人可溶性DC-SIGN的原核表达及鉴定

目的构建可溶性DC-SIGN（sDC-SIGN）原核表达载体,获得不含标签蛋白的sDC-SIGN蛋白。方法采用PCR方法,从含人DC-SIGNcDNA的重组质粒pGM-DC-SIGN扩增DC-SIGN胞外区基因片段,插入原核表达载体pET17b,构建重组表达载体pET17b-sDC-SIGN,经酶切图谱和测序鉴定,转入E.coliBL21（DE3）诱导表达蛋白,用抗人DC-SIGN抗体-Sepharose4B亲和层系纯化表达产物,以SDS-PAGE和Westernblot鉴定。结果从重组质粒pGM-DC-SIGN扩增获得1300bp目的基因片段,构建重组表达质粒pET17b-sDC-SIGN,其酶切图谱和序列与预期相符。纯化表达产物sDC-SIGN,鉴定其分子质量为38000,Westernbolt证明其可与抗人DC-SIGN抗体特异性结合。结论获得了能高效表达重组人sDC-SIGN的大肠杆菌菌株和不带任何标签蛋白的sDC-SIGN蛋白,为深入研究sDC-SIGN的功能奠定了基础。     

Effects of transmembrane region variability on cell surface expression and allorecognition of HLA-DP3

The functional relevance of polymorphisms outside the peptide binding groove of HLA molecules is poorly understood. Here we have addressed this issue by studying HLA-DP3, a common antigen relevant for functional matching algorithms of unrelated hematopoietic stem cell transplantation (HSCT) encoded by two transmembrane (TM) region variants, DPB1^*03:01 and DPB1^*104:01. The two HLA-DP3 variants were found at a overall allelic frequency of 10.4% in 201 volunteer stem cell donors, at a ratio of 4.2:1. No significant differences were observed in cell surface expression levels of the two variants on B lymphoblastoid cell lines (BLCL), primary B cells or monocytes. Three different alloreactive T cell lines or clones showed similar levels of activation marker CD107a and/or CD137 upregulation in response to HLA-DP3 encoded by DPB1^*03:01 and DPB1^*104:01, either endogenously on BLCL or after lentiveral-vector mediated transfer into the same cellular background. These data provide, for the first time, direct evidence for a limited functional role of a TM region polymorphism on expression and allorecognition of HLA-DP3 and are compatible with the notion that the two variants can be considered as a single functional entity for unrelated stem cell donor selection.     

Nitric oxide donors offer protection to RBC from storage lesion

BackgroundRed blood cell (RBC), which is the most commonly transfused blood component, due to its ability to save a life in absence of any other blood components, can be stored up to maximum 6 weeks by following standard preservation procedure. During storage, RBC undergoes various biophysical and biochemical changes (commonly known as storage lesion) for which blood transfusion with “old RBC” shows a lot of clinical problems especially relevant to critically ill patients. Recent research on S-nitrosylation of haemoglobin to improve oxygen delivery of banked blood revealed the important role of nitric oxide (NO) in protecting storage lesion.Materials and methodsIn the present study, we used various “NO donating” chemicals with different NO release dynamics and chemistries in RBC storage cocktails to test the effects of NO on storage lesion. Changes in different storage markers were evaluated after 7 days storage of pre-treated RBC.ResultsAll the NO donors have shown protection against hemolysis. However, S-nitroso glutathione (GSNO) ranks first in shielding RBCs from storage lesion and additionally, it helps in elevating the value of 2, 3-di phosphoglycerate (2, 3-DPG), improving the RBC membrane fluidity and decreasing the adhesion towards endothelial monolayer.DiscussionPresent study reveals that NO released from NO donors confers protection against storage lesions of the RBC. Further, the study confirms that pre-treatment with GSNO, a NO donor and a nitrosylating agent, ensures the best protection to RBC during low temperature storage, when compared to other NO donor treatments.     

中国儿童Brown注意缺陷障碍量表与Conners家长量表的相关性

目的：探讨Brown注意缺陷障碍量表（BADDS）家长问卷与Conners家长评定量表（CPRS）在评价我国8～12岁儿童注意障碍和多动行为等问题时的相关性。方法：对北京市西城区某小学146例8～12岁儿童分别进行BADDS家长问卷和CPRS的评定，运用Pearson相关系数进行相关性检验分析。结果：BADDS家长问卷的综合1评分与综合2评分与CPRS多动指数具有较好的相关性（r=0．739，0．771 Pa〈0．001）；BADDS各组与CPRS因子Ⅰ、Ⅱ、Ⅳ和多动指数相关性较好（r=0．523～0．788 Pa〈0．001）；与CPRS因子Ⅲ（心身障碍）和Ⅴ（焦虑）相关性较差（r=0．139～0．418）。结论：BADDS家长问卷与CPRS在评价我国8～12岁儿童的注意障碍和多动冲动行为具有较好一致性。BADDS对中国儿童注意缺陷多动障碍的评估可能是适用的。     

腰曲对颈曲影响的动态下X线片研究

目的:研究腰曲对颈曲的影响,探讨颈椎病和颈腰综合征在脊柱解剖生理学与运动力学的病因病理。方法:选青春期健康青年男女27例,分别以站立位及坐位1h后摄腰椎、颈椎标准侧位片,并应用数学几何学弓形面积计算法测量其颈、腰曲站、坐前后X线片的弓形面积,进行对照。结果:端坐1h后,颈、腰椎侧位X线片,腰曲弓形面积平均较站立位缩小53.14%,颈曲弓形面积也缩小48.33%,经统计学处理P<0.05,差别显著。结论:(1)腰曲变化影响到颈曲,病理改变与久坐有关。(2)腰曲改变是颈椎病、颈腰综合征重要病因和病理改变。     

IgM antibody response to antigens prepared from vegetative and coccoid forms of Helicobacter pylori

This report describes the utility of antigens prepared from different coccoid and spiral forms of Helicobacter pylori in a serological method. The presence of IgM antibody to H. pylori was determined in 22 human sera on antigens prepared from 24 strains of H. pylori. Antigens prepared from spiral form of certain strains of H. pylori detected IgM in all confirmed positive sera. Antigens obtained from the coccoid cells of the same strains could not completely detect IgM in the same sera. Testing sera on boosted antigens of the coccoid cells showed reduction in the number of false negative, indicating that the coccoid cells do not have one or more antigenic fractions essential for accurate detection of antibody. Our data suggest that H. pylori may lose CagA during the coccoid conversion process and regain it in the spiral form. In conclusion, we suggest that the antigen used for the detection of antibodies to H. pylori in serological methods should contain a broad spectrum of antigenic fractions and should be prepared from certain strains and culturable cells of H. pylori.     

Plasma linoleic acid partially mediates the association of bipolar disorder on self-reported mental health scales

We have shown that bipolar individuals have reduced quality diets, including lower intake of polyunsaturated fatty acids (PUFA). We have also reported reduced plasma levels of the n-6 PUFA, linoleic acid (LA), and the n-3 PUFA, eicosapentaenoic acid (EPA) in bipolar subjects. In the current analysis we hypothesized that LA and EPA plasma levels would mediate lower self-reported mental health and life functioning scores in bipolar subjects. In a cross-sectional study, we collected a 7-day diet record in bipolar (n = 56) and control subjects (n = 46) followed by a fasted blood draw. We used structured equation modeling path analysis to test for mediating effects of dietary intake and plasma levels of LA and EPA on self-reported mental health questionnaire scores, including the Life Functioning Questionnaire (LFQ), the Patient Health Questionnaire (PHQ9), and the Short Form Health Survey (SF12), extracting the mental health component summary score (SF12-MH). We adjusted for age, gender, psychiatric medication use, body mass index (BMI), and total caloric intake as covariates with bipolar disorder as the primary predictor. We found a significant path association from bipolar disorder to lower plasma LA levels (p = 0.03) and significant paths from plasma LA to PHQ9 (p = 0.05), LFQ (p = 0.01) and SF12-MH (p = 0.05) scores, such that lower plasma LA predicted worse outcomes. We found no significant paths from plasma EPA levels to any of the outcome measures. These findings suggest that plasma LA levels partially mediate the effect of bipolar disorder on self-reported measures of mental health and life functioning.     

Microsurgical management of cerebral parenchymal cysticercosis

Objective

Microsurgery is an optional way to treat parenchymal neurocysticercosis. The aim of this study is to evaluate the therapeutic efficacy of microsurgery in cerebral parenchymal cysticercosis.

Materials and methods

A retrospective analysis was performed of the clinical data and outcomes of microsurgery in 20 cases of cerebral parenchymal cysticercosis.

Results

All head segments found in cysticercus cysts were removed completely. Total resection of the cystic wall was achieved in 16 cases and subtotal resection in 4 cases. Twelve patients recovered from intracranial hypertension soon after the operation. No novel complications or deaths occurred postoperatively. The patients were followed up for 3 months to 10 years; among them, 14 patients who had epilepsy before surgery were markedly improved and controlled, 4 of 5 patients recovered from hemiparesis within 6 months after surgery, and 2 patients with cerebellar ataxia showed improvement. Two patients were lost to follow-up.

Conclusions

Despite a high rate of misdiagnosis of cerebral parenchymal cysticercosis, microsurgery is associated with satisfactory clinical outcomes in appropriately selected patients.     

一例极重度骨髓型急性放射病的临床救治

目的通过对山东济宁“10．21”^60Co源辐射事故病例B的诊治经过的回顾，积累资料，总结经验。方法剂量估算采用染色体畸变及微核分析、物理模拟、电子自旋共振（ESR）测量并结合尸检病理。临床诊断根据受照剂量、临床过程及实验室结果进行综合分析。治疗上给予全环境保护，HLA相合的异基因外周血造血干细胞移植（PBSCT），积极抗感染及对症支持洽疗，维护脏器功能。结果病例B诊断为极重度骨髓型急性放射病，受照后7d进行了HLA完全相合的PBSCT，移植后9d三系造血逐步恢复，并获持续稳定的完全供者型植入，无移植排斥及移植物抗宿主病（GVHD）发生。由于病人的放射损伤继续发展，并逐渐发生严重肺部混合感染，心功能不全，照后45d行气管切开、呼吸机辅助呼吸，75d发生多脏器功能衰竭死亡。结论极重度骨髓型放射病应尽早分类诊断及实施全环境保护，可经异基因PBSCT使造血重建，为延长存活奠定基础。需加强抗感染及多脏器维护；促进免疫重建及组织损伤修复是今后极重度骨髓型急性放射损伤研究的难点及重点。     

脑动静脉畸形供血方式与栓塞的关系研究

目的探讨脑动静脉畸形供血方式与栓塞的关系。方法回顾性分析12 4例4 0 0次超选择性微导管造影所显示的脑动静脉畸形的供血方式及其栓塞后并发症的发生率。结果4 0 0次微导管超选择性造影显示终末型供血方式2 92次,占73% ,穿枝型供血方式2 8次,占7% ,动静脉直接交通型36次,占9%。畸形血管团内伴有动脉瘤2 4例,占6 %。畸形血管团内含有静脉瘤或引流静脉呈瘤样扩张者2 0例,占5 %。除穿枝型供血方式16例未行栓塞外,余者栓塞后无严重并发症发生。结论了解脑动静脉畸形供血方式便可知道能否安全的进行栓塞,而测定脑动静脉畸形的动静脉循环时间可指导栓塞用胶的配制浓度。