慢性癫痫模型动物海马内GABA能神经元的超微结构改变

用马桑内酯诱发小鼠性性癫痫模型，借助免疫电镜方法对海马的ＧＡＢＡ能神经元的超微结构进行观察，可见小鼠海马内ＧＡＢＡ免疫反应阳性神经元弥散分布于除锥体细胞层和颗粒细胞层外的各部。慢性癫痫上鼠海马内的ＧＡＢＡ免疫反应性神经元胞体和末梢均呈现程度不同的结构损伤，包括线粒体肿胀，细胞器崩解和神经末梢变性，ＧＡＢＡ样轴突末梢可与免疫反应阴性的树突构成传出性轴－树突触，也可接受免疫反应阴性轴末梢的传入性轴－轴     

一氧化氮与白细胞精子症不育的关系探讨

目的　探讨一氧化氮 (NO)与白细胞精子症不育的关系。方法　参照WHO标准方法 ,进行精液常规分析。采用过氧化物酶染色法检测精液中白细胞密度。用改良的低渗肿胀法检测精子细胞膜的完整性。采用镀铜镉还原荧光法 ,检测精液中NO代谢产物硝酸盐 (NO 3 )。结果　白细胞精子症不育组白细胞的密度为 (1.4 8± 0 .90 )× 10 9/L ,NO水平为 (10 3.5± 2 .0 ) μmol/L ,显著高于正常生育组的(0 .73± 0 .2 8)× 10 9/L和 (41.6± 1.8) μmol/L (P分别为<0 .0 5和 <0 .0 0 1)。精子的活动率、精子速度试验 (SVT)及精子头、尾部膜完整率 ,均明显低于生育组 (P <0 .0 1) ,而精子的死亡率则显著高于生育组 (P <0 .0 1)。结论　NO水平与白细胞密度呈正相关 ;与精子的活动率、SVT及精子头、尾膜的完整率呈负相关。表明当精液中的白细胞增高时 ,可产生过量的NO导致精子中毒受损使精子的受精能力下降     

CO对局灶性缺血脑组织血脑屏障通透性的影响

目的:研究一氧化碳及其限速酶(血红素氧合酶-1)对局灶性缺血脑组织血脑屏障通透性的影响。方法:将SD大鼠随机分为3组(n=6),使用血红素氧合酶诱导剂及抑制剂腹腔注射,用等量生理盐水腹腔注射作为对照组,12h后复制MCAO模型。梗塞后24h后检测血液中一氧化碳浓度、血脑屏障通透性。结果:诱导剂组一氧化碳浓度明显高于对照组(P＜0.01),血脑屏障通透性明显低于对照组(P＜0.05),而抑制剂组一氧化碳浓度明显低于对照组(P＜0.01),血脑屏障通透性明显高于对照组(P＜0.05)。血红素氧合酶诱导剂、抑制剂对非梗塞侧的血脑屏障通透性没有影响(P＞0.05)。结论:一氧化碳作为一种信使分子,脑缺血时浓度升高具有保护血脑屏障的作用。     

Association of DAAO with schizophrenia in the Chinese population

Recently, the gene called DAAO was reported to be associated with schizophrenia in the French Canadian populations. Here, we report a result obtained in the study of our large collection of 547 schizophrenia cases and 536 controls in the Chinese population. Six single-nucleotide polymorphisms (SNPs) were genotyped at and around the DAAO locus, covering a 10-kb region entirely encompassing the complementary DNA sequences of DAAO. We found statistically significant differences in allele distributions on one marker: SNP rs3741775 (P = 0.0000001). In the haplotype analysis based on the information of linkage-disequilibrium block across this gene locus, we demonstrated a highly significant association between schizophrenia and a DAAO haplotype (P = 2.0173 x 10(-21)), which therefore provides an independent statistical support for association of the DAAO gene with schizophrenia and indicates that the DAAO gene may play a significant role in the etiology of schizophrenia in the Han Chinese.     

兔急性胰腺炎并发十二指肠粘膜损伤与一氧化氮合酶改变的关系

目的:探讨急性胰腺炎并发十二指肠粘膜损伤与一氧化氮合酶(nitric oxide synthase,NOS)改变的关系。方法:用胰管结扎及加压注射法建立大白兔急性胰腺炎模型,采用黄递酶组织化学染色法观察与比较两组动物胰腺及十二指肠组中NOS的变化。结果:经Winslow法测定血清淀粉酶分析及组织学检查,急性胰腺炎模型建立;经NADPH-d染色表明:实验组NOS染色强度明显高于对照组。结论:一氧化氮(nitric cxide,NO)在急性胰腺炎并发十二指肠粘膜损伤的病变过程中起重要的介导作用。     

Linkage Disequilibrium and Haplotype Architecture for two ABC Transporter Genes (ABCC1 and ABCG2) in Chinese Population: Implications for Pharmacogenomic Association Studies

Information about linkage disequilibrium (LD) patterns and haplotype structures for candidate genes is instructive for the design and analysis of genetic association studies for complex diseases and drug response. ABCC1 and ABCG2 are genes coding for two multidrug resistance (MDR) associated transporters; they are also related to some pathophysiological traits. To pinpoint the LD profiles of these MDR genes in Chinese, we systemically screened 27 unrelated individuals for single nucleotide polymorphisms (SNPs) in the coding and regulatory regions of these genes, and thereby characterized their haplotype structures. Despite marked variations in haplotype diversity, LD pattern and intragenic recombination intensity between the two genes, both loci could be partitioned into several LD blocks, in which a modest number of haplotypes accounted for a high fraction of the sampled chromosomes. We concluded that each locus has its own genomic LD profile, but that they still share a common segmental LD architecture with low haplotype diversity. Our data will benefit genetic association studies of complex traits and drug response possibly related to these genes.     

Induction of a cytotoxic T cell response by co-injection of a T helper peptide and a cytotoxic T lymphocyte peptide in incomplete Freund's adjuvant (IFA): Further enhancement by pre-injection of IFA alone

We have previously demonstrated that it is possible to induce a consistent and strong cytolytic T lymphocyte (CTL) response to synthetic peptides, corresponding to poorly immunogenic malaria CTL epitopes, by co-injecting them with peptides representing defined T helper (Th) epitopes in incomplete Freund's adjuvant (IFA). In this study we have tested different immunization protocols to improve further the elicitation of the CTL response. We show that the CTL response to a mixture of Th + CTL peptides administered in IFA was further enhanced by a previous injection of the Th epitope peptide in IFA. Moreover, we found that the response could be significantly augmented by a pre-injection of IFA alone. This enhancement was observed only if the Th epitope was also present in the second injection. The number of lymph node cells recovered was 2–3-fold higher in mice pre-injected with IFA, but the increase in specific CTL activity, expressed as lytic units per animal, by pre-injection of IFA was at least 10–20-fold. Thus, pre-injection of IFA clearly increases the magnitude of a subsequent CTL response.     

慢性肾小球肾炎病人白细胞糖皮质激素受体的变化

以氚标记的地塞米松(~3H-Dex)为配体,用一点分析法测定了23例慢性肾小球肾炎病人混合白细胞的糖皮质激素受体(GCR),平均为8825±2429位点/细胞((?)±SD)。与正常人5154±1635位点/细胞相比相差十分显著,P<0.01。其中16例并发尿毒症患者的GCR平均为9464±2571位点/细胞((?)±SD)。对这种变化的可能机制和临床意义进行了讨论。