来氟米特对狼疮肾炎患者T细胞表面共刺激分子谱影响的体外研究

目的 了解来氟米特(LEF)对狼疮肾炎(LN)患者外周血T淋巴细胞表面共刺激分子谱的表达模式有无作用.方法 密度梯度离心法提取LN患者及健康对照外周血单个核细胞(PBMCs),设立4个培养组:空白组,植物血凝素(PHA)组,LEF组,PHA+LEF组.双色标记流式细胞术检测PBMCs中T细胞表面分子CD28,CD40L,淋巴细胞功能相关抗原(LFA)-1a和细胞毒T淋巴细胞相关抗原(CTLA)-4的表达水平.多组间比较采用单因素方差分析.结果 活动性LN组外周血T细胞表面CD28、CD40L、L FA-1a和CTLA-4表达水平较健康对照组明显上调CD28:33.4±6.5和14.4±3.2;CD40L:13.2±3.2和5.4±2.3;LFA-1a:8.5±2.3和2.2±1.1;CTLA-4:4.6±1.5(P均＜0.01);PHA可诱导健康对照T细胞表面CD28和CD40L表达明显上调CD28:26.8±6.7和14.4±3.2;CD40L:13.9±4.9和5.4±2.3(P均＜0.01),但对其CTLA-4和LFA-1α的表达无明显影响(P均＞0.05);而PHA对活动性LN组外周血T细胞表面上述指标表达均有明显上调作用CD28:54.8±9.5和33.4±6.5;CD40L;49.9±9.1和13.3±3.2;LFA-1a:25.5±7.5和8.5±2.3;CTLA-4:10.5±2.8和7.7±1.4(P均＜0.05);LEF活性代谢产物A771726对健康人外周血T细胞表面上述指标的表达无明显影响,但可逆转活动性LN患者外周血T细胞表面的CD40L、LFA-1α过度表达(P均＜0.05),对其CD28和CTLA-4过度表达无明显影响(P均＞0.05);且A771726对PHA所诱导的活动性LN患者外周血T细胞表面CD28、CD40L和LFA-1a表达增加亦有明显抑制(P均＜0.05).结论 LEF可下调活动性LN患者外周血T细胞CD40L和LFA-1a表达,而对其CD28和CTLA-4表达无明显抑制作用,可能是其有效治疗LN的重要机制之一.     

丙型肝炎病毒多CTL表位树突状细胞疫苗的构建及体外刺激T细胞应答

目的构建丙型肝炎病毒（HCV）多细胞毒性T淋巴细胞（CTL）表位树突状细胞（DC）疫苗,观察其体外刺激的T细胞反应,为下一步做体内免疫实验提供一定的资料。方法构建和制备出含绿色荧光蛋白（GFP）标签的HCV两个CTL表位的重组腺病毒,感染DC,直接在荧光显微镜下或用流式细胞仪检测其感染率;RT-PCR和Western Blot方法检测HCV多CTL表位的表达。流式细胞术分析感染前后DC的CD80、CD83、CD86和人类白细胞抗原（HLA）-DR的表达,CCK-8法观察感染重组腺病毒的DC促进T细胞的增殖效应。ELISA检测重组腺病毒刺激后的DC培养上清液内白细胞介素（IL）-12及DC和T细胞混合培养上清液内干扰素（IFN）-γ的含量。用乳酸脱氢酶（LDH）释放法检测特异性CTL的杀伤活性。结果成功构建含GFP标签的HCV多CTL表位的重组腺病毒,并在DC中表达。重组腺病毒能促进DC成熟,DC的CD80、CD83、CD86和HLA-DR的表达分别为（71.19±3.29）%、（81.21±5.07）%、（91.23±4.24）%、（97.95±5.31）%。感染DC后促进同源T细胞增殖,DC：T为1：10时增殖指数为6.806±0.247。分泌的IL-12和IFN-γ也明显增多,分别达到（193.83±6.25）pg/ml和（111.14±2.09）pg/ml。感染DC刺激的CTL能特异性杀伤转染FL-J6/JFH的Huh-7.5细胞,当效靶比为100：1时,AD1-DC-L的杀伤率为35.99%。结论重组多CTL表位腺病毒在体外能有效感染DC,促进了T细胞反应,为下一步抗HCV的DC疫苗研制打下基础。     

阿德福韦酯体外对慢性乙型肝炎患者树突状细胞功能的影响

目的:探讨体外阿德福韦酯(adefovir dipivoxil,ADV)对慢性乙型肝炎(chronic hepatitis B,CHB)患者外周血树突状细胞(dendritic cell.DC)功能的影响.方法:分离CHB患者及健康自愿者外周血单核细胞(Mo),在含rhGM-CSF rhIL-4及不同浓度ADV(20、100、500μg/L)培养条件下制备单核细胞源DC(MoDC).在倒置显微镜下观察DC的形态:FACS分析DC的表型;MTT法测定DC刺激同种异体T细胞增殖的能力;ELISA检测DC培养上清中IL-12 p40 p70的含量.结果:与CHB未处理组比较,CHB ADV处理组DC形态分化明显,激发初始T细胞增殖的能力加强.上清液中分泌的IL-12 p40 p70增多;在CHB ADV处理组(100μg/L),CDla 、CD83 、CD866和MHC-DR DC的数量均最多,显著高于CHB未处理组(43.5±5.7 vs 20.6±2.8.34.64±1.9 vs 16.7±3.4.40.94±2.8 vs 25.8±6.6,66.94±5.4 vs 40.74±4.2,均P＜0.05),但低于健康对照组,三组间差异具有统计学意义(P＜0.05).结论:ADV可以增强CHB患者外周血MoDC的免疫功能,提示其可能通过调节DC的功能而参与免疫应答,发挥间接抗病毒作用.     

恩替卡韦对慢性乙型肝炎患者树突状细胞功能的体外影响

目的:研究恩替卡韦(ETV)对慢性乙型肝炎(CHB)患者外周血树突状细胞(dendritic cell,DC)功能的影响.方法:体外常规分离CHB患者及健康人外周血单个核细胞,诱导扩增后常规培养.第4天将其与一定浓度的恩替卡韦共培养,第8天收获DC进行细胞表型、同种异体混合淋巴细胞反应等相关检测.结果:细胞培养8 d时DC形态分化健康对照组优于CHB ETV处理组,CHB ETV处理组优于CHB组;CHB组CD1a(35.73±3.12 vs 62.31±5.22,P<0.01),CD80(28.19±1.64 vs 45.38±3.10,P<0.01),CD83(22.24±2.14 vs 40.63±7.21,P<0.01)及HLA-DR(36.74±0.98 vs 56.05±3.89,P<0.01)表达明显低于健康对照组,而ETV处理组与CHB组相比CD83 (27.41±9.23 vs 22.24±2.14,P<0.05),CD80(32.67±7.82 vs 28.19±1.64,P<0.05)及HLA-DR(40.84±5.57 vs 36.74±0.98,P<0.01)显著高表达;淋巴细胞增殖能力测定ETV处理组DC刺激同种异体T淋巴细胞增殖能力较CHB组增强(1.53±0.09 vs 1.45±0.12,P<0.05).结论:恩替卡韦作为治疗CHB的新一代核苷类药物,除了直接抑制乙肝病毒DNA合成外,也能够增强CHB患者外周血DC的功能,通过调节机体的免疫系统发挥间接抗病毒作用.     

拉米夫定体外对慢性乙型肝炎患者树突状细胞功能的影响

目的:体外研究不同浓度拉米夫定(lamivu- dine,LAM)对慢性乙型肝炎(chronic hepatitis B,CHB)患者树突状细胞(dendritic cell,DC)功能影响．方法:分离慢乙肝患者外周血单核细胞,在含GM-CSF IL-4及不同浓度LAM(0,0．125, 0．25,0．5,1,2 mmol／L)培养条件下制备DC．观察DC形态学变化并用MTT法测定DC刺激同种异体淋巴细胞增殖能力,流式细胞仪(FCM) 测定其细胞表型分子CD1a,CD83,CD80及 HLA-DR的表达,ELISA法检测培养上清中 IL-12和IL-6含量．结果:在LAM 0．5 mmol／L组,DC表型分子 CD83,CD1a,HLA-DR的表达最高,CD80与 LAM未处理组相比无明显差异．与LAM未处理组相比,LAM 0．5 mmol／L处理组DC膜表面分子CD1a,CD83,HLA-DR表达增高(CD1a: 54．0±9．2 vs 33．6±10．1,P<0．05;CD83:20．3 ±6．1 vs 11．8±6．2,P<0．05;HLA-DR:74．5± 7．1 vs 52．9±7．7,P<0．05);其上清液中IL-12 分泌水平增高(810．0±91．5 ng／L vs 268．0± 34．3 ng／L,P<0．05),IL-6则显著降低(28．1± 2．6 ng／L vs 55．3±7．4 ng／L,P<0．05);刺激同种异体淋巴细胞增殖能力(SI)增强(1．9±0．6 vs 1．2±0．5,P<0．05)．结论:LAM体外可增强慢乙肝患者树突状细胞活性．     

来氟米特活性代谢产物抑制人单核细胞系细胞CD147基质金属蛋白酶-2及基质金属蛋白酶-9表达的研究

目的 观察来氟米特活性代谢产物(A771726)对豆蔻佛波醇乙酯(PMA)诱导的人单核细胞系(THP-1)细胞CD147、基质金属蛋白酶(MMP)-2及MMP-9表达的影响.方法 THP-1细胞悬浮生长于含10%胎牛血清的RPMI-1640培养液中,细胞密度达5×105/ml时用于实验.细胞无血清化处理12 h后,加入PMA和(或)不同剂量的A771726(5、15、45μg/ml),培养24 b,实时荧光定量聚合酶链反应(PCR)检测细胞CD147、MMP-2及MMP-9 mRNA的表达,流式细胞术检测细胞表而CD147的表达,明胶酶谱法检测细胞培养上清液中MMP-2、MMP-9的活性.多个样本均数比较采用单因素方差分析或Kruskal-Wallis秩和检验.结果 细胞经PMA刺激后CD147、MMP-2及MMP-9三者表达量均较与空白组有增高(P＜0.01).A771726干预后,细胞表面CD147平均荧光强度(MFI)有不同程度的下降,对照组MFI为109.5±3.8,A771726干预组(5、15、45μg/ml)MFI分别为73.3±2.5、64.5±2.3、40.9±2.7(P＜0.01);不同浓度A771726干预后MMP-2、MMP-9 mRNA表达量及细胞培养上清液中MMP-2、MMP-9活性与对照组比较均有不同程度的下降(P＜0.01).各干预组CD147 mRNA表达量与对照组比较,未见下降(P＞0.05).结论 来氟米特活性代谢产物A771726可以抑制PMA诱导的THP-1细胞CD147、MMP-2及MMP-9的表达.

Abstract：

Objective To investigate the effects of the leflunomide active metabolite (A771726) on the expression of phorbol-12-myristate-13-acetate (PMA) -induced CD147, matrix metallo-proteinase (MMP)-2 and MMP-9 on THP-1 cells. Methods THP-1 cells were cultured in RPMI-1640 medium supplemented with 10％ fetal bovine serum. For all experiments, THP-1 cells were cultured at an initial density of 5×105/ml. Before A771726 treatment, cells were cultured with serum-free RPMI-1640 medium for 12 h, THP-1cells were co-cultured with PMA at three different concentrations of A771726 (5, 15 , 45 μg/ml) for 24 h.The mRNA expression of CD147, MMP-2 and MMP-9 was measured by real-time PCR. CD147 expression on the cells were evaluated by flow cytometric analysis. The activity of MMP-2 and MMP-9 were evaluated by gelatin zymography. Statistical differences among the groups were tested by one-way ANOVA or KruskalWallis test. Results The expression of CD147, MMP-2 and MMP-9 were upgraded by the PMA. The expression of CD147 on THP-1 cells was inhibited significantly by A771726 in a dose-dependent pattern (P＜0.01). The mean fluorescence intensity (MFI) of CD147 in positive control group was 109.5±3.8, the MFI in A771726 (5, 15, 45 μg/ml) group were 73.3±2.5, 64.5±2.3, 40.9±2.7, respectively. The expression of MMP-2, MMP-9 mRNA and the activity of MMP-2, MMP-9 in the supernatant was inhibited significantly by A771726 (P＜0.01). The expression of CD147 mRNA was not inhibited significantly by A771726 (P＞0.05).Conclusion Leflunomide active metabolite (A771726) can inhibit the expression of PMA-induced CD147,MMP-2 and MMP-9 on THP-1 Cells.     

乙型肝炎相关肝癌外周血树突状细胞负载肿瘤抗原前后免疫功能的变化

目的探讨肝癌患者外周血单个核细胞(PBMC)来源树突状细胞(DC)表面分子表达及负载肿瘤抗原前后免疫功能变化与免疫逃逸的关系。方法分离18例乙型肝炎相关原发性肝癌、11例乙型肝炎肝硬化患者和10名健康献血者PBMC,体外培养,并加入重组人粒细胞巨噬细胞集落刺激因子(GM-CSF)和白细胞介素-4(IL-4)诱导DC。以共聚焦显微镜和扫描电镜观察形态,以流式细胞仪检测DC表面人类白细胞抗原(HLA)-DR、CD1a、CD80、CD83、CD86等分子表达水平。以HCCLM6肝癌细胞株制备肿瘤抗原,分别负载3种DC,最后以混合淋巴细胞反应(MLR)测定DC负载前后刺激同种异型T淋巴细胞增殖能力,并测定MLR上清液中IL-12的含量。结果肝硬化和肝癌组PBMC、DC得率低于正常组(P<0.05);HLA- DR、CD1a、CD80和CD86等分子表达水平也低于正常组(P<0.05);负载肿瘤抗原前肝硬化和肝癌组刺激同种异型T淋巴细胞增殖能力和MLR上清液中IL-12含量明显低于正常组,负载肿瘤抗原后3组均提高, 并以肝硬化组提高最为明显,但IL-12含量仍低于正常组。结论DC表型和功能缺陷可能是乙型肝炎病毒产生免疫耐受和肝癌细胞免疫逃逸的重要机制。肝硬化患者DC仍有一定功能。     

CpG-ODN联合HBsAg对慢性乙型肝炎患者外周血树突状细胞表型和功能的影响

目的　研究含非甲基化CpG基序的免疫刺激寡核苷酸 (CpG- ODN)与重组HBsAg对慢性乙型肝炎患者 (CHB)外周血树突状细胞 (dendriticcell ,DC)表型和功能的影响。方法　以重组人GM CSF、IL 4自CHB患者和健康者外周血单个核细胞诱导扩增DC ;以CpG ODN和HBsAg单独或联合刺激DC ,并与TNF α比较 ,评价其对DC表达表面分子HLA DR、CD86、CD1a ,分泌IL 12p70以及刺激同种T细胞增殖能力的影响 ;同时检测血浆TGF- β、IFN- γ含量。 结果　与PBS组比 ,CpG- ODN单用或联合HBsAg均能明显提高CHB患者DC表面分子HLA DR的表达 ,使IL- 12分泌增加 ,刺激同种T细胞增殖的能力亦增强 ,CpG ODN联合HBsAg尚能明显提高CD1a的表达 ;CpG- ODN的上述刺激作用类似于TNF α ;CHB患者血浆TGF- β、IFN -γ含量明显高于正常对照。 结论　CpG -ODN与TNF α一样能够促进CHB患者外周血DC分化和成熟 ;CpG- ODN与HBsAg联合刺激能协同增强DC的特异性抗原递呈作用 ;CHB患者的细胞因子环境可能是DC功能沉默的重要原因。     

前列腺素E1抑制慢性乙型重型肝炎树突状细胞成熟及CD4~+/CD8~+T细胞活性的观察

目的研究前列腺素E1对慢性乙型重型肝炎树突状细胞成熟及CD4+/CD8+T细胞活性的影响。方法抽取前列腺素E1治疗10 d前后的慢性乙型重型肝炎患者外周静脉血,密度梯度离心法分离淋巴细胞,贴壁培养获得PBMC,经重组人白细胞介素4(rhIL-4)、重组人粒-巨噬细胞集落刺激因子(rhGM-CSF)、加或不加前列腺素E1刺激培养8 d获得树突细胞(DC)。经流式细胞仪检测DC表达的HLA-DR、CD83、CD86,ELISA测定分泌的IFNγ、IL-12p70。悬浮T细胞部分检测CD4+/CD8+T细胞比例及其细胞表面CD69、HLA-DR表达;部分经IL-2培养,用于检测DC体外诱导的T淋巴细胞毒活性。结果前列腺素E1治疗慢性乙型重型肝炎,对患者CD4+/CD8+T细胞比例无明显影响,可抑制CD4+/CD8+T细胞活化分子CD69、HLA-DR的表达;前列腺素E1体外培养的DC低表达HLA-DR、CD83、CD86,分泌IFNγ、IL-12p70均下降,体外诱导的自体淋巴细胞毒活性减弱,与未加用前列腺素E1比较差异有统计学意义(P<0.01)。结论前列腺素E1治疗慢性乙型重型肝炎,可抑制CD4+/CD8+T细胞活化;体外培养可抑制DC成熟,诱导减弱自体淋巴细胞毒活性。     

髓源性树突状细胞过继转移诱导1型糖尿病小鼠免疫耐受及其机制

目的:探讨髓源性树突状细胞(DC)过继转移诱导1型糖尿病(IDDM)小鼠免疫耐受的作用及其机制.方法:体外培养BALB/c小鼠骨髓来源DC,测定纯度,经ip小鼠体内.随后,采用少量多次链脲佐菌素(STZ)ip的方法建立IDDM小鼠模型.每周测定血糖,第4周时处死动物,分离脾脏淋巴细胞并进行体外培养,MTT法测定小鼠脾淋巴细胞增殖反应,采用流式细胞术检测CD4 CD25 调节性T细胞.ELISA法测定血清IL-2,IL-4含量.结果:过继转移表达CD11c 的DC4wk后,小鼠的血糖可明显降低,与模型对照组有极显著差异(8.32±1.05mmol/Lvs18.36±1.55mmol/L,P<0.01).与模型对照相比,过继转移DC可使小鼠脾淋巴细胞增殖能力降低(0.264±0.019vs0.489±0.012,P<0.05),流式细胞术测定结果显示CD4 CD25 T细胞亚群比例上升到5.28%,而模型对照组仅1.56%.DC过继可有效抑制IL-2分泌(121±19ng/Lvs195±32ng/L,P<0.05),而提高IL-4含量(187±36ng/Lvs76±30ng/L,P<0.01).结论:过继转移髓源性DC可以诱导免疫耐受防止IDDM的发生,其机制与促进体内CD4 CD25 T细胞亚群产生,重建Th1/Th2细胞因子平衡相关.     

ADMA对单核细胞来源的树突状细胞成熟和免疫的影响

目的:通过观察非对称性二甲基精氨酸(ADMA)对树突状细胞(dendritic cells,DCs)成熟及免疫的影响来探讨AS形成的可能机制。方法:贴壁法分离人外周血单核细胞,在含重组人粒-巨噬细胞集落刺激因子(rhGM-CSF 20ng/ml)和重组人白细胞介素-4(rhIL-4,10ng/ml)的完全培养基中培养,五天后收集imDC,用1、8、16umol/L的ADMA干预未成熟DC 24h。用流式细胞术检测DC细胞表面分子的表达、吞噬能力及DC的凋亡,用混合淋巴细胞反应检测成熟DC刺激T淋巴细胞增殖的能力,用ELISA检测DC细胞因子的分泌。结果:生理浓度ADMA并不刺激DC成熟及分化;但病理浓度ADMA抑制DC成熟;抑制DC诱导的T淋巴细胞增殖;诱导DC凋亡:抑制DC分泌IL-12细胞因子、TNF-α及IL-10细胞因子。结论:生理浓度ADMA并不刺激DC成熟及分化;但病理浓度AD-MA抑制DC成熟和免疫。     

Effects of lamivudine on the function of dendritic cells derived from patients with chronic hepatitis B virus infection

AIM: To investigate if the nucleoside analogue lamivudine (LAM), a potent inhibitor of HBV replication, could restore the function of dendritic cells derived from patients with chronic hepatitis B (CHB) in an Asian population. METHODS: Dendritic cells (DCs) derived from mononuclearcytes of patients with chronic HBV infection were cultured in the presence of IL-4, granulocyte-macrophage colony-stimulating factors (GM-CSF) and gradient concentrations of LAM (0-2 mmol/L). Cell morphology was observed under light microscopy. Cell surface molecules, including HLA-DR, CD80, CD83, and CD1α, were analyzed with flow cytometry. The concentrations of IL-6 and IL-12 in the supernatant were assayed by ELISA. T cell proliferation was assayed by methyl thiazolyl tetrazolium (MTT). RESULTS: The expression of CD1α on DC treated with 0.5 mmol/L LAM (LAM-DC 0.5 mmol/L) was significantly higher than that of DC untreated with LAM (54.1 ± 4.21 vs 33.57 ± 3.14, P < 0.05), and so was the expression of CD83 (20.24 ± 2.51 vs 12.83 ± 2.12, P < 0.05) as well as the expression of HLA-DR (74.5 ± 5.16 vs 52.8 ± 2.51, P < 0.05). Compared with control group, LAM-DC group (0.5 mmol/L) secreted significantly more IL-12 (910 ± 91.5 vs 268 ± 34.3 pg/mL, P < 0.05), had lower levels of IL-6 in the culture supernatant (28 ± 2.6 vs 55 ± 7.36 pg/mL, P < 0.05), markedly enhanced the stimulatory capacity in the allogeneic mixed leukocyte reaction (MLR) (1.87 ± 0.6 vs 1.24 ± 0.51, P < 0.05).CONCLUSION: The lower expression of phenotypic molecules and impaired allogeneic mixed lymphocyte reaction function of dendritic cells derived from patients with HBV infection could be restored in vitro by incubation with LAM.     

负载肝癌细胞裂解物的树突状细胞Transgelin表达水平与其功能的关系

目的 探讨负载肝癌细胞裂解物的树突状细胞(DC)Transgelin表达与其表型和功能的关系.方法 正常人来源的DC分成3组,分别为负载高转移潜能肝癌细胞MHCC97H、低转移潜能肝癌细胞MHCC97L的裂解物组和无负载DC(对照)组.用共聚焦显微镜和扫描电子显微镜观察DC形态;流式细胞仪检测DC表型,混合淋巴细胞反应及其上清液中白细胞介素(IL)-12含量测定以反映DC功能;Western blot测定DC中Transgelin的表达.结果 3组DC的形态未有明显不同,负载低转移潜能肝细胞癌组DC的CD80、CD83、CD86、混合淋巴细胞反应和IL-12含量明显高于对照组(P<0.01);负载高转移潜能肝细胞癌组DC的CD80、CD86、Transgelin表达明显高于对照组(P<0.05);负载高转移潜能肝细胞癌组DC的CD80、CD83、CD86和IL-12含量明显低于低转移组(P<0.05),而Transgelin表达则高于低转移组.结论 负载肝细胞癌裂解物的DC中Transgelin表达与其表型和功能有关.     

过敏性哮喘患者树突细胞表型及分泌细胞因子的研究

目的观察过敏性哮喘患者树突细胞(DC)表达表面分子(CD1a、CD83、CD40、CD86)和分泌细胞因子(IL12和IL10)的情况,及对原始T细胞分化的影响。方法分别取过敏性哮喘患者(9例)和健康对照者(14例)外周血培养成熟DC。另取无哮喘家族史的新生儿脐血分离得到原始T细胞。将2组DC和原始T细胞共同培养。流式细胞仪测DC表面协同刺激分子CD1a、CD83、CD40、CD86的表达。ELISA测DC分泌的IL12、IL10及T细胞分泌的IFNγ、IL4的含量。结果哮喘组DC表达CD86分子比对照组显著升高(P<001)。哮喘组DC分泌IL12、IL12p40和IL10较对照组显著减少(P<001,P<005)。哮喘组T细胞释放IFNγ较对照组减少(P<005),释放IL4较对照组显著增多(P<001)。哮喘组IL12与IFNγ呈正相关(r=0758,P<005),与IL4呈负相关(r=-0756,P<005);IL10与IL4呈负相关(r=-0685,P<005);IL12与IL10呈正相关(r=0926,P<001)。结论过敏性哮喘患者DC存在缺陷,使原始T细胞向Th2优势分化,IL4等的释放增加,且不能有效地形成T细胞耐受,共同导致过敏性哮喘的发生。     

Entecavir up-regulates dendritic cell function in patients with chronic hepatitis B

AIM： To investigate the in vitro effect of entecavir （ETV on the function of dendritic cells （DCs） derived from chronic hepatitis B （CHB） patients. METHODS： Mononuclear cells were isolated from peripheral blood of patients with CHB. DCs wer incubated with RPMI-1640 medium supplemented wit fetal bovine serum, IL-4, granulocyte-macrophag colony-stimulating factor （GM-CSF）. DCs were treate with or without ETV on the fourth day. Cell surfac molecules, including CD1a, CD80, CD83 and HLA-DR were assessed by flow cytometry. Concentrations of IL- and IL-12 in the supernatant were assayed by enzyme linked immunosorbent assay （ELISA）. The ability of th generated DCs to stimulate lymphocyte proliferation wa observed. RESULTS： Compared with CHB control group, th expression levels of CD1a （29.07 ± 3.20 vs 26.85 ± 2.80 CD83 （25.66 ± 3.19 vs 23.21 ± 3.10）, CD80 （28.00 ± 2.7 vs 25.75 ± 2.51） and HLA-DR （41.96 ± 3.81 vs 32.20 ± 3.04） in ETV-treated group were higher （P 〈 0.05）. ETV treated group secreted significantly more IL-12 （157.6 ± 26.85 pg/mL vs 132.60 ± 22.00 pg/mL （P 〈 0.05） an had a lower level of IL-6 in the culture supernatant （83.0 ± 13.88 pg/mL vs 93.60 ± 13.61 pg/mL, P 〈 0.05） tha CHB control group. The ability of DCs to stimulate th proliferation of allogeneic lymphocytes was increase in ETV-treated group compared with CHB control grou （1.53 ± 0.09 vs 1.42 ± 0.08, P 〈 0.05）.CONCLUSION： Entecavir can enhance the biological activity of DCs derived from CHB patients.     

Dysfunction of peripheral blood dendritic cells from patients with chronic hepatitis B virus infection

AIM: To identify the property of dendritic cells (DCs) of peripheral blood monocytes (PBMC) in patients with chronic HBV infection. METHODS: Twenty patients with persistent HBV infection were included in this study, 10 healthy subjects being used as a control group. The peripheral blood mononuclear cells (PBMC) of T cell-depleted populations were incubated and induced into mature dendritic cells in the RPMI-1640 medium in the presence of cytokines GM-CSF, IL-4, FLt-3,TNF-alpha and 100mL.L(-1 )of fetal calf serum for a total of 10-12 days. The expressions of surface markers on DCs were evaluated using flow cytometric analysis. ELISA method was used to determine the cytokine levels of interleukin-12 (IL-12) and IL-10 in the supernatant produced by DCs. For detection of the stimulatory capacity of DCs to T cell proliferation, mytomycin C-treated DC were incubated with allogenic T cells. RESULTS: A typical morphology of mature DCs from healthy subjects and HBV-infected patients was induced in in vitro incubation, but the proliferation ability and cellular number of DCs from HBV-infected patients significantly decreased compared with healthy individuals. In particular, the expression levels of HLA-DR, CD80 (B7-1) and CD86 (B7-2) on DC surface from patients were also lower than that from healthy individuals (0.46 vs 0.92 for HLA-DR, 0.44 vs 0.88 for CD80 and 0.44 vs 0.84 for CD86,P<0.05). The stimulatory capacity and production of IL-12 of DCs from patients in allogenic mixed lymphocyte reaction (AMLR) significantly decreased, but the production level of nitric oxide (NO) by DCs simultaneously increased compared with healthy subjects (86 +/- 15 vs 170 +/- 22 micromol.L(-1), P <0.05). CONCLUSION: The patients with chronic HBV infection have the defective function and immature phenotype of dendritic cells, which may be associated with the inability of efficient presentation of HBV antigens to host immune system for the clearance of HBV.     

外周血CD+4CD+25T细胞表达在系统性红斑狼疮患者中的意义

目的了解系统性红斑狼疮(SLE)患者外周血CD4 CD2 5T细胞表达及其临床意义。方法用流式细胞仪检测53例SLE患者外周血CD4 CD2 5T细胞表达,根据CD25表达荧光强度>100者为CD4 CD25brightT细胞,并与SLE活动指数评分(SLEDAI)、血清补体C3水平、抗双链DNA抗体、抗核抗体滴度进行相关分析。结果SLE患者外周血CD4 CD2 5T细胞表达率为(7·84±1·85)%,显著低于对照组(9·18±2·01)%(P<0·05),且活动期组[(6·72±1·16)%]较稳定期组更低[(8·57±1·91)%,P<0·01]。外周血CD4 CD25brightT细胞表达率在活动期组[(0·85±0·24)%]和稳定期组[(0·91±0·25)%]之间相比差异无统计学意义(P=0·686),但均低于对照组[(1·43±1·08)%,P<0·01]。随治疗后SLEDAI评分的下降,活动期组SLE患者外周血CD4 CD25brightT细胞表达率无明显变化。进一步分析外周血CD4 CD25brightT细胞表达率与SLEDAI评分、抗核抗体、抗双链DNA抗体滴度和血清C3水平的相关性,分别为ρ=-0·188,P=0·178;ρ=-0·216,P=0·121;ρ=0·082,P=0·560;ρ=0·010,P=0·944,差异均无统计学意义(P>0·05)。结论外周血CD4 CD2 5T细胞的减少可能与SLE的发病有关。     

清热解毒法与疏肝健脾法对慢性乙型肝炎患者外周血树突状细胞功能的影响

目的:比较清热解毒法与疏肝健脾法对慢性乙型肝炎(CHB)患者外周血树突状细胞(DCs)成熟与功能的影响。方法:采集20例CHB患者和10例健康人的抗凝外周静脉血,分离外周血单个核细胞(PBMCs),体外培养使DCs增殖、成熟,大鼠清热解毒和疏肝健脾药物血浆干预;检测DCs表面HLA-DR、CD-1α、CD80及CD86的表达,DCs培养上清液IL-12的水平及DCs刺激同种异体T细胞增殖能力;比较干预前后DCs功能的变化。结果:清热解毒药物血浆、疏肝健脾药物血浆干预后CD80表达率升高,且疏肝健脾组大鼠CD80表达率的提高要超过清热解毒组,而HLA-DR、CD-1α、CD86的表达水平在干预前后差异无显著性意义。两组含药血浆干预后DCs刺激同种异体淋巴细胞增殖的能力提高,但两组药物血浆之间差异无显著性意义。两组含药血浆干预前后DCs分泌IL-12水平无明显变化。结论:清热解毒法和疏肝健脾法都能促进CHB患者DCs功能的恢复,疏肝健脾法对CHB患者DCs功能的影响更为显著。     

Systemic lupus erythematosus patients have increased number of circulating plasmacytoid dendritic cells, but decreased myeloid dendritic cells with deficient CD83 expression

Dendritic cells (DCs) are functionally abnormal in systemic lupus erythematosus (SLE). However, previous studies have involved in-vitro cytokine-induced DCs. In this investigation, directly isolated circulating plasmacytoid DCs (pDCs) and myeloid DCs (mDCs) in SLE were studied. Blood dendritic cell antigen (BDCA)-4 and BDCA-1 magnetic isolation kits were used to isolate blood pDCs and mDCs from 30 SLE patients and 36 controls. Their number and surface markers, and their relationship with lupus disease activity were evaluated. The percentage of pDCs per peripheral blood mononuclear cells was higher in SLE (0.33+/-0.14) than in controls (0.16+/-0.09, P<0.01), but that of mDCs was lower in SLE (0.43+/-0.14) than in controls (0.63+/-0.32; P<0.01). In controls, both pDCs and mDCs expressed high levels of MHC-II, however, the expression of CD86, CD83 and CCR7 on pDCs were significantly lower than that on mDCs (all P<0.05). mDCs from patients with SLE, particularly those with active disease, expressed lower CD83 than controls. In health, circulating mDCs may be more efficient than pDCs in stimulating T cells. In SLE, the increased number of circulating pDCs supports a pathogenic role for these cells, and the decreased mDC number and CD83 expression may explain the susceptibility to infections in these patients.