肾血管性高血压大鼠发病过程中心血管AT1-受体自身抗体的变化

实验观察了肾血管性高血压（RVH）大鼠血浆中抗AT1－受体自身抗体在发病过程中的作用及其变化规律。采用两肾一夹Goldblatt RVH模型,以合成的大鼠AT1－受体细胞外第二环165－191位氨基酸序列作为特慢性抗原,用SA－ELISA法检测大鼠血清中抗AT1-受体自身抗体。结果表明,RVH模型组术后2周时大鼠血清中抗AT1－受体自身抗体的阳性率和平均滴度与术前相比明显增高,较高的阳性率和平均滴度持续几周后逐渐下降,12周时下降到正常水平。结果提示,自身免疫机制参与了高血压的形成,抗AT1－受体自身抗体可能与心肌肥厚有关。     

蛇胸腺肌样细胞呈CRF和Mot免疫反应阳性

蛇胸腺肌样细胞呈ＣＲＦ和Ｍｏｔ免疫反应阳性陆宇燕李丕鹏（烟台师范学院生物系烟台２６４０２５）关键词蛇胸腺ＣＲＦＭｏｔ胸腺微环境在Ｔ细胞发育分化过程中起着重要的作用,因此研究胸腺基质细胞的生物学特性已成为免疫生物学的又一热点。胸腺微环境结构复杂,基质...     

The kinetics of IL—4 and IFN—γ gene expression in Mice after Trichosansin immunization

Trichosanthin (TCS) is a potent allergen to mice.According to our previous experiments,it could bring out the IgE response to ovabumin (OVA) if TCS was given one day before OVA immunization,while OVA alone could not induce IgE to it.In this work,the kinetics of interleukin 4(IL-4) and interferon γ(IFN-γ) gene expression in the mesenteric lymph node (MLN) of TCS-immunized mice was investigated using a semi-quantitative RT-PCR method.It indicated that TCS induced significant IL-4 gene expression and the peaks of IL4 gene expression were on day one after TCS immunization in both primary and secondary response.In contrast,the IFN-γ gene expression was suppressed.Furthermor,the IL-4 gene expression in the secondary response was lower than that in the primary response.Thus the presence of IgE memory B cells were studied.Results showed that the amount of mature IgE mRNA arose significantly and rapidly one day after TCS restimulation,while in the MLN of the mice primed 30 days before and without boost,it was almost as the same amount of the unimmunized control.These findings suggest the existence of the IgE memory B cells in the mice after the primary TCS immunization.     

爪蟾卵母细胞表达猫脊髓背根神经节初级感觉神经元的速激肽受体

提取猫的背根神经节 (DRG)中的Poly(A) ⁺RNA ,注射到非洲爪蟾卵母细胞中进行表达 ,2d后通过双电极电压箝技术检测爪蟾卵母细胞对速激肽受体激动剂的反应 .NK- 1受体特异激动剂 [Sar⁹,Met(O₂ ) ¹¹]SP (Sar -SP) ,NK -2受体特异激动剂 [β- Ala⁸] neurokininA ( 4～ 1 0 ) (Ala -NKA)和神经激肽A(NKA)产生相似的内向电流 .由一个快速的锋电流和持续数分钟的振荡电流组成 .Sar- SP的反应只被NK- 1受体特异拮抗剂L- 6 6 8,1 6 9( 1 μmol/L)阻断 ,而NKA及Ala- NKA的反应则仅被NK -2受体特异拮抗剂L -6 5 8,877( 1 μmol/L)阻断 .注射猫脊髓背角Poly(A) ⁺RNA在爪蟾卵母细胞中表达的速激肽受体的反应基本相似 .这些速激肽受体的反应都具有强烈的脱敏性 .这是首次在爪蟾卵母细胞受体表达系统证明DRG神经元有速激肽NK- 1和NK -2受体 ,从而提示在伤害性初级传入末梢上可能存在速激肽突触前自身受体     

负免疫应答

负免疫应答是指生物个体的免疫系统对抗原刺激不产生免疫应答或仅产生不易察见的免疫应答,包括免疫耐受、免疫麻痹、免疫缺陷、免疫抑制四种状况。有的学者把免疫麻痹列入免疫耐受,把免疫抑制列入继发性免疫缺陷。(一)免疫耐受是指机体免疫系统接触某一抗原后形成的特异性负免疫应答。机体对这一抗原不能产生     

痕量胺相关受体1的免疫调节作用及其机制研究进展

痕量胺是分布于中枢神经系统和外周组织中的一类内源性活性化合物,它们在亚细胞定位和化学结构等方面类似于常见的生物胺。痕量胺相关受体(trace amine-associated receptor, TAAR)是脊椎动物中进化保守的一类G蛋白偶联受体,其中TAAR1参与多巴胺、5-羟色胺等单胺能递质传递的调节,被认为是精神分裂症、抑郁症和药物成瘾等精神疾病潜在的治疗新靶点。此外,TAAR1在外周组织中也有显著表达。研究提示痕量胺能系统的稳态失调会导致外周免疫系统的过度激活,还会诱发中枢免疫炎症反应。由于TAAR1在免疫反应的产生或调节中可能发挥重要作用,TAAR1调节剂有望成为一种治疗免疫相关疾病的新药物。     

人类抗中心体自身抗体的研究

用间接免疫荧光法以小鼠腹水癌细胞为底物从硬皮病病人的自家抗血清中筛选出几个抗中心体的抗血清。因为中心体是化学构分复杂的细胞结构,而自家抗体又是多克隆的,故本文只用其中一个抗中心体抗血清作进一步研究。为了定位其抗原,同时也采用了Ｌ９２９培养细胞为底物。发现这抗血清结合于微管,有丝分裂期的纺锤体,中心体以及其它一些核结构。同时也用此抗血清在细胞裂解液的免疫印迹膜上检出了分子时与微管蛋白相同的主要条带,     

拉赫钝缘蜱对豚鼠免疫细胞的影响

本文报告用拉赫钝缘叮咬豚鼠后ａ－醋酸萘酯酶（ＡＮＡＥ）阳性率于第３天较对照组有明显降低,１４ｄ仍低于正常值水平。认为酯酶染色法测定Ｔ淋巴细胞ＡＮＡＥ阳性率的高低可作为判定细胞免疫功能的一项指标。     

DNA vaccine of SARS-Cov S gene induces antibody response in mice

The spike (S) protein, a main surface antigen of SARS-coronavirus (SARS-CoV), is one of themost important antigen candidates for vaccine design. In the present study, three fragments of the truncated S protein were expressed in E. coli, and analyzed with pooled sera of convalescence phase of SARS patients. The full length S gene DNA vaccine was constructed and used to immunize BALB/c mice. The mouse serum IgG antibody against SARS-CoV was measured by ELISA with E. coli expressed truncated S protein or SARS-CoV lysate as diagnostic antigen. The results showed that all the three fragments of S protein expressed by E. coli was able to react with sera of SARS patients and the S gene DNA candidate vaccine could induce the production of specific IgG antibody against SARS-CoV efficiently in mice with seroconversion ratio of 75% after 3 times of immunization. These findings lay some foundations for further understanding the immunology of SARS-CoV and developing SARS vaccines.     

超抗原及其诱导的免疫反应

超抗原作为一类强大的免疫激活因子,可活化Ｔ细胞和抗原呈递细胞,其作用范围从Ｔ细胞增殖的诱导,众多细胞因子释放,免疫抑制到免疫耐受和免疫无反应性,并与自身免疫和免疫机能不全有关。超抗原由某些细胞,病毒,支原体和寄生虫产生,它可以激活比普抗原多达数千倍的Ｔ淋巴细胞（包括ＣＤ＾＋４和ＣＤ＾＋８Ｔ细胞）,并可活化ＮＫ细胞和单核细胞。超抗原以不同于普通抗原的方式与抗原呈递细胞（ＡＰＣ）上ＭＨＣⅡ类子分子及Ｔ