人前磨牙牙髓牙本质复合体层粘连蛋白的免疫组织化学研究

目的　研究层粘连蛋白在牙髓牙本质复合体内的表达 ,探讨其分布与功能的关系。　方法　收集不同年龄新鲜健康人前磨牙 6 0颗 ,固定 ,脱钙 ,石蜡包埋 ,层粘连蛋白免疫组织化学染色。　结果　层粘连蛋白免疫反应性 ( IR)普遍存在于牙髓、前期牙本质和成熟牙本质小管与成牙本质细胞突起之间 ,以牙髓的神经与血管周围最为丰富 ,冠髓较根髓密集。　结论　层粘连蛋白 IR不仅见于牙髓与前期牙本质 ,而且也见于成熟牙本质 ,它对支持、固定牙髓牙本质复合体各结构的正常位置、形态可能发挥了重要作用     

Preparation of Aminated Macroporous Polyvinyl Alcohol Resins and Evaluation for Bilirubin Adsorption

In the present study we prepared macroporous polyvinyl alcohol beads. A series of bilirubin adsorbents were generated by immobilization of eight amine agents to the beads as ligands. The adsorption of bilirubin was evaluated by in vitro static and dynamic adsorption tests. The results show that these adsorbents have excellent adsorption efficiency and capacity. Among the eight ligands, trimethylamine (TMA), triethylamine (TEA) and 1,6- hexanediamine(HDA) showed the highest adsorption capacity. The adsorption equilibrium can be achieved in half an hour, and the adsorption percentage of bilirubin was up to 80%. Static electricity and hydrophobic interaction played the main role in bilirubin adsorption, and the adsorption was found to match the monolayer model. The excellent adsorption of these adsorbents indicates their potential in clinical treatment.     

补体经典激活途径C3转化酶的体外组装及活性观察

目的：体外组装包含人C4分子的补体经典激活途径C3转化酶，并对其转化酶活性及衰变特性进行观察。方法：利用豚鼠血清功能纯C1、C2及溶血中间体EAC4^hu体外组装经典途径C3转化酶，观察不同C1、C2用量及孵育温度对C3转化酶形成和自发性衰变的影响，以及人红细胞膜抽提蛋白对C3转化酶衰变化的影响。结果：高剂量和低剂量的C1均会影响C3转化酶的形成，增加C2用量可增加C3转化酶的形成数量，C3转化酶的自发性衰变随孵育温度的升高而加速，人红细胞膜抽提蛋白可抑制C3转化酶的自发性衰变过程，结论：C1、C2用量及孵育温度是影响C3转化酶形成和自发性衰变的主要因素，体外组装的补体经典激活途径C3转化酶可应用于相关补体调控蛋白的活性检测。     

组成型一氧化氮合酶的表达与胃癌的侵袭转移和预后的关系

目的　观察胃癌组织中cNOSmRNA表达分布情况 ,探讨其与胃癌侵袭转移和预后的关系。　方法　运用原位杂交技术 ,检测 119例原发性胃癌标本中cNOSmRNA的表达 ,并对所获得的 82份病例随访资料进行生存分析。　结果　胃癌组织中胃腺癌细胞、血管 淋巴管内皮细胞及巨噬细胞中均可见有cNOSmRNA表达 ;肿瘤细胞分化程度越低、恶性度越高 ,胃腺癌细胞和血管 淋巴管内皮细胞cNOSmRNA阳性表达率就越高 ;胃腺癌细胞和血管 淋巴管内皮细胞cNOSmRNA阳性表达率与胃癌侵袭深度、淋巴结转移以及TNM分期呈正相关 ;胃癌血管 淋巴管内皮细胞cNOSmRNA阳性表达者术后生存率较低 ;巨噬细胞中cNOSmRNA表达与胃癌组织学分型、侵袭深度、淋巴结转移、TNM分期及患者术后生存期无关。　结论　胃腺癌细胞和血管 淋巴管内皮细胞cNOSmRNA表达情况与肿瘤恶性程度、侵袭和转移潜能有关 ,血管 淋巴管内皮细胞上cNOSmRNA阳性表达提示患者预后不良     

散发性帕金森病患者γ-synuclein基因的研究

目的 探讨γ-synuclein基因C243G和A377T多态在散发性帕金森病(Parkinson’s disease，PD)的疾病易感性中的意义。方法 采用聚合酶链反应-限制性片段长度多态法，对上海汉族人中145例PD患者和184名正常人进行γ-synuclein基因C243G和A377T多态分型，并作与PD的遗传关联研究。结果 PD患者与正常对照间γ-synuclein基因C243G和A377T多态分布的差异无显著性，两种多态与PD亦无关联(P值均大于0．05)。结论 上海地区汉族人群中γ-synuclein基因C243G和A377T多态与散发性PD无关。     

Identification of a frequent variant in ALG6, the cause of Congenital Disorder of Glycosylation-Ic

Congenital Disorder of Glycosylation (CDG) type Ic is caused by mutations in ALG6. This gene encodes an alpha1,3 glucosyltransferase used for synthesis of the lipid linked oligosaccharide (LLO) precursor of the protein N-glycosylation pathway. CDG-Ic patients have moderate to severe psychomotor retardation, seizures, hypotonia, strabismus, and feeding difficulties. We previously identified a typical patient with a heterozygous point mutation, c.391T>C (p.Tyr131His) in ALG6. Using complementation analysis of ALG6-deficient yeast, we show that this alteration is as severe as the most common disease-causing mutation, c998C>T (p. Ala333Val), which occurs in over half of all known CDG-Ic patients. The frequency of c.391T>C (p.Tyr131His) in the US population, is 0.0214, suggesting that homozygotes would occur at a rate of& tilde;1:2,200. We identified one patient with typical CDG-Ic symptoms and a homozygous p.Tyr131His alteration in ALG6. However, in contrast to most CDG patients, her LLO and plasma transferrin glycosylation appeared normal. Thus, it is unclear whether c.391T>C causes CDG-Ic or contributes to the symptoms. Genotyping additional patients with CDG-like symptoms will be required to resolve this issue.     

Changes of interleukin expression correlate with Helicobacter pylori infection and lymph node metastases in gastric carcinoma.

Helicobacter pylori (HP) infection induces expression of IL-8 and IL-10 in benign gastric epithelium. This study compared the expression of cytokines in CD4+ and CD8+ lymphocyte subsets of peripheral blood lymphocytes (PBL), benign mucosal lymphocytes (ML), and tumor infiltrative lymphocytes (TIL) as well as in the benign and malignant epithelial cells of the same patient, with respect to the presence of HP infection, lymph node metastases, and tumor histologic type. The mRNA of the cytokines was measured by a semiquantitative RT-PCR method. The levels were ranked and compared using the Wilcoxon sign-ranked test. Compared with CD8+ ML, the CD8+ TIL expresses higher levels of IL-6 and IL-8 but lower level of IL-4 in patients with lymph node metastases. In patients with HP infection, expression of IL-8 and IL-10 was higher in the gastric carcinoma cells than in the benign epithelial cells while expression of IL-6 and IL-8 were higher in CD8+ TIL than CD8+ ML. Overexpression of IL-8 in HP associated gastric carcinomas suggested that they might have arisen from HP-infected epithelial cells.