WT1基因与急性髓系白血病的预后及主动特异性免疫治疗的研究进展

WT1基因位于人类染色体11p13，在80%的急性髓系白血病（acute myeloid leukemia，AML）患者中高表达，是AML预后不良的分子标志，可作为AML预后评估和微小残留病变（minimal residual disease，MRD）监测的有效指标。由于WT1在AML中均有异常高表达，故认为是一种AML抗原，可作为特异性免疫治疗的新靶点。一些小规模的临床试验证实以WT1为靶点的免疫治疗是有效的、安全的，这些免疫治疗可作为那些有高危复发风险及初始标准化疗失败的AML患者的辅助治疗。本文就近几年WT1与AML的预后及有关以WT1为靶点的主动特异性免疫治疗的研究进展予以综述。     

改进的小波域医学图像序列的运动估计

医学图像序列压缩是远程医疗系统中的重要技术，而运动估计在视频序列压缩中起着关键作用。我们提出了一种改进的正方形-菱形搜索算法来实现医学图像序列的运动估计。这种改进的正方形-菱形算法减少了搜索点数。我们将其应用于小波域的医学图像序列的运动估计，并对数字减影血管造影图像序列（DSA）进行实验。结果表明，改进后的小波域正方形-菱形算法较其他算法精度高。     

Engulfment of mast cell secretory granules on skin inflammation boosts dendritic cell migration and priming efficiency

1. Download : Download high-res image (228KB)
2. Download : Download full-size image

     

基于离散小波变换提取脑机接口中脑电特征

在脑机接口中，针对脑电特征提取利用单一种类信息、使用数据量大、分类性能较差等缺点，提出一种新颖的基于离散小波变换的方法。分析了小波变换特征提取的特点和特征表示方式，用Daubechies类db4小波函数对脑电信号进行6层分解，抽取小波变换各子带关键的部分逼近系数、小波系数、小波子带系数均值组成特征向量。以分类正确率为指标检验了提取特征的性能。实验结果表明，这种方法能够利用少量数据提取脑电信号本质特征，具有较高的分类性能，为利用脑电识别人的不同意图提供了快速而有效的手段。     

Mucosal bromodomain-containing protein 4 mediates aeroallergen-induced inflammation and remodeling

1. Download high-res image (248KB)
2. Download full-size image

     

HLA-DR residues accessible under the peptide-binding groove contribute to polymorphic antibody epitopes

Many residues involved in polymorphic antibody-binding epitopes on class II molecules are located on the -helix of DRβ chains. Although they have received less attention, residues in the peptide-binding groove and second domain of the DRβ chain may also be critical for polymorphic anti-DR antibody epitopes. In this study, we used transfectants expressing site-directed mutations at positions in the HLA-DR β₁ and β₂ domains and flow cytometry to define the epitopes of several polymorphic anti-DR antibodies. Both DR(β 1^*0403) residues 14 and 25 were shown to be involved in the epitopes of mAbs DA6. 164, HU-20, Q5/6, and 50D6, and DR(β 1^*0701) residue 14 was shown to be critical for the epitopes of two DR7-specific mAbs, SFR16-DR7M and TAL 13. 1. Unlike most other residues shown to be important in antibody-binding epitopes, residue 14 is located in the floor of the peptide-binding groove and residue 25 is in an outer loop, each with their side chains pointing down, such that antibodies may directly contact these residues from below the binding groove. Two residues in the β₂ domain, β180 and β181, were also shown to be involved in the epitopes of three polymorphic anti-DR mAbs, NFLD.D1, NFLD.M1, and LY9. Although these two residues are close to the transmembrane domain in the linear sequence, their solvent accessibility in the DR1 structures is quite impressive. Our data provide new evidence that residues accessible under the peptidebinding groove contribute to polymorphic antibody-binding epitopes.     

The dysregulated glomerular cell growth in Denys–Drash syndrome

While diffuse mesangial sclerosis is traditionally described as being the glomerulopathy of Denys–Drash syndrome (DDS), the podocyte proliferative lesions may be overlooked in these DDS cases. In the present study, an evolving process is extrapolated from a selected case of DDS that demonstrated glomerulopathy with conspicuous podocyte proliferation. The observation that podocytes express proliferation markers (Ki67, proliferating-cell nuclear antigen and topoisomerase II) in non-proliferative, mature-looking glomeruli suggests an initial pathogenic act to activate or to keep podocytes from quiescence. The subsequent proliferation of podocytes is in keeping with downregulation of WT1 and cyclin kinase inhibitors of p16 and p21. The emergence of cytokeratin-positive cells in glomeruli that show typical mesangial sclerosis implies elimination of podocytes and replacement with tubular and/or parietal epithelial cells. The final scene of evolving glomerulopathy displays apoptosis and expression of Fas-L and Bax in sclerotic mesangial lesions, which eventually end up with global sclerosis. This novel concept of DDS glomerulopathy implies complex molecular mechanisms involved in glomerular injury.     

子宫腺肌病误诊原因分析及术前诊断临床探讨

目的;探讨子宫腺肌病误诊原因及近年术前诊断研究进展,方法;对我院近１０年收治的１９７例腺肌病患者的临床资料进行回顾性分析。结果：１９９０年元月至１９９７年１２月１２８例腺肌病患者术前,术后诊断符合率仅为２９．７％,术后误诊,漏诊率达７０．３％,１９９８年元月至１９９９年１２月６９例术前经测定血清ＣＡ１２５及 腔双氧水造影后误诊,漏诊率降为２７．５％术前主要误诊为子宫肌瘤或（和）子宫内膜异位症,结论     

糖尿病尿五种微量蛋白检测评估早期肾损害

目的：探讨尿五种微量蛋白测定在糖尿病肾病（ＤＮ）早期诊断中的诊断价值。方法：采用放射免疫分析法（ＲＩＡ）检测３０例正常人及９８例非胰岛素依赖性糖尿病（ＮＩＤＤＭ）患者尿液;α１－微球蛋白（α－ＭＧ）,β２－微球蛋白（β２－ＭＧ）Ｔａｍｍ－Ｈｏｒｓｆａｌｌ蛋白（ＴＨＰ）,白蛋白（ＡＬｂ）及免疫球蛋白Ｇ（ＩｇＧ）含量。结果：随着ＣＣｒ值的下降,尿α１－ＭＧ,β２－ＭＧ,ＡＬｂ及ＩｇＧ排泄量逐渐增高,而     

危重病人心律失常与血清钾水平关系的临床研究

目的：分析心律失常与血清钾的关系,探讨有效的防治措施。方法：将４５６例心律失常患者按血清钾分为轻,中,重及正常４组,分别观察血钾与滨。结果：轻度低血钾１４例（３１％）,中度低血钾１６例（３６％）,重度低血钾７例（１５％）,正常血钾８例（１８％）。血钾与心律失常类型无明显差异。结论：患者心律失常与血清钾水平关系密切,但由于影响血清钾水平的因素较多,在血清钾水平正常的情况下,不能忽视。