Effect of “Re Du Qing” on the activation,proliferation and membrane fluidity of lymphocytes

Summary Effects of Chinese Medicinal Preparation “Re Du Qing” (RDQ) on the activation, proliferation and membrane fluidity of T lymphocytes from human peripheral blood Were studied by means of³H-TdR incorporation and DPH fluorescence polarization. The results showed that “RDQ” can:1) significantly inhibit the activation of T lymphocytes; 2) restrain the proliferation of activated T lymphoblasts in the presence of exogenous interleukin-2 (IL-2); and 3) increase the membrane fluidity of T lymphocytes and antagonize the decreased fluidity of lymphocyte membrane mediated by Con A or PHA. The functional abnormalities of T lymphocytes in some autoimmune diseases such as arthritis and the usefulness of RDQ in the treatment of these diseases were also discussed.     

Interocular mismatch in spatial frequency and directionality characteristics of striate cortical neurones

Summary Spatial-frequency dependence of directional tuning and directional bias was compared, for both eyes, in four previously established discrete classes of binocular feline striate cortical neurones. Two classes (respectively direction-selective or bidirectional at optimal spatial frequency) were directionality invariant at all spatial frequencies. In the remaining two classes, both directionbiased at optimal spatial frequency, directional bias either altered or reversed with change in spatial frequency. In all four classes, the directional tuning of a majority of neurones sharpened at high spatial frequency through either eye, although the bandpass characteristics were sometimes dissimilar for the two eyes. All neurones were of the same type through either eye. Amongst the two classes of direction-biased neurones, the strength of bias was commonly different through the two eyes. Where reversal of bias occurred, that reversal took place at different spatial frequencies for each eye. Thus, the direction and orientation preferences of cortical neurones are fixed at optimal spatial frequency, but their envelope of tuning to a gamut of spatial frequencies is not. These differences are potentially related to binocular coding of visual perspective, including dynamic object rotation in visual space.     

Modulation of human T cell functions by surface sulphydryl groups: differential effects on IL-2 production and responsiveness.

An impermeable thiol blocker has been used to investigate the role of sulphydryl (SH) groups in the production of and responsiveness to IL-2 by normal human T lymphocytes. Surface SH blockade of mononuclear cells prior to incubation with mitogen (phytohaemagglutinin, concanavalin A, CD3 MoAb) had no effect on production of IL-2 but markedly impaired cellular responsiveness to exogenous IL-2. Studies using MoAbs indicated that this effect was accompanied by decreased expression of both the CD25 and p75 subunits of the IL-2 receptor. Blocking surface SH groups did not affect binding of IL-2 to p75 on unstimulated mononuclear cells, but inhibited binding to high-affinity receptors on a T lymphoma cell line. The data are consistent with the hypothesis that sulphydryl groups on the IL-2 receptor are required for its function and may be involved in the interaction of the CD25 and p75 subunits leading to generation of the high-affinity binding site. The surface thiol identified on the IL-2 receptor may be a candidate for oxidation on cells from patients with chronic inflammatory diseases such as rheumatoid arthritis and thus contribute to the aberrant function of T cells in these patients.     

子宫内膜异位症及卵巢癌腹腔IL-6、IL-8变化的临床意义

目的:探讨白细胞介素6(IL-6)、白细胞介素8(IL-8)与子宫内膜异位症(endomotriosisEMs)卵巢癌的发生发展关系。方法:采用双抗体夹心ABC-酶联免疫吸附实验(ELISA)对EMs患者30例、血清及腹腔液中IL-6、IL-8进行检测,并以卵巢癌患者10例、卵巢良性肿瘤患者30例、正常妇女血清30例做对照组。结果:EMs组与卵巢癌组患者血清及腹腔液中IL-6、IL-8水平明显高于对照组(P<0.01),EMs组与卵巢癌组对比无显著性差异(P>0.05)。结论:EMs患者腹腔液中IL-6、IL-8异常增高是腹腔免疫内环境失衡,与EMs的发生发展有关,在药物治疗中血清IL-6、IL-8可作为EMs疗效和预后的指标之一。     

IL-1B-31及IL-1RN基因多态性与胃癌易感性关系

目的：研究白细胞介素1B基因(IL-1B)启动子区域-31位点和白细胞介素1受体拮抗剂基因(IL-1RN)多态性在中国南方人群胃癌患者与健康对照中的分布，初步探讨其各基因型与胃癌的关联性。方法：收集285例胃癌患者与265例健康人群的外周血标本和流行病学调查资料，提取基因组DNA，IL-1RN基因型采用PCR方法直接确定。IL-1B基因采用PCR—RFLP方法分型。结果：IL-1RN基因有5种基因型，分别是1／1、1／2、1／3、1／4、2／2型，其频率在病例组中分别为81．9％、14．6％、7．0％、1．8％和1．1％。而在对照组中分别为81．6％、16．5％、0、0．8％和1．2％。各基因型在病例与对照组中分布没有显著性差异。IL-1B基因-31位点3种基因型C／C、C／T、T／T在胃癌病例组中频率分别为21．8％、48．6％和29．6％。而在对照组中分别为27．9％、48．8％和23．3％。与C／C型比较，携带T／T基因型者胃癌发生的危险性增加63．3％(OR=1．633，95％CI=1．014～2．628)。这一危险性在高年龄组、男性、饮酒、HP感染阳性、有癌症家族史的人中更为显著。结论：IL-1B基因启动子区域-31位点多态性可能与该人群胃癌易感性相关；未发现IL-1。RN基因多态性与胃癌易感性关联。     

病毒白细胞介素-10转基因在造血干细胞中的表达

目的　观察逆转录病毒转病毒白细胞介素 10 (vIL 10 )基因在体内的表达。方法　用MSCVneo vIL 10重组体在体外转导CBA (H 2 K)小鼠的造血干细胞 (HSCs) ,给经致死照射(90 0rads)的 2 0只同基因CBA(H 2 K)小鼠注入经MSCVneo vIL 10转染的HSCs ,2× 10 6HSCs/只。酶联免疫吸附测定 (ELISA)、逆转录 聚合酶链反应 (RT PCR )、Westernblot分析vIL 10的表达。结果　移植MSCVneo vIL 10转染HSCs的 2 0只小鼠 ,移植后 8周用ELISA检测 ,其中 15只小鼠血清的vIL 10浓度为 :2 70～ 13 40ng/L ,5只小鼠血清的vIL 10为阴性。 12周后有 2只小鼠vIL 10测不出 ,13只小鼠长时间表达vIL 10达 6个月。对照组小鼠血清vIL 10均为阴性。RT PCR和Westernblot证实小鼠的器官均有vIL 10的mRNA和蛋白的表达。结论　逆转录病毒能有效地将vIL 10基因导入造血干细胞并在体内长时间表达。     

IL-2在移植免疫中的研究进展

随着器官移植手术技术的逐渐成熟,移植后免疫排斥反应已成为制约器官移植的瓶颈。IL-2在免疫系统中起着关键作用,而且与免疫排斥和免疫耐受关系密切,因此,更好的理解 IL-2在免疫和自身耐受中的生理作用,对临床治疗中控制IL-2信号,获得更好治疗效果有指导意义。     

脑囊虫病患者血清和脑脊液IL-6和SIL-2R的水平及其与癫痫发作的关系

目的测定脑囊虫病患者血清和脑脊液IL-6和SIL-2R水平,并探讨其与癫痫发作的关系。方法应用双抗体夹心ELISA法测定45例脑囊虫病患者和43例对照组患者血清和脑脊液IL-6利SIL-2R的水平,其中脑囊虫病组又分为癫痫组(23例)和非癫痫组(22例),分别进行了比较分析。结果脑囊虫病组血清SIL-2R水平明显高于对照组(P<0.05);而IL-6水平与对照组比较无显著性差异(P>0.05)。脑囊虫病组脑脊液SIL-2R和IL-6水平均较对照组低(P<0.01,P<0.05);脑囊虫病组血清SIL-2R和IL-6水平与脑脊液SIL-2R和IL-6水平均呈正相关(r=0.322,P<0.05;r=0.768,P<0.01)。脑囊虫病癫痫组血清SIL-2R和IL-6水平与非癫痫组比较均无显著性差异(P>0.05);而脑脊液SIL-2R和IL-6水平癫痫组明显高于非癫痫组(P<0.01)。结论脑囊虫病患者外周血和中枢神经系统存在免疫激活,且SIL-2R和IL-6可能参与了癫痫发生过程。     

IL-6对人精子顶体反应影响机制的初步探讨

目的:探讨IL-6对人精子顶体反应(AR)的影响机制。方法:采用BAEE/ADH法测定精子顶体酶的活性,以及通过FITC-PSA法检测精子顶体反应。结果:IL-6可诱导精子顶体酶及超氧化物歧化酶(SOD)的活性,促进精子顶体反应;胞外Ca2+单独不能诱导精子顶体反应,且没有胞外Ca2+的参与,IL-6也不能诱导精子顶体反应;蛋白激酶C(PKC)抑制剂calphC能逆转IL-6诱导的精子顶体反应。结论:IL-6对精子顶体反应有一定的促进作用,可能通过诱导精子的顶体酶和SOD活性等途径来实现,在此作用中,也涉及了PKC的激活,且还需要外源性Ca2+的参与。     

Effect of gamma-interferon on IL-1 alpha, beta and receptor antagonist production by normal human keratinocytes

Abstract In inflammatory dermatoses. activated T cells produce inter-feron-gamma (IFN-γ), which interacts with keratinocytes and contributes to the direct activation of these cells by inducing, among other factors, the expression of HLA-DR antigens and intercellular adhesion molecule-1. However, the action of IFN-γ on epidermal cell cytokine production is not known. Our aim was to assess the effect of IFN-γ on the production of IL-1 by normal human keratinocytes cultured in low calcium medium (MCDB153). In comparison with controls, the addition of nontoxic IFN-yγ concentrations (50-500 U/ml) to cell cultures induced a significant increase of IL-1α and IL-1β production predominantly after 100 U/ml treatment in the cell extracts as well as in the supernatants at 24h and 48h. The production of the antagonist. IL-1RA, was also enhanced and the effect of the critical concentration (100 U/ml) was more evident. However, the absence of a characteristic dose response could not be explained by an antiproliferative effect of high IFN-γ concentrations (250 and 500 U/ml) on cultured keratinocytes or by the induction of the nuclear stress protein, Hsp72. two phenomena known to down-regulate IL-1 biosynthesis. In conclusion, the modifications in keratinocyte IL-1 production under IFN-γ stimulation can contribute to activate the epidermal cells and thus involve them in the local immune response.