负载HBcAg对慢性HBV感染患者树突状细胞的活化作用及功能影响

目的:探讨免疫耐受期慢性乙型肝炎(CHB)患者外周血树突状细胞(DC)负载HBcAg后细胞表型及免疫功能的改变。方法:从CHB免疫耐受期患者外周血分离培养DC,在DC成熟前,加入重组HBcAg表位肽,诱导HBV特异性DC分化成熟,流式细胞仪检测DC表面共刺激分子CD1a、CD80、CD83的表达水平,应用淋巴细胞增殖试验评估DC功能。结果:负载不同剂量的HBcAg后,DC细胞活化增强,DC细胞共刺激分子标志物CD1a、CD80以及CD83表达率均明显上升,且随着抗原负载剂量的增加,表达率进一步增加,各组之间差异具有统计学意义(均P<0.001);未负载HBcAg的DC细胞激活的淋巴细胞反应较弱,负载HBcAg的DC细胞刺激同种异体健康成人T淋巴细胞增殖能力增强,且随着负载抗原剂量的加大,T淋巴细胞的增殖能力进一步提高,与未负载抗原的对照组相比,差异具有统计学意义(F=428.14,P=0.000)。结论:体外负载HBcAg刺激CHB患者DC细胞可增强其有效抗原提呈能力,促进T淋巴细胞增殖。     

HBsAg、HBcAg活化树突状细胞治疗慢性乙型肝炎的体外研究

目的 研究慢性乙型肝炎患者外周血树突状细胞(DC)经HBsAg、HBcAg活化后的免疫功能.方法 从慢性乙型肝炎患者外周血中培养扩增DC,在DC成熟前,加入纯的HBsAg、HBcAg刺激,用流式细胞仪检测DC表型,用液闪计数仪观察DC对T细胞的增殖作用,用ELISA法检测混合淋巴细胞反应(MLR)中细胞因子的分泌水平.结果 经HBcAg刺激DC的CD86表达率为(92.14±5.12)%,明显高于HBsAg刺激组和未加抗原组(P＜0.01);经HBcAg刺激组DC诱导同种异体静止T细胞增殖的能力每分钟液闪计数值(cpm)为34259±3127,明显高于HBsAg刺激组(20258±2917)和单个核细胞组(3469±417),P＜0.01;经HBcAg刺激组DC MLR中IL-12浓度为(342±42.3)ng/L,分别高于HBsAg刺激组和未加抗原组(P＜0.01).结论 体外经HBcAg刺激DC可有效提呈抗原病毒,并可进一步刺激T细胞产生.     

慢性乙型肝炎患者在HBV不同抗原负载下树突状细胞功能的变化

目的观察在不同HBV抗原负载下树突状细胞(DC)功能的变化及在核苷(酸)类药物抗病毒治疗后DC的功能变化。方法分离17例慢性乙型肝炎患者外周血单个核细胞(PBMC),并在不同抗原负载下(HBsAg、HBcAg、HBsAg联合HBcAg)诱导DC分化成熟,用流式细胞技术测定DC表面共刺激分子CD80、CD83、CD1a及HLA-Ⅱ类分子HLA-DR表达水平,同时用淋巴细胞增殖试验评估DC功能。结果与负载HBsAg诱导相比,HBcAg、HBsAg联合HBcAg诱导下DC共刺激分子表达明显增强(HLA-DR:85.12±1.55比98.37±1.27比99.21±1.33;CD1a:15.69±2.46比16.25±2.33比42.20±1.10;CD80:71.88±6.38比80.74±3.23比94.70±2.77;CD83:32.64±2.77比42.55±2.88比44.16±1.89)。淋巴细胞增殖试验提示DC功能改善更显著,尤其HBsAg联合HBcAg诱导DC功能改善更加明显(HBV DNA阳性:7.29±0.17比7.99±0.43比8.56±0.31;HBV DNA阴性:7.48±0.30比8.22±0.41比8.78±0.31)。将17例慢性乙型肝炎患者在核苷(酸)类药物抗病毒治疗前后DC功能进行比较,经抗病毒治疗在充分抑制HBV DNA复制的情况下,DC功能的恢复更趋于完善(HLA-DR:99.21±1.33比99.82±2.67;CD1a:42.20±1.10比71.33±5.89;CD80:94.70±2.77比96.42±3.56;CD83:44.16±1.89比68.34±2.11)。结论 HBsAg联合HBcAg诱导DC细胞功能明显得到恢复和增强,HBV DNA阴性时诱导自体DC功能恢复更趋完善。     

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。     

慢性乙型肝炎患者外周血树突状细胞功能的研究

目的研究慢性乙型肝炎患者外周血树突状细胞(DC)的免疫功能.方法从慢性乙型肝炎患者外周血中分离单个核细胞,用无血清培养法分离培养DC,用流式细胞仪检测DC表型,用液闪计数仪观察DC对T细胞的增殖作用,用ELISA法检测混合淋巴细胞反应(MLR)中细胞因子的分泌水平.结果患者组DC的CD86的表达率为(70.2±5.2)%,明显低于正常人组(95.3±3.8)%,P＜0.01;其诱导T细胞增殖能力每分钟液闪计数cpm为10000±2000,明显低于正常人组(cpm为30000±3000),P＜0.01患者MLR中IL-12为(120.0±19.7)pg/ml,γ-干扰素为(799.0±161.3)pg/m1,明显低于正常人组的(280.0±41.1)pg/ml和(3359.0±635.4)pg/ml,P＜0.01.结论慢性乙型肝炎患者外周血DC免疫功能低下,并与DC表面CD86的表达率下降及DC分泌IL-12减少密切相关.     

慢性乙型肝炎患者树突状细胞的培养鉴定和功能特点

目的：研究慢性乙型肝炎患者树突状细胞（DC）的功能特点,探讨其与肝炎发病机制的关系。方法：分离获得18例慢性乙型肝炎患者和10例正常人外周血单个核细胞（PBMC）,在体外培养条件下,加入细胞因子重组人粒细胞巨噬细胞集落刺激因子（GM－CSF）,IL－4,胎肝酪氨酸激酶受体的配体（FLt3-L)和肿瘤坏死因子α（TNFα）,使DC细胞增殖,成熟,用流式细胞仪检测DC的表面标志,同时检测DC在混合淋巴细胞反应（MLR）中的刺激能力和细胞因子的分泌。结果：DC在体外经细胞因子的刺激可明显增殖,但慢性乙型肝炎患者DC的增殖速度低于正常人;DC表面标志人组织相容性复合物Ⅱ类分子（HLA－DR）,CD－80（B7－1）,CD－86（B7－2）和CD－1α的表达较正常对照组均明显降低（P＜0．001）,尤以CD－1α的降低更为显著,DC在MLR中的刺激能力亦明显低于正常对照。并且与正常对照相比,其产生的IL－12水平降低,而NO水平却增高（P＜0．05）。结论：慢性乙型肝炎患者DC的表型不成熟和功能的缺失,由此导致IL－12的产生和刺激T细胞增殖能力的降低,可能是HBV感染持续发展的原因之一。     

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．     

负载肿瘤抗原的DC体外诱导抗肿瘤免疫反应的实验研究

目的 研究自体及同种异体树突状细胞(DC)体外负载肿瘤抗原后刺激T淋巴细胞增殖及诱导抗肿瘤免疫反应的能力.方法 利用细胞因子诱导人骨髓单个核细胞生成DC,尼龙毛柱法分离T淋巴细胞,3H-TdR掺入法检测负载肺癌细胞凋亡小体的自体及同种异体DC体外刺激T细胞增殖反应,乳酸脱氢酶(LDH)释放法检测负载肺癌细胞凋亡小体的自体及同种异体DC刺激的T细胞对肺癌细胞和乳腺癌细胞系MCF-7的杀伤作用.结果 骨髓细胞诱生的自体及同种异体DC负载肿瘤抗原后,均具有刺激T淋巴细胞增殖的能力,负载肿瘤抗原的自体及异体DC激活的T淋巴细胞后均可杀伤两种靶细胞,T细胞对MCF-7的杀伤力明显低于对患者肺癌细胞的杀伤力. 结论人自体或异体DC体外负载细胞性肿瘤抗原后,可有效地刺激T淋巴细胞的增殖,产生特异性肿瘤杀伤作用.     

PTD-HBcAg体外诱导小鼠髓源性树突状细胞成熟及在T淋巴细胞增殖中的作用

目的 观察融合蛋白PTD-HBcAg诱导体外培养的小鼠髓源性树突状细胞(DC)成熟及对T淋巴细胞增殖的作用.方法 体外分离培养近交系BALB/C小鼠髓源性DC加入重组粒细胞-巨噬细胞集落刺激因子(rgM-CSF)、重组IL-4培养5 d,再加人TNF-a、HBcAg和PTD-HBcAg诱导DC成熟.激光共聚焦显微镜观察免疫荧光在细胞中的分布及定位,流式细胞计数仪测定DC表面分子表达,ELISA法测定DC培养上清液中IL-12 p70的水平,CCK-8试剂盒检测T淋巴细胞增殖反应.组间数据比较采用t检验.结果 成功体外诱导培养小鼠髓源性DC,HBcAg主要定位于DC膜表面,而PTD-HBcAg能够穿透DC膜进入细胞质.PTD-HBcAg能明显上调DC表面分子CD80、CD86和主要组织相容性复合体(MHC)II类分子表达;50 mg/L和100 mg/L PTD-HBcAg诱导DC分泌IL-12 p70水半分别为(142.50±18.31)ng/L和(124.30±15.12)ng/L,明显高于HBcAg诱导组的(42.31±4.21)ng/L(t=9.234和9.045,均P＜0.05);PTD-HBcAg诱导DC刺激T淋巴细胞增殖能力明显高于HBcAg组及阳性对照TNF-a组.结论 PTD-HBcAg具有穿透DC膜能力,并能促进DC分化、成熟,明显上调表面共刺激分子表达,增强DC刺激T淋巴细胞增殖能力及分泌IL-12 p70的水平.     

树突状细胞负载肝癌相关抗原后成熟调控的研究

目的 研究树突状细胞（DC）负载肝癌相关抗原后的成熟调控。方法 用SDS－PAGE制备电泳纯化牛结核分枝杆菌热休克蛋白70，用其诱导DC的分化与成熟。结果 DC负载肝癌可溶性抗原后，10％2细胞失去了DC特征，同时其表面CD54（90．0％），CD83（78．0％），CD86（85．0％）分子表达下降；牛分枝杆菌卡介苗－热休克蛋白70（BCG HSP70）的活化有利于负载肝癌可溶性抗原后的DC维持其特异性标志，同时DC表面CD54（92．0％），CD83（90．0％），CD86（91．0％）分子表达增加，DC诱导同种异体淋巴细胞转化的能力增加，淋巴细胞增殖加快，从而促进DC成熟，增加其抗原呈递能力。结论 预示BCG HSP70有可能成为促进DC活化和成熟的另一重要分子。     

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.     

肝癌细胞裂解物致敏的树突状细胞瘤苗体外诱导特异性抗肝癌免疫

目的 探讨肝癌患者肿瘤细胞裂解物致敏的树突状细胞(DC)瘤苗体外诱导自体T淋巴细胞特异性抗肝癌免疫效应。 方法 从肝癌患者外周血单个核细胞中诱导D C,用重组人粒细胞-巨噬细胞集落刺激因子(rhGM-CSF)和白细胞介素-4(rhIL-4)刺激活化,经自体肝癌细胞裂解物致敏。用流式细胞仪检测D C细胞表面分子的表达,酶联免疫吸附法检测T淋巴细胞培养上清液中干扰素(I F N)γ和白细胞介索-12(IL-12)的含量,液体闪烁计数仪测定肝癌细胞裂解物致敏的D C刺激自体T淋巴细胞增殖效应,四甲基偶氮唑盐法检测肝癌细胞裂解物致敏D C诱导的细胞毒T淋巴细胞对自体肝癌细胞的特异性杀伤作用。 结果 肝癌细胞裂解物致敏的DC瘤苗可上调DC表面CD1 a、CD40、CD86和人类白细胞抗原-DR分子表达水平,其与T淋巴细胞共培养产生的IFN γ、IL-12的浓度明显高于未致敏的D C组(t值分别为2.30、2.14,P<0.05),肝癌细胞裂解物组(t值分别为14.01、15.40,P<0.01)和对照组(t值分别为14.85、16.87,P<0.01)。同时肝癌细胞裂解物致敏的瘤苗可明显诱导T淋巴细胞的增殖,其诱导的细胞毒性T淋巴细胞对自体肝癌细胞的杀伤率(81.72％±9.49％)显著高于对HepG2的杀伤率(49.37％±11.21％)和人鼻咽癌肿瘤细胞的杀伤率(17.14％±5.65％),P<0.01。 结论 肝癌细胞     

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.     

Dendritic cells are functionally defective in multiple myeloma: the role of interleukin-6

We studied concentration, phenotype, and function of peripheral blood (PB) dendritic cells (DCs) from patients with multiple myeloma (MM). The absolute number of circulating precursors of myeloid and plasmacytoid DCs was significantly lower in MM patients than in healthy subjects. After maturation, PBDCs from MM patients showed significantly lower expression of HLA-DR, CD40, and CD80 antigens and impaired induction of allogeneic T-cell proliferation compared with controls. Remarkably, they were not capable of presenting the patient-specific tumor idiotype to autologous T cells. Conversely, DCs generated in vitro from CD14(+) monocytes from the same patients, and PBDCs freshly isolated from healthy donors efficiently stimulated allogeneic and autologous T cells. To clarify the mechanism of PBDC deficiency in MM, we investigated the effects of the main plasma cell growth factor, interleukin-6 (IL-6), on the development of DCs from CD34(+) cells. IL-6 inhibited the colony growth of CD34(+) DC progenitors and switched the commitment of CD34(+) cells from DCs to CD14(+) CD1a(-) CD86(-)CD80(-) CD40(+/-)HLA-DR +/- monocytic cells exerting potent phagocytic activity but no antigen-presentation capacity. This effect was reversed by anti-IL-6 antibodies. Growing CD34(+) cells in the presence of autologous serum (without IL-6) also suppressed the development of functional DCs. This study demonstrates that PBDCs from MM patients are functionally defective, partially because of IL-6-mediated inhibition of development. This brings into question the advisability of using PBDCs as antigen carriers for immunotherapy trials in MM. The results also suggest a novel mechanism whereby myeloma cells escape immune recognition.     

Down-regulation of β-centractin might be involved in dendritic cells dysfunction and subsequent hepatocellular carcinoma immune escape: a proteomic study

Aims Proteomic study was used to clarify the mechanism of hepatocellular carcinoma (HCC) immune escape concerning Dendritic cells (DCs’) dysfunction and their association with HCC invasion. Methods Human peripheral blood mononuclear cells (PBMCs) derived DCs from healthy donors were pulsed with soluble cell lysates prepared from different metastatic potential human HCC cell lines. The total protein of these DCs was analyzed by two-dimensional electrophoresis and Electro-Spray Mass Spectrometry. The allostimulatoy capacity and phenotype of these DCs were also evaluated. The clinical significance of β-centractin, one of the largest quantitative changed spot, down-regulation in DCs was further evaluated in autologous PBMCs derived DCs pulsed with auto-tumor lysates in 26 HCC patients. Results The expression of β-centractin was found to be considerably lower either in DCs pulsed with HCCLM6 (high metastatic potential HCC cell line) lysates, accompanied by down-regulation of CD86 molecule and impaired allostimulatory capacity, than those of DCs pulsed with lysates from HCC cell lines with low or without metastatic potential or in DCs pulsed with lysates from HCC with invasiveness than those without invasiveness. Conclusions The down-regulation of β-centractin in DCs pulsed with high metastatic potential HCC lysates might associate with DCs dysfunction and HCC invasiveness. Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users. Yong-Qiang Weng and Shuang-Jian Qiu contributed equally to the work.     

肝癌细胞裂解物致敏的树突状细胞瘤苗预防肝癌术后转移复发

目的探讨人自体肝癌细胞裂解物致敏的树突状细胞(D C)瘤苗预防肝癌术后转移复发的价值。方法从肝癌患者外周血单核细胞中诱导D C,用重组人粒细胞-巨噬细胞集落刺激因子(rhGM-CSF) 和重组人白细胞介素-4(rhIL-4)刺激活化,经自体肝癌细胞裂解物致敏D C制备瘤苗。将3 0例肝癌术后患者随机分为D C瘤苗治疗组1 5例,对照组1 5例。对两组病例治疗前后免疫功能、临床疗效、肿瘤转移复发率及生存率进行观察比较。结果DC瘤苗治疗后外周血CD 3 、CD4 /CD 8 及自然杀伤细胞比率较治疗前明显升高(P<0.0 5),且明显高于对照组治疗后的相应水平(P<0.05)。DC瘤苗治疗后血清IL-1 0水平明显下降(P<0.0 5)。随访18个月,DC瘤苗治疗组的转移复发率为13.3 3%,明显低于对照组53.33%(P <0.05);而治疗组的生存率为93.33%,明显高于对照组60.00%(P<0.05)。结论肝癌术后行自体肝癌细胞裂解物致敏的DC瘤苗治疗,可改善患者的免疫功能,降低肿瘤转移复发率,提高患者术后生存率,为肝癌的免疫治疗开辟一条新途径。     

CD40ligand-expressing dendritic cells induce regression of hepatocellular carcinoma by activating innate and acquired immunity in vivo

Dendritic cells (DCs) are professional antigen-presenting cells able to prime T-cells against tumor-associated antigens (TAA), but their potential to induce hepatocellular carcinoma (HCC) regression is still limited. CD40/CD40L interaction is essential for DC activation and induction of antigen-specific T-cells. In this study, transduction of TAA-pulsed DC with a CD40L-encoding adenovirus (Ad-CD40L) was used to improve the immune response induced by DC toward HCC. Bone marrow-derived DC from C3H/HeNcrl mice were cultured with granulocyte-macrophage colony-stimulating factor and interleukin-4. On day 6, tumor-lysate pulsed DCs were infected with adenoviruses. HCCs were induced by inoculation of mice with Hepa129-cells subcutaneously. When tumor-volume was 100 to 400 mm(3), DCs were injected intratumorally, subcutaneously, or intravenously. Ad-CD40L transduction exerted CD40/CD40L interactions between DCs, increasing DC immunostimulation with up-regulation of CD80/CD86- and interleukin-12 (IL-12) expression. Intratumoral injection of CD40L-DC was superior to intravenous or subcutaneous treatments, yielding tumor elimination in almost 70% of mice. Moreover, all tumor-free animals were protected against hepatic tumor cell rechallenge. In a preventive setting, subcutaneous injection of CD40L-expressing DCs protected 50% of mice for more than 3 months toward tumor cell challenge. The induced immune response seemed to be dependent on cross-priming with Th1-lymphocytes in the lymph nodes, because transduced DCs were redetected in lymphoid tissues. In addition, immunohistochemistry of tumors indicated a significant tumor infiltration with CD4+, CD8+ T cells and natural killer (NK) cells. Tumor-infiltrating lymphocytes were tumor-specific, as shown in interferon-gamma (IFN-gamma) enzyme-linked immunosorbent spot and T-cell proliferation assays. CONCLUSION: Transduction of DCs with Ad-CD40L increases significantly the stimulatory capacity of DCs. Intratumoral injection of DCs activates both acquired and innate immunity, inducing complete regression of established tumors and long-term immunity against tumor recurrence. This approach improves the antitumoral potential of DCs.     

慢性乙型肝炎患者树突状细胞功能与单个核细胞乙型肝炎病毒共价闭合环状DNA的关系

目的 探讨慢性乙型肝炎(CHB)患者外周血单个核细胞(PBMC)及树突状细胞(DC)内HBV共价闭合环状DNA(HBV cccDNA)的存在状况,DC成熟度及功能状态与DC或PBMC中HBV cccDNA载量的关系.方法 分离29例CHB患者和10例健康对照者的PBMC,用重组人粒细胞-巨噬细胞集落刺激因子(GM-CS...     

来氟米特对狼疮患者树突状细胞作用机制的初探

目的　探讨来氟米特(LEF)处理前后系统性红斑狼疮(SLE)患者树突状细胞(DC)表面标志及功能的改变,揭示LEF治疗SLE的作用机制,为开展“抑制性DCs”治疗SLE奠定实验基础。方法　(1)分离SLE患者外周血单核细胞,用细胞因子诱导DC成熟, LEF组再加入A7717262(来氟米特的活性代谢产物)培养。第9天收集DC细胞,流式细胞仪检测CD80、CD83、CD86和HLA DR的表达。(2)分别将A771726处理或不处理的第9天DC和T细胞进行培养, 72h后用MTT法检测DC刺激淋巴细胞增殖的能力,FACS检测T细胞亚群和ELISA检测培养上清中IL 10和IFNγ水平。结果A771726处理后虽DC形态无改变,但DC表达CD83、CD86和HLA DR百分数较对照组均明显降低(72 70±1 77vs 79 36±4 80, 63 50±14 06vs. 83 91±9 81, 80 44±12 56vs. 90 51±8 63,P值均<0 01)。A771726处理后的DC,其刺激T细胞增殖相应的吸光度值明显降低,混合培养的上清液中IL 10水平较无A771726处理的DC与T细胞的混合培养上清液明显降低,而IFNγ两者间无显著差异;但见CD 4 CD 25CTLA 4 T细胞百分比增高。结论　LEF在体外可抑制SLE患者外周血DC的成熟;未成熟DC能抑制T细胞增殖及T细胞向Th2 细胞转化,诱导CD 4 CD 25CTLA 4 T细胞产生,从而纠正SLE患者的部分免疫紊乱。