淋巴细胞共刺激信号和凋亡信号异常与RA免疫效应亢进的研究

目的：探究T淋巴细胞表面多种细胞信号分子所介导的细胞活化或凋亡信号在RA患者免疫功能紊乱中的作用。方法：采用流式细胞术检测RA患者外周血T细胞亚群及其表面共刺激分子cD154（cD40L）、CD30和凋亡受体CD95（Fas）的表达。结果：RA患者外周血T细胞亚群偏移，CD4^＋T细胞增加，CD8^＋T细胞减少；共刺激分子CD154在CD4^＋和CD8^＋T细胞上的表达均上调，但CD30分子的表达均降低，并以CD4^＋T细胞降低更为明显。同时，凋亡受体CD95分子在T细胞亚群上的表达均明显增加。结论：RA患者T淋巴细胞表面多种信号分子表达异常，共同导致了RA患者免疫功能紊乱。     

ICOS共刺激途径中MAPK家族信号分子对活动期SLE患者T细胞增殖及细胞因子分泌的作用

目的研究可诱导共刺激分子（ICOS）共刺激途径中丝裂原活化蛋白激酶（MAPK）家族信号分子对活动期系统性红斑狼疮（SLE）患者T细胞增殖及细胞因子分泌的作用。方法体外分离纯化活动期SLE患者和正常人外周总T细胞、CD4^＋和CD8^＋T细胞，予以抗CD3／抗ICOS刺激，通过Western blot检测信号分子的活化水平，ELISA检测培养上清细胞因子表达，^3H—TdR法测定细胞的增殖水平。结果活动期SLE病人CD4^＋或CD8^＋T细胞经ICOS共刺激后，胞外信号调节激酶（ERK）的活化水平明显低于正常人，CD4^＋或总T细胞分泌IL-2明显低于正常人，PD98059抑制ERK活化可致细胞增殖水平下降与IL-2分泌减少，SB-203580抑制p38MAPK活化可致IL-10分泌减少，细胞因子IL-2能明显促进T细胞的增殖水平。结论活动期SLE患者ICOS共刺激T细胞增殖功能降低与其ERK信号活化障碍所致的IL-2分泌减少密切相关，MAPK家族信号分子在ICOS共刺激不同T细胞亚群增殖与细胞因子分泌中具有不同的作用。     

T细胞凋亡受体和共刺激分子的表达变化与终末期肾功能衰竭患者细胞免疫功能的关系研究

目的：探究终末期肾功能衰竭患者T细胞亚群的凋亡受体CD95分子与共刺激分子CD28、CDl52（CTLA-4）的表达与细胞免疫功能的关系。方法：采用流式细胞术检测外周血T细胞的凋亡受体CD95（Fas）与共刺激分子CD28／CDl52表达。结果：终末期肾功能衰竭患者CD3^＋T细胞和CD4^＋T细胞比例明显高于健康对照组，CD4／CD8比值增加（P=0．008），CD4^＋T细胞和CD8^＋T细胞上CD95分子表达均上调（P=0．001），以CD8^＋T细胞上CD95分子增加更为明显；CD28和CD152分子在不同T细胞亚群上的表达均上调（P〈0．05），然而，CD4^＋T细胞以CD28分子表达增加为主，而CD8^＋T细胞则CD152分子表达增加为主。结论：终末期肾功能衰竭患者的细胞亚群失衡，共刺激分子CD28和CD152表达异常增加，提示T细胞活化与抑制性调节发生紊乱。T细胞亚群上凋亡受体CD95分子表达增加，以CD8^＋T细胞为主，说明终末期肾功能衰竭者淋巴细胞的减少可能通过两种途径——受体配体途径和负性共刺激分子CD152抑制信号途径，其中以CD8^＋T细胞减少为主，造成患者细胞免疫缺陷。     

SLE患者外周血T细胞亚群ICOS与CD28共表达水平与疾病的关系

目的观察系统性红斑狼疮(systemic lupus erythematosus，SLE)病人外周血CD4^ 及CD8^ T细胞表面可诱导共刺激分子(inducible co-stimulator，ICOS)及CD28共表达水平，探讨ICOS和CD28共表达水平与SLE疾病的关系。方法采用三色流式细胞术检测SLE病人(n=51)及正常人(n=30)外周血CD4^ 及CD8^ T细胞表面ICOS与CD28共表达水平，并结合SLE病人疾病活动程度、临床表现等进行分析。结果与正常人相比，SLE活动期和稳定期病人外周血CD4^ T细胞中仅表达ICOS不表达CD28(即CD28^-ICOS^ )的细胞比例明显升高，但活动期病人和稳定期病人之间并无差异；活动期病人外周血CD8^ T细胞上同时表达CD28和ICOS的细胞(即CD28^ ICOS^ 细胞)和CD28^-ICOS^ 细胞比例都明显升高；同一SLE病人在疾病活动期CD4^ 和CD8^ T细胞中CD28^ ICOS^ 的细胞比例和CD8^ T细胞中CD28-ICOS^ 细胞比例明显高于该病人经过治疗病情稳定时；初发未治疗SLE病人仅CD4^ T细胞中CD28^ ICOS^ 细胞的比例比复发病人明显升高；血清抗dsDNA抗体( )病人和血清免疫球蛋白含量(IsG、IgA和IgM中任何一种)异常升高的病人外周血CD4^ T细胞中CD28^ ICOS^ 细胞和CD8^ T细胞中CD28-ICOS^ 细胞比例分别明显高于血清抗dsDNA抗体(-)和血清免疫球蛋白含量正常的病人。结论CD28和ICOS在SLE病人外周血CD4^ 和CD8^ T细胞上共表达水平与SLE疾病的活动程度、病程及临床表现等存在一定的关联。     

重症肌无力患者外周血B7：CD28／CTLA4共刺激分子表达的动态变化

目的：研究重症肌无力（MG）患者B7：CD28／CTLA4共刺激通路相关分子表达动态变化及其与MG发病的关系。方法：用流式细胞仪检测18例MG患者和16例健康对照者外周血单个核细胞（PBMC）在经PMA（佛波酯）＋ionomycin(钙离子导入剂）刺激的0h,6h,24h,48h时B7－1、B7－2、CD28、CTLA4分子在CD4^ T细胞和CD8^ T细胞表面的表达。结果：（1）0h,MG患者B7－1、B7－2分子总体表达增加，CD4^ 、CD8^ T细胞表面B7－1、B7－2的表达未见明显增加，PMA＋ionomycin刺激后B7－1、B7－2在CD4^ 、CD8^ T细胞表面也无增加；（2）0h,CD28、CTLA4的表达增强，其中CD28^ 细胞的增多主要表现在CD4^ T细胞亚群，CTLA4的表达增强主要在CD8^ T细胞，在PMA＋ionomycin激活后，CD28表达明显增强，持续到48h都处于较高水平（与对照组相比P＜0．01），CTLA4表达出现短暂增强，6h即达高峰，以后下降，与对照组相比无显著增强（P＞0．05）。结论：MG患者外周血中B7：CD28／CTLA4通路共刺激相关分子表达增高，持续时间延长，检测共刺激分子的表达可反映机体的免疫激活状态，B7：CD28／CTLA4通路在MG发病中可能起重要作用。     

环孢菌素通过FLIP影响再生障碍性贫血患者CD8+T细胞亚群CD28的表达

目的研究共刺激分子CD28在再生障碍性贫血（AA）患者的不同T细胞亚群中的表达变化，及其与凋亡抑制蛋白FLIP的关系。方法取21例AA患者环孢菌素A（CyA）治疗前后的外周血，应用流式细胞仪检测T细胞CIMCD28、CD8CD28的表达；磁珠分选患者治疗前后外周血的CD8^＋T细胞，RT-PCR检测治疗前后FLIP、Caspase-8表达变化；分选获得的治疗前的CD8^＋ T细胞体外经CyA处理后检测其CD28、FLIP、Caspase-8的表达变化。结果AA患者的CD8^＋ CD28^＋ T细胞的比例较正常人显著升高，治疗有效者该亚群的细胞比例在治疗后趋于正常；患者CD8^＋ T细胞的FLIP表达显著上调，但Caspase-8的表达无明显变化；CyA能下调患者CD8^＋T细胞的FLIP的表达。结论AA患者CD8^＋CD28^- T细胞亚群比例升高与FLIP表达增加有关，CyA能抑制FLIP的表达，降低CD8^＋CD28^-T细胞的比例。     

CD226在系统性红斑狼疮患者T淋巴细胞亚群上的表达

目的：研究CD226在SLE患者外周血T淋巴细胞亚群上的表达，以阐明CD226抗原在SLE患者体内T细胞活化中作用以及与SLE发病的关系。方法：31例SLE患者和30例健康志愿者外周血单个核细胞，在体外培养72h后，三色荧光标记的单克隆抗体染色，利用流式细胞仪测定T细胞亚群细胞表面CD226抗原的表达。结果；SLE患者组的CD3^ 、CD4^ 、CD8^ T淋巴细胞上CD226^ 表达均高于正常对照组（P＜0．01）；活动期SLE组、静止期SLE组的CD3^ 、CD4^ 、CD8^ T细胞上CD226^ 表达均显著高于对照组（P＜0．01），而活动期与静止期患者之间T细胞亚群上CD226^ 表达则无显著性差异（P＞0．05）。SLE患者CD3^ 、CD4^ 、CD8^ T细胞CD226^ 抗原表达水平与SLEDAI之间无明显相关性（P＞0．05）。结论：SLE患者体内存在T细胞亚群异常活化；活动期、静止期SLET淋巴细胞CD226^＋表达均增高，CD226^ 可能参与了SLE的免疫发病。     

CD4+CD25+调节性T细胞与系统性红斑狼疮病情活动性关系的研究

目的：检测系统性红斑狼疮患者外周血CD4^＋CD25^＋、CD4^＋CD8^＋调节性T细胞亚群，探讨其与疾病活动性、肾脏损伤、血清抗ds-DNA抗体及免疫球蛋白和补体C3含量的关系。方法：采用流式细胞术检测北京协和医院住院和门诊SLE患者（n=37）外周血CD4^＋CD25^＋T、CD4^＋CD8^＋T细胞群比例，以15例RA和15例SS组成自身免疫性疾病对照，30例健康体检者作为正常对照，观察调节性T细胞亚群与SLE患者疾病活动性指标SLEDAI、IgG、C3及血清抗ds-DNA抗体的关系。结果：①疾病活动期SLE患者外周血CD4^＋CD25^＋调节性T细胞群比例显著低于正常对照组（P〈0.01），疾病稳定期和风湿性疾病对照组与正常对照组结果差异无统计学意义。疾病活动期和稳定期SLE患者CD4＋CD8＋T细胞群比例都略高于正常对照组，但未发现结果差异有统计学意义（P〉0.05）。②疾病活动期SLE患者外周血CD4^＋CD25^＋T细胞比例及CD4^＋CD25^＋/CD4^＋值显著低于稳定期患者（P〈0.01）。SLE患者外周血CD4^＋CD25^＋/CD4^＋值与SLEDAI、补体C3呈低度相关（r分别为-0.491、0.368，P〈0.05），CD4^＋CD25^＋T细胞数量与SLEDAI呈负相关（r=-0.578，P〈0.05）。③SLE并发肾病组外周血CD4^＋CD25^＋T细胞群比例及CD4^＋CD25^＋/CD4^＋值显著低于非肾病组（P〈0.01；P〈0.05）。同一SLE患者治疗前后CD3^＋CD4^-CD8^-细胞和NK细胞降低，CD4^＋CD25^＋细胞、CD4^＋CD25^＋/CD4^＋值及CD8^＋T细胞增加，但未发现这些结果差异有统计学意义。本次研究未发现NK细胞、CD4^＋CD8＋T细胞、CD4^＋CD25^＋T细胞群比例在ds-DNA＋组与ds-DNA-组之间结果差异有统计学意义。结论：SLE患者外周血CD4^＋CD25^＋T细胞群比例与SLEDAI成负相关，与肾脏的损害也有密切关系，但与血清抗ds-DNA抗体产生的关系不明显。活动期SLE患者外周血CD4^＋CD25^＋T细胞减少，稳定期CD4^＋CD25^＋T细胞比例回升，因此推测CD4^＋CD25^＋T细胞的变化可能是导致疾病发生和病情发展及相关器官（如肾脏）损伤的关键环节之一。     

他克莫司与环孢菌素A对肝移植受者CD4/CD8 T淋巴细胞亚群及共刺激分子的调节作用

目的:探讨他克莫司(Tacrolimus, FK506)与环孢菌素A(CsA)对肝移植受者T淋巴细胞亚群共刺激分子的调节作用.方法:采用荧光标记单克隆抗体(mAb)结合流式细胞技术, 测定移植术后使用FK506或CsA治疗2月末的肝移植受者外周血T细胞亚群及其表面共刺激分子CD28、CD152 和ICOS的表达情况.以健康志愿者(健康对照组)和患终末期肝脏疾病拟进行肝移植者(疾病对照组)为对照.结果:疾病对照组T细胞亚群平衡紊乱、共刺激分子表达异常(P＜0.05).治疗组肝移植受者T淋巴细胞亚群表达恢复至健康对照水平, T细胞表面CD28和ICOS分子表达显著降低(P＜0.05)而CD152分子表达明显升高(P＜0.05).比较不同药物治疗组:CsA治疗组CD4 T细胞表达和CD8 T细胞表面CD28、CD152分子表达均明显高于FK506治疗组(P＜0.05);其他指标无统计学意义(P＞0.05).结论:在常规血药浓度条件下FK506和CsA的对CD4/CD8T细胞亚群及共刺激分子的免疫调节作用存在差异.FK506对T细胞亚群的调节作用强于CsA.FK506可同时抑制正性共刺激分子CD28和ICOS表达并促进负性共刺激分子CD152表达, 而CsA对T细胞免疫抑制作用主要是通过促进CD152分子的高表达介导.     

CD4+CD25+T细胞在系统性红斑狼疮中的表达及意义

目的：探讨CD4^＋ CD25^＋ T细胞、IL-10在系统性红斑狼疮（SLE）患者外周血的表达及临床意义。方法：入组30例SLE患者和20例正常对照者，其中活动性SLE患者17人，非活动性SLE患者13人。用流式细胞仪检测SLE患者和正常对照者的外周血CD4^＋ CD25^＋ T细胞阳性率，用酶联免疫吸附试验（ELISA）检测血清中IL-10浓度。结果：活动性和非活动性SLE患者CD4^＋ T细胞总数均低于正常对照者；活动性和非活动性SLE患者CD4^＋ CD25^＋ T细胞阳性率高于正常对照者；活动性SLE患者IL-10浓度显著高于非活动性SLE患者和正常对照者。SLE患者CD4^＋ CD25^＋ T细胞阳性率和血清IL-10浓度与补体C3、抗DNA抗体水平及SLEDAI积分均无相关性。结论：SLE患者外周血CD4^＋ CD25^＋ T细胞是活化T细胞的标志，IL-10分泌异常与SLE的发病有关。     

北京市不同转归SARS患者免疫学指标的比较性研究

目的 :探讨不同转归 (治愈 死亡 )严重急性呼吸综合征 (severeacuterespiratorysyndrome,SARS)患者病程中免疫学指标变化趋势的差异 ,以指导临床诊治和判断预后。方法 :应用SARS病历数据库 ,收集治愈和死亡SARS患者病程前 4周CD3、CD4、CD8淋巴细胞绝对值 ,CD4 CD8比值 ,淋巴细胞百分比数据 ,比较不同转归SARS患者免疫学指标的变化趋势及差异。结果 :治愈组和死亡组SARS患者CD3,CD4 ,CD8计数在起病的 1～ 2周内明显低于正常值。但治愈组各免疫学指标从第 2周起呈逐渐恢复趋势 ,而死亡组则一直呈明显降低趋势 ,第 2周仍无恢复且显著低于治愈组 (P <0 0 5 ) ,并随病程延长显著性差异更大 (P <0 0 1,P <0 0 0 1) ;CD4 CD8比值在病程中基本不变 ,无显著性组间差别。结论 :CD3、CD4、CD8淋巴细胞亚群绝对值的动态变化是判断疗效和预后的重要依据     

B cells in the aged: CD27, CD5, and CD40 expression

Ageing is characterized by numerous changes in lymphocyte subpopulations. In the present paper we have focused on B cells carrying the surface markers CD27, CD5 and CD40. CD27 is considered a marker of primed (memory) cells and its engagement promotes the differentiation of memory B cells into plasma cells. CD5 is expressed on B1 cells, which are considered to be responsible for T cell-independent antibody production other than autoantibodies. The CD40 molecule binds CD40L (CD154) and is necessary for T-dependent antibody responses. Here we show that the absolute number of CD5+ and CD40+ B cells is decreased in the elderly, while CD27+ B lymphocytes only marginally decrease in centenarians. However, there is a decrease of the percentage of CD5+ B cells, an increase of CD27+ B cells, while CD40 does not change significantly. These data, together with the increased number of NK cells during aging, suggest different regulation of antibody production in the elderly which might be another example of immune remodeling with aging, based on interactions between human B and NK cells.     

红车轴草提取物对小鼠T淋巴细胞体外活化的抑制作用

探讨红车轴草提取物(Trifolium pratense Leguminosae extract,TLE)对小鼠T淋巴细胞的体外活化的影响。无菌条件下制备小鼠淋巴细胞悬液;双色荧光抗体染色结合流式细胞术分别分析TLE对小鼠T淋巴细胞在刀豆蛋白A(ConA)或佛波醇酯(PDB)刺激下的体外分化抗原CD69、CD25、CD71表达的影响。终质量浓度为20、30、40 mg/L的TLE对小鼠T淋巴细胞在ConA或PDB刺激下的体外分化抗原CD69、CD25、CD71表达具有明显的抑制作用(P<0.01)。TLE对ConA或PDB刺激的不同时期的小鼠T淋巴细胞的体外活化具有明显的抑制作用。     

Modulation of CD4 lateral interaction with lymphocyte surface molecules induced by HIV-1 gp120

CD4, a lymphocyte surface glycoprotein, serves as co-receptor for antigen with the T cell receptor (TCR). It is also the lymphocyte receptor for HIV by binding the gp120 viral envelope protein. Interaction of gp120 with CD4 is crucial for viral infection, but is not sufficient to allow viral entry into cells. Recombinant gp120 alters CD4⁺ T cell responsiveness to activation stimuli. To express its co-receptor function fully, CD4 must be laterally associated with the TCR and CD45 to form multi-receptor complexes competent to transduce potent activation signals. Here, we examine the possibility that gp120/CD4 binding alters lateral associations of CD4 with other lymphocyte surface molecules, and that assembly of abnormal multi-molecular complexes is involved in the gp120-induced CD4⁺ T cell dysfunction and in viral entry. In the absence of gp120, CD4 displayed high association with CD3, CD5, CD45RC, CD25, CD28, CD44, and CD53; weak association with CD2, CD38, CD45RB, CD62L, and CD26; and no association with CD45RA, CD45RO, CD11b, CD11a, CD54, CD7, CD48, CD98, CD59, CD55, HLA class I and class II molecules. Treatment with gp120 significantly increased CD4 association with CD3, CD45RA, CD45RB, CD59, CD38, CD26, and HLA class I, and decreased that with CD45RC. Specificity of these results were assessed at various levels. First, gp120 did not influence lateral associations displayed by other molecules, such as HLA class II. Second, the Leu3 mAb, which binds CD4 on a site overlapping the gp120 binding site, did not elicit the same CD4 lateral associations as gp120, and finally, a direct gp120/CD4 interaction was needed to induce the lateral associations, as shown by the observation that blocking the gp120/CD4 binding by the Leu3 mAb inhibited the gp120-induced associations. These results can be interpreted in several ways. gp120/CD4 interaction could trigger an inside-out signal responsible for the associations, or gp120 could induce steric modifications of CD4 that increase its affinity for the associating molecules. Alternatively, these molecules may interact directly with gp120, bridging them with CD4. It is also possible that the associations may be mediated by additional components, interacting with both gp120 and the associating surface molecule. The last hypothesis is likely for CD59, whose gp120-induced association with CD4 required the presence of serum in the co-capping assay. Since both CD59 and gp120 bind complement, the observed association could be mediated by complement components.     

CD45RA and CD45RO isoforms in infected malnourished and infected well-nourished children.

The aim of this study was to determine if the distribution in vivo of CD4(+)CD45RA(+)/CD45RO(-) (naive), CD4(+)CD45RA(+)/CD45RO(+) (Ddull) and CD4(+)CD45RO(+) (memory) lymphocytes differs in malnourished infected and well-nourished infected children. The expression of CD45RA (naive) and CD45RO (memory) antigens on CD4(+) lymphocytes was analysed by flow cytometry in a prospectively followed cohort of 15 malnourished infected, 12 well-nourished infected and 10 well-nourished uninfected children. Malnourished infected children showed higher fractions of Ddull cells (11.4 +/- 0.7%) and lower fractions of memory cells (20.3 +/- 1.7%) than the well-nourished infected group (8.8 +/- 0.8 and 28.1 +/- 1.8%, respectively). Well-nourished infected children showed increased percentages of memory cells, an expected response to infection. Impairment of the transition switch to the CD45 isoforms in malnourished children may explain these findings, and may be one of the mechanisms involved in immunodeficiency in these children.     

BY55/CD160 cannot be considered a cytotoxic marker in cytomegalovirus-specific human CD8(+) T cells

CD160/BY55 is a glucosyl-phosphatidylinositol (GPI)-anchored cell membrane receptor that is expressed primarily in natural killer (NK) cells. Its presence in CD8(+) T lymphocytes is considered to be a marker of cytotoxic activity, although there are few data in this regard. In the present work, we analysed the expression of CD160 in subpopulations of cytomegalovirus (CMV)-specific CD8(+) T cells. Subpopulations were defined by CD28 and CD57 expression and exhibited varying degrees of differentiation and cytotoxic potential, as evaluated by the expression of perforin, interferon (IFN)-gamma and interleukin (IL)-7Ralpha/CD127. We included subjects with different intensities of anti-viral immune response. Results showed that the terminally differentiated CD28(-) CD57(+) subset displaying the highest level of perforin expressed CD160 at a level similar to that of memory CD28(+) CD57(-)perforin(-) cells. A comparison of the expression of perforin in CD160(+) cells versus CD160(-) cells showed that expression was significantly higher in the absence of CD160. Interestingly, the CMV-specific CD8(+) T cell subset from a patient with ongoing CMV reactivation did not begin to express CD160 until day +92 of the follow-up period. Taken together, our data show that CD160 cannot be considered a cytotoxic marker in CMV-specific CD8(+) T cells.     

PTA1/CD226亚家族的研究进展

免疫球蛋白超家族(IgSF)成员占细胞黏附分子(CAM)的一大部分, 通过识别细胞表面相应的配体或受体, 发挥多方面的免疫学功能.现就一组同源IgSF新成员, 包括血小板/T细胞活化抗原1(PTA1/DNAM-1/CD226)和CD96(Tactile)两个受体及其两个配体脊髓灰质炎病毒受体(PVR/CD155)和单纯疱疹病毒受体(nectin-2/CD112)的结构、相互作用、免疫学功能以及与临床的关系作一综述.     

益活清胰Ⅰ号对重症急性胰腺炎大鼠中性粒细胞与内皮细胞黏附的抑制作用

目的观察益活清胰Ⅰ号对重症急性胰腺炎(severe acute pancreatitis,SAP)大鼠的中性粒细胞(polymorphonuclear cell,PMN)-内皮细胞(endothelial cell,EC)黏附率及PMN表面黏附分子CD11/CD18表达的影响,探讨其治疗SAP的机理。方法81只SD大鼠随机分为假手术组(n=27)、造模组(n=27)、治疗组(n=27),SAP模型采用5%的牛磺胆酸钠胰胆管逆行注射方法建立。6、12、24h分批处死动物9只采集动脉血和胰腺组织标本,测定胰腺组织的MPO活性,HE染色光镜下观察胰腺组织的病理变化。分离PMN,与体外培养的血管内皮细胞作用测定PMN-EC黏附率,ELISA法测定PMN表面CD11a/CD18、CD11b/CD18。结果与假手术组比较,造模组和治疗组术后各时点胰腺组织MPO活性、PMN-EC黏附率、PMN表面CD11a/CD18和CD11b/CD18均增高(P<0.01),治疗组术后各时点胰腺组织MPO活性、PMN-EC黏附率、PMN表面CD11a/CD18和CD11b/CD18均显著低于造模组(P<0.01)。造模组胰腺组织出血和坏死严重,治疗组的病理损伤明显减轻。结论益活清胰Ⅰ号能降低PMN表面CD11a/CD18和CD11b/CD18的表达水平,减轻PMN与EC的黏附,从而有助于减轻PMN与EC黏附所致的胰腺组织病理损伤。     

CD70 represents the human ligand for CD27

The recently identified CD27 ligand (L) Is a type II transmembranemolecule with significant structural homology to tumor necrosisfactor (TNF)-, TNF-ß, lymphotoxin ß, CO40L,and CD30L. Using a CD27L specific mAb we examined the tissuedistribution of the molecule, and found Its expression to berestricted to B cells in occasional germinal centers, stromalcells in the thymic medulla, and scattered T cells in tonsils,skin and gut. As the limited expression of CD27L closely resembledthe reported distribution of the activation antigen CD70, wetested whether CD70 represents the human CD27L. CD70 mAb werefound to react with CD27L-expressing transfected mouse fibroblasts.Moreover a number of CD70 mAb could specifically interfere withthe cellular binding of CD27L mAb. Thus, CD70 Is Identical tothe human CD27L.     

隐匿型肾小球肾炎外周血CD44、CD54、CD62P的表达及意义

目的:探讨隐匿型肾小球肾炎外周血粘附分子CD44、CD54、CD62P的表达与疾病的关系。方法:采用流式细胞全血免疫荧光直标术对25例隐匿型肾小球肾炎患者外周血进行CD44、CD54、CD62P标记后,上流式细胞仪检测。结果:隐匿型肾小球肾炎患者外周血CD44、CD54、CD62P的表达显著高于正常对照(P<0.01),而且肉眼血尿组CD44、CD54、CD62P的表达显著高于尿检异常组(P<0.01)。结论:黏附分子CD44、CD54、CD62P可能介导和参与了隐匿型肾小球肾炎的发生及发展过程,外周血粘附分子CD44、CD54、CD62P的检测可为临床隐匿型肾小球肾炎的诊断和治疗提供分子依据。