HL—60细胞产生的肿瘤免疫抑制因子对T细胞的作用及其生物学特性

白血病细胞培养上清液和白血病人血清能抑制PHA—P诱导的人外周血T淋巴细胞的增殖;抑制白细胞介素2(IL—2)的产生和反应性。以正常2BS人胚肺细胞培养上清液和正常人血清作对照则无抑制作用。白血病细胞培养上清液无细胞毒作用。聚丙烯酰胺凝胶电泳(PAGE)结果表明,来源HL—60人早幼粒白血病细胞的肿瘤免疫抑制因子(tumor-derived immunosuppressive factor,TDSF)的分子量约为87KD,其化学本质为蛋白质。抗急非淋白血病药物对这种TDSF的分泌有部分抑制作用。     

人胃癌细胞产生免疫抑制因子作用研究

检测了３株分化不同的人胃癌细胞ＭＫＮ－４５、ＭＫＮ－２８，ＳＧＣ－７９０１在体外培养过程中产生免疫抑制因子的体外免疫抑制作用，分化差的ＭＫＮ－４５及源于转移性ＳＧＣ－７９０１胃癌细胞株体外培养过程中免疫抑制因子对正常人外周血单个核细胞（ＰＢＭＣ）产生ＩＬ－２水平及其ＩＬ－２Ｒ表达抑制作用较强，且显著高于高分化ＭＫＮ－２８细胞株产生免疫抑制因子的作用；而正常ＲＰ－ＭＩ １６４０细胞培养液无免疫抑制作     

宫颈癌细胞产生的免疫抑制因子对IL－2作用的影响

人宫颈癌细胞产生的免疫抑制因子（ＴＤＳＦ）作用于人外周血单个核细胞（ＰＢＭＣ）６ｈ，即可抑制白细胞介素２（ＩＬ－２）产生，与对照组相比，Ｐ＜０．０１。当ＴＤＳＦ存在时，经ＰＨＡ－Ｐ驯化的ＰＢＭＣ效应细胞对外源性ＩＬ－２反应显著减弱，表明ＴＤＳＦ能抑制ＩＬ－２的作用。ＰＨＡ－Ｐ刺激ＰＢＭＣ增殖，但ＴＤＳＦ使其增殖抑制。表明ＴＤＳＦ能抑制ＩＬ－２产生及其作用；抗癌药对ＴＤＳＦ的分泌有部分阻抑作用。     

宫颈癌细胞产生的免疫抑制因子对IL－2作用的影响

人宫颈癌细胞产生的免疫抑制因子（ＴＤＳＦ）作用于人外周血单个核细胞（ＰＢＭＣ）６ｈ，即可抑制白细胞介素２（ＩＬ－２）产生，与对照组相比，Ｐ＜０．０１。当ＴＤＳＦ存在时，经ＰＨＡ－Ｐ驯化的ＰＢＭＣ效应细胞对外源性ＩＬ－２反应显著减弱，表明ＴＤＳＦ能抑制ＩＬ－２的作用。ＰＨＡ－Ｐ刺激ＰＢＭＣ增殖，但ＴＤＳＦ使其增殖抑制。表明ＴＤＳＦ能抑制ＩＬ－２产生及其作用；抗癌药对ＴＤＳＦ的分泌有部分阻抑作用。     

肺癌患者的免疫抑制

肺癌的发生、发展及预后与免疫功能密切相关。许多研究证实 ,肺癌患者的免疫功能处于抑制状态。本文将近年来有关免疫抑制方面的研究作一综述。1　细胞免疫抑制1.1　淋巴细胞免疫抑制在 T淋巴细胞亚群中 ,(CD 4 (Th/ TI)具有辅助和诱导功能 ,CD 8(Ts/ Tc)具有抑制和细胞毒功能。 CD4/ CD8比值的动态平衡反映机体的免疫状态。 Marino P等报道 ,肺癌患者 CD 3、 CD 4 、 CD4/ CD8显著低下 ,CD8明显升高 〔1〕。Wesselius L J等也报道晚期肺癌总淋巴细胞、CD 4 、CD 8的绝对值和百分比明显减少 〔2〕。国内在这方面也做了…     

扁桃体淋巴细胞分泌IL-2抑制因子的研究

<正> 白细胞介素-2(IL-2)的抗肿瘤作用已有许多动物实验和临床应用结果证实。自1988年6月以来,我们试用以人体扁桃体淋巴细胞经培养产生的天然IL-2(N-IL-2)治疗晚期肿瘤患者取得了较好的效果。在     

肿瘤免疫抑制因子对人T细胞功能的影响及其机理探讨

本文观察了数种瘤株培养上清对人T细胞的增值、IL—2的产生及其反应性的影响,并就其机理进行了初步探讨。结果表明:各种来源的TDSF对上述反应均有强烈的抑制作用。共培试验结果提示,抑制性细胞亚群的活化可能是TDSF发挥抑制作用的重要机理之一。TDSF作用十分强烈,这是应用IL—2等对肿瘤进行过继性免疫治疗时应该注意的问题。     

Effect of a Soluble Factor Secreted From Cultured Human Trophoblast Cells on In Vitro Lymphocyte Reactions

ABSTRACT: The immunoregulatory role of trophoblast cells in cell-mediated immunity was investigated. Trophoblast cells were obtained from 8–10-week human placentae by treatment with collagenase followed by differential centrifugation. The cells were cultured for 48 hr, and the culture supernatant was examined for immunosuppressive activity in vitro. The supernatant when added to cultures of peripheral blood lymphocytes from healthy donors suppressed both their reactivity to different lectins (PHA and PWM) and their activity in one-way mixed lymphocyte reaction. The degree of suppression was dose-dependent. Furthermore, the supernatant was able to reduce the natural killer cell activity against K562 target cells. On the other hand, the supernatant had no inhibitory effect on the effector phase of lymphocyte-mediated cytotoxicity activity against tumor cell lines RPMI 8866 and Daudi. In all cases, the suppression observed was not due to lymphocytotoxicity or tumor cell mortality. The results indicate that trophoblast cells release a soluble suppressive factor that is a potent inhibitor of cell-mediated immunity.     

普鲁卡因抑制肺癌细胞生长和运动的机制研究

目的 探索普鲁卡因抑制ERK1/2和p38 MAPK的磷酸化对肺癌细胞A549生长和运动的影响.方法 将对数生长期细胞分为对照组、普鲁卡因组、阳性对照组、ERK1/2组、p38 MAPK组、普鲁卡因+ERK1/2组和普鲁卡因+p38 MAPK组.检测各组细胞生长、侵袭和迁移;Western印迹检测Caspase-3、E...     

转染Elafin对百草枯诱导的肺泡上皮凋亡的影响

目的:探讨转染Elafin对百草枯(Paraquat,PQ)诱导的肺泡上皮凋亡的影响及可能机制。方法:电穿孔法转染p EGFP-C1-Elafin进入A549细胞,培养24 h后,RT-PCR检测Elafin mRNA在A549细胞中的表达情况;并给予生理盐水、不同浓度PQ(5、50、100μmol/L)作用后,Annexin V/PI双染法流式细胞仪检测A549细胞凋亡率、活性氧类物质(Reactive oxygen species,ROS)含量。Western blot检测核因子相关因子2(Nuclear factor erythroid like-2,Nrf2)、血红素加氧酶-1(Heme oxygenase-1,HO-1)表达情况。结果:转入A549细胞Elafin成功表达。PQ呈浓度依赖性导致A549细胞凋亡;PQ可使ROS含量明显增加,Nrf2、HO-1表达下调。Elafin可抑制PQ诱导的细胞调亡,上调Nrf2、HO-1蛋白表达。结论:Elafin可以一定程度抑制PQ诱导的A549细胞凋亡,其机制可能与其上调抗氧化蛋白Nrf2等有关。     

泰素帝对肺腺癌细胞A549凋亡及Survivin表达和Caspase-3活性的影响

目的探讨泰素帝对肺腺癌细胞A549凋亡,生存素(Survivin)表达和Caspase-3活性的影响。方法体外细胞培养,待细胞生长处于对数期时,加入不同浓度泰素帝,MTY比色法检测细胞活性。参考MTT结果,选取100ng/ml泰素帝处理A549细胞。透射电镜,流式细胞术检测细胞凋亡的发生;RT-PCR检测Survivin mRNA的表达;Western印迹法检测Survivin蛋白质的表达;Caspase-3活性检测试剂盒检测Caspase-3活性。结果泰素帝可抑制A549细胞生长,诱导细胞凋亡,呈时间依赖性降低Survivin的表达,增强Caspase-3酶活性。结论 100ng／ml泰素帝可诱导A549细胞凋亡,Survivin表达降低和Caspase-3活性增强可能是其诱导肺腺癌细胞凋亡的分子途径之一。     

I. hepatitis E virus (87A strain) propagated in A549 cells

A strain of hepatitis E virus (HEV), the 87A strain isolated in 2BS cells from the feces of a patient with hepatitis E, has been reported previously. In this study, the 87A strain was propagated in A549 cells, and the marked cytopathic effect (CPE) appeared in the infected monolayer cells. The size of this virus is about 30 nm in diameter. Furthermore, HEV-RNAfrom the supernatants of the virus of different passages was detected by polymerase chain reaction (PCR) amplification using ET1 .1 HEV primers. A band of HEV for 239 bp from PCR products was revealed by electro-phoresis. PCR products of the fourth passage were sequenced. These results show that the 87A virus replicates in the A549 cell line. © Wiley-Liss, Inc.     

Production of Five Human Lymphokines (GranulocyteMacrophage Colony Stimulating Factor,Interferon-γ, Interleukin 2, Macrophage Cytotoxicity Factor and Macrophage Migration Inhibitory Factor) from Con A Stimulated Lymphocyte Cultures in Bioreactors

Cultivation parameters for the production of five lymphokines, granulocyte-macrophage colony stimulating factor (GM-CSF), interferon-y (IFN-γ), interleukin 2 (IL-2), macrophage cytotoxicity factor (MCF), and macrophage migration inhibitory factor (MIF) from human spleen cells or peripheral blood lymphocytes were optimized. Cultivation was done in bioreactors containing up to 200 ml of medium, usually serum-free. The reactors were equipped with surface aeration facilities, stirrers and oxygen electrodes.Whereas stirring speed alone did not influence the yields of lymphokines, good aeration was especially beneficial for high IL-2 yields. However, all lymphokines were also produced under anaerobic conditions. The concentration of the mitogen concanavalin A was mainly critical for optimal IL-2 release. Optimal cell concentrations varied from 5 x 10₆/ml (for GM-GSF and MCF) to 10 x 10₆/ml (for IL-2 and IFN-γ). It was possible to increase the yields of individual lymphokines 3 to 10-fold per batch of lymphocytes by a reinduction procedure which involved a change of medium and mitogen every 24 hrs. Reinduction was possible up to 4 times, especially when serum was present in the culture media.