor burden. However, coadministration of CpG ODN 1826 with the vaccine provided significant increase in tumor‐free survival compared with mice immunized with DC‐based vaccines alone. The DC/CpG combined vaccination strategy resulted in increased secretion of Th1 cytokines and HLA‐A2‐restricted CEA‐specific CTL responses were also enhanced. Both tumor regression and extended tumor‐free survival resulting from DC/CpG combination therapy required the participation of T cells. Tumor‐free mice were resistant to tumor rechallenge and immunity conferred by the vaccine was transferable in athymic nude mice. These results provide evidence that vaccination with antigen‐pulsed DC with CpG ODN as adjuvant can lead to effective tumor regression and long‐term survival in a murine model of colon carcinoma. © 2008 Wiley‐Liss, Inc.     

腺病毒介导NDRG2在体外对人食管鳞癌细胞系Eca-109增殖和凋亡的影响

目的:研究抑癌候选基因NDRG2在体外对人食管鳞癌细胞系Eca-109增殖和凋亡的影响.方法:腺病毒介导NDRG2转染人食管鳞癌细胞系Eca-109,逆转录酶-多聚酶链反应(RT-PCR)和Western blot法分别检测NDRG2基因的mRNA和蛋白表达水平,甲基嚷唑基四唑法(MTT法)绘制细胞生长曲线,流式细胞仪(FCM)分别分析细胞周期和细胞凋亡.结果:腺病毒介导NDRG2转染人食管鳞癌细胞系Eca-109后,NDRG2的mRNA和蛋白表达水平明显上调,细胞增殖受到明显抑制(P＜0.05);流式细胞仪检测显示,与对照组相比,感染后48小时Eca-109细胞G2期细胞明显减少(P＜0.01),S期细胞明显增多(P＜0.01);转染后的Eca-109细胞中凋亡细胞明显增多,感染48h后达16.0%.结论:过表达NDRG2可明显抑制人食管鳞癌细胞Eca-109的增殖并诱导细胞凋亡.     

食管癌细胞株高侵袭力亚系的建立及其生物学特性研究

目的:建立具有不同转移潜能的高侵袭能力食管癌细胞株亚系并研究其生物特性.方法:利用Transwell侵袭小室从人食管鳞癌Eca-109细胞株筛选高侵袭能力食管癌亚系,HE染色比较细胞形态;四甲基偶氯唑蓝(MTT)法检测细胞增殖能力的变化;流式细胞术( FCM)检测细胞周期;蛋白质印迹法检测与侵袭能力相关基质金属蛋白酶-2(MMP-2)和金属蛋白醇组织抑制因子-2(TIMP-2)蛋白表达.结果:利用Transwell侵袭小室从食管癌Eca-109细胞株中筛选出高侵袭能力食管癌细胞株亚系,命名为Eca-109 T4.2个细胞系细胞形态没有明显差异.MTT法检测显示,亚系Eca-109 T4增殖能力强.细胞周期显示,增殖指数(PI)高,PI=41.0％,且MMP-2蛋白表达相比增高,P=0.023;TIMP-2蛋白表达相比增高,但差异无统计学意义,P=0.392.结论:建立了不同转移潜能的高侵袭能力食管癌细胞株亚系,将可以用于探讨食管癌转移机制的研究.     

Co-administration of carcinoembryonic antigen and HIV TAT fusion protein with CpG-oligodeoxynucleotide induces potent antitumor immunity

Although dendritic cells (DC) have been well demonstrated as a strong cellular adjuvant for a tumor vaccine, there are several limitations for clinical application. A protein-based vaccine using a potent adjuvant is an appealing approach for tumor antigen-specific immunotherapy because of their simplicity, safety, efficacy and capacity for repeated administration. CpG-oligodeoxynucleotides (ODN) have been used as adjuvants to stimulate innate and adaptive immune responses for cancer treatment. The authors evaluated the adjuvant effects of CpG-ODN in a vaccine incorporating recombinant fusion protein of the HIV TAT PTD domain and carcinoembryonic antigen (TAT-CEA). Mice vaccinated with TAT-CEA and CpG-ODN (TAT-CEA + CpG) showed enhanced CEA-specific immunity, including cytotoxic T-lymphocytes (CTL) activity and interferon (IFN)-γ secreting T cells compared with CEA and CpG-ODN (CEA + CpG) or TAT-CEA vaccination alone. Vaccination with TAT-CEA + CpG elicited Th1-based responses, as indicated by the higher ratio of immunoglobulin (Ig)G2a antibody/IgG1 antibodies specific for CEA. The survival rate was significantly increased after vaccination with TAT-CEA + CpG in a tumor model using MC38/CEA2. Furthermore, the TAT-CEA ± CpG vaccine groups showed similar antitumor immunity to the CEA peptide-pulsed DC (CEA peptide/DC) vaccine groups. These data suggest that coadministration of TAT fusion protein with CpG-ODN may serve as a potential formulation for enhancing antitumor activity. ( Cancer Sci 2008; 99: 1034–1039)     

Potentiation of a dendritic cell vaccine for murine renal cell carcinoma by CpG oligonucleotides.

PURPOSE: An ideal vaccine therapy for tumors should activate both effector and memory immune responses against tumor-specific antigens. Here we investigated the effect of CpG oligodeoxynucleotides (CpG-ODN) for their ability to potentiate the activity of tumor antigen-pulsed bone marrow-derived dendritic cells (DC) in a vaccine model for the treatment of murine renal cell carcinoma (RENCA). EXPERIMENTAL DESIGN: First we evaluated the effects of a murine renal cell carcinoma (RENCA) on immune cell activity in a mouse model using in vitro assays for T-cell proliferation and natural killer cell activation. To overcome the immune suppression of the tumor, we s.c. injected groups of 10 mice with dendritic cells and tumor cells. We compared the effect of different conditioning regimens of the DCs with RENCA antigen and/or CpG-ODNs before injection by measuring tumor size twice a week. RESULTS: Tumor growth was shown to negatively affect spleen cell and T-cell proliferation, IFN-gamma production, natural killer cell activity, and NF-kappaB activation in T cells. In this model, we have shown that RENCA-pulsed CpG-ODN-treated DCs were able not only to significantly reduce tumor growth but also to prevent tumor implantation in 60% of mice. Tumor-free mice were resistant to tumor challenge and the immunity conferred by the vaccine was transferable and tumor specific. CONCLUSIONS: This data show that RENCA down-modulates the immune response, and DC vaccine therapy, in conjunction with CpG-ODN, can restore tumor-specific immunity.     

Identification of human leukocyte antigen-A24-restricted epitope peptides derived from gene products upregulated in lung and esophageal cancers as novel targets for immunotherapy

For the development of cancer vaccine therapies, we have searched for possible epitope peptides that can elicit cytotoxic T lymphocytes (CTL) to the TTK protein kinase ( TTK ), lymphocyte antigen 6 complex locus K ( LY6K ) and insulin-like growth factor (IGF)-II mRNA binding protein 3 ( IMP-3 ), which were previously identified to be transactivated in the majority of lung and esophageal cancers. We screened 31, 17 and 17 candidate human leukocyte antigen (HLA)-A*2402-binding peptides to parts of TTK , LY6K and IMP-3 , respectively. As a result, we successfully established strong CTL clones stimulated by TTK-567 (SYRNEIAYL), LY6K-177 (RYCNLEGPPI) and IMP-3-508 (KTVNELQNL) that have specific cytotoxic activities against the HLA-A24-positive target cells pulsed with the candidate peptides. Subsequent analysis of the CTL clones also revealed their cytotoxic activities against lung and esophageal tumor cells that endogenously express TTK, LY6K or IMP-3. A cold target inhibition assay further confirmed that the CTL cell clones specifically recognized the MHC class I–peptide complex. Our results strongly imply that TTK, LY6K and IMP-3 are novel tumor-associated antigens recognized by CTL, and TTK-567 (SYRNEIAYL), LY6K-177 (RYCNLEGPPI) and IMP-3-508 (KTVNELQNL) are HLA-A24-restricted epitope peptides that can induce potent and specific immune responses against lung and esophageal cancer cells expressing TTK, LY6K and IMP-3. ( Cancer Sci 2007; 98: 1803–1808)     

人参皂苷Rh2通过Egr-1/TRL4/mTOR信号通路抑制食管癌细胞Eca-109增殖、迁移和EMT

目的:研究人参皂苷Rh2对食管癌细胞Eca-109增殖、迁移和上皮间质转化（epithelial-mesenchymal transition,EMT）的作用以及作用机制。方法:CCK-8法检测人参皂苷Rh2对食管癌细胞Eca-109增殖的影响;细胞划痕实验检测人参皂苷Rh2对食管癌Eca-109细胞迁移的影响;Western blot检测EMT相关蛋白E-cadherin、Vimentin和Slug的蛋白表达水平。结果:人参皂苷Rh2能够显著抑制Eca-109细胞的增殖,且呈剂量依赖性;此外,人参皂苷Rh2显著抑制E-cadherin、Vimentin和Slug的蛋白表达,并抑制Eca-109细胞迁移;人参皂苷Rh2显著抑制Egr-1、TRL4和mTOR的蛋白表达;进一步的研究结果表明人参皂苷Rh2通过抑制Egr-1/TRL4/mTOR信号通路抑制食管癌细胞Eca-109增殖、迁移和EMT。结论:人参皂苷Rh2能够抑制食管癌细胞Eca-109的增殖、迁移和EMT,其作用机制是通过介导Egr-1/TRL4/mTOR信号通路来实现的。这一结果能够为治疗食管癌的进一步研究提供分子基础。     

IL-27基因修饰树突状细胞活化的特异性CTL对人食管癌裸鼠移植瘤生长增殖的影响

研究IL-27基因转染树突状细胞（DC）体内诱导免疫杀伤食管癌细胞的效能及其机制。方法:基因转染的方法建立表达IL-27基因的树突状细胞（DC/IL-27）;构建人食管癌细胞裸鼠移植瘤模型,皮下注射食管癌细胞抗原致敏、IL-27基因修饰DC（DC/IL-27-Ag）活化的特异性CTL后观察荷瘤裸鼠抑瘤率;TUNEL法检测荷瘤裸鼠肿瘤细胞的原位凋亡;流式细胞术检测移植瘤细胞的细胞周期、凋亡率。结果:RT-PCR显示DC/IL-27细胞中有IL-27 p28和EBI3亚基基因表达提示转染成功;免疫接种DC/IL-27-Ag活化的CTL组的抑瘤率为58.28%,明显高于其他组,差异有统计学意义（P<0.01）。TUNEL法检测显示,DC/IL-27-Ag活化的CTL组凋亡率明显高于其他组（P<0.01）,流式细胞术（FCM）显示肿瘤组织内细胞增殖指数为（23.92±1.60）%,显著低于其他组,差异有统计学意义（P<0.01）;细胞凋亡率为（32.78±0.83）%,显著高于其他组,差异有统计学意义（P<0.01）。结论:DC/IL-27-Ag可活化特异性CTL,在裸鼠体内产生了抑制肿瘤生长的作用,显著抑制食管癌细胞增殖、促进其凋亡,为DC应用于食管癌的免疫治疗提供了理论和动物实验依据。