In vivo primary induction of virus-specific CTL by immunization with 9-mer synthetic peptides.

A primary cytotoxic T lymphocyte (CTL) response in vivo requires antigen presentation by cytosolic processing and can not in general be obtained by vaccination with soluble proteins. In the present work we have found that vaccination of mice with pre-processed synthetic peptides, corresponding to endogenous 9-mers produced in influenza A virus-infected cells, resulted in strong primary CTL responses. The generated CTL efficiently killed virus-infected target cells with preference for viral strains having the identical amino acid sequences to the peptides used for immunization. The optimal conditions for a primary in vivo CTL response was obtained with 100 micrograms peptide dissolved in incomplete Freund's adjuvant and injected s.c. at the base of tail. Spleen cells which had been primed 7-10 days earlier were restimulated for 5 days in vitro, using an optimal low peptide concentration (0.05 microM) and tested against virus-infected and peptide-treated target cells. The peptide-induced CTL were major histocompatibility complex class I restricted and CD8 positive.     

青、老年大鼠在Morris水迷宫中的学习记忆行为

本实验观察了22～24月龄老年大鼠和5～6月龄青年大鼠在Morris水迷宫中的学习记忆行为,并用定量分析方法比较两组动物在定位航行及空间搜索试验中的学习记忆,结果表明老年大鼠的寻找平台潜伏期明显延长,而其跨平台次数及在平台象限的游泳路线长度并未减少.提示24月龄老年大鼠获取学习记忆的能力受损伤而保持记忆的能力维持正常,这可能与二种功能衰老的不同速度及不同神经基础有关.     

TNF与急性早幼粒细胞白血病

１６例急性早幼粒细胞白自病患者血清ＴＮＦ活性明显高于正常对照（Ｐ＜０．０５），而经ＲＡ诱导分化治疗中期及治疗后明显降低（Ｐ＜０．０５），但仍高于正常对照组。各治疗时相的外周白细胞浆内ＴＮＦ平均水平及正常对照间均无明显差别（Ｐ＞０．０５），治疗前及治疗中期胞浆ＴＮＦ活性升高率明显高于治疗后或正常对照（Ｐ＜０．０５）。相关分析表明：血清ＴＮＦ活性水平与外周血ＷＢＣ总数或骨髓ＧＭ－ＣＦＵ无明显相关，而与     

The inhibitory effect of altered collagen II peptide on HLA-DRB1-restricted T-cell activation

It has been known that rheumatoid arthritis (RA)-associated antigenic peptides CII263-272 are coupled with human leucocyte antigen (HLA)-DRB1 and recognized by T-cell receptor (TCR), which in turn induced T-cell proliferation and pathogenesis of RA. Non-T-cell-stimulating type II collagen (CII) peptides might be generated by removing the amino acids responsible for TCR contact and keeping the HLA-DR-binding residues intact. In this study, a panel of altered CII peptides (APs) with consecutive or single substitutions of the TCR-contacting residues were synthesized. Through peptide binding and T-cell activation assays, we demonstrated that altered CII263-272 peptides with substitution of the TCR-contacting residues did not or barely induced T-cell activation; one of the best non-T-cell-stimulating peptide AP268-270 inhibited the binding of wild-type CII263-272 to HLA-DR1 and T-cell activation triggered by wild-type CII263-272 and HA306-318 in a dose-response manner. These data suggest that removal of the TCR-contacting residues of CII263-272 leads to HLA-DRB1 binding and low T-cell-stimulating peptides, which could potentially inhibit the T-cell response induced by HLA-DRB1-binding antigenic peptides.     

干牛骨拉伸弹性模量沿径向的分布

本文研究了干牛胫骨骨干密质骨部分沿生长轴方向的拉伸弹性模量沿径向的分布，发现此弹性模量沿径向呈非均匀分布，内外两侧的弹性模量值低于中间部分；提出了一种骨内疲劳裂纹的分布假设，并据此对测试结果进行了初步性的分析。     

Nogo(N-18)在大鼠脑干及小脑分布的免疫组织化学研究

采用免疫组织化学方法(SP法),研究了Nogo(N-18)在大鼠脑干及小脑的分布并探讨其存在的意义。结果表明,Nogo(N-18)在正常大鼠脑干以及小脑的神经核团有广泛的表达,阳性物质很强地表达于神经元的胞核内,神经元胞体、突起内表达较弱。结论:Nogo(N-18)在脑干及小脑的神经核团广泛表达提示其作为一种髓鞘源性神经突生长抑制因子在中枢神经系统中的存在,可能在正常的神经活动中起重要作用。     

ASODN对白细胞抗原Ⅰ类基因表达的影响

目的为观察针对乙型肝炎病毒（ＨＢＶ）ｘ基因特异性反义核酸（ＡＳＯＤＮ）对２２１５细胞表面白细胞抗原Ⅰ类基因（ＨＬＡ－Ⅰ）表达的影响。方法人工合成互补于ｘ基因关键区的三段反义核酸，用流式细胞仪检测ＡＳＯＤＮ对２２１５细胞表面ＨＬＡ－Ⅰ表达的影响，细胞原位杂交观察作用细胞内ＨＬＡ－ⅠｍＲＮＡ含量变化，同时用ＰＡＰ－ＥＬＩＳＡ法检测作用细胞上清中ＨＢｘＡｇ的含量。结果三段ＡＳＯＤＮ均能抑制ＨＢｘＡｇ的表达，２２１５细胞表面ＨＬＡ－Ⅰ类抗原的表达及细胞内ＨＬＡ－ⅠｍＲＮＡ含量也降低。结论ＨＢｘＡｇ表达量的降低可能系ＡＳＯＤＮ序列特异性抑制作用所致，而ＨＬＡ－Ⅰ表达的降低可能是ＨＢｘＡｇ对ＨＬＡ－Ⅰ基因启动子的激发减少的间接结果。     

北京地区病毒性脑炎患者病原体的分离和初步鉴定

１９９１年夏秋季，我们从４１例北京儿童医院临床诊断为病毒性脑炎（非乙脑）患者的７５份急性期血和／或脑脊液中分离到３３株病毒。对其中１２株进行电镜观察，电镜下均见大小相同的球形病毒颗粒，毒粒的直径约为４４．７８±１．３５ｕｍ，无囊膜，具双层蛋白外壳，视野内多见空心颗粒。超薄切片显示病毒在感染细胞的胞浆内发生，直径约为４７．６±２．３ｕｍ。正常细胞中未见病毒颗粒。对其中３株病毒进行理化性状分析，多次试验均显示该病毒抵抗５＇－碘脱氧尿苷，抵抗乙醚，耐酸，能在地鼠肾ＢＨＫ－２１和白纹伊蚊Ｃ６／３６细胞上增殖并出现细胞病变。该病毒与本室制备的披膜病毒科甲组、乙脑病毒和布尼亚病毒科的组特异性免疫腹水均不反应。脑内接种３日龄乳小白鼠可引起不规律的发病和死亡。上述结果表明，该病毒是一类４５ｕｍ左右、无囊膜、耐酸的ＲＮＡ病毒。     

一种基于独立成分分析的功能磁共振数据处理方法

独立成分分析（ICA）是统计信号处理中的一项新技术，用来从混合信号的多维观测中提取具有统计独立性的成分。我们针对功能磁共振数据处理，采用先对相邻的两体元信号作ICA分离，然后与参考信号进行相关，把相关系数大于一定阈值的体元作为刺激引起兴奋的体元，从而实现刺激的功能定位。经实际脑功能磁共振数据试验，初步证明了方法的有效性。