HIV-1感染者外周血单个核细胞缺损病毒基因的研究

目的:研究HIV-1感染者缺损HIV-1 DNA的特性.方法:用长片段PCR法(LD-PCR)研究分析HIV-1感染者外周血单个核细胞(peripheral blood mononuclear, PBMCs)和体外培养感染淋巴细胞中HIV-1基因特征,使用位于HIV-1 DNA链两端的LTR(U5)、LTR(R)为引物,插入有全长HIV-1基因片段的大肠杆菌质粒PNL4-3等为标准对照,并对部分标本克隆测序.结果:经扩增9.1 kb是LD-PCR的主要产物,但在10例HIV-1感染者中有9例PBMCs检测出大小不一、范围较广的缺失HIV-1基因片段,经用基因探针杂交,发现近HIV-1基因中心部位缺失频率增加,缺失结合点常存在3～4个核苷酸短片段直接重复,体外培养中HIV-1基因缺损量减少,完整和缺失基因的存在与培养中病毒分离的时间密切相关.结论:HIV-1感染者PBMCs中存在大量HIV-1基因重组和缺损片段.     

Plasma α1-antitrypsin: A Neglected Predictor of Angiographic Severity in Patients with Stable Angina Pectoris

Background:

As an acute phase protein, α1-antitrypsin (AAT) has been extensively studied in acute coronary syndrome, but it is unclear whether a relationship exists between AAT and stable angina pectoris (SAP). The purpose of the present study was to investigate the association between AAT plasma levels and SAP.

Methods:

Overall, 103 SAP patients diagnosed by coronary angiography and clinical manifestations and 118 control subjects matched for age and gender were enrolled in this case-control study. Plasma levels of AAT, high-sensitivity C-reactive protein (hsCRP), lipid profiles and other clinical parameters were assayed for all participants. The severity of coronary lesions was evaluated based on the Gensini score (GS) assessed by coronary angiography.

Results:

Positively correlated with the GS (r = 0.564, P < 0.001), the plasma AAT level in the SAP group was significantly higher than that in the control group (142.08 ± 19.61 mg/dl vs. 125.50 ± 19.67 mg/dl, P < 0.001). The plasma AAT level was an independent predictor for both SAP (odds ratio [OR] = 1.037, 95% confidence interval [CI]: 1.020–1.054, P < 0.001) and a high GS (OR = 1.087, 95% CI: 1.051–1.124, P < 0.001) in a multivariate logistic regression model. In the receiver operating characteristic curve analysis, plasma AAT level was found to have a larger area under the curve (AUC) for predicting a high GS (AUC = 0.858, 95% CI: 0.788–0.929, P < 0.001) than that of hsCRP (AUC = 0.665, 95% CI: 0.557–0.773, P = 0.006; Z = 2.9363, P < 0.001), with an optimal cut-off value of 137.85 mg/dl (sensitivity: 94.3%, specificity: 68.2%).

Conclusions:

Plasma AAT levels correlate with both the presence and severity of coronary stenosis in patients with SAP, suggesting that it could be a potential predictive marker of severe stenosis in SAP patients.     

Design,synthesis and biological evaluation of B-region modified diarylalkyl amide analogues as novel TRPV1 antagonists

Design, synthesis and biological evaluation of B-region, known to be a dipolar interacting pharmacophore, modified diarylalkyl amide analogues for novel TRPV1 (transient receptor potential channel, vanilloid subfamily member 1) antagonists was described. A variety of moieties including guanidines, heterocyclic rings, cinnamides, and α-substituted acetamides were introduced at the B-region. TRPV1 antagonistic activities of these analogues were evaluated by ⁴⁵Ca²⁺ uptake assay in rat DRG neuron. In particular, α,α-difluoroamide 53 exhibited 3-fold more potent TRPV1 antagonistic activity (IC₅₀ = 0.058 μM) than the parent amide analogue 6.     

特殊作业环境下海军军人情绪状态调查

目的: 了解海军特殊作业环境军人情绪状态. 方法: 从6种不同工作性质海军部队抽取1000名军人作为调查对象,获得有效问卷962份. 采用症状自评量表(SCL-90)对被试进行评定,并分别与中国人群常模和中国军人常模进行比较. 结果: 特殊作业环境下海军军人SCL-90总均分及各因子分均高于中国地方人群常模(P<0.01)和中国军人常模(P<0.01);不同作业环境下军人SCL-90总均分及各因子分与中国军人常模相比存在显著性差异(P<0.05). 结论: 特殊作业环境对海军军人情绪有一定影响.     

阴道毛滴虫Rab6鸟苷三磷酸酶同源基因的cDNA克隆和序列分析

Rab鸟苷三磷酸酶是细胞膜转运机制的关键调节分子,与原虫的分泌功能密切相关。本研究旨在克隆和分析阴道毛滴虫Rab6鸟苷三磷酸酶同源基因,以便进一步探讨其功能。作者从阴道毛滴虫cDNA表达文库中分离出2个Rab6鸟苷三磷酸酶同源基因的cDNA克隆,其中1个cDNA序列长658对碱基,读码框含597对碱基,推测蛋白质序列具198个氨基酸。序列分析表明该氨基酸序列与Rab6a蛋白亚家族的同源性最高。另一cDNA序列长764对碱基,读码框含657对碱基,推测蛋白质序列具218个氨基酸。序列比对分析显示该氨基酸序列与Rab6b蛋白有较高的同源性。2个氨基酸序列都拥有Rab鸟苷三磷酸酶家族的所有保守结构域、特异性RabF结构域和典型的异戊烯化结构域。进化树分析提示毛滴虫的这2个基因系Rab6家族的同源基因,在进化上更接近原虫和单细胞的酵母Rab6亚家族。序列分析还显示这2个基因都无内含子,其基因组DNA序列与其cDNA序列完全一致。     

基于体素的MRI形态学测量对遗忘型轻度认知障碍和轻度阿尔茨海默病脑灰质萎缩的研究

目的：利用磁共振3DT1WI成像研究遗忘型轻度认知障碍（aMCI）、轻度阿尔茨海默病（AD）患者相对于正常老年人灰质体积改变的特点。方法：采用3．0T磁共振,对33例aMCI患者（aMCI组）、32例轻度AD患者（轻度AD组）及31名正常老年人（对照组）进行3DT1WI扫描,利用基于SPM5的DARTEL工具箱对扫描获得的结构图像进行预处理,再对aMCI组、轻度AD组和对照组的全脑灰质体积进行基于体素的统计学比较。结果：与对照组比较,aMCI组左侧海马、海马旁回、舌回、颞上回,双侧岛叶和颞中回等结构的灰质体积萎缩,其差异有显著统计学意义（P〈0．01,FDR corrected,K〉50体素）。轻度AD组的双侧海马、海马旁回及杏仁核、双侧丘脑、双侧颞顶叶皮质等结构灰质体积萎缩,额叶和枕叶皮质也出现灰质萎缩,其差异也有统计学意义（P〈0．05,FDR corrected,K≥50体素）。结论：基于体素的MRI形态学测量能够客观揭示AD早期阶段的脑灰质萎缩改变,对左侧海马萎缩的识别有助于AD的早期诊断。     

中国汉族人群17个心血管疾病易感基因位点基因型和基因频率分析

目的:调查中国汉族人群中17个心血管疾病易感基因位点的基因型和基因频率.方法: 运用基因芯片技术同时检测138例来自中国大部分省市的汉族人的13个心血管易感基因的17个SNPs.结果: 国内未曾见报道的4个基因位点基因型频率分别为: ET-2985 AA∶AG∶GG为2.2% (3)∶22.2% (30)∶75.6% (102);NPRC(-55) AA∶AC∶CC为8.1% (11)∶23.0% (31)∶68.9% (93);KCNQ1140则只发现了SS基因型;CYP46rs754203 CC∶CT∶TT为55.0%(66)∶20.0%(24)∶25.0%(30).ApoBMsp1 ∶-为92%(232)∶8%(20),而Hapmap公布的则为100%(90)∶0%(0),两者比较,差异有统计学意义(χ2=7.587,P=0.000).MTHFR677 C∶T为70%(168)∶30%(72),与Hapmap中中国北京汉族人(CHB)公布的结果48.9%(44)∶51.1%(46),以及ALFRED中公布的中国香港汉族(SA0008510)77.8%(322)∶22.2%(92)比较,差异具有统计学意义(χ2和P分别为12.70,0.000;4.89, 0.027).其他位点的调查结果与Hapmap计划中CHB(ANP2238, ApoBXbaⅠ, NOS3298, ApoBEcorⅠ和ApoE112)和ALFRED网站的SA0008510的基因频率(AGT235, ACEAlu, ApoCⅢ3175, ApoCⅢ3206, ApoE158和SerpinA3rs4934)有较好的吻合.结论:SNPs频率分布具有种族和地区差异,中国汉族人群中ANP2238 C, ApoBEcorⅠ(-)和KCNQ1140 G, 是少见的等位基因(《5%),可能不是心血管疾病的主要原因.用基因芯片检测多个心血管疾病易感基因SNPs结果可靠.