IL-5反义寡核苷酸对哮喘大鼠CD4+ T淋巴细胞IL-5 mRNA和蛋白质表达的影响

IL-5是哮喘中的重要调节因子。因此，阻断IL-5的合成对治疗哮喘有着积极的作用。国外研究表明，反义寡核苷酸技术可以较好地在转录水平阻断IL-5的表达。而且，大部分IL-5 mRNA及IL-5由CD4^ T淋巴细胞表达。由于反义寡核苷酸作用mRNA不同部位，其阻断效果可能不同。因此，我们设计了IL-5 mRNA上起始密码处、外显子-2和终止密码处的反义寡核苷酸，利用脂质体导入哮喘大鼠CD4^ T淋巴细胞，观察比较反义寡核苷酸组与空白对照组、反义寡核苷酸各组间对IL-5mRNA及蛋白质的抑制效率。     

反义c-myc寡核苷酸抑制大鼠胸腺淋巴细胞增殖

目的:观察反义c-myc寡核苷酸对大鼠胸腺淋巴细胞增殖的抑制作用。方法:Ficoll密度梯度离心法分离大鼠胸腺淋巴细胞。利用Iipofectin将正义、反义及错配c-myc寡核苷酸导入大鼠胸腺淋巴细胞,-TdR掺入法及MTS法检测淋巴细胞增殖,RT-PCR检测c-mycmRNA的表达。结果:反义c-myc寡核苷酸可抑制大鼠胸腺淋巴细胞的增殖,但此抑制作用无浓度依赖性,反义c-myc寡核苷酸可降低胸腺淋巴细胞c-mycmRNA的表达。结论:反义c-myc寡核苷酸可抑制大鼠胸腺淋巴细胞的增殖。     

抗HBV最佳反义寡核苷酸片段的体外筛选

目的 寻找抗ＨＢＶ最佳反义寡核苷酸区段。方法 合成４种互补于ＨＢＶ不同区段的反义硫代寡核酸（ａｓＯＮ）,加入ＨＢＶ基因转染的肝癌细胞模型ＨｅｐＧ２２．２．１５,以ＥＬＳＡ法测定ＨＢｓＡｇ、ＨＢｅＡｇ含量。结果 互补于ｐｒｅ－Ｓ２翻译起始区的ａｓＯＮ（序列Ⅰ）抗ＨＢＶ基因表达作用最强（Ｐ〈０．０２）,对ＨＢｓＡｇ、ＨＢｅＡｇ的最高表达抑制率分别为６６％和９１％,针对增强Ⅱ（ＥＮⅡ）的序列Ⅲ也有较强的     

CT120反义寡核苷酸抑制肺腺癌细胞A549的生长

目的 探讨CT120基因与肺腺癌细胞A549生长、分化的关系。方法 构建含有CT120基因的反义表达载体（命名为pcDNA3.1-CT120）,并将该载体转染肺腺癌细胞A549,应用G418筛选,获得了稳定表达CT120反义基因的克隆（命名为pcDNA3.1-CT120-A549）。RT-PCR和Western blot 检测CT120表达。流式细胞仪和软琼脂集落形成实验分析细胞生长,同时用RT-PCR检测P53、CYCLIND1 和CDK4的表达。结果 成功构建了含有CT120基因的反义表达载体,而且该载体能够有效抑制CT120在肺腺癌细胞A549中的表达。抑制CT120基因的表达能够抑制细胞的生长,促进细胞凋亡。在稳定表达CT120反义基因的克隆中P53表达明显上调,CYCLIND1 和CDK4表达明显下调。结论 反义寡核苷酸抑制CT120的表达有可能是肺癌基因治疗的一个新的靶点。     

反义寡核苷酸在动脉粥样硬化研究中的应用

反义寡核苷酸在动脉粥样硬化研究中的应用成凤羚（中国医学科学院基础医学研究所，北京１００００５）Ａｂｓｔｒａｃｔ：Ａｂｒｅｉｆｒｅｖｉｅｗｏｆａｎｔｉｓｅｎｓｅｏｌｉｇｏｄｅｏｘｙｎｕｃｌｏｔｉｄｅｓｕｓｅｄａｓａｔｈｅｒａｐｅｕｔｉｃａｇｅｎｔｏｎｃ...     

LMP-1 mRNA反义寡核苷酸抑制大鼠成骨细胞的分化

为深入探讨LIM矿化蛋白1（LMP－1）在成骨细胞分化中的作用，体外培养大鼠成骨细胞，在培养基中加入LMP－1反义寡核苷酸（LMP－1antisense终浓度为0．8mol／L），以阻断大鼠成骨细胞中LMP－1mRNA的表达。对照组加nonsense（终浓度为0．8mol／L）。测定细胞的碱性磷酸酶（ALP）活性、培养基中骨钙素（OC）的含量，免疫组化分析Ⅰ型胶原蛋白的表达，Northern blotting检测I型胶原mRAN的表达。结果显示：LMP－1mRNA被LMP－lantisense阻断后，ALP活性降低、OC分泌减少、I型胶原蛋白和mRNA的表达下降。上述结果表明：LMP－1mRNA被LMP－1反义寡核酸阻断后，成骨细胞分化受到明显的抑制，提示LMP－1是成骨细胞分化必不可少的正调节因子。     

反义寡核苷酸抑制神经母细胞瘤LA-N-5细胞血管内皮生长因子mRNA表达及其生物效应的研究

目的研究血管内皮生长因子(VEGF)反义寡核苷酸(ASODN)转染对神经母细胞瘤LA-N-5细胞VEGF mRNA表达的影响以及对肿瘤细胞增殖、分化的影响。方法用LipofectamineTM2000介导的VEGF ASODN和错义寡核苷酸(MSODN)转染LA-N-5细胞,半定量RT-PCR检测各组细胞VEGF165和VEGF121 mRNA转染前后不同时间表达的变化;MTT法测定转染后各组细胞的生长曲线及抑制率。结果半定量RT-PCR检测结果显示,在转染后72 h VEGF165和VEGF121 mRNA的表达:ASODN组为0.346±0.029和0.227±0.036,ASODN+LipofectamineTM2000组为0.275±0.035和0.165±0.017。ASODN组和ASODN+LipofectamineTM2000组均显著抑制VEGF mRNA的表达,ASODN+LipofectamineTM2000组抑制作用较ASODN组更强(P<0.05);转染后ASODN组和ASODN+LipofectamineTM2000组细胞增殖显著受抑,在48 h时抑制率最高,分别为(39.92±2.7...     

反义寡核苷酸抑制猪内皮细胞生成内皮素的研究

目的：研究内皮素反义寡核苷酸能否抑制猪肺动脉内皮细胞生成内皮素。方法：设计并合成三段针对内皮素－１前体基因的反义寡核苷酸片段，检测其对培养的内皮细胞生成内皮素的影响。结果：两个反义寡核酸片段能明显抑制体外内皮细胞生成内皮素，而相应正义和非特异硫代寡核苷酸则无此抑制作用，说明其作用具特异性。结论：内皮素－１反义寡核苷酸有可能用于内皮素相关的疾病的治疗。     

反义myb寡核苷酸对内皮素诱导动脉平滑肌细胞增殖抑制…

合成反义在正义ｃ－ｍｙｂ１８ｍｅｒ，分别导入培养的ＷＫＹ主动脉平滑肌细胞（ＳＭＣｓ），同时用内皮素诱导ＳＭＣｓ增殖。反义ｃ－ｍｙｂ寡核苷酸（ＯＤＮｓ）对内皮素诱导ＳＭＣｓ的抗细胞增殖抑制作用随浓度（６０μｍｏｌ．Ｌ＾－１－１２０μｍｏｌ．Ｌ＾－１）的增加而增加。用１２０μｍｏｌ．Ｌ＾－１反义ＯＤＮ抗细胞增殖能力随时间延长而下降。免疫组化显示受掏细胞ｍｙｂ水平较同期对照组或正义ＯＤＮ组低。以上为反     

The initial response of CD4+ IL-4-producing cells

Naive CD4(+) T cells were reported to produce small amounts of IL-4 in vitro, which are implicated to be sufficient to initiate T(h)2 response in vivo. However, IL-4-producing naive CD4(+) T cells are difficult to study in vivo because they are present in low numbers shortly after the first antigen exposure. Here, we used IL-4/green fluorescence protein (GFP) reporter mice (G4 mice) to track the initial response of CD4(+) IL-4-producing cells. We first established a flow cytometry method to estimate the number of GFP(+) cells. We demonstrated the effectiveness of this method by showing that the responding CD4(+)GFP(+) cells exhibited an activated phenotype, possessed the capacity to express IL-5 and IL-13, but not IFN-gamma mRNA, and showed enhanced levels of GATA3 and c-maf mRNA expression. More importantly, we showed that the cell lines derived from FACS-sorted CD4(+)GFP(+) cells were antigen specific. By using this newly established method, we showed that the majority of responding GFP(+) cells were CD4(+) T cells. Our study provides direct ex vivo evidence to show that a small percent of CD4(+) T cells that have no previous experience of antigenic stimulation might produce IL-4 to initiate T(h)2 response.     

CD4+CD25+T细胞在系统性红斑狼疮中的表达及意义

目的：探讨CD4^＋ CD25^＋ T细胞、IL-10在系统性红斑狼疮（SLE）患者外周血的表达及临床意义。方法：入组30例SLE患者和20例正常对照者，其中活动性SLE患者17人，非活动性SLE患者13人。用流式细胞仪检测SLE患者和正常对照者的外周血CD4^＋ CD25^＋ T细胞阳性率，用酶联免疫吸附试验（ELISA）检测血清中IL-10浓度。结果：活动性和非活动性SLE患者CD4^＋ T细胞总数均低于正常对照者；活动性和非活动性SLE患者CD4^＋ CD25^＋ T细胞阳性率高于正常对照者；活动性SLE患者IL-10浓度显著高于非活动性SLE患者和正常对照者。SLE患者CD4^＋ CD25^＋ T细胞阳性率和血清IL-10浓度与补体C3、抗DNA抗体水平及SLEDAI积分均无相关性。结论：SLE患者外周血CD4^＋ CD25^＋ T细胞是活化T细胞的标志，IL-10分泌异常与SLE的发病有关。     

人外周血CD4~+ IL-21~+记忆T细胞的特征

目的:探讨人外周血中白细胞介素21(IL-21)的产生细胞及其特征。方法:分离人外周血单个核细胞(PBMC),分为不刺激或anti-CD3(OKT3)、OKT3+anti-CD28、PMA+ionomycin刺激四个组,流式细胞术(FCM)检测产生IL-21的细胞亚群。PMA+ionomycin刺激PBMC、纯化CD4+、CD4+CD45RA-、CD4+CD45RA+细胞、脐带血单个核细胞(CB-MC),FCM分析产生IL-21细胞的表型特征和IL-21与Th1、Th2、Th17和Th22细胞因子之间的关系。结果:与OKT3、OKT3+anti-CD28相比,PMA+ionomycin能诱导最高量的IL-21产生。产生IL-21的主要细胞为CD4+T细胞,少数CD8+T细胞。CD4+IL-21+T细胞表达CD45RO,不表达CD45RA,其中部分细胞表达CCR6、CCR7或CXCR5。CD4+CD45RA-细胞表达IL-21远高于CD4+CD45RA+细胞。进一步研究表明,PBMC产生IL-21,而CBMC不产生。此外,大约24%的CD4+IL-21+细胞表达IFN-γ,小于10%CD4+IL-21+细胞表达IL-4、IL-17或IL-22。结论:人PBMC在多克隆刺激的条件下,可以诱导IL-21的产生。产生IL-21的主要细胞亚群具有记忆CD4+T细胞的表型。其中一部分CD4+IL-21+T细胞的表型独立于Th1、Th2、Th17和Th22细胞亚群。     

Antigen-specific CD8+ T cells inhibit IgE responses and interleukin-4 production by CD4+ T cells

There is a growing body of evidence which suggests that CD8⁺ T cells play an important part in regulating the IgE response to non-replicating antigens. In this study we have systematically investigated their role in the regulation of IgE and of CD4⁺ T cell responses to ovalbumin (OVA) by CD8⁺ T cell depletion in vivo. Following intraperitoneal immunization with alum-precipitated OVA, OVA-specific T cell responses were detected in the spleen and depletion of CD8⁺ T cells in vitro significantly enhanced the proliferative response to OVA. Depletion of CD8⁺ T cells in vivo 7 days after immunization failed to enhance IgE production, while depletion of CD8⁺ T cells on days 12–18 greatly enhanced the IgE response, which rose to 26 μ/ml following a second injection of anti-CD8 on day 35 and remained in excess of 1 μ/ml over 300 days afterwards. Reconstitution on day 21 of rats CD8-depleted on day 12 with purified CD8⁺ T cells from animals immunized on day 12 completely inhib ited the IgE response. This effect was antigen specific; CD8⁺ T cells from OVA-primed animals had little effect on the IgE response of bovine serum albumin immunized rats. In vivo, CD8⁺ T cell depletion decreased interferon (IFN)-γ production but enhanced interleukin (IL)-4 production by OVA-stimulated splenic CD4⁺ T cells. Furthermore, CD8⁺ T cell depletion and addition of anti-IFN-γ antibody enhanced IgE production in vitro in an IL-4-supplemented mixed lymphocyte reaction. These data clearly show that antigen-specific CD8⁺ T cells inhibit IgE in the immune response to non-replicating antigens. The data indicate two possible mechanisms: first, CD8⁺ T cells have direct inhibitory effects on switching to IgE in B cells and second, they inhibit OVA-specific IL-4 production but enhance IFN-γ production by CD4⁺ T cells.     

CD25+ CD4+ T cells compete with naive CD4+ T cells for IL-2 and exploit it for the induction of IL-10 production

Maintenance of homeostasis in the immune system involves competition for resources between T lymphocytes, which avoids the development of immune pathology seen in lymphopenic mice. CD25+ CD4+ T cells are important for homeostasis, but there is as yet no consensus on their mechanisms of action. Although CD25+ CD4+ T cells cause substantial down-regulation of IL-2 mRNA in responder T cells in an in vitro co-culture system, the presence of IL-protein can be demonstrated by intracellular staining. As a consequence of competition for IL-2, CD25+ CD4+ T cells further up-regulate the IL-2R alpha chain (CD25), a process that is strictly dependent on IL-2, whereas responder T cells fail to up-regulate CD25. Similarly, adoptive transfer into lymphopenic mice showed that CD25+ CD4+ T cells interfere with CD25 up-regulation on co-transferred naive T cells, while increasing their own CD25 levels. IL-2 sequestration by CD25+ CD4+ T cells is not a passive phenomenon but instead initiates--in conjunction with signals through the TCR--their differentiation to IL-10 production. Although IL-10 is not required for in vitro suppression, it is vital for the in vivo function of regulatory T cells. Our data provide a link explaining the apparent difference in regulatory mechanisms in vitro and in vivo.     

IL-27诱导原发性胆汁性肝硬化患者CD4+T细胞增殖分化作用机制研究

目的 探讨IL-27对原发性胆汁性肝硬化(primary biliary cirrhosis,PBC)患者外周血CD4+T细胞的增殖分化作用及其相关免疫学机制.方法 收集PBC患者、慢性乙肝患者(choronic hepatitis B,CHB)、健康体检者(health controls,HCs)外周血,磁珠分离CD4+T细胞.IL-27体外作用后,CCK-8测定细胞增殖情况,ELISA法检测细胞因子,定量PCR分析T-bet和GATA3基因表达情况,免疫印迹测定p-STAT-1和p-STAT-3的表达.结果 IL-27作用后,PBC组、CHB组和HCs组CD4+T细胞增殖能力均显著增强,PBC组CD4+T细胞增殖能力强于CHB和HCs组,差异有统计学意义(P＜0.001),同时PBC组细胞培养液中IL-2和IFN-γ在IL-27作用后较CHB和正常对照组均显著增高(P＜0.001),IL-10表达无明显变化.未经IL-27诱导情况下,PBC组T-bet表达高于CHB组(P=0.007),IL-27诱导后PBC组CD4+T淋巴细胞T-bet基因表达显著增加,同时对GATA3具有抑制作用,作用前后差异有统计学意义(P＜0.001),CHB组作用前后无显著变化(P=0.3).免疫印迹测定p-STAT-1、p-STAT-3发现,正常情况下各研究组均不表达p-STAT-1、p-STAT-3,IL-27作用后,表达明显升高,其中PBC组升高尤为明显.结论 IL-27可以诱导PBC患者CD4+T细胞增殖,并通过活化p-STAT-1、p-STAT-3信号通路,诱导CD4+T细胞向Th1分化,同时分泌相关细胞因子,可能在PBC早期免疫炎症反应过程中具有重要作用.     

IL-4 synthesis byin vivo-primed memory CD4+ T Cells: II. Presence of IL-4 is not required for IL-4 synthesis in primed CD4+ T Cells

Previous studies have shown that the presence of IL-4 is required for the development of IL-4 synthesis in naive CD4⁺ T cells. The purpose of our current studies was to investigate the role of IL-4 in the development of IL-4 synthesis in primed memory T cells. We therefore examined CD4⁺ T cells taken from lymph nodes of BALB/c mice immunized with keyhole limpet hemocyanin (KLH) and restimulatedin vitro with KLH. Our results with such primed resting CD4⁺ T cells programmed to produce IL-4 indicated that the production of IL-4 did not require the presence of IL-4 (although the presence of IL-2 was absolutely necessary), and was only slightly limited by the presence of anti-IL-4 MAb. These results with resting memory T cells were not biased by the presence of activated T cells already producing substantial quantities of IL-4, since we demonstrated that high-density memory T cells could produce IL-4 in the absence of IL-4, and because T cells that actively produce IL-4 do not persistin vivo very long after antigen exposure. These results indicate that IL-4 synthesis in T cells committed to IL-4 production can indeed occur in the absence of IL-4 when culture conditions have been optimized and suggest that therapies with anti-IL-4 MAb or with soluble IL-4 receptors designed to control the development of IL-4 synthesis in memory T cells from individuals exhibiting excessive IL-4 synthesis will be unsuccessful. Therefore, other therapies, for example, utilizing IL-12, will be required to modulate the relatively fixed programs in memory T cells that direct the development of cytokine synthesis.     

CD4~+CD25~+调节性T细胞对巨噬细胞泡沫化的影响

目的 研究CD4~+ CD25~+调节性T细胞(Tr)对巨噬细胞泡沫化过程的影响及机制.方法 磁性细胞分离器(MACS)分离CD4~+ CD25~+ T细胞及CD4~+ CD25~- T细胞,在氧化型低密度脂蛋白(oxLDL)作用下,将巨噬细胞分别与CD4~+ CD25~+ T细胞、CD4~+ CD25~- T细胞共培养48 h.采用油红O染色和细胞内脂质测定的方法观察CD4~+ CD25~+ T细胞对巨噬细胞泡沫化的影响;采用RT-PCR、real-time PCR、Western blot的方法测定泡沫细胞清道夫受体(CD36和SRA)的表达.结果 与对照组比较,CD4~+ CD25~+ T细胞可显著抑制巨噬细胞脂质聚集及清道夫受体的表达.结论 CD4~+CD25~+ T细胞可显著抑制巨噬细胞泡沫化,其作用机制可能为下调清道夫受体的表达.     

白介素-12及白介素-23对胃癌组织中CD4^＋记忆T细胞的影响

目的:探讨胃癌组织中IL-12、IL-23对CD4+记忆T细胞(CD4+Tm)的影响.方法:ELISA检测TNM不同期胃癌组织匀浆中IL-12、IL-23含量;不连续密度梯度离心法分离胃癌组织中的肿瘤浸润淋巴细胞(TIL),流式细胞仪检测TIL中CD4+ Tm及其亚群TEM和TCM在不同期胃癌组织中的分布状况.结果:TNM-Ⅰ、Ⅱ期胃癌组织中IL-12含量差别不明显,但均显著高于TNM-Ⅲ、TNM-Ⅳ期;TNM-Ⅰ期胃癌组织中IL-23的含量高于TNM-Ⅱ、TNM-Ⅲ、TNM-Ⅳ期.胃癌TIL中CD4+ Tm及TEM比例随TNM分期增加逐渐降低,而TCM比例逐渐升高.结论:胃癌组织中IL-12、IL-23含量的变化与胃癌TNM分期有关,且影响胃癌TIL中CD4+记忆T细胞及其亚群TCM和TEM的分布.