CD4~ T Cell Apoptosis Induced by Anti-CD4 Antibodies

One of the mechanism of AIDS caused by human immunodeficiency virus (HIV) is that HIV caninduce CD4 T cells apoptosis[" 2]. Various HIV pramteins mediated CD4 molecular' cross--linking can induce CD4 T cell apoptosis and the change of multifold cell surface molecules. The effect on,CD4 Tcells induced by anti--CD4 chimeric antibodies mediated CD4 molecular cross--linking need to be furtherverified. In this study, we investigated the apOPtosisof different target cells induced by a…     

Suppression of allogeneic T cells proliferation by CD3/CD46-induced T-regulatory 1 cells

CD46 is not only identified as a complement regulatory protein which protects host cells from complement attack,but also a new co-stimulatory molecule for human T cells.CD3/CD46 co-stimulation can induce a T-regulatory 1 cell(Tr1)-specific cytokine phenotype in human CD4+ T cells.However,the role of CD46 as a co-stimulatory molecule in the modulation of the acquired immunity,such as transplant immunology,remains unclear.In this study,CD4+ T cells were isolated from human CD46-transgenic C57BL/6 mice by magn...     

Selective depletion of the allo-antigen specific T cells by Fas/FasL pathway by cytokine IFN-γ and IL-2

Summary To investigate the value of apoptosis of the allo-antigen specific T cells induced by Fas/FasL pathway in preventing graft-versus-host disease (GVHD), the CD34⁺ cells transfected with FasL or not, used as stimulus cells, were mixed with allo-antigen specific T lymphocytes in presence or absence of IFN-γ and IL-2. After 5 days, apoptosis of T cells was detected by TdT nick end mediated dUTP labeling (TUNEL) and flow cytometry (FCM). The affects of these two cytokines on CD34⁺ cells in the graft were also compared. The ratio of apoptosis of T cells was 12.1±1.5% when CD34⁺ cells transfected with FasL was used as stimulus cells, much higher than that of CD34⁺ cells non-transfected (3.2±1.1%,P<0.01). And in presence of IFN-γ or IL-2, the ratio reached 20.1±2.3%, 17.6±1.3% respectively (P<0.01). However, IFN-γ up-regulated Fas expression of CD34⁺ cells and increased the sensibility of CD34⁺ cells to soluble FasL(sFasL); IL-2 showed no such affect. It is possible to induce apoptosis of the allo-antigen specific T cells of grafts activated by allo-antigen by exogenous Fas ligand expressed on recipient cells and this might provide a new approach for preventing GVHD and IL-2 may be more suitable for clinical application. XIAO Juan, female, born in 1974, MD This project was supported by the grant from National Natural Science Foundation of China (No. 39770767).     

Shkbp1缺失对小鼠T淋巴细胞系亚群的影响

目的探讨Shkbp1缺失小鼠(Shkbp-1~(-/-))的血液、骨髓、脾脏中血液细胞分类和T细胞亚群的变化。方法采用Shkbp-1~(-/-)转基因小鼠,经PCR鉴定基因型;利用全自动血液检测仪测定血液细胞分类;采用流式细胞仪检测Shkbp-1~(-/-)和对照组小鼠血液、骨髓、和脾脏中T淋巴细胞亚群。结果血常规结果:中性粒细胞和嗜酸性粒细胞有增高趋势,且有显著差异。淋巴细胞未见显著差异。流式结果显示:对照组血液中CD4~+CD8~+双阳性细胞降低,骨髓中CD3~+、CD4~+升高。但脾脏组织中,其CD3~+、CD4~+、CD8~+、CD4~+CD8~+双阳性细胞均呈下降趋势。结论 Shkbp1参与血液细胞的成熟分化,影响了免疫细胞数量,本研究为探索Shkbp1如何参与血液细胞的分化奠定了研究基础。     

Apoptosis of Leukemia Cells Induced by CD34^＋ Cells Transferred Exogenous Fas Ligand

Summary To assess the value of CD34⁺ cells transferred exogenous Fas ligand (FasL) in inducing apoptosis of human leukemic cells, the CD34⁺ cells transfected with FasL or without, pretreated with mitomycin C, was mixed with leukemic cell line U937 cells in presence or absence of daunorubicin (DNR) or cytosine arabinoside (Ara-C). After 18 h, apoptosis of cells was detected by FCM and TUNEL. Induced for 18 h by CD34⁺ cells transfected with FasL or without, the ratio of apoptosis of U937 cells was (5.0±1.3)%, (10.8±0.6)% (P<0.01), respectively. Induced by FasL⁺CD34⁺+DNR, FasL⁺CD34⁺+Ara-C, the ratio was (13.4±1.0) % (P<0.05), (17.9±1.3)% (P<0.01), respectively. The result demonstrated that CD34⁺ cells transfected with exogenous FasL could induce apoptosis of human leukemic cells and showed a cytotoxic synergistic effect when used in combination with chemotherapeutic drugs, suggesting that it was possible to develop a new method in treatment of leukemia. XIAO Juan, Female, born in 1974, Doctor in Charge This project was supported by the grant of National Nature Science Foundation of China (Serial No. 39770767).     

小鼠CD4~+T细胞外泌体分离及鉴定

目的探讨CD4~+T细胞是否具有分泌外泌体的能力,以及CD4~+T细胞外泌体参与炎症及肿瘤免疫过程的可能。方法应用断颈处死的方法取出小鼠的脾脏,用磁珠分选的方法从小鼠脾脏细胞中分选出CD4~+T细胞,并尝试从培养基上清液中提取CD4~+T细胞的外泌体,在透射电镜下观察,后用PCR技术分析miR-23a、miR-214的表达情况。结果在透射电镜下能够观察到提取出的CD4~+T细胞外泌体,且用PCR技术能检测到小鼠CD4~+T细胞外泌体中miR-23a、miR-214这两个炎症及肿瘤相关的miRNA的表达。结论小鼠CD4~+T细胞有分泌外泌体的能力,且为CD4~+T细胞外泌体参与炎症及肿瘤相关过程提供了可能。     

Mitogenic factor for T inducer/helper cells in Entamoeba histolytica extracts

Summary In order to investigate mitogenic effect of Entamoeba histolytica extracts (EHE) on T cell subpopulations, monoclonal antibodies of the OKT system were used to separate T inducer/helper (OKT₄ ⁺) and T suppressor/cytotoxic (OKT₈ ⁺) cells. Only OKT₄ ⁺ cells were found to respond to EHE stimulation as indicated by incorporation of³HTdR into cultured cells. Determination of interleukin-2 (IL-2) activities revealed that the response of OKT₄ ⁺ cells to EHE was due to the action of IL-2.     

HIV感染者调节性T细胞消耗可导致HIV特异CD8~+细胞凋亡

目的了解在HIV感染患者CD4+CD25+FoxP3+调节性T细胞(Treg)的降低是否能够引起HIV特异CD8+细胞过度凋亡。方法本研究对75例没有治疗的HIV患者进行研究,检测其外周血中Treg细胞计数及CD8+细胞的活化及凋亡情况并分析其相关性;同时纯化Treg细胞及CD8+细胞,在体外进行共培养,用五聚体检测HIV特异CD8+细胞的活化情况。结果在HIV感染患者,Treg细胞与CD8+细胞的活化及凋亡呈负相关,Treg细胞能够抑制HIV特异的CD8+细胞的凋亡。结论 HIV感染患者Treg细胞的降低可导致CD8+细胞、尤其HIV特异CD8+细胞的凋亡增加。     

Expression and fuactional role of HERG1, K<Superscript>+</Superscript> channels in leukemic cells and leukemic stem cells

Summary In order to investigate the expression and functional role of HERG1 K⁺ channels in leukemic cells and leukemic stem cells (LSCs), RT-PCR was used to detect the HERG1 K⁻ channels expression in leukemic cells and LSCs. The functional role of HERG1 K⁺ channels in leukemic cell proliferation was measured by MTT assay, and cell cycle and apoptosis were analyzed by flow cytometry. The results showed that herg mRNA was expressed in CD34⁺/CD38⁻, CD123⁻ LSCs but not in circulating CD34⁺ cells. Herg mRNA was also up-regulated in leukemia cell lines K562 and HL60 as well as almost all the primary leukemic cells while not in normal peripheral blood mononuclear cells (PBMNCs) and the expression of herg mRNA was not associated with the clinical and cytogenetic features of leukemia. In addition, leukemic cell proliferation was dramatically inhibited by HERG K⁺ channel special inhibitor E-4031. Moreover, E-4031 suppressed the cell growth by inducing a specific block at the G1/S transition phase of the cell cycle but had no effect on apoptosis in leukemic cells. The results suggested that HERG1 K⁺ channels could regulate leukemic cells proliferation and were necessary for leukemic cells to proceed with the cell cycle. HERG1 K⁺ channels may also have oncogenic potential and may be a biomarker for diagnosis of leukemia and a novel potential pharmacological target for leukemia therapy. LI Huiyu, female, born in 1960, Associate Professor This project was supported by a grant from National Science Foundation for Distinguished Young Scholars of China (No. 30225038).     

人乳牙牙髓干细胞对干燥综合征患者CD4+T细胞的免疫抑制效应

目的 探讨在体外人乳牙牙髓干细胞(stem cells from human exfoliated deciduous teeth, SHED)及其联合IL-6抗体对干燥综合征患者(Sjgren syndrome, SS)外周血活化的CD4⁺T细胞的免疫抑制效应。方法 培养并鉴定SHED;流式细胞术检测健康者和SS患者外周血CD4⁺T细胞中Th1、Th2、Th17、Treg及Tfh的比例;将健康者和SS患者PBMC各自单独培养或与SHED共培养,ELISA法检测培养上清液中IL-6浓度,在各组中添加或不添加IL-6抗体,72h后流式细胞术检测CD4⁺T细胞增殖情况。结果 SS患者外周血CD4⁺T细胞中Th17及Tfh比例较健康者升高(P<0.05);健康者与SS患者共培养组的Th17比例显著降低(P<0.001),SS患者共培养组的Treg比例有所升高(P<0.05);在SS患者共培养组中添加IL-6抗体,可显著降低CD4⁺T细胞中Th2的比例(P<0.05)。结论 SHED可抑制SS患者CD4⁺T细胞的增殖,降低SS患者CD4⁺T细胞中Th17的比例且增加Treg的比例;IL-6抗体可降低与SHED共培养的SS患者PBMC中CD4⁺T细胞Th2亚型比例。     

嵌合锚定T细胞致癌胚抗原阳性胃癌细胞的凋亡效应

目的探讨CEA靶向性嵌合锚定T细胞的制备方法,并检测其活化功能及诱导CEA阳性胃癌细胞的杀伤活性。方法分离外周血单个核细胞（PBMC）,然后用免疫磁珠分离得到CD8^＋T细胞。将重组真核表达载体抗-CEA-scFv-CD3 zeta-pcDNA3．0采用脂质体转染上述T细胞以制备CEA靶向性的嵌合锚定T细胞;用流式细胞仪检测其CD69的表达,以检测嵌合锚定T细胞活化功能;将嵌合锚定T细胞与胃癌细胞HGC-27、SGC-7901共培养,检测后者膜联蛋白V的表达,分析嵌合锚定T细胞致胃癌细胞的凋亡效应。结果将已制备的CEA靶向性嵌合锚定T细胞培养12h、24h后,检测T细胞的活化信号CD69表达率分别为40．5％±3．4％、48．3％±2．8％,证明嵌合锚定T细胞具备活化功能。检测与嵌合锚定T细胞共培养的胃癌细胞HGC-27、SGC-7901,凋亡率分别为47．8％±4．2％、18．7％±2．8％,两者之间有统计学意义（P〈0．05）。结论CEA靶向性嵌合锚定T细胞可特异性识别CEA阳性胃癌细胞并促使后者凋亡,这种治疗策略将为胃癌的临床诊治提供一种有希单的涂释。     

评价肿瘤疫苗免疫原性的新型人免疫系统小鼠模型

人免疫系统(human immune system,HIS)小鼠大都用于评价肿瘤疫苗诱导细胞毒性T淋巴细胞(cytotoxic T lymphocyte,CTL)效应的能力,却不能准确反映肿瘤疫苗诱导体液免疫应答的能力。本研究利用密度梯度离心法分离人外周血单核细胞,与体外诱导分化的同源树突状细胞(dendritic cells,DCs)共移植到NCG小鼠中从而建立DC-HIS小鼠模型。在DC-HIS小鼠中,共移植的抗原递呈细胞(HLA-DR⁺CD11c⁺)能定植于模型小鼠脾脏;DCs共移植也显著提高了激活的人CD4⁺ T/CD8⁺ T细胞和人B细胞的比例,提示DCs-HIS小鼠能较好的模拟人体的免疫应答情况。利用所构建的DCs-HIS小鼠评价靶向HER2蛋白疫苗(NitraTh-HER2)的免疫原性,结果显示,NitraTh-HER2疫苗能够诱导HER2特异性人IgG抗体的产生,并具有显著的抗体依赖的细胞介导的细胞毒性作用(antibody-dependent cell-mediated cytotoxicity,ADCC),靶细胞SK-BR-3的裂解率达到47.1%;NitraTh-HER2疫苗能够产生抗原特异性的CTL效应,靶细胞SK-BR-3的裂解率达到14.6%。研究结果提示,DC-HIS小鼠模型为预测人类肿瘤疫苗的免疫原性提供了有效的方法。     

Changes in the level of IL-2, T cell subsets and the function of T suppressor cells in patients with schistosomiasis japonica

Summary The level of interleukin-2 (IL-2) produced by peripheral blood mononuclear cells in vitro, T cell subsets and the function of T suppressor cells (Ts) in patients with schistosomiasis japonica were investigated. It was found that the level of IL-2 induced by schistosomal antigens was significantly high and positively related to the percentage of CD4⁺ cells. In the groups of chronic and advanced schistosomiasis japonica, the level of IL-2 induced by schistosomal antigens was markedly lower than that in the group of acute schistosomiasis japonica, but significantly higher than that in the group of normal controls. The IL-2 level was negatively related to the percentage of CD8⁺ T cells and the ratio of CD4⁺/CD8⁺. The level of IL-2 induced by PHA was greatly reduced in the group of advanced schistosomiasis japonica. The changes in the level of IL-2 and its relationship with T cell subsets and the function of Ts are also discussed.     

抗CD42—鼠嵌合抗体的生物学特性及作用机理探讨

目的 比较抗ＣＤ４人－鼠嵌合抗体与鼠源性单抗在单向混合淋巴细胞反应（ＭＬＲ）和兔皮内移植物抗宿主反应（ＧＶＨＲ）中的作用，及嵌合抗体的抗体依赖性细胞介导的细胞毒（ＡＤＣＣ）和补体依赖细胞毒（ＣＤＣ）活性，以进一步探讨抗ＣＤ４嵌合抗体的增殖抑制作用机理。方法 用四甲基偶氮唑盐比色分析法检测抗ＣＤ４抗体在单向ＭＬＲ中的抑制作用。以免疫抑制剂处理后的大白兔作为ＧＶＨＲ的动物模型，对抗体的增殖抑制作用进行     

Anti-proliferative effects induced by anti-CD4 human/murine chimeric antibody and murine anti-CD4 monoclonal antibody

Summary The effects of chimeric anti-CD4 human/murine chimeric antibody and murine anti-CD4 monoclonal antibody (McAb) on the proliferation induced by anti-CD3 McAb, phytohemagglutinin (PHA), IL-2, and allogeneic cells were studied. The results showed that chimeric anti-CD4 antibody and murine anti-CD4 McAb could inhibit the proliferation induced by the above inducers and the inhibitory effects were related to the dosage of the antibodies. This project was supported by a grant from the National Sciences Foundation of China (Serial No. 39370628).     

CD4^＋CD25^high Regulatory Cells in Peripheral Blood of NSCLC Patients

The proportion and changes of CD4 CD25high regulatory T cells (Trs) in peripheral blood of non-small cell lung cancer (NSCLC) patients were analyzed and their clinical significance explored. The peripheral blood was collected from 61 patients with NSCLC and 15 healthy controls. By using monoclonal antibodies, the blood samples were evaluated with the flow cytometry for lymphocyte subsets (CD3 , CD4 and CD8 ) and CD4 CD25high Tr cells. The results showed that the proportion of CD4 CD25high Tr cells in NSCLC group was significantly higher than in control group [(4.36±2.07) % vs (2.04±1.03) %, P<0.01]. The proportion of CD4 CD25 high Tr cells in late stage was higher than that in early stage [stages I II (2.26 0.6) %; stage III (3.28 1.38) %; stage IV (6.06±4.08) %] (P<0.05). Kaplan-Meier survival analysis revealed that the prognosis of the patients who had higher proportion of CD4 CD25high Tr cells in peripheral blood was worse (P=0.0026). In conclusion, the relative increase in CD4 CD25high Tr cells in peripheral blood may be related to im-munosuppression and tumor progression in patients with NSCLC. This finding suggests that CD4 CD25 high Tr cells in peripheral blood of NSCLC may be positive for prognosis analysis. The use of depletion of the CD4 CD25high Tr cell therapy to treat NSCLC patients may be an effective strategy.     

甲状腺相关性眼病患者外周血CD4+、CD8+T细胞百分比及细胞表面程序性死亡蛋白1表达的改变及其意义

目的 观察甲状腺相关性眼病(TAO)患者外周血单个核细胞(PBMC)中CD4+、CD8+T细胞百分比及细胞表面程序性死亡蛋白1(PD-1)的表达水平,探索这两者变化在TAO发病机制及疾病诊断中的意义.方法 收集21例TAO患者、21例Graves病(GD)无眼病患者及20例健康对照者资料,采用流式细胞术检测所有受试者PBMC中CD4+、CD8+T细胞百分比及其表面PD-1的表达率,比较组间差异,分析其与患者病程、甲状腺功能、甲状腺相关抗体及TAO疾病活动性和严重程度之间的关系.结果 (1) TAO患者PBMC中CD4+、CD8+T细胞百分比分别为(35.9±14.5)％、(22.2±8.4)％,GD患者分别为(33.1±13.0)％、(18.6±9.2)％,均高于健康对照者[(17.4±7.4)％、(7.7±4.8)％,P＜0.01].(2) TAO及GD患者PBMC中CD4+T细胞表面PD-1表达率分别为(8.3±6.4)％、(28.0±26.6)％,均低于健康对照者[(52.2±28.6)％,P＜0.01.P＜0.05],且TAO患者低于GD患者(P＜0.05);TAO患者PBMC中CD8+T细胞表面PD-1表达率低于健康对照者r(12.7±13.4)％vs(38.2±24.2)％,P＜0.01].(3) TAO患者PBMC中CD8+T细胞百分比与病程呈正相关(r=0.478,P＜0.05).(4) TAO患者活动期组与非活动期组、轻度组与中重度组间CD4+、CD8+T细胞百分比及其表面PD-1表达率差异均无统计学意义(P＞0.05).结论 TAO患者PBMC中CD4+、CD8+T细胞百分比及细胞表面PD-1表达存在异常,可能参与TAO的自身免疫过程.     

Up-regulation of tim-3 expression contributes to development of burn-induced T cell immune suppression in mice

T cell immunoglobulin and mucin domain 3 (Tim-3) is well known to negatively regulate T cells responses,but its role in burn-induced T cells immune suppression remains unclear.In the present study,in o...     

流感嗜血杆菌下气道定植对哮喘小鼠肺组织TH17细胞表达及气道重塑的影响

目的 检测下呼吸道流感嗜血杆菌定植对哮喘小鼠TH17细胞的表达、气道炎症及对气道重塑的影响。方法 用卵清蛋白（ovalbumin,OVA）致敏和激发制备慢性哮喘小鼠模型,同时制作流感嗜血杆菌琼脂糖菌珠,在气道注菌之后的第1、7、21天处理小鼠,观察肺组织病理变化,流式细胞仪检测肺组织TH17细胞表达、测定CD4⁺T细胞TLR4的表达,并进行气道细菌培养和肺泡灌洗液（bronchoalveolar lavage fluid,BALF）细胞计数。结果 与正常组和哮喘非注菌组相比,哮喘注菌组有明显的哮喘症状和感染症状;病理学结果显示哮喘组气道黏膜水肿,管壁增厚,大量的炎性细胞浸润,注菌后炎症加重。哮喘小鼠气道注菌之后,随着时间的延长,气管壁厚度（WAt/Pbm）和平滑肌厚度（WAm/Pbm）均显著高于哮喘非注菌组。细菌学培养结果显示正常组第1、7天气管流感嗜血杆菌培养阳性,第21天阴性;哮喘组注菌后1、7、21天气管流感嗜血杆菌检测均阳性。流式细胞仪检测小鼠肺组织TLR4和TH17在CD4⁺T细胞的表达,哮喘组的TLR4和TH17表达均显著高于正常组,注菌之后二者表达显著增加,观察指标在哮喘注菌组变化更明显,差异有统计学意义（P<0.05）。BALF细胞计数结果显示,哮喘组BALF中细胞数明显高于正常组,注菌后细胞数进一步增多。相关性分析发现,哮喘组小鼠肺组织中CD4⁺T细胞TLR4的表达与BALF细胞总数呈正相关（r=0.746,P<0.05）,TH17表达与CD4⁺T细胞TLR4的表达、气道WAt/Pbm、WAm/Pbm和BALF细胞总数呈正相关（分别r=0.612、0.611、0.537、0.752,P<0.05）。结论 流感嗜血杆菌下呼吸道定植可以通过激活TLR4,增加哮喘小鼠肺组织TH17细胞表达,加重哮喘气道炎症和气道重塑,可能是难治性哮喘预后的重要机制之一。     

甲状腺乳头状癌中肿瘤相关巨噬细胞浸润及CD47表达的意义

目的 探讨肿瘤相关巨噬细胞浸润及CD47蛋白表达与甲状腺乳头状癌患者临床病理特征间的关系及意义.方法 收集大连市友谊医院2015—2019年间甲状腺乳头状癌手术切除标本65例,应用免疫组织化学方法检测所有标本中CD68+和CD163+肿瘤相关巨噬细胞浸润和CD47蛋白表达情况,分析肿瘤相关巨噬细胞浸润、CD47蛋白表达与甲状腺乳头状癌患者临床病理特征间的关系,以及肿瘤相关巨噬细胞与CD47蛋白表达的相关性.结果 CD68+肿瘤相关巨噬细胞阳性率为35.38％,与肿瘤体积及淋巴结转移有关(P<0.05);CD163+肿瘤相关巨噬细胞阳性率为16.92％,与癌侵犯甲状腺外组织情况有关(P<0.05).CD47蛋白阳性表达率为20.00％.CD68+和CD163+肿瘤相关巨噬细胞浸润与CD47表达均无关联(P>0.05).结论 CD68+肿瘤相关巨噬细胞可能促进甲状腺乳头状癌进展,而CD163+肿瘤相关巨噬细胞可能抑制其进展.