系统性红斑狼疮患者外周血白细胞介素15的研究

目的：检测系统性红斑狼疮（SLE）患者血清白细胞介素15（IL-15）水平及外周血单个核细胞（PBMC）IL-15mRNA表达，并进一步分析其临床意义。方法：IL-15检测采用ELISA方法；PBMCIL-15mRNA表达采用原位杂交法检测。结果：①SLE组患者血清IL-15水平显著高于正常对照组（P〈0．01），活动期SLE患者血清IL-15水平显著高于缓解期患者（P〈0．05）。②发生临床肾损害者IL-15水平明显高于无肾损害者（P〈0．05），出现血清抗dsDNA抗体阳性、低补体C3血症、高IgG血症者血清IL-15水平均分别显著高于无上述表现者。③SLE患者PBMCIL-15mRNA表达量明显高于正常对照组（P〈0．05），活动期SLE显著高于缓解期（P〈0．05）。④SLE患者PBMC培养上清IgG、IgM和抗dsDNA抗体浓度均显著高于正常对照组；SLE患者PBMCIL-15mRNA表达量与细胞培养上清的IgG及抗dsDNA抗体滴度均呈正相关关系（分别为r=0．645和r=0．715，P〈0．05），而与IgM．无相关关系（r=0．451，P〉0．05）。⑤SEE患者PBMCIL-15mRNA表达量与血清IL-15水平呈正相关关系（r=0．726，P〈0．05）。结论：SLE患者存在外周血IL-15蛋白和基因表达异常，且与其分泌免疫球蛋白和自身抗体有关，提示IL-15可能参与SLE的病理生理过程。     

环磷酰胺冲击疗法对狼疮性肾炎血清IL—6的影响

目的探讨白介素-6(IL-6)在狼疮性肾炎(LN)发病中的作用及大剂量环磷酰胺静脉给药(IV-CTX)对IL-6产生的影响.方法应用ELISA双抗体夹心法对IV-CTX治疗前后LN患者血清IL-6水平进行检测.结果活动期LN血清IL-6水平显著高于非活动期及健康人(P＜0.001),血清IL-6水平与血沉呈显著正相关(n=22,r=0.570,P＜0.01);抗ds-DNA抗体阳性且血清IgG＞16g/L的LN患者有更高的血清IL-6水平(P＜0.05);活动期LN治疗4w后血清IL-6水平显著下降(P＜0.001).结论LN的B细胞过度活化和自身抗体产生可能与IL-6分泌过量有关.IV-CTX可能通过抑制IL-6的产生而减轻免疫损伤,血清IL-6检测有助于监视狼疮活动和免疫抑制剂疗效.     

IL-17、干扰素-γ在红斑狼疮患者体内的表达及地塞米松对其的抑制作用

目的研究系统性红斑狼疮（SLE）患者血浆及外周血单个核细胞（PBMCs）中IL-17、IFN-γ的表达水平,探讨地塞米松对PBMC分泌IL-17和IFN-γ的影响。方法采用双抗体夹心酶联免疫吸附法（ELISA）测定SLE患者和健康对照者血浆及PBMCs培养上清液中IL-17、IFN-γ的表达水平。结果SLE患者组血浆IL-17、IFN-γ含量均高于健康对照组（t=d．96,P〈0．001;t=2．43,P〈0．05）,SLE活动组患者血浆IL-17水平明显高于非活动组（t=g．52,P〈0．005）;血浆IL-17水平与SLE疾病活动性指数（SLEDAI）、抗dsDNA抗体滴度呈正相关（r=0．681,0．492）,与补体C3、C4水平呈负相关（r=-0．529,-0．534）。无佛波酯（PMA）刺激条件下,SLE患者PBMCs培养上清液中细胞因子水平与对照组均无显著差异（t=0．06,P〉0．05）．力口人PMA刺激后,SLE患者PBMCs分泌IL—17的水平显著高于正常对照组（t=2．48,P〈0．05）;地塞米松可明显抑制PMA刺激后的PBMCs分泌IL-17和IFN-γ水平（t=3．72,3．34,P〈0．01）,且地塞米松对PBMCs分泌IL-17的抑制率更高。结论SLE患者体内细胞因子的表达水平存在明显异常,IL-17表达水平显著增高,且与疾病活动性有明显关联,地塞米松可明显抑制IL-17的表达,提示IL—17可能是治疗SLE的一个潜在的新靶点。     

泌乳素促进类风湿关节炎患者外周血单个核细胞分泌白细胞介素-6

目的:探讨类风湿关节炎(RA)患者血清泌乳素(PRL)水平与疾病活动程度的关系,以及PRL促进外周血单个核细胞(PBMCs)分泌白细胞介素-6(IL-6)的机制。方法:收集我院2015年3月至9月40例初治RA患者临床及实验室资料。采用化学发光免疫分析法(CLIA)检测血清PRL水平,ELISA检测IL-6水平,RT-q PCR检测泌乳素受体(PRLR)mRNA的表达,Western blot法检测MAPK通路相关蛋白p-p38的蛋白水平。结果:RA患者血清PRL水平明显升高(P0.01),活动期RA患者PRL水平明显高于非活动期RA患者(P0.01)。PRL水平与DAS28评分、ESR和CRP呈正相关(P0.01)。RA患者PBMCs中PRLR水平明显升高(P0.01)。PRL可诱导PBMCs分泌IL-6,siRNA沉默PRLR或采用MAPK通路抑制剂可抑制IL-6的产生。结论:RA患者血清PRL升高与DAS28评分、ESR和CRP呈正相关,PRL可作为预测RA严重程度的指标。PRL通过与PRLR相互作用,激活p38 MAPK通路,从而促进IL-6分泌。     

体外阻断CD134对LN患者外周血单个核细胞TH1/TH2细胞因子表达的影响

目的 探讨CD134／CD134L共刺激分子对TH1，TH2细胞因子表达的影响及在狼疮性肾炎（LN）发病机制中的可能作用。方法活动期LN患者10例，分别采取外周静脉血，用密度梯度离心法制备新鲜PBMC，分成6组：（1）对照培养组；（2）单纯刺激组；（3）抗CD134组；（4）抗Ⅱ，4组；（5）rhCD134：Fc组；（6）地塞米松（Dex）组。另选取10例健康体检者作为健康对照组。采用ELISA法分别测定培养液上清中IFN-γ、IL-4、IL-10表达水平。结果（1）在抗CD3ε单抗／rIL-2刺激前，活动期LN患者PBMC培养液上清分泌的IFN-γ、IL-4和IL-10水平都明显高于健康对照组；（2）在抗CD3ε单抗／rIL-2刺激下，活动期LN患者PBMC分泌的IFN-γ，4和IL-10又较刺激前明显增加；（3）抗IL-4单抗、抗CDl34单抗均可使经抗CD3ε单抗／rIL-2刺激的LN患者PBMC分泌IL-4、IL-10水平显著下降，导致IFN-γ水平显著增高，免疫应答朝TH1方向偏离；（4）Dex能显著抑制抗CD3ε单抗／rIL-2刺激的原代培养PBMC中IL-4、IFN-γ的分泌水平，但对IL-10的产生并没有明显的抑制或促进作用；（5）rhCD134：Fc能显著降低抗CD3ε单抗／rIL-2刺激的原代培养PBMC中IFN-γ及IL-4、IL-10的分泌水平，对TH1和TH2细胞因子的产生都有显著抑制作用。结论糖皮质激素的抗炎机制具有多重性，对TH1、TH2细胞因子的作用并不均衡；抗CD134单抗对减轻LN患者PBMC的异常活化有一定作用；CD134-IgG融合蛋白与抗CD134单抗相比，抑制作用更明显，对急性期LN有更好的治疗作用。     

SLE患者外周血Th17细胞的表达及其临床意义

目的：探讨Th17细胞与系统性红斑狼疮（SLE）的发生及疾病活动性的相关性。方法：采用酶联免疫吸附法（ELISA）检测正常人和SLE患者外周血单个核细胞（PBMCs）刺激培养上清液中IL-17的水平,并用流式细胞术（FCM）分析PBMCs中Th17细胞的频率。结果：与正常对照组相比,稳定期和活动期SLE患者PBMCs刺激后产生IL-17的量明显增高（P〈0.01）,Th17细胞的频率也高于正常对照组（P〈0.01）。与静止期患者相比,活动期SLE患者PBMCs产生IL-17的水平和Th17细胞的频率也明显增高（P〈0.05）。结论：Th17细胞可能通过分泌细胞因子IL-17参与了SLE发病及病情发展,其水平高低部分反映SLE疾病的活动性。     

MCP-1及IL-10在狼疮性肾炎及其相关疾病活动度的临床意义

目的:分析活动期和静止期狼疮性肾炎(LN)患者血清和尿液标本中单核细胞趋化蛋白-1(MCP-1)和IL-10水平的变化并探讨其临床意义。方法:应用ELISA技术对活动期和静止期LN患者血清和尿液中MCP-1和IL-10进行检测,分析LN不同时期MCP-1和IL-10与其他相关指标之间的关系。结果:活动期患者尿液MCP-1水平显著地高于静止期患者,而血清MCP-1两者差异无统计学意义;活动期患者血清IL-10水平显著地高于静止期患者,而尿液IL-10两者差异无统计学意义。结论:尿液MCP-1和血清IL-10水平可能与LN活动存在一定的相关性,有望成为SLE肾脏损害及疗效观察的监测指标。     

细胞毒性T淋巴细胞相关抗原4融合蛋白抑制狼疮肾炎患者外周血单个核细胞B7分子表达及

目的探讨细胞毒性T淋巴细胞相关抗原4融合蛋白(CTLA-4Ig)对活动期狼疮肾炎(LN)患者外周血单个核细胞(PBMC)细胞表面B7-1(CD80)和B7-2(CD86)表达的影响及其对抗双链DNA(dsDNA)抗体和免疫球蛋白产生的影响。方法将18例活动期LN患者的抗凝血标本随机分为LN的CTLA-4Ig处理组(LN-T组9例)和普通培养组(LN-NC组9例)。另以14例正常人的抗凝血标本为对照,随机分为正常人的CTLA-4Ig处理组(NC-T组7例)和普通培养组(NC-NC组7例)。用密度梯度离心法分离PBMC。处理组加入CTLA-4Ig(10ng/L)、普通培养组加入等量普通培养基37℃孵育72h后,采用流式细胞仪技术检测PBMC细胞表面B7-1和B7-2分子的表达;ELISA法检测孵育液中抗dsDNA抗体、IgG及IgM水平。结果活动期LN患者CTLA-4Ig处理组与普通培养组比较,PB-MC表面B7-2分子表达明显下降(P<0.01);B7-1分子表达无显著变化(P>0.05);孵育液中抗dsD-NA抗体、IgG及IgM的生成均明显减少(P<0.01)。而正常人的两组间各指标差异均无统计学意义(P>0.05)。结论CTLA-4Ig可抑制活动期LN患者的PBMC表面B7-2分子的表达,并可减少其抗dsDNA抗体、IgG及IgM的分泌。     

系统性红斑狼疮患儿血清抗内皮细胞抗体检测的临床意义

为探讨抗内皮细胞抗体(anti-endothelial cell antibody, AECA)在系统性红斑狼疮(systemic lupus erythematosus, SLE)患儿外周血中的表达情况及其临床意义,采用间接免疫荧光法(indirect immunofluorescence analysis, IIF)检测35例SLE患儿外周血IgG-AECA的表达情况。患儿中活动期20例、缓解期15例,另选取15例择期手术患儿作为对照组,观察比较各组患儿外周血血清中IgG-AECA的表达情况,同时检测上述35例SLE患儿外周血中抗dsDNA抗体的表达情况。将35例SLE患儿根据外周血中IgG-AECA的表达情况分为IgG-AECA阳性组和IgG-AECA阴性组,分别观察两组患儿免疫功能、炎症反应和凝血功能等各项检测指标间的差异以及继发狼疮性肾炎(lupus nephritis, LN)和尿微量蛋白的表达情况。结果显示,对照组儿童外周血IgG-AECA均为阴性,SLE患儿IgG-AECA的阳性率(51%)明显高于对照组(P0.05),且活动期SLE组患儿IgG-AECA的阳性率(70%)明显高于对照组(P0.05);SLE患儿外周血dsDNA的阳性率为40%,IgG-AECA和dsDNA联合检测的阳性率提高至69%;IgG-AECA阳性组SLE患儿外周血中IgA、IgM、IgG水平,sIL-2R、IL-6和TNF-α水平,纤维蛋白降解产物(fibrin degradation products, FDP)和D-二聚体水平以及尿微量蛋白表达水平均高于IgG-AECA阴性组(P0.05),而C4水平低于IgG-AECA阴性组(P0.05)。该研究提示IgG-AECA与SLE患儿疾病活动性密切相关,其可通过介导免疫功能紊乱参与SLE的发病过程,并可导致患儿肾脏功能损伤,对LN的诊断具有临床指导意义。     

系统性红斑狼疮病人外周血Th细胞和Tc细胞IFN-γ及IL-4表达水平与疾病的关系

目的：观察SLE病人体内Th1／Th2及Tc1／Tc2比例失衡及其与疾病的关系。方法：SLE病人（活动期病人15例，稳定期病人20例）及正常人20例外周全血经PMA（20ns／ml）和离子霉索（ionomyein，1μmol／L）刺激4小时后，采用四色流式细胞术检测CD3^＋CD8^＋T细胞（主要为Th细胞）及CD3^＋CD8^＋T细胞（Tc细胞）胞浆内IFN-γ及IL-4的表达水平。血清抗dsDNA抗体检测采用ELISA法、血清免疫球蛋白和尿蛋白含量测定采用免疫速率散射比浊法。结果：SEE活动期病人Th细胞中IFN-γ的阳性百分率明显低于稳定期病人及正常人，Tc细胞中IFN-γ的阳性百分率明显低于正常人；IL-4的阳性百分率各组问无明显差异。稳定期病人仅Tc细胞IFN-1的百分率明显低于正常人。血清抗dsDNA抗体（＋）病人Th和Tc细胞IFN-γ的阳性百分率明显低于抗dsDNA（-）病人；免疫球蛋白（IgG，IgA，IgM中任何一种）异常增高的病人Th及Tc细胞中虽IL-4的阳性百分率无变化，但平均荧光强度明显高于免疫球蛋白水平正常的病人。Th及Tc细胞中IFN-γ和IL-4的表达水平与尿蛋白含量无明显关系。结论：SLE病人体内存在1型及2型细胞因子的异常表达，并与疾病活动程度存在一定的关系，值得进行深入研究。     

Ganglioside GQ1b enhances anti-double-stranded DNA antibody and IgG production of PBMCs from patients with systemic lupus erythematosus

BACKGROUND: Previously, we reported that ganglioside GQ1b greatly enhanced spontaneous immunoglobulin production in vitro by PBMCs from normal human subjects. OBJECTIVE: We examined in vitro effects of GQ1b on anti-double-stranded DNA (anti-dsDNA) antibody production by PBMCs from patients with systemic lupus erythematosus (SLE). METHODS: PBMCs from patients with SLE were cultured with GQ1b. IgG anti-dsDNA antibody, total IgG, and cytokine amounts in the culture supernatants and protein kinase C (PKC) activity of T cells were measured by using ELISA. RESULTS: GQ1b enhanced both anti-dsDNA and total IgG production of PBMCs from patients with SLE who were seropositive for anti-dsDNA. Among the seropositive patients, the active patients were more responsive to GQ1b in anti-dsDNA production than the inactive patients. GQ1b also enhanced total IgG production of PBMCs from patients with SLE who were seronegative for anti-dsDNA but did not induce their anti-dsDNA production. In contrast to PBMCs, GQ1b did not affect the antibody production either of purified CD5(+) or of CD5(-) B cells. Anti-IL-6 or anti-IL-10 antibody each partially blocked the GQ1b-induced enhancement of antibody production in PBMCs, and the addition of both antibodies completely blocked the enhancement. GQ1b increased IL-6 and IL-10 production of T cells. The supernatant from GQ1b-treated T cells enhanced antibody production both of CD5(+) and of CD5(-) B cells to a greater extent than that from medium-treated T cells. Exogenous IL-6 and IL-10 additively increased the antibody production both of CD5(+) and CD5(-) B cells. GQ1b-induced increases in IL-6 and IL-10 production of T cells were both blocked by PKC inhibitors, calphostin C and staurosporine. GQ1b enhanced PKC activity of T cells. CONCLUSION: These results suggest that GQ1b may polyclonally increase the production of IgG, including IgG anti-dsDNA antibody, in PBMCs from patients with SLE by promoting IL-6 and IL-10 production of T cells through the enhancement of their PKC activity.     

狼疮肾炎外周血单个核细胞IL-16活化的初步观察

目的:目的:观察狼疮肾炎(LN)外周血单个核细胞(PBMCs)白细胞介素16(IL-16)的分泌及IL-16mRNA的表达。方法:采用酶联免疫吸附法(ELISA)检测PBMCs IL-16分泌的水平;采用逆转录聚合酶链反应(RT-PCR)方法检测PBMCs IL-16mRNA的表达。结果:①LN患者PBMCs自发分泌IL-16,活动组较静止组、正常对照组增高,存在显著性差异(265.6±102.2vs.120.5±84.1;265.6±102.0 vs.50.9±32.4,P<0.05);②LN活动组与静止组PBMCs IL-16mRNA表达增强,较正常对照组存在显著性差异(5.090±1.815 vs.1.030 ±0.426;3.910±1.430 vs.1.030±0.426,P<0.05),但LN活动组与静止组之间IL-16-mRNA的表达差异没有显著性(5.090 ±1.815 vs.3.910±1.430)。结论:LN患者PBMCs存在IL-16mRNA的高表达和自发的IL-16过度分泌。IL-16可能参与介导LN的发病机制。     

狼疮肾炎PBMC高表达抗ds-DNA抗体和IL-6由MAPKERK1/2通路介导

目的：探讨有丝分裂原激活的蛋白激酶-细胞外调节激酶1/2（MAPKERK1/2）信号通路在系统性红斑狼疮合并肾炎（LN）患者外周血单个核细胞（PBMC）中自发高水平表达白细胞介素6（IL-6）和抗双链DNA抗体（抗ds-DNA抗体）中的作用。 方法： 分离培养患者PBMC，利用蛋白免疫印迹法、逆转录PCR 法和酶联免疫吸附法分别检测MAPKERK1/2磷酸化活化程度、IL-6表达和抗ds-DNA抗体水平，并与正常对照组比较。 结果： 26例LN患者与21例健康对照者比较，体外培养LN患者PBMC MAPKERK1/2信号通路呈高度活化状态，并自发表达高水平IL-6和抗ds-DNA抗体，组间有显著差异(P<0.05)。应用特异性阻断剂PD98059阻断LN患者PBMC MAPKERK1/2信号通路活化可显著抑制IL-6 和抗ds-DNA抗体的自发高表达。 结论： LN患者PBMC中MAPKERK1/2信号通路异常活化，并介导PBMC自发高水平表达IL-6 和抗ds-DNA抗体。     

The Lupus-derived Anti-double-stranded DNA IgG Contributes to Myofibroblast-like Phenotype in Mesangial Cells

Anti–double-stranded DNA (dsDNA) antibodies have been indicated to play a major role in the pathogenesis of lupus nephritis (LN), which is characterized by mesangial alterations, including phenotypic changes. To explore the effects of anti-dsDNA antibodies on the phenotype of mesangial cells (MCs), the anti-dsDNA IgG in sera and histological features of glomeruli were analyzed in the mice models of immune-complex glomerulonephritis. The MCs were cultured in vitro with the addition of anti-dsDNA or non-anti-dsDNA IgG. Compared to the anti-dsDNA-negative controls, the serum positive mice had increased extracellular matrix accumulation and higher alpha-smooth muscle actin expression in the mesangial region. The anti-dsDNA IgG enhanced the synthesis of transforming growth factor beta, alpha-smooth muscle actin, and fibronectin, and even induced the myofibroblast-like morphological features in cultured MCs. Our results indicated that anti-dsDNA antibodies contribute to the phenotypic changes in MCs, which suggests another mechanism of renal injuries in LN induced by anti-dsDNA antibodies.     

Anti-neutrophil Cytoplasmic Antibodies in New-onset Systemic Lupus Erythematosus and Lupus Nephritis

This study aims to investigate the role of Antineutrophil cytoplasmic antibodies (ANCA) in patients with new-onset systemic lupus erythematosus (SLE). Sixty SLE patients, 28 of whom had lupus nephritis (LN), and 60 normal controls were enrolled; Serum ANCA was measured by enzyme linked immunosorbent assay (ELISA). The clinical and laboratory parameters of the patients were also recorded. Results show that twenty SLE patients were seropositive for ANCA, which was significantly higher than in normal controls. LN patients had significantly higher positive rate of ANCA than patients without nephritis. Compared with ANCA-negative patients, the ANCA-positive patients had significantly higher incidence of nerves system disorder, myocarditis, renal involvement and serositis. The positive rate of gamma-globulin, anti-dsDNA and anti-Sm antibodies were significantly higher in ANCA-positive patients. Elevated IgG and ESR, decreased serum C3/C4 appeared more often in ANCA-positive patients. In addition, serum ANCA level correlated positively with disease activity. Taken together, ANCA might be used as a potential complementary parameter to differentiate LN from SLE without nephritis. In addition, ANCA may serve as a useful marker of the disease activity of SLE.     

Exposure of chromatin and not high affinity for dsDNA determines the nephritogenic impact of anti-dsDNA antibodies in (NZB×NZW)F1 mice

Recent studies have demonstrated that the nephritogenicity of antibodies to dsDNA and nucleosomes confers to binding of glomerular membrane-associated nucleosomes, and not to cross-reacting glomerular antigens. There is no known parameter that determines antibody pathogenicity aside from specificity for dsDNA/nucleosomes, and systemic lupus erytheomatosus (SLE) patients may have high titer anti-dsDNA antibodies irrespective whether they have lupus nephritis or not. One parameter may be antibody affinity, as theoretically only high affinity antibodies may bind in vivo in a stable way. This was analyzed in (NZB × NZW)F1 mice with full-blown lupus nephritis. These mice had serum antibodies to dsDNA, and IgG autoantibodies bound in situ in glomerular membrane-associated electron dense structures as determined by immune electron microscopy (IEM). Intrinsic affinity of purified circulating and glomerular IgG anti-dsDNA antibodies was determined by surface plasmon resonance. The results demonstrate that affinity of glomerular-bound anti-dsDNA antibodies was higher than for those in circulation. However, affinity of glomerular in situ-bound antibodies from different mice varied considerably, from K_D in the range from 10^{? 8} to 10^{? 13}. These results indicate that antibody affinity is not a decisive pathogenic factor, but rather that availability of chromatin fragments may be the factor that determines whether an anti-dsDNA antibody binds in glomeruli or not.     

Characterization of Anti-Mesangial Cell Antibodies and Their Target Antigens in Patients with Lupus Nephritis

The pathogenetic mechanisms of lupus nephritis (LN) remain to be elucidated. In our previous study, autoantibodies against human glomerular mesangial cells (HMC) were identified in sera of most patients with lupus nephritis. The current study is to investigate the binding characteristics of anti-mesangial cell antibodies to human mesangial cell membrane. Serum samples were collected from 54 patients with renal biopsy proven lupus nephritis, 12 patients with systemic lupus erythematosus without clinical renal involvement, and 15 healthy subjects. Membrane proteins were obtained from in vitro cultured HMC by sonication and sequential centrifugation. DNase I were employed to remove DNA fragments in sera and membrane protein preperation and IgG F(ab′)₂ was obtained by pepsin digestion. Western Blot analysis was used to characterize the antibody and antigen interaction. In results, 25 of 54 (46.3%) sera from patients with lupus nephritis had anti-mesangial cell antibodies targeted at 74 kDa, 63 kDa, 52 kDa and 42 kDa protein bands of HMC membrane. Only four of 12 (33.3%) sera from patients without renal involovement recognized the protein bands at 74 kDa and 63 kDa, but not 52 kDa and 42 kDa. DNase treatment of the HMC membrane and the sera did not affect the binding. IgG F(ab′)₂ from sera of 10 patients with positive anti-mesangial cell antibodies could still bind the 63 kDa protein. In conclusion, anti-mesangial cell antibodies from sera of patients with lupus nephritis could bind membrane proteins of HMC directly without a DNA bridge and the binding was through antigen–antibody interation. Anti-mesangial cell antibodies might play some role in the pathogenesis of lupus nephritis(LN).     

LFA-1与抗CD3 mAb共刺激对狼疮肾炎PBMC增殖和IgG合成的影响

目的 :探讨LFA 1与抗CD3mAb共刺激对狼疮肾炎 (LN)患者外周血单个核细胞 (PBMC)增殖与免疫球蛋白 (IgG)合成的影响。方法 :分离LN患者及健康人 (正常对照 )的PBMC ,采用Ficoll梯度密度离心法。细胞增殖实验采用3 H TdR掺入法。IgG测定采用ELISA法。结果 :在抗CD3mAb诱导下 ,2 9例LN非活动期和活动期PBMC中 ,3 H TdR的掺入量和IgG的合成均增加 ,且活动期的增殖强于非活动期 (P <0 .0 1) ;而单纯用抗CD3mAb对 12例正常对照的PBMC没有影响 (P >0 .0 5 )。抗CD3mAb与抗LFA 1mAb共刺激 ,均可增加LN患者 (活动期和非活动期 )及正常对照PBMC3 H TdR掺入量和IgG合成 ,其中活动期增殖效应强于非活动期 (P <0 .0 1) ,后者又强于正常对照 (P <0 .0 1)。抗LFA 1中和抗体的加入 ,可明显抑制LFA 1诱导的共刺激效应 (P <0 .0 1)。结论 :LFA 1促进LN患者PBMC增殖和IgG合成 ,可能是其参与LN发病的机制之一