IL-24基因修饰增强CIK细胞对HL-60细胞的细胞毒作用

目的:研究IL-24基因修饰的CIK细胞与同源树突状细胞共培养后对白血病细胞的杀伤作用及其机制.方法:从健康人外周血单个核细胞中常规诱导DC和CIK 细胞,电穿孔法将IL-24基因导入CIK细胞中(获得细胞为CIK-IL24),RT-PCR 和ELISA法检测CIK细胞中IL-24基因的表达,FCM和ELISA法检测转基因前后CIK表型及分泌细胞因子能力的变化,将CIK 细胞和同源DC共培养,FCM法检测共培养的DC-CIK细胞对HL-60细胞细胞毒活性的变化.结果:通过电穿孔法成功将IL-24基因导入CIK细胞,与对照组相比,转IL-24基因后CIK细胞中CD3~+、CD3~+CD56~+细胞的比例无明显改变,CD4~+CD25~+细胞比例显著下降.IL-24可上调CD3+CD56+细胞表面粘附分子CD54、CXCR4的表达,转染IL-24基因后CIK分泌TNF-α和IFN-γ的能力显著增强,与DC共同作用HL-60细胞时转染IL-24基因后的CIK细胞细胞毒活性明显增强.结论:通过IL-24基因修饰,明显增强了CIK细胞对HL-60细胞的杀伤能力,其机制与IL-24促进CIK分泌TNF-α、IFN-γ,上调CIK细胞表面粘附分子的表达,减少CD4~+CD25~+调节性T细胞比例等密切相关.     

IL-24基因修饰的树突状细胞促进CIK细胞对肺癌细胞的杀伤作用

Objective To study the antitumor effect and mechanism of co-cultured cytokine-induced killer(CIK) cells and autologous DC modified with IL-24 gene on A549 cells in vitro. Methods DC and CIK cells were prepared routinely from human peripheral blood mononuclear cells(PBMC). Recombinant adenovirus vector pAdEasy-1-pTrack-CMV-IL-24 was extracted from DH5α, it was lineared with Pac I and transfected into A293 cells, and then the IL-24 recombined adenovirus(Ad-IL-24) was obtained. Ad-IL-24 was used to infect DC. The cells obtained were named DC-IL-24. RT-PCR and ELISA were used to evaluate the expression of IL-24 gene in transfected DC. The phenotypes change of DC were identified by flow cytometry analysis, the concen-tration of IL-12 and TNF-α in supernatant of DC were determined by EIJSA. The ability of CIK producing per-forin was measured by homolysis method. FCM was used to determine the cytotoxicity of cocultured CIK cells and autologous DC modified with IL-24 gene to A549 cells. Results We obtained the high titre of Ad-IL-24.IL-24 gene was transfered into DC successfully via Ad-IL-24. The green fluorescence was observed on DC by fluorescence microscope. The expression rate of CD80, CD83, HI.A-DR, CD40, CXCR4 on DC-IL-24 was sig-nificantly increased compared with that of the control group. DC-IL-24 produced markedly higher levels of IL-12 and TNF-α as compared with DC. DC-IL-24 can enhance the ability of CIK cells producing perforin. On com-parison with non-transfected DC co-cultured with CIK cells, transfected DC co-cultured with CIK cells had a sig-nificantly higher lytic activity against A549 cells. Conclusion IL-24 gene modification can enhance the anti-tu-moral immunity of DC. The mechanism of which might be related to the increased secretion of IL-12 and TNF-α, up-regulation expression of co-stimulatory molecules and MHC Ⅱ class molecules on DC, promoting the acti-vation and maturation of DC, and then enhancing CIK cells to generate specific anti-tumoral immunity.     

黄芪多糖诱导的树突状细胞增强CIK细胞的杀伤作用

目的:观察黄芪多糖(Astragalus polysaccharides,APS)对树突状细胞(Dendritic cell,DC)抗原提呈功能的影响,并和同源CIK(Cytokine induced killer)细胞共培养,观察DC-CIK和黄芪多糖诱导DC-CIK细胞杀伤A549肺腺癌细胞的活性.方法:提取健康供血者的外周血单个核细胞(PBMC),常规诱导出DC与CIK细胞后,将其共培养,观察黄芪多糖对DC表型变化的影响,定量检测DC-CIK和黄芪多糖诱导DC-CIK细胞培养上清中的IFN-γ和IL-12;并用MTT法测定其体外细胞毒活性.结果:黄芪多糖能提高DC表面分子CD40、CD80、HLA-DR的表达,经黄芪多糖诱导的DC活化的CIK,对A549肺腺癌细胞的杀伤活性高于单纯DC-CIK细胞,差异显著(P＜0.05).结论:黄芪多糖能增强DC的抗原提呈功能,证实黄芪多糖诱导的DC能明显提高CIK对肿瘤细胞的杀伤活性,具有更广阔的应用前景.     

CIK细胞对A549肺癌细胞株的抗增殖及诱导凋亡作用的形态学研究

目的 研究多种细胞因子诱导的杀伤细胞(CIK)对A549肺癌细胞株的抗增殖和诱导凋亡作用.方法 应用MTT法检测CIK细胞对肺癌细胞株的抗增殖作用的影响及细胞毒活性;通过倒置显微镜、HE染色、AO/EB荧光染色、透射电镜观察凋亡细胞的形态学改变.结果 MTT比色法表明随着CIK细胞与肺癌细胞效靶比增加及作用时间延长,抑制率明显增强(P<0.01).CIK细胞作用于肺癌细胞24 h后,形态学观察肺癌细胞发生凋亡或坏死.结论 体外制备的CIK细胞对肺癌A549细胞具有抑制增殖和促进凋亡作用.     

DC-CIK细胞体外抗淋巴瘤细胞的免疫效应研究

目的:探讨共培养树突状细胞(Dendritic cell,DC)和细胞因子诱导的杀伤细胞(Cytokine-induced killer cell,CIK),即产生的DC-CIK细胞抗淋巴瘤免疫效应的机制。方法:分离健康人外周血单个核细胞,分别于体外诱导DC和CIK,然后共培养成DC-CIK细胞。分四组:DC组、DC-T组、CIK组和DC-CIK组。对各组分别进行免疫机制研究:测定细胞因子IL-12、IL-17和IFN-γ的分泌量、检测细胞免疫表型和分析对人淋巴瘤细胞株杀伤活性。结果:在DC-CIK组,细胞因子IL-12、IL-17和IFN-γ的分泌量均明显高于其它三组(P0.05);杀伤活性亦较其它组增强(P0.05)。CD8+、CD3+/CD56+细胞在DC-CIK组亦明显增加(P0.05)。结论:DC-CIK细胞抗淋巴瘤免疫效应与分泌大量的细胞因子和产生细胞毒性细胞有关。     

自体肿瘤抗原致敏的树突状细胞联合细胞因子诱导的杀伤细胞治疗晚期肾癌的疗效观察

目的探讨负载自体肿瘤抗原的树突状细胞(DC)联合细胞因子诱导的杀伤细胞(CIK细胞)在晚期肾癌治疗中的临床疗效,并监测患者的免疫状态及不良反应。方法回顾分析2011-01/2013-12期间在我科治疗的82例晚期肾癌患者,单采其外周血单个核细胞(PBMC),其中贴壁细胞经体外诱导产生DC,并负载自体肿瘤细胞裂解物(Ag)制备Ag-DC;T淋巴细胞经体外诱导产生CIK细胞,将Ag-DC与CIK细胞共培养制备Ag-DC-CIK瘤苗,检测DC表面分子的表达及IL-12的分泌,监测CIK细胞增殖情况,并将Ag-DC-CIK分次回输给其中41名患者,以41例单纯的CIK细胞治疗作为对照,治疗2疗程后,检测患者外周血细胞因子水平及T细胞亚群变化,结合影像学等检查综合评价疗效,同时观察不良反应。结果负载肿瘤细胞冻融抗原的DC,高表达CD11c、CD83、CD86、HLA-DR表面分子,IL-12的分泌显著增加。Ag-DC与CIK细胞共培养后,可明显刺激CIK细胞的增殖,同时CD3+CD8+细胞及CD3+CD56+细胞的含量明显增加,此外,Ag-DC-CIK瘤苗的临床疗效明显高于单纯CIK细胞治疗组,2组均未发生严重的不良反应。结论晚期肾癌PBMC来源的DC负载自身肿瘤细胞冻融抗原能提高晚期肾癌患者的免疫状态。     

腺病毒介导的IL-24增强紫杉醇对A549肺腺癌细胞生长的抑制作用

目的探讨腺病毒介导的白细胞介素24(Ad-IL-24)联合紫杉醇对体外培养的人肺腺癌A549细胞生长的影响。方法用Ad-IL-24、紫杉醇、Ad-IL-24联合紫杉醇处理A549细胞,以CCK-8法测定细胞生长抑制率,流式细胞术检测细胞凋亡和周期的变化。结果 Ad-IL-24可明显抑制人肺腺癌A549细胞生长并诱导细胞凋亡,与紫杉醇联合处理后,其抑制肺癌细胞生长及诱导细胞凋亡作用明显优于单用紫杉醇组及Ad-IL-24组,并引起G2/M期阻滞。结论 Ad-IL-24感染肺癌A549细胞可增强紫杉醇对肿瘤细胞生长的抑制作用。     

骨髓瘤细胞裂解物致敏的DC-CIK细胞抗骨髓瘤细胞作用

目的:研究负载骨髓瘤细胞裂解物的健康供者树突状细胞(Dendritic cells,DCs)联合细胞因子诱导杀伤细胞(Cytokine induced kil1er cells,CIK)体外对骨髓瘤U266细胞杀伤作用的影响。方法:通过血细胞分离机采集健康供者单个核细胞100 ml用于体外培养,选取贴壁细胞进行DC细胞培养,悬浮细胞用于CIK细胞培养,DC细胞培养7日后用骨髓瘤U266细胞裂解物致敏,然后与CIK细胞共培养7日,用倒置显微镜、扫描电镜观察细胞形态,流式细胞仪检测细胞表型,乳酸脱氢酶释放法检测共培养细胞对U266细胞杀伤作用。结果:CIK细胞大部分形态为圆形,少数梭形,DC细胞有典型细胞突起,流式细胞仪分析培养的CIK细胞高表达CD3,培养后CD3和CD56共表达细胞明显升高,在致敏后DC细胞表达CD86、CD80,共培养细胞对U266细胞杀伤作用强于单独CIK细胞作用。结论:瘤细胞裂解物致敏的健康供者DC-CIK细胞能显著提高对瘤细胞的杀伤性,在患者干细胞移植后是否可应用以清除残留病变,值得进一步研究应用。     

R848联合Poly(I:C)促进DC抗原呈递和增强T细胞杀伤效果的研究

目的:研究R848联合聚肌胞苷酸[Poly(I:C)]对树突状细胞(DC)成熟的影响及DC诱导的细胞毒性T淋巴细胞(CTL)对人肺腺癌A549细胞的杀伤作用。方法:分离人外周血单个核细胞,诱导其成为DC,用A549细胞裂解物即肿瘤细胞裂解物(TCL)作为抗原,R848(Toll样受体7/8激动剂)联合Poly(I:C)(Toll样受体3激动剂)作用于DC,流式细胞术分析DC表面共刺激分子;将抗原刺激活化后的DC与T淋巴细胞混合培养7 d,收集培养上清液和CTL,检测上清液中白细胞介素12(IL-12)p70、干扰素γ(IFN-γ)和肿瘤坏死因子α(TNF-α)的含量;CTL与肺腺癌A549细胞共培养16 h,观察其杀伤效果。结果:DC-R848+Poly(I:C)组DC表面CD83和CD80的表达较DC-TCL组显著提高(P0.01);同时可明显刺激DC分泌IL-12 p70(P0.01);此外,DC-R848+Poly(I:C)组较DC-TCL组对肺腺癌A549细胞杀伤效果亦显著提高(P0.01);DC-R848+Poly(I:C)组IFN-γ和TNF-α的分泌水平较DC-TCL组均显著提高(P0.01)。结论:R848联合Poly(I:C)作用于DC可显著促进其成熟、活化,并增强其抗原呈递作用及CTL对肺腺癌细胞的特异性杀伤作用。     

IL-24对非小细胞肺癌患者CD8+T细胞体外功能的影响

目的观察IL-24在体外对非小细胞肺癌(non-small cell lung cancer,NSCLC)患者CD8⁺T细胞功能的影响。方法本研究入组28例NSCLC患者和17例健康对照者,收集外周血单个核细胞(peripheral blood mononuclear cells,PBMC)和支气管肺泡灌洗液(bronchoalveolar lavage fluid,BALF),分选CD8⁺T细胞,反转录实时定量PCR检测CD8⁺T细胞中IL-24受体(IL-20R1、IL-20R2和IL-22R1)mRNA的相对表达量。不同浓度重组人IL-24(10 ng/ml和100 ng/ml)刺激纯化CD8⁺T细胞后,流式细胞术检测穿孔素和颗粒酶B的表达变化。建立CD8⁺T细胞和NSCLC细胞系NCI-H1882细胞的直接接触和间接接触体外共培养系统,观察IL-24刺激后CD8⁺T细胞诱导靶细胞死亡比例,以及IFN-γ和TNF-α的表达变化。组间比较采用t检验或LSD-t检验。结果CD8⁺T细胞中未检测到IL-22R1 mRNA表达,CD8⁺T细胞中IL-20R1和IL-20R2 mRNA相对表达量在健康对照者和NSCLC患者之间以及在非肿瘤部位和肿瘤部位之间的差异均无统计学意义(P>0.05)。NSCLC患者外周血和肿瘤部位CD8⁺T细胞中穿孔素和颗粒酶B水平显著低于健康对照者和非肿瘤部位(P<0.05),低浓度IL-24(10 ng/ml)刺激不影响CD8⁺T细胞中穿孔素和颗粒酶B水平(P>0.05),而高浓度IL-24(100 ng/ml)则显著提升NSCLC患者CD8⁺T细胞中穿孔素和颗粒酶B水平(P<0.05)。直接接触共培养系统中,高浓度IL-24(100 ng/ml)刺激NSCLC患者肿瘤部位CD8⁺T细胞后可诱导靶细胞死亡比例升高,以及IFN-γ和TNF-α表达升高,而低浓度IL-24(10 ng/ml)刺激对CD8⁺T细胞诱导的靶细胞死亡和细胞因子分泌无显著影响。间接接触共培养系统中,IL-24刺激对CD8⁺T细胞诱导的靶细胞死亡和细胞因子分泌均无显著影响。结论高浓度IL-24在体外可增强NSCLC患者CD8⁺T细胞的直接细胞杀伤功能,但在体内IL-24可能并不影响CD8⁺T细胞的功能。     

IL-24基因重组腺病毒载体转染的树突状细胞促进宫颈癌CaSki细胞凋亡

 目的：探讨白细胞介素24(interleukin-24,IL-24) 基因重组腺病毒载体转染的树突状细胞(dendri-tic cells,DCs)是否在体外诱导细胞毒性T淋巴细胞(cytotoxic T-lymphocytes,CTLs)对宫颈癌CaSki细胞的杀伤效应。方法：分离培养小鼠未成熟DCs,将已成功构建的带有IL-24基因的重组腺病毒感染体外培养的小鼠未成熟DCs,提取CaSki细胞裂解物负载DCs,制备DC疫苗,Western blotting检测IL-24蛋白的表达;PE-Annexin V和Western blotting检测细胞凋亡及cleaved caspase-3表达;克隆形成实验检测克隆形成能力;裸鼠荷瘤模型体内研究带有IL-24基因的重组腺病毒载体转染DCs在体外诱导的CTLs对宫颈癌CaSki细胞的杀伤效应。结果：Western blotting检测IL-24蛋白高表达;DCs疫苗诱导产生的CTLs后与CaSki细胞共培养,对CaSki细胞生长具有明显的抑制作用, DCs疫苗诱导产生的CTLs促进CaSki细胞凋亡,增加cleaved caspased-3蛋白表达,克隆形成实验检测该疫苗具有抑制CaSki细胞形成克隆的能力。裸鼠的成瘤实验表明,带有IL-24基因的重组腺病毒载体转染DCs可以抑制体内肿瘤的形成,促进肿瘤细胞凋亡。结论：IL-24基因重组腺病毒感染DCs制备的DCs疫苗可诱导CTLs,从而抑制宫颈癌CaSki细胞增殖,并促进其凋亡。     

白细胞介素-18干预诱导的树突状细胞表型和活性研究

目的：研究白细胞介素-18（IL-18）干预诱导的树突状细胞（DC）的表型和活性。方法:自人外周血单核细胞诱导DC，第5 d起分为IL-18组、TNF-α组和IL-18+TNF-α组，分别加IL-18、TNF-α及IL-18+TNF-α促成熟，用ELISA法测定上清中IL-12含量；用流式细胞仪测定培养8 d DC的CD1a、HLA-DR、CD83及CD86的表达；用MTT法检测3组DC诱导T细胞增殖的作用。用ELISA法测定3组DC刺激T细胞分泌干扰素γ(IFN-γ)的量。结果:IL-18组与TNF-α组CD1a、HLA-DR、CD83及CD86表达无差异，IL-18+TNF-α组CD1a、CD83及HLA-DR阳性率高于IL-18组。IL-18+TNF-α组IL-12量高于IL-18组和TNF-α组(P＜0.05)。IL-18组与TNF-α组DC刺激T细胞增殖作用无差异，IL-18+TNF-α组DC的作用强于IL-18组和TNF-α组。IL-18组和TNF-α组IFN-γ量无显著差异，IL-18+TNF-α组IFN-γ的量高于IL-18组和TNF-α组(P＜0.05)。结论:IL-18干预诱导的DC高表达表面分子，具有明显的免疫刺激活性，IL-18与 TNF-α合用作用更强。     

抗CD28单抗和IL-15对CIK增殖和杀肿瘤作用的研究

CIK是肿瘤过继性细胞免疫治疗中的免疫效应细胞。为使CIK在实验室里能被更有效地诱导增殖并赋予其更强的杀肿瘤效应,我们在CIK常规培养环境中加入抗CD28单抗和IL-15,探讨抗CD28单抗和IL-15对CIK增殖和杀肿瘤效应。取人外周血单个核细胞(PBMC),预先以常规方法诱导CIK,然后加入抗CD28单抗和IL-15与CIK共培养。用全自动五分类血液分析仪计数CIK增殖率;用流式细胞术测定CIK中粒酶B、穿孔素和CD107a等分子的表达率;用ELISA方法检测CIK分泌IL-10、IL-12、INF-γ和TNF-α水平;用乳酸脱氢酶释放法测定CIK对人肺癌细胞株(A549)、乳腺腺癌细胞株(MFC-7)和人黑素瘤细胞株(HME1)的杀伤活性。PBMC经常规CIK诱导培养以后再加入抗CD28单抗和IL-15与对照组比较,前者细胞增殖率明显增强(P<0.05);在CIK培养体系中加入抗CD28单抗和IL-15可促进颗粒酶B、穿孔素和CD107a等分子的表达率进一步增强(P<0.05);加入抗CD28单抗和IL-15,培养8d后CIK对A549、MFC-7和HME1细胞杀伤活性分别为82.2%、59.3%和70.6%,与对照组(分别为60.9%、49.6%和48.4%)相比差异有统计学意义(P<0.05);在培养体系中加入抗CD28单抗和IL-15,培养8d后其细胞因子IFN-γ、TNF-α分泌水平显著高于对照组(P<0.05),组间IL-10和IL-12的分泌量未见显著差异(P>0.05)。实验说明在CIK培养体系中加入抗CD28单抗和IL-15可增加CIK增殖率并提高其抗肿瘤效应。     

带有IL-24的腺病毒扩增及其在小鼠树突状细胞中的表达

目的：在293细胞中扩增带有IL-24的腺病毒,感染小鼠树突状细胞,观察IL-24在树突状细胞中的表达。方法：将构建的重组腺病毒表达载体IL-24转染到293细胞中包装、扩增,感染分离培养的小鼠树突状细胞,RT-PCR、Westernblot、荧光显微镜检测IL-24的表达。结果：获得了大量的带有IL-24的腺病毒,成功的感染小鼠树突状细胞,RT-PCR和Westernblot检测结果显示,IL-24在树突状细胞中高表达。结论：带有IL-24的腺病毒可以高效的感染小鼠树突状细胞。     

A gene signature of inhibitory MHC receptors identifies a BDCA3(+) subset of IL-10-induced dendritic cells with reduced allostimulatory capacity in vitro

Dendritic cells (DC) are crucial gatekeepers in regulating immunity. Whereas mature immunostimulatory myeloid DC (DC(ims)) potently promote immune responses, IL-10-induced myeloid DC (DC-IL-10) counteract T cell activation. To elucidate the molecular repertoire by which DC-IL-10 secure reduced T cell activation, comparative gene expression profiling was done using Affymetrix U133A microarrays. Among the genes overexpressed in DC-IL-10, eight immunoreceptor tyrosine-based inhibitory motif (ITIM)-containing inhibitory molecules (ILT2, ILT3, ILT4, ILT5, DCIR, PILRA, FcgammaRIIB, SLAM) were found. Phenotypic analysis of DC-IL-10 defined an ILT(high) DC subset further characterized by expression of CD14, TLR2, DC-SIGN, and CD123 and the lack of lymphocyte, monocyte/macrophage, and plasmacytoid DC markers such as CD3, CD8, and CD68. A unique feature of the ILT(high) DC subset was expression of the novel DC marker BDCA3, which was not detected on monocytes, immature DC, DC(ims), or ILT(low) DC-IL-10. While the allogeneic T cell proliferation induced by the entire DC-IL-10 population was approximately 30% of that stimulated by DC(ims), allogeneic MLR responses driven by the ILT(high) DC subset were reduced to 8% of the allostimulatory capacity of DC(ims), although secretion of the inhibitory cytokine IL-10 and other Th1/Th2-associated cytokines was similar in these cells.     

Synergy in induction of increased renal allograft survival after portal vein infusion of dendritic cells transduced to express TGFbeta and IL-10, along with administration of CHO cells expressing the regulatory molecule OX-2

Dendritic cells (DC), generated from C57BL/6 mouse bone marrow cells cultured with GM-CSF and IL-4 for 9 days, were engineered to express constitutively the cytokines TGFbeta, IL-10, and IL-12, using adenovirus vectors constructed using an E1-deleted replication-deficient recombinant adenovirus carrying the appropriate cDNA for the relevant cytokines (Ad-TGFbeta, Ad-IL-12, or Ad-IL-10). C3H mice receiving nontransduced DC or pretransplant infusion of DC-Ad-LacZ showed increased survival of C57BL/6 renal grafts relative to that of control nonimmunized mice. Transfusion of Ad-IL-12-transduced DC abolished this increased survival, leading to a graft survival equivalent to that of controls with no DC. Optimal graft survival was seen in the group receiving a mixture of DC transduced with constructs for both IL-10 and TGFbeta. There was a correlation between increased graft survival and both inhibition of the induction of CTL and enhancement of a polarization to produce type-2 cytokines (IL-4, IL-10, and TGFbeta) on antigen-specific restimulation in vitro. These effects were more pronounced following concomitant infusion of CHO cells transfected with a full-length cDNA for murine OX-2.     

Interactions of dendritic cells with cancer cells and modulation of surface molecules affect functional properties of CD8+ T cells

To understand the interaction of dendritic cells (DCs) with cancer cells, we investigated molecular changes in DCs following co-culture with cancer cells. DCs co-cultured with Jurkat cancer cells showed remarkable down-regulation of MHC class I molecules, while DCs co-cultured with MCF-7 cancer cells showed minimal changes. Interestingly, down-regulation of MHC class I on DCs was not observed upon treatment with Jurkat cell lysate or culture supernatant, suggesting the importance of direct cell-cell interactions. The expressions of CD40, CD80, CD83, MHC class II, and IL-12p40 on DCs co-cultured with Jurkat cells were only slightly affected. In contrast, DCs co-cultured with MCF-7 cells showed increased expressions of CD80, CD83, CD86, and IL-12p40. Furthermore, DCs co-cultured with Jurkat cells showed a down-regulation of low molecular weight polypeptides (LMP) 7, and of transporter associated with antigen processing (TAP) 1 and 2 at the mRNA expression level. LMP7, TAP2 and β2-microglobulin (β2M) were also down-regulated at the protein level. We further demonstrated how altered expression of MHC class I on DCs caused by co-culture with cancer cells affected autologous CD8(+) T cells, using the model MHC class I-presented HSV antigen. We found that DCs that had been HSV-treated and co-cultured with Jurkat cells showed a reduced potency to activate CD8(+) T cells. In contrast, HSV-treated DCs that had been co-cultured with MCF-7 cells induced activation of CD8(+) T cells, including high expression of CD25, CD69, granzyme B and cytokines, TNF-α and IFN-γ.     

B-cell exposure to self-antigen induces IL-10 producing B cells as well as IL-6- and TNF-α-producing B-cell subsets in healthy humans

Human B cells are able to secrete IL-10 after stimulation with mitogens, but their ability to produce IL-10 and regulate T-cell responses after stimulation with self-antigens is unclear. We co-cultured thyroglobulin-pulsed B cells from healthy donors with autologous T cells and observed production of IL-10 and TGF-β, in addition to TNF-α and IL-6. Pulsing with foreign antigen, tetanus toxoid (TT), induced a Th1-response with minimal IL-10 production. After thyroglobulin-pulsing, 1.10±0.50% of B cells and 1.00±0.20% of CD4(+) T cells produced IL-10, compared to 0.29±0.19% of B cells (P=0.01) and 0.13±0.15% of CD4(+) T cells (P=0.006) following TT-pulsing. Thyroglobulin-stimulated, IL-10-secreting B cells were enriched within CD5(+) and CD24(high) cells. While thyroglobulin-pulsed B cells induced only modest proliferation of CD4(+) T cells, B cells pulsed with TT induced vigorous proliferation. Thus, B cells mediate self-antigen-specific IL-10, TNF-α and IL-6 production in co-cultures with T cells and contribute actively to these cytokine secretions.     

腺病毒载体介导的人IL-24基因对HL-60白血病细胞体外培养的影响

目的 构建人IL-24的腺病毒载体Ad-IL24,观察Ad-IL24对HL-60细胞体外培养的影响.方法 以pcDNA3.0-IL24重组质粒为模板PCR扩增IL-24基因,酶切并连接到带有绿色荧光蛋白(GFP)标记的pAdTrack-CMV质粒上,Pme Ⅰ线性化重组质粒pAdTrack-CMV-IL24,并与腺病毒质粒pAdEasy-1共转化BJ5183细菌,获得重组腺病毒载体pAdEasy-1-pTrack-CMV-IL24,经Pac Ⅰ线性化后转染QBI-293A细胞,收获重组病毒Ad-IL24.将它感染HL-60细胞,通过激光扫描共聚焦显微镜(LSCM)、MTT和流式细胞术(FCM)法检测IL-24对HL-60细胞生长的影响,免疫细胞化学分析凋亡因子的改变,ELISA检测重组病毒对HL-60细胞分泌γ干扰素(IFN-γ)和肿瘤坏死因子-α(TNF-α)的影响.结果 成功构建重组腺病毒载体pAdEasy-1-pTrack-CMV-IL24并获得高滴度的重组腺病毒Ad-IL24,各种检测方法表明IL-24基因能抑制HL-60细胞生长,诱导凋亡,IL-24还能下调HL-60细胞Bcl-2的表达并刺激它分泌二级细胞因子IFN-γ和TNF-α.结论 IL-24能抑制HL-60细胞生长、诱导凋亡,它可通过下调HL-60细胞Bcl-2的表达并刺激其分泌具有抗肿瘤活性的二级细胞因子来发挥效应.