IL-13抑制人肾小球系膜细胞IL-12的表达

为了探讨白细胞介素 13(IL 13)对体外培养的人肾小球系膜细胞产生白细胞介素 12 (IL 12 )的影响。我们用脂多糖(LPS 10 μg/ml) ,不同浓度的IL 13对系膜细胞培养 ,分别采用ELISA法和半定量RT PCR法检测细胞上清液的IL 12和系膜细胞IL 12p4 0mRNA表达。结果提示 5 %NCSRPMI 16 4 0基础培养条件下的系膜细胞未检测到IL 12蛋白分泌及其mRNA表达。在LPS刺激下系膜细胞的IL 12p4 0mRNA表达加强 ,并分泌出大量的IL 12。IL 13在 1～ 10 0ng/ml浓度范围内对LPS诱导的系膜细胞IL 12分泌及IL 12p4 0mRNA表达的抑制作用呈剂量依赖趋势。本研究认为IL 13可能通过抑制IL 12的产生 ,而调整了体内Th1/Th2细胞因子平衡 ,作为抗炎性细胞因子在肾小球肾炎发病机制中发挥一定作用     

白细胞介素-13对肾小球系膜细胞炎症反应的拮抗作用

目的:探讨白细胞介素-13(IL-13)对肾小球系膜细胞(MC)炎症反应的调节作用。方法:ELISA法测定体外培养MC上清中TNF-α浓度。流式细胞术检测MC膜表面ICAM-1表达。逆转录聚合酶链式反应(RT-PCR)评估MCTNF-αmRNA及ICAM-1mRNA表达。结果:未受刺激的MC无TNF-αmRNA及其蛋白表达。经脂多糖(LPS)(10mg/L)刺激后,MC可高表达TNF-αmRNA及其蛋白。IL-13浓度为1μg/L、10μg/L时显著抑制LPS诱导MC表达TNF-αmRNA及其蛋白。IL-13(0.1μg/L)无抑制作用,IL-13(100μg/L)时完全抑制LPS诱导MC分泌TNF-α。无任何刺激时,MC低表达ICAM-1。TNF-α(100μg/L)诱导MC高表达ICAM-1mRNA及其蛋白。IL-13(10μg/L)和TNF-α(100μg/L)共作用MC,各时点均显示IL-13对TNF-α诱导MC表达ICAM-1mRNA及蛋白有抑制作用。结论:IL-13既抑制LPS刺激MC分泌TNF-α,也抑制TNF-α诱导MC表达膜糖蛋白ICAM-1。提示IL-13能从多个环节抑制MC的炎症反应。     

白细胞介素13

IL-13是新近发现的一种新的细胞因子。由Th2细胞产生。人IL-13(hIL-13)的分子量为17kD(糖基化)和12.4kD(非糖基化);鼠IL-13(mIL-13)的分子量为14k ;二者的氨基酸序列同源性为58％。hIL-13和mIL-13的基因定位于人第5号染色体和鼠第11号染色体上,并与IL-4基因紧密连锁,二者的cDNA同源性为66%。重组IL-13(γIL-13)具有多种生物学活性包括刺激前髓样细胞增殖;诱导单核细胞表达MHCⅡ类抗原和CD23,促进B细胞增殖、分化和分泌Ig,抑制炎症因子的产生和HIV-1的复制,抗肿瘤等。对其深入研究将有助于认识IL-13在炎症反应的发生和发展以及调节免疫应答方面的作用,并为其临床应用的可能性提供理论依据。     

白细胞介素10基因转移抑制肾小球系膜细胞诱生炎症细胞因子

目的：通过建立白细胞介素１０（ＩＬ－１０）的重组逆转录病毒载体基因转移系统,观察ＩＬ－１０对脂多糖（ＬＰＳ）诱导的大鼠肾小球系膜细胞（ｇｌｏｍｅｒｕｌａｒｍｅｓｅｎｇｉａｌｃｅｌ,ＧＭＣ）中细胞因子的产生及其基因表达的影响。方法：通过构建的重组逆转录病毒载体ｐＬＸ（ＩＬ－１０）ＳＮ将外源基因ＩＬ－１０转移至大鼠ＧＭＣ：（１）应用聚合酶链反应（ＰＣＲ）,反转录聚合酶链反应（ＲＴ－ＰＣＲ）和ＥＬＩＳＡ检测ＩＬ－１０基因的整合和表达;（２）以ＲＴ－ＰＣＲ观察ＩＬ－１０基因转移对ＬＰＳ诱导的ＧＭＣ肿瘤坏死因子－α（ＴＮＦ－α）的ｍＲＮＡ表达的影响,以ＥＬＩＳＡ测定白细胞介素－１β（ＩＬ－１β）和ＴＮＦ－α的蛋白质表达。结果：外源性ＩＬ－１０基因已整合到靶细胞染色体ＤＮＡ并有效地表达,它能抑制ＬＰＳ诱生ＧＭＣ过度产生ＩＬ－１β,ＴＮＦ－α。结论：外源性ＩＬ－１０基因可以转移到ＧＭＣ并稳定表达,它能抑制ＧＭＣ炎症效应中细胞因子的产生及其基因表达。     

白细胞介素6对肾小球上皮细胞合成硫化合物的影响

白细胞介素６对肾小球上皮细胞合成硫化合物的影响王丹，杨霁云，王宝琳（北京医科大学第一附属医院儿科北京１０００３４）白细胞介素６（ＩＬ－６）是机体免疫系统中重要的调节因子，参与了机体炎症过程。肾小球疾病时，可见血清ＩＬ－６水平改变。肾小球上皮细胞（ＧＥ...     

白细胞介素13

白细胞介素１３是最近发现的由Ｔｈ２细胞产生的细胞因子。其对Ｂ细胞调节作用与白细胞介素４相似，另外它也具有Ｔｈ１细胞的功能，是一种多功能活性的细胞因子。本文对其生物学功能和分子生物学性质作一简单介绍。     

重组白细胞介素1对系膜细胞产生与表达白细胞介素6的影响

采用ＩＬ－６依赖型细胞株ＫＤ８与Ｎｏｒｔｈｅｍｂｌｏｔ方法观察了重组ＩＬ－１对人胎肾小球系膜细胞产生与表达ＩＬ－６ｍＲＮＡ的影响，结果表明，重组ＩＬ－１加入系膜细胞培养体系中，ＩＬ－６活性与ｍＲＮＡ表达均明显高于对照组，提示重组ＩＬ－１可促进系膜细胞产生与表达ＩＬ－６。     

重组白细胞介素13促进成纤维细胞增殖及胶原合成

目的：观察重组白细胞介素13（rIL-13）对3T3细胞的作用，探讨肺纤维化的发生机制。 方法： 3T3细胞分为实验组和对照组，分别加入rIL-13 (80 μg/L)及DMEM培养液, 作用24 h、48 h，利用透射电镜观察成纤维细胞的超微结构，用Hoechst 试剂盒观察细胞DNA形态；用MTT法测细胞增殖率，用Western blotting检测成纤维细胞分泌Ⅰ型胶原以及用放免法检测细胞上清中IL-6、IL-8水平。 结果： 实验组细胞DNA合成增加，细胞核增大，细胞质中可见较多核糖体及线粒体；rIL-13呈剂量依赖方式刺激成纤维细胞增殖，当rIL-13浓度在40-160 μg/L时，细胞增殖率几乎呈直线式增长。对照组及实验组均可检测到Ⅰ型胶原（CoⅠ），对照组分泌胶原的量显著高于对照组（P<0.01）。细胞培养上清中，实验组IL-6、IL-8含量显著高于对照组（P<0.01）。 结论： rIL-13通过促进成纤维细胞增殖及分泌炎性介质和Ⅰ型胶原，可能在肺纤维化的发病机制中发挥关键作用。     

白细胞介素13

白细胞介素１３是１９９３年新命名的一种细胞因子。目前一般认为它属于机体免疫应答中的ＴＨ２型因子，ＩＬ－１３的基因和蛋白质分子结构已经探明，它对前骨髓细胞、单核巨噬细胞、Ｂ淋巴细胞、大颗粒淋巴细胞等多种免疫细胞发挥作用。ＩＬ－１３在机体免疫调节中的生理病理作用还有待于深入探讨。     

IL-13对LPS诱导人系膜细胞分泌IL-12的影响

目的: 探讨白细胞介素13（IL-13）对肾小球系膜细胞分泌白细胞介素12（IL-12）的影响作用。方法: 用酶联免疫吸附（ELISA）法和逆转录聚合酶链反应（RT-PCR）法检测系膜细胞IL-12蛋白和L-12p40 mRNA表达。结果: LPS诱导系膜细胞的IL-12p40 mRNA表达及其蛋白分泌（P<0.01）。IL-13在1-100 μg/L浓度范围内呈剂量依赖性抑制LPS诱导的系膜细胞IL-12分泌及其mRNA表达（P<0.05或P<0.01）。结论: IL-13可能通过抑制LPS诱导系膜细胞分泌IL-12，而调整了体内Th1/Th2细胞因子平衡。     

Major role of the soluble interleukin-6/interleukin-6 receptor complex for the proliferation of interleukin-6-dependent human myeloma cell lines

Interleukin-6 (IL-6) is a proinflammatory cytokine which possesses a central growth factor activity for certain tumor cells such as plasma cells in multiple myeloma (MM). Upon binding of IL-6, soluble IL-6 receptor (sIL-6R) has been shown to retain its affinity for IL-6 and to associate with the signal-transducing gp130 chain. Therefore, contrary to the majority of soluble cytokine receptors, it plays an agonist role in IL-6 signaling. In order to test its physiological importance as compared to that of its membrane counterpart, we studied cells from two myeloma cell lines which need exogenous IL-6 to proliferate and release sIL-6R into their culture supernatant. Using a new culture system where the supernatant recirculated permanently through an anti-IL-6R affinity column, all sIL-6R was removed from the culture medium throughout the culture period. Under these conditions IL-6-dependent cells were unable to grow in the presence of physiological concentrations of IL-6, showing the major role of the sIL-6R for sustaining the proliferation of these cell lines. Increasing IL-6 concentrations well over the physiological values allowed the cells to proliferate again. No effect was seen when sIL-6R was removed from the supernatant of an IL-6-independent myeloma cell line. These results show that the levels of circulating sIL-6R (and thus those of IL-6/sIL-6R complex) are worth looking at in pathologies involving IL-6 hyperactivity.     

Biological activity of recombinant murine interleukin-6 in interleukin-1 T cell assays

Interleukin-6 (also called B cell stimulatory factor 2, hepatocyte activating factor, interferon-β₂) has been shown to have effects on various lineages of hemopoietic cells. Some of its activities appear to overlap those of interleukin-1. In particular, recombinant murine IL-6 induced proliferation of phytohemagglutinin-activated thymocytes, an assay widely used to detect IL-1. In this report, we compared several features of IL-1 and IL-6 dependent thymocyte proliferation. The results indicate that IL-2 is the major second mediator of both IL-1 and IL-6 dependent proliferation. Finally, we tested whether IL-6 would also have activity in other T cell-based IL-1 assays using the T cell lymphoma LBRM33 1A5 and the T cell clone D10-G4.1. IL-6 had no activity in the latter two assays. These results indicate that IL-1 assays using LBRM33 1A5 and D10-G4.1 selectively detect Il-1, and are more specific assays for the detection of IL-1 in samples that may also contain IL-6.     

The clinical role of interleukin-6 and interleukin-6 soluble receptor in human follicular fluids

In order to investigate the role of interleukin-6 (IL-6) and interleukin-6 soluble receptor (sR) in human ovulation, we evaluated the concentrations in human follicular fluid and analyzed the correlation of IL-6 and IL-6 sR with oocyte maturation. The oocytes were obtained from the follicular fluid of 45 women undergoing in vitro fertilization and embryo transfer. The concentrations of IL-6 and IL-6 sR in follicular fluid were measured by ELISA. In addition, granulosa cells obtained from the follicular fluid were cultured and treated with forskolin and 12-o-tetradecanoylphorbol 13-acetate for 24–48 h. The concentration of IL-6 was significantly higher in the follicular fluid than in the serum (P<0.01). In contrast, the concentration of IL-6 sR was significantly lower in the follicular fluid than in the serum (P<0.001). The concentrations of IL-6 and IL-6 sR were significantly higher in the follicular fluid containing mature oocytes than in fluid containing immature oocytes (P<0.05). The production of IL-6 was markedly increased over the basal level after 24 h of treatment with forskolin(P<0.001) and 48 h of treatment (P<0.01) with cultured granulosa cells. Our data suggest that IL-6 and IL-6 sR may play an important role in follicular growth and development in human preovulatory processes. It is possible that IL-6 in particular may be regulated by cAMP. IL-6 and IL-6 sR might also be valuable biochemical markers in the evaluation of oocyte maturation. Received: 6 July 2002 / Accepted: 18 December 2002 Correspondence to Y. Kawano     

麻疹疫苗反复注射对哮喘患儿IL-12、IL-13水平的影响

目的与方法:通过观察轻-中度发作期哮喘患儿麻疹疫苗反复注射前后IL-12,IL-13及血清总IgE水平的变化,探讨麻苗治疗对哮喘患儿的免疫影响及其治疗小儿哮喘的作用机制。采用生物素-亲合素双抗夹心酶联免疫(ABC-ELISA)法测定麻苗治疗前后13例哮喘患儿(麻苗治疗组)血浆及外周血单个核细胞(PBMC)培养上清中的IL-12、IL-13与血清总IgE水平,并与12例单纯对症治疗组哮喘患儿及17例正常对照组小儿比较。结果:麻苗治疗后,IL-12水平与对症治疗组无显著差异(P＞0.05),IL-13与血清总IgE水平显著降低(P＜0.05)。血浆IL-12水平与血清总IgE水平呈负相关(r=-0.437,P＜0.05),PBMC培养上清中的IL-12水平与血清总IgE水平无相关性;血浆及PBMC培养上清中的IL-13水平与血清总IgE水平呈正相关(r=0.657及r=0.485,P＜0.01);血浆及PBMC培养上清中的IL-12水平与IL-13水平呈负相关(r=-0.460及r=-0.383,P＜0.05)。结论:麻疹疫苗反复注射是通过下调哮喘患儿IL-13水平,进而降低血清总IgE水平,而对IL-12水平无显著影响。