白芍总甙、芍药甙和白芍总甙去除芍药甙对佐剂性关节炎大鼠的免疫调节作用

福氏完全佐剂致炎后ｄ１８，佐剂性关节炎（ＡＡ）大鼠刀豆素Ａ（３ｍｇ·Ｌ－１）诱导的脾淋巴细胞增殖反应显著低于正常对照水平，脂多糖（６ｍｇ·Ｌ－１）诱导的大鼠腹腔巨噬细胞（ＰＭΦｓ）产生ＩＬ－１显著高于正常对照大鼠。０．５～３１２．５ｍｇ·Ｌ－１白芍总甙（ＴＧＰ）、芍药甙（ＰＦ）和白芍总甙去除芍药甙（ＴＧＰ－ＰＦ）均能浓度依赖性地增强ＡＡ大鼠低下的脾淋巴细胞增殖反应（量效曲线均呈钟罩形），降低ＡＡ大鼠ＰＭΦｓ过度产生ＩＬ－１（量效曲线均呈倒钟罩形）。其中，２．５～６２．５ｍｇ·Ｌ－１ＴＧＰ的调节作用显著强于ＰＦ和ＴＧＰ－ＰＦ各等剂量组。这些结果表明，上述三种药物均具有浓度和机能依赖性的双向免疫调节作用，ＴＧＰ的作用最强。     

氨甲喋呤对类风湿性关节炎患者外周血单个核细胞产生细胞因子的影响

目的研究氨甲喋呤（ＭＴＸ）对类风湿性关节炎（ＲＡ）患者外周血单个核细胞（ＰＢＭＣ）产生细胞因子的影响。方法采用ＥＬＩＳＡ双抗夹心法，观察ＲＡ患者ＴＮＦ－α、ＩＬ－６的自发分泌及ＭＴＸ和ＬＰＳ的影响，以及ＭＴＸ和ＰＨＡ对ＩＬ－１０和ＩＦＮ－γ产生的影响。结果低浓度ＭＴＸ（５ｍｇ·Ｌ－１）有抑制ＲＡ患者ＰＢＭＣ自发分泌ＩＬ－６的作用，并对ＬＰＳ（１０ｍｇ·Ｌ－１）诱导ＩＬ－６的产生具有抑制作用，对ＴＮＦ－α的自发分泌及ＬＰＳ促分泌作用无明显影响；而高浓度ＭＴＸ（１５ｍｇ·Ｌ－１）对ＴＮＦ－α、ＩＬ－６和ＩＮＦ－γ均具有抑制作用；并能促进ＰＨＡ（１０ｍｇ·Ｌ－１）诱导ＩＬ－１０的产生；使ＩＬ－１０／ＩＮＦ－γ的比率上升。结论ＭＴＸ通过调节细胞因子网络（增高Ｔｈ２型细胞产生的细胞因子和降低Ｔｈ１型细胞产生的细胞因子）来发挥免疫调节作用和抑制炎症反应，这可能是其对ＲＡ产生治疗作用机制之一     

黄芪多糖对烧伤小鼠细胞免疫功能的作用

应用小鼠烧伤模型，对黄芪多糖（ＡＰＳ）的免疫增强作用进行了体内外研究。结果表明：体内应用ＡＰＳ（２５０ｍｇ·ｋｇ－１，ｑｄ，连续５ｄ），可明显提高烧伤小鼠Ｔ淋巴细胞转化，ＩＬ－２的产生及ＩＬ－２Ｒ的表达；体外分别应用５０、１００、２５０ｍｇ·Ｌ－１的黄芪多糖，发现其可纠正烧伤小鼠Ｔ淋巴细胞转化，ＩＬ－２的产生及ＩＬ－２Ｒ表达的受抑状态，并促进巨噬细胞产生ＩＬ－１，抑制ＰＧＥ２合成，且呈剂量依赖关系；体外去除烧伤小鼠脾细胞中的巨噬细胞后，ＡＰＳ对Ｔ淋巴细胞转化，ＩＬ－２产生及ＩＬ－２Ｒ表达的调节作用消失。提示ＡＰＳ对烧伤小鼠的免疫调节作用依赖于巨噬细胞，通过调节其分泌ＩＬ－１，抑制ＰＧＥ２合成，而促进ＩＬ－２产生及ＩＬ－２Ｒ表达，进而增强Ｔ淋巴细胞增殖。     

白芍总甙治疗类风湿性关节炎的临床药理研究

对２９例类风湿性关节炎（ＲＡ）患者进行了白芍总甙（ＴＧＰ）的开放性临床试验．结果表明，大剂量ＴＧＰ（１．２～１．８ｇ·ｄ－１）服用８ｗｋ，对ＲＡ患者有明显疗效．不仅改善临床症状与体征以及降低血球沉降率与类风湿因子滴度，而且对ＲＡ患者的异常免疫功能，如外周血单个核细胞产生ＩＬ－１水平；外周血淋巴细胞的致分裂素反应与产生ＩＬ－２水平以及ＩＬ－２受体密度；抑制性Ｔ细胞的数目等均有机能依赖性恢复作用。与氨甲喋呤（ＭＴＸ）的比较试验表明．ＴＧＰ的抗关节炎作用起效较ＭＴＸ早．但疗效较温和，对ＲＡ患者异常免疫功能的影响也不完全相同，且ＴＧＰ的耐受性远较小剂量ＭＴＸ为优。本试验还表明．ＩＬ－１可作为监护ＴＧＰ疗效和调整剂量的一种灵敏而简便的指标。     

白芍总甙对B淋巴细胞增殖和白介素1生成的调节作用

白芍总甙（ＴＧＰ）对脂多糖（ＬＰＳ）诱导的小鼠脾淋巴细胞增殖反应的量效曲线呈钟形，用贴壁法除去脾细胞中巨噬细胞（ＭΦ）或加入１０μｍｏｌ·Ｌ１吲哚美辛（Ｉｎｄ）可使ＴＧＰ量效曲线的下降支消失，再加５％同系小鼠腹腔ＭΦ中或前列腺素Ｅ２（ＰＧＥ２）０．０２２０μｍｏｌ·Ｌ１可使量效曲线下降支再现．同步检测ＴＧＰ对ＬＰＳ诱导大鼠腹腔ＭΦ产生ＰＧＥ２与白介素１（ＩＬ１）．结果表明，ＴＧＰ０．５－３ｌ２．５μｇ·ｍＬ１对ＬＰＳ诱导的ＩＬ－１产生曲线呈钟形．而ＴＧＰＬＰＳ的ＰＧＥ２产生曲线呈浓度依赖性地增高；在１２．５－３１２．５μｇ·ｍＬＴＧＰ范围内，１０μｍｏｌ·Ｌ１Ｉｎｄ可使高浓度ＴＣＰＬＰＳ的ＩＬ－１释放曲线明显抬高。提示ＴＧＰ对ＬＰＳ诱导的Ｂ细胞增殖反应和ＩＬ－１诱生的负调节作用都与其促进ＭΦ释放ＰＧＥ２有关．     

白芍总甙对大鼠腹腔巨噬细胞产生肿瘤坏死因子的影响

采用Ｌ９２９细胞株细胞毒检测法，观察了白芍总甙（ＴＧＰ）对ＬＰＳ诱导大鼠腹腔巨噬细胞（ＭΦ）产主肿瘤坏死因子（ＴＮＦ）的影响。结果表明、亚适量ＬＰＳ（５ｍｇ·Ｌ－１）诱导大鼠腹腔ＭΦ培养上清在６ｈ对Ｌ９２９细胞杀伤百分率最大．ＴＧＰ（２．５ｍｇ·Ｌ－１）能促进ＬＰＳ诱导大鼠腹腔ＭＯ产生ＴＮＦ，但不改变其动力学过程。ＴＧＰ（０．５～２５０ｍｇ·Ｌ－１）对ＬＰＳ诱导ＭΦ产生ＴＮＦ量效曲线呈钟罩形．提示ＴＧＰ对ＭΦ产主ＴＮＦ具有浓度依赖性双向调节作用。不同浓度ＴＧＰ对Ｌ９２９细胞无直接杀伤作用，亦无ｒｈＴＮＦ－α拮抗作用。     

马钱子碱对小鼠淋巴细胞功能的影响

目的　观察镇痛剂量的马钱子碱（ Ｂｒｕ） 对小鼠淋巴细胞功能的影响。方法　测定绵羊红细胞（ Ｓ Ｒ Ｂ Ｃ） 致敏小鼠血清溶血素及脾抗体分泌细胞（ Ａ Ｆ Ｃ） 水平, 二硝基氯苯（ Ｄ Ｎ Ｃ Ｂ） 所致小鼠迟发性超敏反应（ Ｄ Ｔ Ｈ） ,以及丝裂原诱导小鼠脾淋巴细胞增殖和产生 Ｉ Ｌ ２ 能力。结果　 Ｂｒｕ（１０ 及２０ ｍｇ·ｋｇ － １ ,ｉｐ 显著增强小鼠对 Ｄ Ｎ Ｃ Ｂ 的特异性细胞免疫反应,但５ ,１０ 及２０ ｍｇ·ｋｇ － １ 不影响对 Ｓ Ｒ Ｂ Ｃ 的特异性体液免疫反应。对环磷酰胺（ Ｃｙｃ） 降低的上述反应,３ 个剂量的 Ｂｒｕ均有显著恢复作用（ Ｐ＜ ００５ ～００１） 。 Ｂｒｕ １０ ｍｇ·ｋｇ－ １ ｉｐ增强 Ｃｏｎ Ａ 及 Ｌ Ｐ Ｓ 诱导的脾淋巴细胞增殖（ Ｐ＜ ００５） ,对 Ｃｙｃ 所降低的脾淋巴细胞尤其 Ｔ 细胞增殖反应, Ｂｒｕ ５ ～２０ｍｇ·ｋｇ － １ 范围内均使其恢复（ Ｐ＜ ００５ ～００１） 。 Ｂｒｕ ０１ ～１００ ｍｇ· Ｌ－ １ 在体外对丝裂原诱导小鼠脾淋巴细胞产生 Ｉ Ｌ ２能力无明显影响。结论　镇痛有效剂量的 Ｂｒｕ 对小鼠淋巴细胞具有功能依赖性的免疫调节作用     

白芍总甙对大鼠腹腔巨噬细胞产生肿瘤坏死因子的调节机制

目的：研究不同浓度白芍总甙（ＴＧＰ）调节大鼠腹腔巨噬细胞（ＭΦ）产生肿瘤坏死因子（ＴＮＦ）作用。方法：在ＭΦ培养系统中有或无环氧酶抑制剂和钙调蛋白抑制剂等工具药，测定４５Ｃａ内流、ＰＧＥ２和ＴＮＦ含量。结果：ＴＧＰ（０．５～１０ｍｇ·Ｌ－１）明显促进ＬＰＳ诱导ＭΦ的４５Ｃａ内流和ＴＮＦ产生。线性回归分析表明，４５Ｃａ内流和ＴＮＦ产生呈明显正相关。三氟拉嗪（４０μｍｏｌ·Ｌ－１）可阻断ＴＧＰ促进ＬＰＳ诱导ＭΦ产生ＴＮＦ。ＴＧＰ－ＬＰＳ的ＴＮＦ释放曲线呈钟罩形，而ＴＧＰ－ＬＰＳ的ＰＧＥ２产生曲线呈浓度依赖性升高。当ＴＧＰ在低浓度（０．５～１２．５ｍｇ·Ｌ－１）时，ＴＮＦ与ＰＧＥ２产生明显正相关，而高浓度（１２．５～２５０ｍｇ·Ｌ－１）两者呈明显负相关。吲哚美辛（１０μｍｏｌ·Ｌ－１）可使ＴＮＦ量效曲线下降支消失，而Ｎω亚硝基－Ｌ－精氨酸（１５μｍｏｌ·Ｌ－１）对此无明显影响。结论：低浓度ＴＧＰ对ＴＮＦ产生上调作用可能与促进４５Ｃａ内流，提高钙调蛋白活性从而促进ＰＧＥ２分泌等有关，而高浓度下调作用是可能与ＭΦ自身产生大量ＰＧＥ２介导有关。     

白芍总甙对大鼠腹腔巨噬细胞产生前列腺素E_2的作用及部分机制研究

白芍总甙（ＴＧＰ，０．０１～１００ｍｇ·Ｌ－１）对亚适浓度Ａ２３１８７（０．１μｍｏｌ·Ｌ－１）激活的大鼠腹腔巨噬细胞（ＰＭΦ）产生的前列腺素Ｅ２（ＰＧＥ２）呈现低浓度促进和高浓度抑制的双向调节作用。而ＴＧＰ对最适浓度Ａ２３１８７（１μｍｏｌ·Ｌ－１）激活的ＰＭΦ产生的ＰＧＥ２呈浓度依赖性的抑制作用，其ＩＣ５０为１６．７ｍｇ·Ｌ－１。在整体模型上，ＴＧＰ（５０ｍｇ·ｋｇ－１×１０ｄ）能使佐剂性关节炎（ＡＡ）大鼠ＰＭΦ产生过高的ＰＧＥ２恢复正常水平。采用Ｆｕｒａ－２／ＡＭ荧光法测定ＴＧＰ对Ａ２３１８７（１μｍｏｌ·Ｌ－１）诱导正常大鼠ＰＭΦ胞内游离钙离子浓度［Ｃａ２＋］ｉ，发现ＴＧＰ（≤１０ｍｇ·Ｌ－１）对ＰＭΦ［Ｃａ２＋］ｉ无明显影响，而ＴＧＰ在（１０～１００ｍｇ·Ｌ－１）时，对ＰＭΦ［Ｃａ２＋］ｉ有一定抑制作用。提示高浓度ＴＧＰ对ＰＧＥ２的负向调节作用可能与抑制细胞内钙有关。     

多抗甲素对人免疫功能的影响

本文应用［３Ｈ］ＴｄＲ参入法研究多抗甲素（ＰＡＡ）对人的淋巴细胞增殖反应和ＮＫ细胞活性的影响，结果表明：１．１０００μｇ·ｍｌ－１ＰＡＡ对正常人和食道癌患者外周血淋巴细胞（ＰＢＬ）增殖有直接刺激作用。在促细胞分裂剂ＰＨＡ作用下，ＰＡＡ促进正常人和食道癌患者ＰＢＬ增殖反应的浓度分别为１００～１０００μｇ·ｍｌ－１和１０～１００μｇ·ｍｌ０－１，提示ＰＡＡ有免疫调整作用。２．食道癌患者ＰＢＬ的ＮＫ细胞活性明显低于正常人。ＰＡＡ对正常人和食道癌患者ＮＫ细胞活性有明显的增强作用，分别上升１２．３９±４．５％和１９．６６±５．４％，ＰＡＡ对ＮＫ细胞活性的增强作用表现为时间和剂量依赖性。     

Effects of FK506 and other immunosuppressive anti-rheumatic agents on T cell activation mediated IL-6 and IgM production in vitro

The objective of this study was to investigate the therapeutic potential of FK506 and other immunosuppressive agents for the treatment of rheumatoid arthritis (RA), focusing on the effects on in vitro IL-6 production and IL-6-mediated immune response. We employed an in vitro model producing IL-6 via T cell activation in human PBMC, based on the hypothesis that T cells play a central role in the pathogenesis of RA. FK506 potently inhibited IL-6 production from PBMC stimulated with anti-CD3 and anti-CD28 monoclonal antibody (anti-CD3/CD28). Cyclosporin A (CsA) also inhibited the anti-CD3/CD28 induced IL-6 production but was about 100 times less potent than FK506. Dexamethasone (DEX) inhibited both anti-CD3/CD28 and LPS induced IL-6 production at almost the same concentration. Methotrexate (MTX) did not affect cytokine production. Anti-CD3/CD28 stimulated PBMC culture supernatants were found to enhance IgM production in SKW6.4 cells. The effects of anti-CD3/CD28 stimulated culture supernatants in the presence of agents on IgM production in SKW6.4 cells were investigated. FK506 and CsA led to suppression of IgM production induced by culture supernatants probably via inhibition of IgM inducible cytokine production from PBMC. DEX profoundly enhanced IgM production, although IL-6 production from PBMC was strongly inhibited by the agent. MTX decreased IgM production although it has no inhibitory effect on IL-6 production. The present study suggests that FK506 is the most effective among the four agents for the suppression of IL-6 production and IL-6-mediated autoantibody production in T cell activation related autoimmune diseases such as RA.     

1α,25-二羟维生素D_3对患者PBMC分泌的IFN-α和IL-10水平的影响

目 的 探 讨 １α，２５－二羟 维生 素 Ｄ_３（１α，２５－（ＯＨ ）２Ｄ ）对 系 统性 红斑 狼 疮（ＳＬＥ）患 者 外周 血 单个 核 ３细 胞（ＰＢＭ Ｃ）分 泌的 白细 胞 介素 （ＩＬ）－１０ 和 干扰 素 （ＩＦＮ ）－α水平 的 影响 。方法 ２０ 例 ＳＬＥ 患 者和 １０ 名健 康 志愿者 ＰＢＭ Ｃ 的提 取 采 用 Ｆｉｃｏｌ密 度 梯 度 离 心 法 ，ＳＬＥ 组 和 对 照 组 在 不 加 或 加 入 １α，２５－（Ｏ Ｈ ）２Ｄ３ 的 情 况 下 孵 育 ７２ ｈ收 集培 养 上清 ，上 清液 ＩＬ－１０ 和 ＩＦＮ－α水平 检 测采 用酶 联 免疫 吸附 试 验（ＥＬＩＳＡ ）。结 果 与 正常 对 照组 相比 ，ＳＬＥ组 ＰＢＭ Ｃ 中 ＩＬ－１０ 和 ＩＦＮ－α水 平 明 显 增高 （Ｐ＜０．０１）。０．０１ ｍ ｏｌ／Ｌ １α，２５－（Ｏ Ｈ ）２Ｄ３ 的 加 入 明 显 抑 制 了 ＳＬＥ 组ＰＢＭ Ｃ 中 ＩＦＮ －α的 产 生 （Ｐ＜０．０１），增 加 了 ＳＬＥ 组 ＰＢＭ Ｃ 中 ＩＬ－１０ 的 产 生 （Ｐ＜０．０１），但 对 正 常 对 照 组 ＩＦＮ －α和ＩＬ－１０ 水平 无明 显 影响 。结 论 １α，２５－（ＯＨ ）２Ｄ 可 能 抑制 体外 培 养的 ＳＬＥ 患 者 ＰＢＭ Ｃ ＩＦＮ －α的产 生     

Modulation of cytokine production from human mononuclear cells by several agents

We investigated the effects of drugs, especially anti-pulmonary disease agents, on the production of cytokines from human peripheral blood mononuclear cells (PBMC). Roxithromycin (RXM), a macrolide antibiotic with the structure of 14-member macrocycline ring increased adherent cells (monocyte/macrophages), whereas it suppressed the proliferation of PBMC stimulated with phytohemagglutinin (PHA). RXM suppressed the production of IL-1 beta and TNF-alpha from lipopolysaccharide (LPS)-stimulated PBMC in a dose-dependent manner. Levofloxacin, a fluorinated quinolone, increased IL-2 production by PBMC stimulated with PHA. The production of GM-CSF and soluble IL-2 receptor was suppressed at high concentrations of LVFX. LVFX suppressed IL-1 beta production, but did not the production of TNF-alpha and IL-8 production. A beta-adrenoceptor agonists (beta-agonist), procaterol, clenbuterol, fenoterol and terbutaline suppressed the production of TNF- and IL-1 beta. TNF-alpha production was almost completely suppressed by dibutyryl cyclic AMP (dbcAMP), whereas IL-1 beta production appeared to be partially refractory even at the highest concentration examined. Both procaterol and theophylline elevated cAMP levels in LPS-stimulated PBMC, but the effect of procaterol was limited. The inhibition of the production of TNF-alpha and IL-1 beta by procaterol was additively potentiated with theophylline. Of examined phosphodiesterase (PDE) isozyme inhibitors type IV PDE inhibitors were more effective in inhibiting the production of TNF-alpha and IL-1 beta by LPS-stimulated PBMC than a nonselective, type III or type III/IV inhibitor. The addition of the beta-agonist increased the inhibitory effect of tested PDE inhibitors on the production of TNF-alpha and IL-1 beta Type IV, type III and nonselective PDE inhibitors were effective in inhibiting the production of IFN-gamma and IL-2 in a dose-dependent manner. In contrast, the production of IL-4 and IL-5 was inhibited by only the highest concentration of type IV inhibitor, and other agents had no effect on the production. Similarly, dbcAMP inhibited the production of IFN-gamma and IL-2 more potently than that of IL-4 and IL-5. The addition of the beta-agonist increased the inhibitory effect of tested PDE inhibitors on the production of IFN-gamma and IL-2 production. These findings indicate that these agents have an immunodulatory action on the production of cytokines by PBMC and also indicate that they could be potent pharmacological agents for the treatment of diseases in which several cytokines are important etiological factors.     

白芍总甙和丹皮总甙对松果腺调节炎症免疫反应的影响

本文采用普萘洛尔（１５ｍｇ·ｋｇ－１·ｄ－１×７ｄｉｐ），双侧颈上神经节切除以及松果腺切除法观察了白芍总甙（ＴＧＰ）和丹皮总甙（ＴＧＭ）对松果腺调节炎症，免疫反应的影响。     

Inhibition of interleukin-12 expression by alpha-thrombin in human peripheral blood mononuclear cells: a potential mechanism for modulating Th1/Th2 responses

In addition to its central role in blood coagulation and hemostasis, human alpha-thrombin is a powerful regulator of inflammatory responses and is known to affect cell-mediated immunity. Interleukin (IL)-12 is a strong promoter of the development of Th1-type lymphocytes and its downregulation implies a positive feedback mechanism for development of Th2 responses. We have previously shown that thrombin enhances the release of IL-6, a Th2-related cytokine, in human peripheral blood mononuclear cells (PBMC). Here we show that thrombin downregulates IL-12 production at both protein and mRNA levels in human PBMC. The inhibition of IL-12 production was accompanied by an enhanced release of IL-10, which inhibits Th1-related processes and promotes Th2-type responses. The use of proteolytically inactive thrombin and of the specific thrombin receptor agonist peptide, SFLLRN, reveals that this downregulation is thrombin-specific and requires thrombin proteolytic activity. In addition, activation of coagulation inhibits IL-12 production in whole blood cultures, confirming the tight relationship between the coagulation pathway, where thrombin is a key enzyme, and inflammation. Decreased IL-12 production appears to be related also to IL-10 production, since the addition of an anti-IL-10 monoclonal antibody to thrombin-treated PBMC resulted in a partial restoration of IL-12 production. In conclusion, the observation that thrombin significantly affects the production of IL-12, as well as of IL-10, implies a concerted role orchestrated by thrombin in PBMC that could be crucial to effective immunity and inflammation.     

白芍总甙对大鼠佐剂性关节炎及其免疫功能的影响

本文研究了白芍总甙(TGP)对大鼠佐剂性关节炎(AA)的治疗作用及其机理。TGP 50 mg·kg~1·d~1 ig,连续11d对大鼠多发性关节炎有明显的防治作用,同时可使AA大鼠腹腔巨噬细胞升高的H_2O_2和白细胞介素(IL-1)水平下降,并可使AA大鼠低下的胸腺细胞有丝分裂原反应及脾淋巴细胞产生IL-2能力恢复正常。表明TGP对AA大鼠有抗炎和机能依赖性的免疫调节作用。     

Inhibition of lymphocyte activation and function by the prenylation inhibitor L-778,123

Prenylated Ras GTPases transduce signals from the T cell receptor, CD28 costimulatory receptor and IL-2 receptor. Since signals from these receptors mediate T cell activation, proliferation and survival, we hypothesized that the prenylation inhibitor L-778,123 would impart immunomodulation.The effect of L-778,123 on T cell activation (CD71 or CD25 surface expression) was determined by flow cytometry. Peripheral blood mononuclear cell (PBMC) proliferation in the presence of L-778,123 and/or cyclosporine (CsA) was determined by [3H]thymidine incorporation. The ability of L-778,123 to inhibit IL-2 receptor signaling was investigated by measuring IL-2 induced proliferation in CTLL-2 cells and IL-2 prevention of apoptosis in activated human PBMC. L-778,123 inhibited lectin induced expression of CD71 and CD25 with IC50's of 6.48 +/- 1.31 microM and 84.1 +/- 50.0 microM, respectively. PBMC proliferation was inhibited by L-778,123 with an IC50 of 0.92 +/- 0.23 microM, and addition of CsA did not increase the potency. L-778,123 did not inhibit IL-2 and IFN-gamma production by T cells. L-778,123 abrogated IL-2 induced proliferation of CTLL-2 cells with an IC50 of 0.81 +/- 0.44 microM. However, L-778,123 minimally reversed the prosurvival effect of IL-2 in activated lymphocytes. IL-2 ligand and receptor production during T cell activation are relatively unaffected by L-778,123. However, the activation and proliferative effects of IL-2 on T cells are potently blocked by L-778,123. These results reveal a selective blockade of the IL-2 cytokine axis distal to the IL-2 receptor by the L-778,123 and warrant evaluation of prenylation inhibitors in treating transplant rejection and autoimmune diseases.     

白芍总甙的免疫调节作用及机理

本文报道TGP的免疫调节作用,并探讨其作用机理。TGP 5 mg·kg~(-1)·d~(-1) ip 5～8 d对Cy诱导的小鼠DTH反应增高或降低呈反向调节,也可拮抗Cy诱导的小鼠溶血素生成量下降,表现出双向调节特征。TGP本身无有丝分裂原样作用,但终浓度45和450 ng/ml可促进ConA诱导小鼠脾淋巴细胞的增殖;同样浓度还可促进NDV诱导的人脐血白细胞产生IFNα,TGP的这种免疫增强作用可能是其体内向上恢复免疫功能的机理之一。TGP 5～10 mg·kg~(-1)·d~(-1) ip 4～8 d对DXM抑制小鼠溶血素的生成及DTH反应无明显拮抗作用,同时TGP还可使正常小鼠和DXM处理的SRBC致敏小鼠血浆CS水平下降。