冻融抗原冲击致敏的树突状细胞抗肿瘤作用的研究

目的研究MC-38肿瘤冻融抗原致敏的树突状细胞(DC)对荷瘤小鼠是否有抗肿瘤作用。方法用MC-38肿瘤冻融抗原体外冲击致敏小鼠骨髓来源的DC,观察其诱导的CTL对MC-38肿瘤细胞的杀伤活性;体内以1×106DC/只多次接种于已荷瘤小鼠同侧腹股沟皮下,观察抗原冲击的DC对肿瘤生长的抑制作用以及对荷瘤小鼠生存期的影响。结果体外抗原冲击致敏的DC诱导的CTL对MC-38肿瘤细胞具有显著的杀伤作用,在效靶比为50∶1,25∶1,12.5∶1,6.25∶1时其杀伤率分别为68.84%,58.36%,41.56%,24.96%,;抗原冲击致敏的DC体内多次皮下免疫后对肿瘤的生长具有显著的抑制作用,能显著延长荷瘤小鼠的生存期。结论肿瘤冻融抗原致敏DC多次皮下免疫对荷瘤小鼠具有显著的抗肿瘤作用。     

脐带血与外周血来源树突细胞体外刺激特异抗白血病T细胞免疫应答

目的：比较脐血（CB）及外周血（PB）单个核细胞（MNC）体外诱导生成树突状细胞（DC）的产量;并将此DC负载白血病抗原,检测两者诱导的特异性细胞毒T细胞（CTL）对白血病细胞的杀伤活性。方法：取CB及健康成人PB各8份,以淋巴细胞分离液分离获得MNCs,培养体系中加入重组人粒单核细胞集落刺激因子（rhGM-CSF）,重组人白细胞介素4（rhIL-4）和肿瘤坏死因子α（TNF-α）,并在培养第5天,加入HL-60细胞经反复冻融提取的抗原,致敏DC。培养过程中,观察树突状细胞形态,流式细胞仪（FCM）检测表型。培养第12天收获成熟DC,CB组分别与8例PB来源T淋巴细胞共培养;PB组与自体T淋巴细胞共培养,诱导产生白血病特异性CTL,乳酸脱氢酶法（LDH法）测定溶靶细胞活性。结果：（1）CB与PB来源DC均表现出成熟DC典型形态和免疫表型特征,2组DC相关分化抗原CD1a、CD83、CD86、CD80和人类白细胞相关抗原DR（HLA-DR）的表达较培养前增高,2组比较差异无统计学意义（P〉0.05）。（2）CB组DC产量高于PB组,差异有统计学意义（P〈0.01）。（3）以白血病抗原冲击的DC所刺激的T淋巴细胞对白血病靶细胞显示出明显的杀伤活性,按照各效靶比进行两者的比较,差异无统计学意义（P〉0.05）。结论：利用细胞因子体外诱导CB及PB来源MNCs均能产生大量成熟DC,且功能相同;前者DC产量更高,来源丰富,可能成为急性白血病免疫治疗中DC的丰富来源。     

不同抗原致敏树突状细胞对荷瘤大鼠经射频消融后免疫机能的影响

目的本研究在大鼠Walker256实体瘤射频消融术（RFA）后应用不同肿瘤抗原致敏的DC瘤苗,探讨其对大鼠抗肿瘤免疫的不同影响。方法38只荷Walker256实体瘤SD大鼠随机分成3组：对照组行RFA治疗,实验组1行RFA＋冻融抗原致敏DC治疗,实验组2行RFA＋热休克冻融抗原致敏DC治疗。治疗前及治疗后第4天分别测量各组大鼠外周血中CD4^＋T淋巴细胞、CD8^＋T淋巴细胞及CD4^＋/CD8^＋比值,记录大鼠的荷瘤生存期。结果治疗后各组荷瘤大鼠外周血中CD8^＋T细胞均呈下降改变,其中,下降的程度为实验组2〉实验组1〉对照组（P〈0.05）;CD4^＋/CD8^＋比值的变化,实验组2的升高与其他两组相比差异有统计学意义（P〈0.05）;实验组1的升高与对照组比差异无统计学意义（P〉0.05）。荷瘤生存期：实验组2〉实验组1〉对照组（P〈0.05）。结论在RFA后应用不同抗原致敏的DC可不同地程度改善大鼠的抗肿瘤免疫,冻融热休克抗原致敏DC较未热休克冻融抗原致敏DC能更有效地激发荷瘤大鼠的抗肿瘤免疫机能。     

耐药乳腺癌裸鼠模型免疫治疗初探

目的 耐药乳腺癌表现为治疗效果差,转移率高,死亡率高的一种恶性程度极高的肿瘤性疾病。有研究表明,细胞因子诱导的杀伤细胞（CIK）在树突细胞（DC）辅助下,对耐药肿瘤细胞的杀伤能力可能超过T细胞。本实验利用DC与CIK联合培养,比较在不同条件下对乳腺癌多药耐药细胞株的杀伤效应。 方法 分离健康人外周血获得单个核细胞,分别诱导为树突细胞（DC）和CIK细胞,将人类乳腺癌耐药细胞株MCF-7/ADR细胞的冻融物抗原冲击DC（AP-DC）,分别将DC与CIK细胞共培养（AP-DC+CIK 、DC+CIK）,CIK细胞单独培养作对照。用流式细胞仪分析细胞表型,酶联免疫吸附法（ELISA）测定分泌IL-12、TNF-α、IFN-γ和IL-2水平,MTT法测定细胞毒效应。结果 DC和CIK细胞共孵育,使CIK细胞的CD3CD56双阳性细胞的比例及分泌IFN-γ、TNF-α和IL-2的水平增高,DC的成熟表型和分泌IL-12的水平增加,其中均以AP-DC+CIK组增高最为明显,和其他组间比较差异有统计学意义。对乳腺癌耐药细胞MCF-7/ADR的细胞毒效应,AP-DC+CIK组杀伤效应最强, 与DC+CIK组和CIK组比较差异均有统计学意义;结论 经耐药肿瘤抗原负载的DC与CIK共同作用后,其对耐药乳腺癌细胞MCF-7/ADR的抗瘤免疫能力最强,为临床治疗耐药肿瘤带来希望。     

RNA转染树突状细胞疫苗研究进展

树突状细胞(dendritic cells,DC)是功能最强的专职抗原提呈细胞,能够激活初始T细胞.DC体外负载肿瘤抗原能够刺激有效的抗肿瘤免疫.肿瘤mRNA转染DC是一种简单而有效的抗原负载方式.大量研究表明mRNA转染优于其他抗原负载方式能产生强免疫原性的DC,而且,可从微量肿瘤组织大量扩增的mRNA使DC疫苗能应用于每个肿瘤病人.本文综述了肿瘤mRNA转染DC作为有效的肿瘤疫苗的研究进展和应用情况.     

免疫复合物与树突状细胞

免疫复合物(i mmune complexes,IC)是抗原与相应的抗体特异性结合的复合物,它可以在正常的免疫应答下产生,也可出现在异常的免疫应答中。而树突状细胞(den-dritic cell,DC)则是目前发现最强的专职抗原呈递细胞,能有效活化未致敏的T细胞;可表达参与抗原摄取和转运的特殊膜受体;能有效摄取和处理抗原,然后迁移至T细胞区;其抗原提呈效率高,少量抗原和少量DC即足以激活T细胞。DC广泛分布于机体所有组织和器官,根据分布部位可分为3类:(1)淋巴样组织DC,包括滤泡DC(FDC)、并指状DC和胸腺DC;(2)非淋巴样组织DC,包括朗格汉斯细胞和间质DC;…     

CpG ODN联合肿瘤抗原致敏的树突状细胞疫苗抑制和预防小鼠黑色素瘤的研究

探讨非甲基化的胞嘧啶鸟嘌呤二核苷酸(CpG)的脱氧寡核苷酸(oligodeoxynucleotide, ODN)联合肿瘤抗原致敏树突状细胞(DC)治疗和预防黑色素瘤的作用。首先从小鼠骨髓中分离得到骨髓来源的树突状细胞(BMDC),并将小鼠黑色素瘤B16细胞来源的全抗原与DC共孵育,采用全硫代修饰的CpG ODN作DC免疫刺激剂,制备DC疫苗。通过测定T淋巴细胞增殖和细胞毒性T淋巴细胞(CTL)对靶细胞B16的杀伤作用来评价该疫苗的体外免疫活性。将疫苗经小鼠腹腔注射,观察其治疗和预防小鼠黑色素瘤的效果。所有动物实验均在中国科学院上海药物研究所实验动物管理委员会(IACUC)的指导和标准下进行。结果显示, CpG ODN和肿瘤抗原联用致敏的DC疫苗能够促进T淋巴细胞增殖,并提高活化的T淋巴细胞对靶细胞B16的杀伤活性。体内实验表明,无论是治疗实验还是预防实验, DC疫苗组的平均瘤重和瘤体积均低于PBS对照组。实验结果证明基于CpG ODN和黑色素瘤肿瘤抗原制备的DC疫苗对肿瘤具有较好的抑制作用,为恶性黑色素瘤治疗提供了一个潜在的方案。     

树突状细胞诱导免疫效应细胞对胰腺癌细胞PC3凋亡和抑制的实验研究

目的 观察人树突状细胞(Dendritic cells，DC)体外扩增及其诱导免疫效应细胞对胰腺癌细胞系(PC3)凋亡和抑制作用。方法 用淋巴细胞分离液分离抗凝新鲜全血以获得单核细胞(Peripheral blood mononudear cells，PBMC)，用贴壁法获取DC和去DC的单核细胞(即免疫效应细胞)，并分别用人粒／巨噬细胞集落刺激因子(GM—CSF)、人白介素4(IL-4)、人肿瘤坏死因子(TNF—α)、PC3肿瘤相关抗原(PC3TAA)和人白介素2(IL-2)培养正常人或胰腺癌病人DC和免疫效应细胞，5—6天后将DC和免疫效应细胞混合培养1—2天并计数细胞。观察DC生长状况，检测DC表型(CD1a、CD80、CD83、CD86)。用乳酸脱氢酶法(1actate dehydrogenase)和MTT法检测DC诱导免疫效应细胞对PC3的抑制作用，TdT法检测培养上清液对PC3细胞的凋亡作用。结果 体外多种细胞因子和肿瘤相关抗原能有效引起DC增殖，并高表达CD80、CD83、CD86；体外实验中，酶法：最大抑制(杀伤)效率为62．4％，MTT法：最大抑制(杀伤)效率为98．1％；DC培养上清液和DC混合免疫效应细胞培养上清液均能有效地引起PC3凋亡。结论 DC在抗胰腺肿瘤中有重要作用。     

不同细胞因子诱导树突状细胞体外抗肿瘤效应研究

目的研究不同细胞因子诱导的树突状细胞(DC)体外抗肿瘤效应。方法常规分离健康人外周血单核细胞,分别采用粒巨噬集落刺激因子(GM-CSF),白细胞介素(IL)-4,肿瘤坏死因子(TNF),GM-CSF、IL-4、α干扰素(IFN-α)细胞因子组合将其诱导为DC,并分别负载SMMC7721细胞冻融抗原;用流式细胞仪检测第9天时细胞表面HLA-DR、CD1α、CD80、CD83的表达;采用四甲基偶氮唑盐比色(MTT)法检测各组刺激自体淋巴细胞增殖能力,并检测各组DC诱导的细胞毒性T淋巴细胞(CTL)对SMMC7721细胞株的杀伤率。结果第9天显微镜下观察各组细胞,其细胞形态无明显差异,但流式细胞仪显示IFN-α组DC其膜表面标志CD80、CD83、CD1a表达上调,在刺激同种T细胞增殖能力方面,较TNF-α组DC效果明显。且IL-12分泌明显增加。在肝癌细胞株SMMC7221杀伤实验中,培养液中加入IFN-α后杀伤效应明显。结论与TNF-α相比,IFN-α诱导DC一定程度上能增强其特异性杀伤能力。     

犀角地黄汤合方对DC激活ITP患者T细胞增殖分化的影响

目的 观察犀角地黄汤合方含药血清对树突状细胞（DC）激活T细胞增殖分化的影响及其对免疫性血小板减少症（ITP）的作用机制。方法 将10只雄性SD大鼠随机分为含药血清组和空白血清组,每组5只,分别使用犀角地黄汤合方和蒸馏水连续灌胃3 d,腹主动脉取血制备含药血清和空白血清。分选15例健康志愿者及8例ITP患者CD4⁺ T细胞,将荷载血小板抗原的DC与CD4⁺ T细胞共培养,采用随机数字表法分为对照组,模型组,犀角地黄汤合方低、中、高剂量组。对照组为荷载血小板抗原的DC与健康志愿者CD4⁺ T细胞,模型组和犀角地黄汤合方低、中、高剂量组为荷载血小板抗原的DC与ITP患者的CD4⁺ T细胞,其中对照组和模型组加入大鼠空白血清,犀角地黄汤合方低、中、高剂量组分别加入体积分数为5%、10%及20%大鼠含药血清。流式细胞术（FCM）检测CD4⁺ T细胞的增殖情况,各组调节性T细胞（Treg）和效应性T细胞（Teff）的比例以及CD4⁺ T表面程序性死亡受体-1（PD-1）的表达量;酶联免疫吸附试验检测各组细胞上清液中促炎因子白细胞介素（IL）-2、干扰素-γ（IFN-γ）、IL-17以及抑炎因子转化因子-β（TGF-β）、IL-10的表达量。结果 与对照组比较,模型组CD4⁺ T细胞增殖百分比、Teff细胞比例以及促炎因子IL-2、IFN-γ和IL-17升高（P<0.05）,Treg细胞比例、CD4⁺ T细胞表面PD-1表达量以及抑炎因子TGF-β、IL-10水平降低（P<0.05）;与模型组比较,犀角地黄汤合方低、中、高剂量组CD4⁺ T细胞增殖百分比、Teff细胞比例依次降低,Treg细胞比例、CD4⁺ T细胞表面PD-1表达量和抑炎因子IL-10、TGF-β升高（P<0.05）,促炎因子IL-2的量降低（P<0.05）;与模型组相比,犀角地黄汤合方中、高剂量组IFN-γ和IL-17降低（P<0.05）。结论 犀角地黄汤合方尤其是高剂量组含药血清能够在体外调节ITP患者CD4⁺ T细胞的过度增殖分化及细胞因子的分泌,这可能是犀角地黄汤合方治疗ITP机制之一。     

G1-4 A,an arabinogalactan polysaccharide from Tinospora cordifolia increases dendritic cell immunogenicity in a murine lymphoma model

The immunogenicity of dendritic cells (DC) is known to increase with their maturation state and both are induced by microbial products like LPS. In this study, we have investigated the effect of G1-4A, a polysaccharide isolated from Indian medicinal plant, Tinospora cordifolia on phenotypic and functional maturation of murine bone marrow derived dendritic cells (BMDC) and its ability to be used as an adjuvant in immunotherapy. G1-4A, enhanced surface expression of CD40, CD80, CD86, MHCII by BMDC in vitro and splenic DC in vivo. T cell allostimulatory activity and secretion of IL-12 and TNFα by BMDC were also increased. Treatment with G1-4A resulted in decreased phagocytosis and increased antigen processing that are characteristic of mature DC. G1-4A treated DC cross presented exogenous antigens on a MHC I background which resulted in the activation of cytotoxic T cells. These cells thus activated could cause lysis of target tumor cells in vitro. Administration of tumor lysate pulsed G1-4A treated DC resulted in decreased tumor burden in preventive as well as therapeutic tumor challenge experiments in a murine lymphoma model. These results thus confirm that G1-4A could be a promising nontoxic maturation agent to be potentially used in DC based immunotherapy of tumor.     

MAGE-1相关肽抗原致敏DC活化的淋巴细胞对HCC细胞的体外杀伤作用

目的观察MAGE-1九肽致敏树突状细胞(DC)活化的淋巴细胞对HCC细胞的体外杀伤作用,确定MAGE-1九肽负载DC作为HCC疫苗的可能性。方法用MAGE-1九肽负载DC并活化T淋巴细胞,以不同效靶细胞的比例对正常肝细胞、黑色素瘤细胞、HCC细胞进行杀伤实验,3H掺入法测定杀伤率。结果用MAGE-1九肽负载DC并活化T淋巴细胞对黑色素瘤细胞及HCC细胞均有明显杀伤作用,而对正常肝细胞无杀伤作用;无关抗原负载的DC所活化的淋巴细胞对三种细胞均无杀伤作用;无抗原负载的DC其活化淋巴细胞对靶细胞亦无杀伤作用。结论MAGE-1九肽致敏DC活化淋巴细胞对HCC细胞有明显杀伤作用,MAGE-1基因可作为免疫治疗HCC的攻击靶点,MAGE-1九肽与DC联合可成为免疫治疗HCC的疫苗。     

Improved efficacy of therapeutic vaccination with dendritic cells pulsed with tumor cell lysate against hepatocellular carcinoma by introduction of 2 tandem repeats of microbial HSP70 peptide epitope 407-426 and OK-432

Therapeutic vaccination with dendritic cells (DCs) pulsed with tumor cell lysate vaccine (H-D) represents an attractive approach for hepatocellular carcinoma (HCC) treatment. However, the efficacy of this approach is not most satisfactory for the low levels of T helper 1 (Th1)-type cytokines secretion and weak T cell responses. In this study, in order to increase the potency of H-D, two tandem repeats of microbial HSP70 peptide epitope 407–426 (2mHSP70_407-426, M2) which has been demonstrated to be effective in enhancing DC maturation were applied. The DC vaccine (HM-D) which was HCC tumor cell lysate pulsed with M2 was developed. Nevertheless, the immunotherapeutic effect was still not satisfactory enough even some promotion was obtained. Therefore, OK-432 (OK), which is a useful anti-cancer agent and effectively in stimulating DC maturation, was introduced to HM-D. Our results demonstrated that treatment with the improved DC vaccine which was tumor cell lysate pulsed with M2 and OK (HMO-D), compared with H-D and HM-D, significantly increased cell surface markers (MHC-I and II, CD40, CD80, CD86 and CD11c) expression on DCs, enhanced Th1-type cytokines (IL-12, TNF-α and IFN-γ) production but not Th2-type cytokine (IL-5) production, induced remarkable high levels of lymphocytes proliferation and CD8⁺ cytotoxic T-lymphocyte (CTL). Furthermore, immunization with HMO-D effectively reduced tumor progression and enhanced the survival of mice with H22 tumors. Besides, we also found that the capability of M2 in inducing the Th1 cytokines was stronger than OK. In view of these results, HMO-D vaccination provided a novel immunotherapeutic approach for the treatment of HCC.     

耐药乳腺癌免疫治疗的实验研究

目的:探讨耐药乳腺癌抗原负载的树突细胞(DC)与细胞因子诱导的杀伤细胞(CIK)联合培养后对同种乳腺癌荷瘤小鼠的可能治疗机制.方法:分离健康人外周血获得单个核细胞,分别诱导为DC和CIK细胞,将人类乳腺癌耐药细胞株MCF-7/ADR细胞的冻融物抗原冲击DC(AP-DC),分别将DC与CIK细胞共培养(AP-DC+CIK组、DC+CIK组),将细胞经尾静脉注入裸鼠体内,观察不同组荷瘤标本中MDR1的表达、肿瘤细胞凋亡及凋亡相关蛋白Bax和Bcl-2的表达.结果:AP-DC+CIK组、DC+CIK组、CIK组及生理盐水组MDR1/β-actin比值分别为0.14、0.57、0.81及0.98.生理盐水组、CIK组、DC+CIK组和AP-DC+CIK组平均凋亡指数差异有统计学意义(P＜0.001).各组Bcl-2及Bax蛋白表达的OD值差异有统计学意义(P＜0.01),Bcl-2/Bax值AP-DC+CIK组＜DC+CIK组＜CIK组＜生理盐水组.结论:经耐药乳腺癌抗原负载的DC与CIK共同作用后,诱导同种乳腺癌细胞凋亡强于单纯DC与CIK共同作用后及单独CIK的治疗效果.     

Apoptic renal carcinoma cells are better inducers of cross-presenting activity than their primary necrotic counterpart

Vaccination with tumor-loaded dendritic cells (DC) is a promising treatment strategy for patients with renal cell carcinoma (RCC). Cells undergoing cell death proved useful as a source of tumor antigen for DC loading. Both apoptotic and necrotic tumor cells have been shown to efficiently load RCC-tumor antigens on DC. However, no direct comparison of these two kinds of death has been attempted in the same RCC. We compared DC pulsed with apoptotic cells, whole cell lysates or their supernatants of the cell line K1, derived from a patient with clear cell RCC, to determine their ability to activate T cells. Monocyte-derived DCs were pulsed with the different sources of tumor antigen, matured and co-cultured with autologouos peripheral blood lymphocytes. After three weekly re-stimulations with DCs, generation of cytotoxic T lymphocytes CTL was assessed by IFN-gamma release in an ELISpot assay in the presence of the sensitizing target. By comparison with lysate, apoptotic tumor cells induced a higher frequency of MHC class I-restricted IFN-gamma releasing lymphocytes. A higher CTL response was induced by pulsing DCs with cell lysate supernatant compared with whole cell lysate. These results indicate that, although necrotic death has been regarded as highly permissive when compared to apoptotic death, the immunogenicity of the death treatment may vary from one tumor to another.     

Blocking drug-induced autophagy with chloroquine in HCT-116 colon cancer cells enhances DC maturation and T cell responses induced by tumor cell lysate

Autophagy is an important mechanism for tumor escape, allowing tumor cells to recover from the damage induced by chemotherapy, radiation therapy, and immunotherapy and contributing to the development of resistance. The pharmacological inhibition of autophagy contributes to increase the efficacy of antineoplastic agents. Exposing tumor cells to low concentrations of select autophagy-inducing antineoplastic agents increases their immunogenicity and enhances their ability to stimulate dendritic cell (DC) maturation. We tested whether the application of an autophagy-inhibiting agent, chloroquine (CQ), in combination with low concentrations of 5-fluorouracil (5-FU) increases the ability of tumor cells to induce DC maturation. DCs sensitized with the lysate of HCT-116 cells previously exposed to such a combination enhanced the DC maturation/activation ability. These matured DCs also increased the allogeneic responsiveness of both CD4+ and CD8+ T cells, which showed a greater proliferative response than those from DCs sensitized with control lysates. The T cells expanded in such cocultures were CD69+ and PD-1- and produced higher levels of IFN-γ and lower levels of IL-10, consistent with the preferential activation of Th1 cells. Cocultures of autologous DCs and lymphocytes improved the generation of cytotoxic T lymphocytes, as assessed by the expression of CD107a, perforin, and granzyme B. The drug combination increased the expression of genes related to the CEACAM family (BECN1, ATGs, MAPLC3B, ULK1, SQSTM1) and tumor suppressors (PCBP1). Furthermore, the decreased expression of genes related to metastasis and tumor progression (BNIP3, BNIP3L, FOSL2, HES1, LAMB3, LOXL2, NDRG1, P4HA1, PIK3R2) was noted. The combination of 5-FU and CQ increases the ability of tumor cells to drive DC maturation and enhances the ability of DCs to stimulate T cell responses.     

肌肉免疫DC-EBV-LMP2诱导免疫应答的研究

目的探讨肌肉免疫DC-EBV-LMP2诱导的免疫效果。方法从BALB/C小鼠分离骨髓细胞,诱导培养获得小鼠DC,以100 MOI的rAd-LMP2感染获得DC-EBV-LMP2,继续培养48h,诱导DC-EBV-LMP2成熟。用免疫酶法确定LMP2在DC中表达。0,2,4周,以2×105个DC-EBV-LMP2/只免疫BALB/C小鼠,于第5,8周分别LMP2特异性水平和T细胞亚群的变化。结果结果显示,肌肉免疫DC-EBV-LMP2可诱导BALB/C鼠LMP2特异性免疫应答,且第5周强于第8周。CD8+T/CD3+T细胞亚群的比值在第5周高于对照组,而第8周低于对照组。结论 DC-EBV-LMP2肌肉免疫BALB/C鼠可诱导LMP2特异性CTL。     

DC-GPC3联合CIK 细胞的体外抗肝癌作用

摘要： 目的 探讨磷脂酰肌醇蛋白聚糖-3 （GPC3） 基因转染的树突状细胞 （DC-GPC3） 与细胞因子诱导杀伤细胞（CIK） 共培养 （DCIK-GPC3） 后, 对 CIK 的生物活性及体外抗肝癌细胞作用。方法 流式细胞术检测 DCIK-GPC3、 DC-CIK 及 CIK 各组效应细胞免疫表型, MTT 法检测各组效应细胞培养上清液中白细胞介素 （IL） -2 生物活性, 酶联免疫吸附试验 （ELISA） 检测细胞培养上清液中 IL-2、 干扰素 γ （IFN-γ） 浓度。乳酸脱氢酶释放实验分别检测各组效应细胞对肝癌 HepG2 细胞的细胞毒活性。结果 DCIK-GPC3 表面高表达 CD3+ CD8+ 和 CD3+ CD56+ 双阳性细胞, 与 DCIK 及 CIK 比较差异有统计学意义 （P＜0.05）; CIK、 DCIK、 DCIK-GPC3 培养上清液中 IL-2 生物活性、 浓度以及 IFN-γ 浓度均依次升高, 组间多重比较差异有统计学意义 （P＜0.05）; 在 20∶1 及 50 ∶1 效靶比, CIK、 DCIK、 DCIK- GPC3 对 HepG2 细胞的细胞毒活性依次升高, 组间多重比较差异均有统计学意义 （P＜0.05）。结论 CIK 与 DC- GPC3共培养可获得更强的体外杀伤肝癌细胞活性, 为DCIK-GPC3用于临床免疫治疗提供了理论和实验依据。     

Prevention of lethal tumor growth and generation of long-lasting immunity in vivo using CD137L and interleukin-12 gene transfer

In a wide range of solid tumors, overexpression of CD137L has been shown to induce tumor immunity partly due to the stimulation of CD8+ CTL, which was even increased when immunotherapy with interleukin-12 (IL12) was additionally employed. However, little in known regarding hematologic neoplasias in this respect. Of the 8 animals receiving IL12-secreting tumor cells, 2 died. Animals treated with CD137L-expressing tumor cells and the combination group, all animals survived. Interestingly, re-challenge with wild-type tumor cells was rejected by all animals in the CD137L group and all remaining animals in the IL12 group, while these in the control group died. IL12- and CD137L-transfected plasmocytoma cells prevented tumor growth and induced long-lasting immunity. Our results warrant follow-up for future clinical use in patients with myeloma.