肌萎灵注射液对大鼠原代培养运动神经元生长的影响

为了观察中药制剂肌萎灵注射液对大鼠原代培养脊髓运动神经元生长的影响,本研究采用MTT方法观察神经元活力,并通过免疫组织化学技术进行NF 200染色后图像分析测定突起长度。结果表明:浓度为0. 5% ~5%的肌萎灵注射液能增加培养神经元活力,浓度为0. 5% ~1%的肌萎灵能促进神经元突起生长。本研究结果提示:肌萎灵注射液对培养的大鼠脊髓运动神经元生长有促进作用。     

Genetic imbalances in pleomorphic xanthoastrocytoma detected by comparative genomic hybridization and literature review.

Pleomorphic xanthoastrocytoma (PXA) is a rare, low-grade astrocytic tumor found in the central nervous system. Histologically, the tumor is characterized by markedly pleomorphic and lipidized cells. Although most of the patients have a favorable prognosis, a small number of cases undergoing recurrence or progression to anaplastic astrocytoma were reported. Very few genetic studies have been performed on PXA because of its rarity and the pathogenesis of this neoplasm is largely unknown. In order to provide an overview of genetic alterations in PXA, we performed comparative genomic hybridization to identify chromosomal imbalances (DNA gains and losses) in three cases of PXA. Genetic imbalance was detected on at least one chromosome for each case. One case, which revealed multiple genetic alterations, showed a poor prognosis. DNA gain on chromosome 7 and loss on 8p were demonstrated in two of three cases, suggesting that the candidate gene(s) located on these regions may play a role in the development of PXA. Further studies are needed to identify the residing candidate genes that are involved in the tumorigenesis of PXA. In addition, the histopathological features and previous genetic studies on PXA are reviewed.     

大Y携带者不良孕产史与胚胎非整倍体率增高的关系

目的探讨1例有不良孕产史的大Y携带者的胚胎异常情况。方法1对有2次自然流产史的夫妇,男方染色体核型为46,XY,Yqh ,常规超促排卵和卵母细胞胞浆内单精子注射,受精后第3天和第4天进行胚胎活检,获取分裂球,采用18,X,Y三色着丝粒探针进行荧光原位杂交分析(FISH),第5天移植正常胚胎。异常胚胎及废弃胚胎所有分裂球第6天再次FISH确定胚胎核型。结果患者获卵19个,对其中13个M2期卵母细胞进行ICSI,12个受精,分裂11胚。10个胚胎获得明确诊断,其中4个正常胚胎,6个异常胚胎,异常发生率达60%。5个为女胚,其中1个正常核型,4个异常胚胎中2个为无序分裂,2个为嵌合体;5个为男胚,3个正常,2个异常胚胎中1个为无序分裂,1个为嵌合体。对染色体正常的1个女胚进行宫腔内移植,未获得妊娠。结论该例大Y患者胚胎非整倍体发生率增高可能是导致其不良孕产史的原因。     

急性心肌缺血的动态关联维数

已有的研究成果表明，冠心病患者心脏各导联心电图(ECG)的关联维数D2比正常人均有不同程度的下降。为了进一步研究心肌缺血情况、导联位置和关联维数变化的关系，本研究设计了6只兔子急性心肌缺血实验模型，计算了其不同时间段的12导同步ECG，作出关联维数一时间(D2-T)曲线，结合电生理和解剖学知识，研究了实验结果，发现急性心肌缺血初期ECG的D2值具有动态变化特性，其原因在于心血管中存在代偿作用。ECG的D1的变化反映了单一化的心脏传输网络系统的非线性复杂性的变化。将此结论由动物推广到人，可以为临床上运用D2值分析心肌缺血病症严重程度提供理论指导。     

Relative contributions of innate and acquired host responses to bacterial control and arthritis development in Lyme disease

TLR2(-/-)/scid double-mutant mice were infected with B. burgdorferi to assess the relative importance of acquired and innate host defenses. Although spirochete levels at 4 weeks were lower in TLR2(-/-) mice than in TLR2(-/-)/scid mice, the increased arthritis severity of TLR2 (Toll-like receptor 2)-deficient mice was reduced by the presence of the scid mutation.     

大鼠胸腺降黑素受体的鉴定及生物学特性

应用放射配体结合法证实大鼠胸腺内存在降黑素特异结合部位，该结合位点可以满足特异结合部位的基本条件：１．低结合容量；２．高亲和力；３．可饱和性；４．可逆性；５．对降黑素高度特异性。此外，该特异结合位点具昼夜节律；亚细胞分布的研究表明以细胞核含量最高，线粒体次之，并具有年龄依赖性降低，以出生时最高。     

乌鲁木齐市维吾尔族长寿家族成员第二掌骨骨皮质的X线形态学测量分析

用Ｘ线形态学测量方法，对乌鲁木齐部分维吾尔族长寿老人及其家族成员的第二掌骨骨皮质进行了测量。结果表明１０￣３９岁组骨皮质厚度，皮质厚度指数，皮质面积随年龄增长而增大，３０￣３９岁组达到峰值，其中骨皮质厚度、皮质面积的数值男性〉女性，３０￣３９岁组差别有显著性。４０岁以后各组数值开始下降，其下降速度女性快于男性，９０岁以上组最为明显，有显著性差异。     

84例周围血管病的足甲襞微循环观察

对84例周围血管病(脉管炎68例,静脉炎16例)和25例正常健康人进行了足甲襞微循环的对比观察。结果:患病组足甲襞微循环的血管形态、流态、管周状态均较正常健康组有明显差异(P<0.01)。提示:更接近病变部位的局部微循环观察更能代表病变的程度,对临床医生判断病情、选择用药和疗效观察都有很大帮助和参考价值。     

小鼠甲胎蛋白与结核杆菌热休克蛋白70基因融合载体的构建及体外表达

目的 构建小鼠甲胎蛋白(α-Fetoprotein，AFP)与结核杆菌热休克蛋白70(Mycobacterium tuberculosis heat shock protein 70，Mt．HSP70)基因融合载体．并研究其在真核细胞中的表达情况。方法 以pcDNA3.1为基本单位构建AFP及HSP70的融合表达载体，融合基因以G-S-G-G-S连接子连接；用脂质体将系列载体导入COS-7细胞．48h后以免疫化学方法检测其表达。结果 构建的AFP和HSP70的单独及融合表达载体导入COS-7细胞48h后经RT-PCR检测可扩增出相应片段，细胞免疫化学染色为阳性。结论 AFP和HSP70的单独及融合表达载体构建成功，并能在真核细胞中表达。     

High density of immobilized galactose ligand enhances hepatocyte attachment and function

Galactosylated surface is an attractive substrate for hepatocyte culture because of the specific interaction between the galactose ligand and the asialoglycoprotein receptor on hepatocytes. In this study, we described a scheme to achieve high density of immobilized galactose ligands on polyethylene terephthalate (PET) surface by first surface-grafting polyacrylic acid on plasma-pretreated PET film under UV irradiation, followed by conjugation of a galactose derivative (1-O-(6'-aminohexyl)-D-galactopyranoside) to the grafted polyacrylic acid chains. A high galactose density of 513 nmol/cm(2) on the PET surface was used in this study to investigate the behavior of cultured hepatocyte. This engineered substrate showed high affinity to fluorescein isothiocyanate-lectin binding. Primary rat hepatocytes, when seeded at a density of 2 x 10(5) cells/cm(2), attached to the galactosylated PET substrate at a similar efficiency compared with collagen-coated substrate. The hepatocytes spontaneously formed aggregates 1 day after cell seeding and showed better maintenance of albumin secretion and urea synthesis functions than those cultured on collagen-coated surface.