简介:目的:观察肝病患者PBMC中CD3+、CD4+、CD8+、CDl6+56+细胞亚群变化研究其在肝脏损伤中的意义。方法:流式细胞仪检测肝病患者PBMC中CD3+、CD4+、CD8+、CDl6+56广卜细胞亚群变化。结果:肝病患者除重型肝炎CD3+下降外,其他急慢性肝病组CD3+稍有上升。重型肝炎、慢乙肝活动期和急性肝炎CD4+下降而慢乙肝静止期、失代偿期肝硬化、恶性肿瘤CD4+下降不明显,而代偿期肝硬化CD4+反而上升。除肝硬化CD8+下降外,其他肝病组则上升。肝病CD4+/CD8+变化与CD4+相类似。除重型肝炎和慢乙肝CDl6+56+变化不明显,失代偿期肝硬化、急性肝炎、代偿期肝硬化和恶性肿瘤CDl6广卜56+下降。相关分析发现,肝病患者CDl6+56+与CD3+和CD4+/CD8+负相关,仅CD8+与急、慢性肝损伤指标有关。结论:PBMC中CD3+、CD4+、CD8+、CDl6+56+细胞亚群的检测在肝病的诊治应用意义有限,不宜仅单凭CD4+、CDl6+56+和CD4+/CD8+上升与否和CD8+下降与否来评判疾病和治疗效果,进一步结合其他亚群标志物可能更有利于疾病机制研制了解和疾病的诊断及治疗效果的评定。
简介:Wesynthesized(Pb,Cd)Sr2(Y,Ca)Cu2O7+x,phasesuperconductor.AftersubstitutionofPbwithBi,theBiCd1212phaseshowsnosuperconductivity.AlthoughpreviousEXAFSstudyhasshownthelocalstructureenvironmentoftheCuissimilarinbothcompounds,EXAFSresultsofBiandPbheredemonstratethatσ2ofPb-Oin-planeislargerthanthatofBi-Oinplane,whereasσ^2ofPb-OapicalissmallerthanthatofBi-O,wheraseσ^2ofPb-OapicalissmallerthanthatofBi-Oapical.TheSrshellfeaturesarealsodiffernet,itappearedthatsuperconductivityneedssomedisorder.incarrierreservoirlayer,whichisduetothesubstitutionaldefectcausedbydifferentionicradii.
简介:0引言调节性T细胞(Treg)即抑制性T细胞,具有免疫调节作用,使机体保持保护性免疫又不发生病理性免疫。效应性T细胞对免疫反应的启动和Treg对免疫反应的下调之间的失衡可导致皮肤慢性炎症或自身免疫。虽然在20世纪70年代就已描述了抑制性T细胞,但由于缺乏识别的标记,对此亚群的认识未有进展。20世纪90年代Sakaguchi等首先描述了一种天然存在于小鼠的表达CD25的CD4·T细胞。动物研究揭示此亚群细胞能抑制抗肿瘤免疫,预防多种自身免疫疾病,包括炎症性肠病和自身免疫糖尿病,并能诱导对皮肤同种移植物的耐受。其后,在人类也描述了此亚群。积累的证据提示这些细胞可能在多种皮肤病中起作用。
简介:CD40和它的血缘的ligand(CD40L)是支持inflammatory和有免疫力的回答的一双管理者。在中央神经系统(CNS),CD40在许多房间上被表示,包括脉管的endothelial房间,光滑的肌肉房间,星形细胞和microglia(大脑巨噬细胞,是最敏感的房间打字对CD40ligand作出回应)。在渗入T淋巴细胞和另外的居民CNS房间介绍的microglia和CD40L上的CD40之间的相互作用触发支持cytokines,chemokines和神经毒素的一个宽数组的生产的一系列细胞内部的发信号事件。因此,两个分子在CNS用作支持inflammatory和有免疫力的回答的放大器并且为疾病的治疗学的干预组成重要分子的目标。
简介:Usingtwo-colourflowcytometry>200antibodiessubmittedtothe8thInternationalWorkshopofHumanLeukocyteDifferentiationAntigens(HLDA8)havebeenanalyzedfortheirreactivitywithrestingandactivatedCD203c+basophils.Fourantibodieseithernon-reactiveorweaklyreactivewithrestingbasophilsexhibitedanincreasedreactivitywithbasophilsactivatedbyanti-IgE-mediatedcross-linkingofthehighaffinityIgEreceptor(FcεRI).TheseincludeantibodiesagainstCD164(WS-80160,cloneN6B6andWS-80162,clone67D2),aswellastworeagentswithpreviouslyunknownspecificitiesthatwereidentifiedasCD13(WS-80274,cloneA8)andCD107a(WS-80280,cloneE63-880).Theactivationpatternsfollowedeitherthe'CD203c-like'or'CD63-like'activationprofile.TheCD203cprofileischaracterizedbyarapidandsignificantupregulation(ofCD13,CD164,andCD203c),reachingmaximumlevelsafter5-15minofstimulation.ThePhosphoinositide-3-kinase(PI3K)-specificinhibitorWortmannininhibitedtheupregulationofthesemarkerswhereas12-O-tetradecanoyl-phorbol-13-acetate(TPA)inducedarapidandFcεRI-independentupregulationwithin1-2min.IntheCD63profile,maximumupregulation(ofCD63andCD107a)wasdetectedonlyafter20-40min,andupregulationbyTPAreachedmaximumlevelsafter60min.Insummary,ourdataidentifyCD13,CD107a,andCD164asnovelbasophil-activationantigens.Basedontimekineticsofupregulation,wehypothesizethatmoleculesofthe'CD203cgroup'andthe'CD63group'arelinkedtotwodifferentmechanismsofbasophilactivation.
简介:TheeffectofCdionsonsalmonspermDNAwasstudiedbymeansofcirculardichroism(CD),Ramanspectroscopy,X-rayphotoelectronspectroscopy(XPS)andfluorescencespectroscopy.TheCDspectralandfluorescentprobe-acriflavineresultsindicatethattheDNAunderwentaconformationchangeupontheadditionofCdions.XPSandRamanstudiesrevealthatthereexistedinteractionsbetweenCdionsandthephosphategroupsoftheDNA.Inaddition,anewbandappearedat803cm-1intheRamanspectra,whichcanbeattributedtocharacterizing"marker"bandofA-DNA.ItisconcludedthatCdionscanbecoordinatedbythephosphategroupsoftheDNAandinducetheconformationchangesoftheDNAfromB-DNAtoA-DNA.