重组病毒趋化因子vMIP对脂多糖刺激的细胞免疫功能的影响

了解重组病毒趋化因子vMIP作用前后及内毒素刺激后细胞内细胞因子IL-4和IFN-γ水平的变化,探讨vMIP对免疫功能的影响。方法:通过放射性配体－受体结合实验、ELISA法及流式CD4⁺T细胞的细胞内染色法检测外周血单个核细胞的培养上清IL-12水平及细胞内细胞因子IFN-γ及IL-4分泌水平的变化。结果:通过竞争结合细胞膜表面趋化因子受体,vMIP-II可减缓高浓度LPS引起的爆发式细胞因子IL-12、IFN-γ产生;vMIP可促进IL-12、IFN-γ和IL-4分泌。结论:病毒趋化因子vMIP-II可调节CD4⁺T细胞分泌IFN-γ和IL-4,从而下调过激的炎症反应,并对感染性休克可能有拮抗作用。     

妊娠期脂多糖接触激活体内TLR4信号通路引起胚胎脑内炎症应激

目的: 观察孕鼠腹腔脂多糖 (LPS) 注射后母体外周血单个核细胞 (PBMNC) 上Toll样受体4 (TLR4) 信号通路激活情况和胚胎脑组织中炎症性细胞因子的水平。方法: 10.5 d孕鼠腹腔注射LPS 0、3、6、12、24、48 和72 h后,通过蛋白免印迹测定孕鼠PBMNC 上TLR4、分化抗原14 (CD14)、髓样分化蛋白2 (MD-2)、p65和p50蛋白水平,Luminex 100免疫荧光法测定孕鼠血清、羊水、脑组织及胚胎脑组织细胞因子TNF-α、IL-1β和IL-10蛋白水平,实时RT-PCR测定孕鼠PBMNC和胚胎脑组织TNF-α、IL-1β和IL-10 mRNA水平。结果: LPS腹腔注射诱导激活孕鼠PBMNC上TLR4信号通路,TLR4、CD14和MD-2蛋白水平短暂增高,核因子κB (NF-κB) 激活片段p65 和p50蛋白水平增高,TNF-α、IL-1β和IL-10 mRNA水平增高(P<0.01);孕鼠外周血和羊水TNF-α、IL-1β和IL-10水平短暂增高(P<0.01),脑内IL-1β蛋白水平短暂升高(P<0.01);胚胎脑内TNF-α和IL-1β蛋白和mRNA水平显著增高(P<0.01)。结论: 妊娠期母体LPS接触可激活母体外周免疫细胞TLR4信号通路,引发胚胎脑内炎症应激状态,可能增加出生后相关疾病的发生风险。     

基于细胞因子分泌对人混合淋巴细胞反应中的T淋巴细胞进行测定和纯化

目的:对同种异体外周血单个核细胞(PBMNCs)刺激后分泌细胞因子的T 淋巴细胞进行测定和纯化,为研究介导同种异体反应的T淋巴细胞提供新的途径。方法: 利用新颖的细胞因子分泌检测方法(CKSA)从单细胞水平定量测定人混合淋巴细胞反应中分泌IFN-γ,IL-4 和IL-10的T 淋巴细胞; 对分泌IFN-γ 的T细胞进行磁性纯化。结果: 同种异体PBMNCs刺激后检测到分泌IFN-γ 的T淋巴细胞水平明显升高(1.12%±0.13%),而分泌IL-4 和IL-10的T淋巴细胞则无升高(分别为0.12%±0.03%和0.10%±0.03%);分泌IFN-γ 的T淋巴细胞可以被进一步纯化(93.8±22.1)倍。结论: 利用CKSA从单细胞水平定量测定同种异体PBMNCs刺激后分泌IFN-γ 的T淋巴细胞水平显著升高,这些细胞可以被有效地纯化。     

慢性华支睾吸虫感染对脂多糖刺激巨噬细胞反应的影响

 目的：了解慢性华支睾吸虫（Cs）感染的免疫状态及其对巨噬细胞表型和炎症反应的影响。方法：选择Sprague-Dawley雄性大鼠,按随机数字表法分组进行2部分实验。(1) 经口华支睾吸虫虫卵灌胃感染70 d建立慢性Cs感染模型,分为正常对照组和慢性Cs感染组,每组10只,用酶联免疫吸附法（ELISA）检测大鼠血清白细胞介素 4（IL-4)、IL-10、肿瘤坏死因子α（TNF-α）和干扰素γ（IFN-γ）水平,腹腔灌洗获取巨噬细胞,流式细胞术检测腹腔巨噬细胞亚型;(2)腹腔灌洗获取巨噬细胞,按照腹腔巨噬细胞的来源,分为空白对照组、正常组和慢性Cs感染组,以脂多糖（LPS,10 μg/L）刺激孵育,用ELISA法动态监测LPS刺激后0、2、12和24 h细胞培养上清液的TNF-α和IL-10的变化。结果：(1) 慢性Cs感染组大鼠血清促炎因子TNF-α［(77.64±3.25) ng/L］和IFN-γ［(212.69±12.60)  ng/L］水平较正常组TNF-α［(55.13±3.25) ng/L］和IFN-γ［(108.15±10.49)  ng/L］升高（均P＜0.05）,而抗炎因子IL-4［(248.24±8.99) ng/L］和IL-10［(223.56±5.60) ng/L］水平较正常组血清IL-4［(52.40±3.97) ng/L］和IL-10［(60.18±5.36) ng/L］也显著升高（均P＜0.01）,并可使腹腔巨噬细胞向替代活化型（M2型）巨噬细胞分化;(2) 2组腹腔巨噬细胞培养上清液TNF-α水平在LPS刺激后2 h即开始上升,至24 h达到高峰,慢性Cs感染组巨噬细胞在LPS刺激后2、12和24 h上清液的TNF-α水平均显著低于正常大鼠组［2 h： （88.20±1.91） ng/L vs（123.45±2.98） ng/L;12 h：（123.66±4.31） ng/L vs（161.11±7.38） ng/L;24 h：（154.52±4.83） ng/L vs（227.85±10.67） ng/L,均P＜0.05］,而IL-10的水平较正常组升高［2 h：（105.46±12.28） ng/L vs（80.86±2.28） ng/L;12 h：（194.19±8.62） ng/L vs（117.56±8.02） ng/L;24 h：（280.02±11.31） ng/L vs（168.14±8.97） ng/L,均P＜0.05］。结论：慢性Cs感染时宿主血清的促炎因子升高,而抗炎因子升高得更明显,使巨噬细胞向M2型极化;体外实验表明慢性Cs感染宿主的巨噬细胞对LPS刺激产生耐受。     

TNFR-Fc减轻LPS所致小鼠ALI炎症反应损伤

目的: 评价肿瘤坏死因子受体-Fc融合蛋白(TNFR-Fc)能否有效下调炎症反应而减轻急性肺损伤(ALI)小鼠的肺组织破坏。方法: 小鼠随机分为脂多糖(LPS)组、TNFR-Fc+LPS组和对照组。气管内滴入LPS复制ALI小鼠模型,TNFR-Fc组在滴入LPS前24 h腹膜腔注射TNFR-Fc (0.4 mg/kg),在滴入LPS后2 h收集标本,检测肺湿/干重、肺泡蛋白含量与肺组织病理评分;ELISA法检测血清TNF-α浓度及检测肺泡灌洗液与血清IL-1β、IL-6、IL-10与IFN-γ浓度。结果: TNFR-Fc显著降低血清TNF-α浓度(P＜0.05),轻度降低肺湿/干重比例,显著降低BALF蛋白浓度(P＜0.05),显著降低ALI评分数值(P＜0.05)。TNFR-Fc显著降低致炎症细胞因子IL-6在BALF(P＜0.05)与血清(P＜0.05)中的浓度,轻度提高BALF中IL-10浓度(P＞0.05),但其差异不显著,亦能显著提高血清IL-10浓度(P＜0.05)。IL-1β与IFN-γ水平处理前后变化不显著。结论: TNFR-Fc中和ALI中过度表达的TNF-α,下调以IL-6为代表的炎症反应,减轻ALI的肺组织破坏。     

地塞米松和IL-10对hPBMC促炎细胞因子产生和核转录因子活化的影响

目的:观察地塞米松 (Dex)和白细胞介素 (IL)-10对培养的经脂多糖 (LPS)刺激的人外周血单个核细胞 (hPBMC)释放促炎细胞因子肿瘤坏死因子 (TNF)-α、IL-6及对转录因子核因子-κB(NF-κB)、活化蛋白-1(AP-1)、cAMP反应元件结合蛋白 (CREB)活化的影响。方法:用LPS刺激分离培养的hPBMC,分为正常对照组、LPS刺激组、IL-10和Dex干预组。ELISA法检测培养上清中TNF-α、IL-6含量。凝胶电泳迁移率改变分析法 (EMSA)检测核提取物中NF-κB、AP-1、CREB活性。结果:LPS刺激1h后TNF-α含量显著增加,Dex和IL-10干预后TNF-α含量增加被显著抑制;IL-6含量在LPS刺激后12h显著增加,Dex和IL-10显著抑制IL-6的产生;LPS刺激12h后IL-10含量显著增加,Dex对IL-10产生没有明显影响。LPS刺激1h后NF-κB、AP-1、CREB的DNA结合活性显著增加,Dex和IL-10显著抑制以上三种核因子的活性,但Dex对AP-1、CREB活性的抑制作用强于IL-10。结论:LPS诱导hPBMC释放多种促炎和抗炎细胞因子的产生,并诱导多种转录因子的活化;Dex、IL-10能抑制上述促炎细胞因子的产生和转录因子的活化。Dex对AP-1、CREB活性的抑制作用强于IL-10。     

哮喘患者外周血DC参与Th2型偏移

体外诱导和扩增树突状细胞(DC)并从形态学、细胞超微结构、特异性表面标志、分泌的细胞因子和混合淋巴细胞反应等五方面予以鉴定并研究其在哮喘中的生物学功能。采用正常人外周血单个核细胞(PBMC)经贴壁去除悬浮细胞,加入细胞因子(IL-4、GM-CSF)培养7 d后,LPS刺激其成熟。通过形态学观察、特异性表面标志、分泌细胞因子IL-12的能力及混合淋巴细胞反应予以鉴定,ELISA法检测DC分泌的细胞因子IL-12以及与自身T细胞反应后,流式细胞术检测T细胞分泌的胞内细胞因子IL-4和IFN-γ水平。结果显示正常人外周血诱导的DC具有典型的树突状突起和超微结构,高表达特异性表面标志物CD1a和CD83,分泌细胞因子IL-12以及很强的促进T细胞增殖功能。DC诱导培养第8天,哮喘组DC分泌的IL-12水平低于正常对照组,差异有显著性意义(P<0.01);混合培养第7天,哮喘组IFN-γ水平低于正常对照组(P<0.05),而IL-4和IL-4/IFN-γ比值均高于正常对照组,有显著性差异(P<0.01)。因而PBMC经细胞因子的序贯培养,可获得高纯度、功能性的DC,且该DC能通过调节IL-12的分泌在哮喘发病机制中发挥重要作用,为DC在肿瘤免疫、感染免疫、抗移植排斥等方面的研究奠定了基础。     

IL-15和TGF-β对人PBMC上LAIR-1表达的调节作用

目的:研究细胞因子IL-15和TGF-β对人外周血单个核细胞(PBMC)上LAIR-1表达的调节作用.方法:以IL-15和TGF-β作用于人PBMC,流式细胞术(FCM)检测PBMC上白细胞相关免疫球蛋白样受体1(LAIR-1)的表达.结果:与单独PHA刺激组相比,IL-15刺激72 h后细胞免疫荧光强度明显减弱(P<0.05),阳性细胞百分率也有所下降;TGF-β刺激的PBMC上LAIR-1表达水平也有所降低.结论:IL-15和TGF-β都可以下调PHA活化PBMC上LAIR-1的表达.     

丙戊酸钠对人外周血T淋巴细胞细胞因子表达的影响

目的: 研究丙戊酸钠(VPA)对人外周血T淋巴细胞的活化、凋亡及细胞因子表达的影响。方法: 双色荧光抗体染色结合流式细胞术分析VPA对多克隆刺激剂二丁酸佛波酯(PDB)和离子霉素(Ion)刺激下的人外周血T细胞CD69表达的影响,DiOC₆(3)染色检测VPA对T细胞凋亡的影响。 利用胞内细胞因子染色检测T细胞IL-2、IL-4、IFN-γ和TNF-α的表达,以探讨VPA的保护机制。 结果: VPA (1和5 mmol/L)对PDB和Ion诱导的人外周血T细胞CD69的表达具有明显的促进作用 (P<0.01)。DiOC₆(3)染色结果表明VPA(1和5 mmol/L)可以增强线粒体膜电势,抑制T细胞活化诱导的凋亡,高浓度则作用相反。胞内细胞因子染色分析显示,VPA在低浓度时能明显促进IL-2表达而高浓度时则抑制。同时,VPA能显著促进IFN-γ和TNF-α的表达(P<0.05),并呈剂量依赖性,而对IL-4表达的影响较小。结论: VPA对多克隆刺激剂诱导的人外周血T细胞的活化和凋亡具有双向调节作用,诱导IL-2、IFN-γ和TNF-α的表达。     

尘螨诱导新生儿脐血单个核细胞ICOS与转录因子表达的研究

为了解尘螨(HDM)抗原对新生儿脐血单个核细胞(CBMC)及成人外周血单个核细胞(PBMC)CD3+ICOS+细胞阳性率、转录因子T-bet、GATA-3、Foxp3 mRNA表达水平以及培养上清中IL-4、IL-10、IFN-γ表达水平的影响。用流式细胞术,检测新生儿CBMC、成人PBMC体外经PHA和/或HDM抗原刺激前、后CD3+ICOS+细胞阳性率;用RT-PCR法检测细胞体外经PHA和/或HDM抗原刺激前、后T-bet、GATA-3以及Foxp3 mRNA表达水平;用ELISA法,检测细胞在体外经PHA和/或HDM刺激前、后培养上清液中IL-4、IL-10、IFN-γ表达水平。结果表明,高剂量HDM抗原显著下调CBMC经PHA刺激后的CD3+ICOS+阳性率(P<0.05),同时也显著上调PHA刺激前其T-bet mRNA表达(P<0.05),而显著下调该类细胞经PHA刺激后的Foxp3 mRNA的表达(P<0.05)。也显著增加其PHA刺激前的IFN-γ分泌(P<0.01),减少其PHA刺激后IL-10分泌(P<0.05)。高剂量HDM抗原对CBMC的作用强于PBMC,可下调CD3+ICOS+阳性率,显著上调PHA刺激前CBMC T-bet mRNA表达,增加PHA刺激前IFN-γ的分泌,减少PHA刺激后IL-10分泌,提示早期接触高剂量HDM抗原对机体免疫功能的影响较强,可促进新生儿Th1样反应,高剂量HDM抗原可能通过作用于下调Foxp3 mRNA的表达而下调CD4+CD25+调节性T细胞的功能。     

Immunophenotypic and functional characterization of cord blood dendritic cells

Dendritic cells (DCs) play a pivotal role in the activation of T cells, which are effector cells in graft-versus-host disease (GVHD). A low incidence of GVHD following cord blood (CB) transplantation has long been reported; despite this, little information is currently available on the characteristics of CB DCs. The goal of the present study was to investigate the immunophenotypic characteristics and distribution of CB DCs and their subsets. For that purpose we have analyzed 15 CB samples as compared to normal peripheral blood (PB) (n = 7) and blood from patients submitted to an allogeneic PB stem cell transplantation (allo-PBSCT) (n = 6). Our results show an overall decreased frequency of DCs in CB due to the presence of significantly lower numbers of CD123inter./CD33inter./CD16+ DCs. Phenotypically, CB DCs displayed a tendency to express lower levels of the gamma-chain interleukin-2 (IL-2) receptor (CD132) and of the CD86 co-stimulatory molecule, supporting a higher degree of immaturity for CB as compared to PB DCs. After activation of CB DCs with lipopolysaccharide (LPS) and interferon-gamma (IFN-gamma) higher frequencies of cytokine-producing cells were found among CD123inter./CD33inter./CD16+ and CD123dim/CD33bright/CD16- DCs; however, when only the cytokine-producing DCs were considered, a significant decrease in the amount of different cytokine (e.g., IL-1beta and IL-6) produced per cell was observed especially for CD16+ CB DCs. These findings support a higher degree of immaturity for CB as compared to PB DCs that might contribute to explain, at least in part, the low incidence and severity of GVHD observed after CB transplantation.     

母-胎免疫调节机制在妊娠高血压综合征病理过程中的作用

目的：分析妊娠高血压综合征（PIH）患者外周血中免疫细胞因子水平变化及滋养层细胞中免疫相关转录因子的基因、蛋白表达情况,探讨母 胎免疫调节机制在妊娠高血压综合征病理过程中的作用。方法：纳入PIH患者50例作为观察组,选择同期分娩的正常妊娠妇女40例作为对照组。ELISA法检测两组孕妇外周血中IFN-γ、IL-4、IL-17及TGF β水平;实时荧光定量PCR（RT-qPCR）法和蛋白质印迹法（Western blot）分别测定两组孕妇胎盘滋养层细胞中转录因子T-bet、GATA-3、RORC、Foxp3的mRNA及蛋白表达情况。结果：①观察组外周血中IFN-γ和IL 17水平明显高于对照组,TGF β水平明显低于对照组（P＜0.05）;两组间IL 4水平无明显差异（P＞0.05）;观察组IFN-γ/IL-4、IL-17/TGF β比值均明显大于对照组（P＜0.05）。②与对照组比,观察组T bet、RORC的mRNA及蛋白表达水平均显著升高（P＜0.05）,而GATA 3、Foxp3的mRNA及蛋白表达水平均显著降低（P＜0.05）,T-bet/GATA-3及RORC/Foxp3比值均显著增大（P＜0.05）。结论：PIH具有明显的Th1/Th2及Th17/Treg比例失衡现象,其病理机制可能与Th细胞介导的母 胎免疫耐受机制功能紊乱有关。     

FXR通过调节促甲状腺素胚胎因子减轻Con A诱导的自身免疫性肝炎病变

 目的：观察法尼酯衍生物X受体（farnesoid X receptor,FXR)-促甲状腺素胚胎因子（thyrotropin embryonic factor,TEF）通路在自身免疫性肝炎模型小鼠肝损害中的作用,探讨FXR-TEF通路改善自身免疫性肝炎的部分可能机制。方法：检测FXR在伴刀豆球蛋白A (concanavalin A, Con A) 诱导的肝炎（Con A-induced hepatitis, CIH）小鼠肝脏的表达;检测FXR激活对TEF表达的影响;观察C57BL/6小鼠和鹅去氧胆酸（chenodeoxycholic acid,CDCA）激活FXR的CIH小鼠肝脏病理、肝脏酶学及炎症因子变化。结果：FXR在CIH小鼠中低表达;CDCA激活FXR的C57BL/6小鼠TEF表达上调;FXR被激活的CIH小鼠的肝损害较轻,FXR激活可减轻肝脏炎症因子释放。结论：CDCA激活FXR能减轻CIH引起的肝功能损害和炎症反应。FXR激活使TEF上调。FXR可能是自身免疫性肝炎的保护因素,其保护作用可能是通过TEF来实现的。激活FXR可能成为治疗自身免疫性肝炎的一个途径。     

Double umbilical cord blood transplantation

Unrelated umbilical cord blood (UCB) is an alternative donor source for allogeneic haematopoietic cell transplantation and, compared with unrelated donor bone marrow, has the advantages of rapid availability, greater tolerance of HLA disparity and lower incidence of severe graft-versus-host disease. Graft cell dose is an important determinant of haematopoietic recovery and overall outcome following UCB transplantation, and the limited cell dose of single UCB units has been a major barrier to its more widespread use. Transplantation with two unrelated UCB units is feasible, safe and effective and can overcome the limitation of cell dose of single UCB units.     

Cytokine-enhanced mixed lymphocyte reaction (MLR) in cord blood

Although in cord blood (CB) transplantation graft-versus-host disease (GVHD) is reported to be less severe, GVHD may occur even in patients with HLA-identical sibling donors. This result shows that HLA typing can not entirely predict GVHD. The standard MLR with CB cells was either normal or slightly reduced compared with adult peripheral blood (PB) cells. We used two manipulations to increase the responses of CB cells to allo-antigens. The first was to treat the stimulator cells with cytokines, and the second to amplify weak proliferative responses by adding exogenous cytokines to MLR cultures (modified MLR). The stimulator cells were treated with both interferon-gamma (IFN-γ) and IL-4. The responder cells were treated with both IL-2 and tumour necrosis factor-alpha (TNF-α). It is still to be determined whether or not this cytokine-enhanced MLR could be a possible predictor of GVHD. However, using these cytokines, 90% of CB could recognize allo-antigens, even if the standard MLR was negative.     

PbGPI16在C57BL/6小鼠脑疟发病过程中作用的研究

目的：PbANKA原虫PbGPI16在小鼠实验性脑疟（ECM）发生和发展过程中的作用。方法：采用pbgpi16基因敲除的PbANKA原虫（△pbgpi16）和PbANKA原虫（WT）感染C57BL/6小鼠建立ECM模型。动态监测原虫血症和生存期;HE染色检测ECM小鼠脑组织炎性细胞浸润。qPCR观察感染后小鼠脑组织中CXCL9、CXCL10和CXCR3及脾细胞中TNF-α、IFN-γ和IL-1β转录水平。ELISA检测血清和脾细胞培养上清中TNF-α、IFN-γ和IL-1β表达水平。FACS检测感染后小鼠脾脏DCs细胞MHCⅡ和TLR4表达水平。结果：与WT组相比,△pbgpi16感染C57BL/6小鼠脑微血管壁损伤减轻,CXCL9、CXCL10、CXCR3、TNF-α、IFN-γ和IL-1β转录水平,小鼠血清和脾细胞培养上清中TNF-α、IFN-γ和IL-1β表达水平和脾DCs表达MHCⅡ及TLR4数量均显著下降（P<0.05）。结论：PbGPI16缺失通过减轻小鼠脑组织中趋化因子和脾脏中前炎症细胞因子转录水平,降低血清和脾细胞中前炎症细胞因子表达水平,降低DCs活化水平而抑制ECM发生。本研究旨在为疟疾感染后脑疟病理研究提供理论基础。     

Measuring angiogenic cytokines, circulating endothelial cells, and endothelial progenitor cells in peripheral blood and cord blood: VEGF and CXCL12 correlate with the number of circulating endothelial progenitor cells in peripheral blood

Circulating endothelial cells (CECs) and endothelial progenitor cells (EPCs) are thought to play an important role in the vascularization of damaged tissues and cancers. These cells are also required for tissue-engineered blood vessels and to help skin substitutes revascularize more efficiently. A standard approach to the phenotyping and enumeration of CEC and EPC is key to the development of new therapies, and the identification of biomarkers within the blood that regulate their levels may be important for the treatment of cancer. We have devised an improved multiparameter flow cytometric assay for CEC and circulating EPC enumeration. This assay uses antibodies recognizing CD133 and CD34 to identify EPC and CEC, respectively, and incorporates specific markers CD144 and vascular endothelial growth factor receptor 2 (VEGFR-2) for both CEC and EPC cells. In peripheral blood (PB), mean CEC numbers were 55 +/- 95 mL(-1) and mean EPC numbers were 44 +/- 58 mL(-1) (n = 60). We also found a significant correlation of both plasma VEGF (r = 0.90, p < 0.001) and CXCL12 (r = 0.84, p < 0.001) with EPCs, but not CECs. The cytokines also correlated with each other (r = 0.85, p < 0.001). In umbilical cord blood (UCB) we found on average 13 times more CEC (719 +/- 338 mL(-1)) and 7 times more EPC (299 +/- 245 mL(-1)) than in PB. However, serum VEGF and CXCL12 levels in UCB did not correlate with either EPC or CEC numbers. These results suggest a major role for VEGF and CXCL12 in the control of marrow-derived EPCs in adult PB and provide normal data for comparison with patient populations.     

脐血单个核细胞移植治疗失代偿期肝硬化

背景：原位肝移植是目前治疗终末期肝病的最有效手段,但是供肝来源匮乏、免疫排斥、无法有效控制反复感染等问题限制了其应用。干细胞移植技术的应用为该病种的治疗提供了新的思路和研究方法,许多研究证实可以通过各种不同的方法在体外成功诱导脐血来源的间充质干细胞向肝细胞转化。 目的：探讨人脐血单个核细胞移植治疗失代偿期肝硬化的临床疗效及可行性。 方法：异体人脐血单个核细胞移植治疗23例肝硬化失代偿期患者,检测移植后2,4,8,24周的血清丙氨酸氨基转移酶、白蛋白、胆碱酯酶、总胆红素和凝血酶原时间,并观察患者临床症状体征改善情况以及不良反应。 结果与结论：人脐血单个核细胞移植后2周,肝功能各项指标较治疗前无明显改善(P > 0.05);移植后4周,谷丙转氨酶有显著改善(P < 0.05)、其余指标无明显改善;移植后12周肝功能各项指标均有改善(P < 0.05),且肝脏硬度有所改善(P < 0.05);移植后24周各项指标有显著性改善(P < 0.01)。移植后4周时患者临床症状有明显改善,20例乏力好转(87%)、21例食欲改善(91%)、19例腹水减轻(83%);所有患者移植期间及治疗后随访24周无严重不良反应。结果显示异体人脐血单个核细胞移植治疗肝硬化失代偿期患者临床疗效肯定,安全性好,可作为中晚期肝硬化患者的临床治疗手段。     

High expression of NKG2A/CD94 and low expression of granzyme B are associated with reduced cord blood NK cell activity

Human umbilical cord blood （CB） has recently been used as a source of stem cells in transplantation. NK cells derived from CB are the key effector cells involved in graft-versus-host disease （GVHD） and graft-versus-leukemia （GVL）. It was reported that the activity of CB NK cells was lower than that of adult peripheral blood （PB） NK cells. In this study, we analyzed the expression of some NK cell receptors and cytotoxicity-related molecules in CB and PB NK cells. The expressions of activating NK receptors, CD16, NKG2D and NKp46, did not show significant difference between CB and PB NK cells. But the expression of inhibitory receptor NKG2A/CD94 was significantly higher on CB NK cells. As to the effector function molecules, granzyme B was expressed significantly lower in CB NK cells, but the expressions of intracellular perforin, IFN-γ, TNF-α and cell surface FasL and TRAIL did not show difference between CB and PB NK cells. The results indicated that the high expression of NKG2A/CD94 and low expression of granzyme B may be related with the reduced activity of CB NK cells.