乌蛇败毒胶囊对接触性皮炎小鼠血清IL-2、TNF-α的影响

目的探讨乌蛇败毒胶囊治疗湿疹的机理。方法采用变应性接触性皮炎小鼠模型,分为模型组,对照组及大、中、小剂量组和空白组,观察各组治疗前后血清IL-2、TNF-α的变化。结果中药组能明显降低模型小鼠血清中IL-2、TNF-α的含量(P<0.01),降低诱发后鼠耳的肿胀度,减少真皮内单一核及多形核白细胞数目(P<0.01)。结论乌蛇败毒胶囊治疗湿疹的部分机理是抑制小鼠Ⅳ型变态反应、降低血清IL-2,TNF-α含量,减轻炎症损伤。     

唇腭裂的牙槽突裂植骨修复术

牙槽突植骨术是唇腭裂序列治疗的一个组成部分,对于恢复上颌牙弓的完整性,保证上颌牙齿的正常萌出,促进上颌骨的垂直向生长及颌骨的稳定性,矫正患侧鼻底塌陷畸形及修复唇侧口鼻腔瘘均有重大意义。总结了保证手术成功的关键,并认为植骨术前后应接受正畸治疗。8～11岁 X 线片示尖牙根形成2/3为最佳手术时间。     

The characteristics of duodenal peptic ulcer in obese persons]

Analysis was made of the rate of clinical manifestations and complications in 77 patients with overweight exceeding stage I obesity, suffering from duodenal ulcer. In the overwhelming majority of the patients, the disease ran with typical complaints and the diagnosis of peptic ulcer was not difficult. In subjects prone to and suffering from obesity, duodenal ulcer accounted for 2.3% among all the patients with duodenal ulcers. The patients were noted to be fairly prone to complications, particularly to the stenosing of the duodenum. Concomitant complications occurred frequently enough (36.3%). In obese patients, nontypical "low" localization of duodenal ulcer and a high proneness to hypersecretion were encountered more frequently.     

分离和孵育大鼠黄体细胞的方法

本文介绍了用胰蛋白酶分散大鼠黄体细胞和培养的方法。未成年雌性大鼠用PMSG和hCG诱导超排卵后取得的黄体,经0.025%的胰蛋白酶分散,可获得大(直径为14.2～28.5μm)、小(直径为7.1～12.3μm)二种黄体细胞。台盼兰排斥试验测得细胞活力为85～90%,经3～4小时孵育后基本保持不变。黄体细胞产生的孕酮量与hCG浓度、培养时间和细胞数明显相关;而且,cAMP能显著增加hCG刺激的孕酮产生。结果表明,用胰蛋白酶分散大鼠黄体细胞进行体外培养是一种简单而有用的方法。     

构建肿瘤坏死因子-α免疫微球的实验研究

前瞻性构建肿瘤坏死因子-α免疫微球,以期为将来进一步研究能应用于特异性清除TNF-α的血液净化方法,奠定实验基础。采用以PSM为载体,依次包被PLL及rHTNF-αM cA b的方法而制备的免疫微球,分别以异硫氰酸荧光素标记,应用倒置显微镜及荧光显微镜观察、分光光度计测定等方法,探讨吸附微球的包被条件。结果显示,20℃、pH 9.5、60 m in三者为PLL包被PSM的最佳条件。包被后的洗脱液检测结果显示PLL含量无明显变化,说明PLL在PSM表面包被较为牢固。在相同温度及包被时间内,应用浓度为0.2%的戊二醛溶液进行的rHTNF-αM cA b对PLL的包被结合牢固。实验表明,所构建的肿瘤坏死因子-α免疫微球,达到了预期的目的,可以作为一种新颖的免疫吸附材料。该方法简单,价格便宜,为相关实验研究提供了一种崭新方法。     

Evaluation of endothelial cell migration with a novel in vitro assay system

In this study we introduce a novel in vitro 'oil-drop' assay system for the measurement of endothelial cell (EC) migration, based on the original concept of the Teflon fence assay (Pratt et al., 1984; Am. J. Pathol. 117: 349–354). An aliquot of 15–20,000 human umbilical vein EC (HUVEC) is pipetted through a layer of mineral oil. The cells readily attach, spread and migrate on the surface of a matrix-coated tissue culture dish as a confluent circular monolayer. Migration is measured as the net increase in the total area covered at 24 hours. We have used this system to quantify EC migration on matrices composed of a mixture of type I collagen and either von Willebrand factor (vWF) or fibronectin (FN) in the presence or absence of tumor necrosis factor (TNF). Plating efficiency on both vWF/collagen and FN/collagen, measured by counting cells after attachment and spreading, is about 80%. With this method, migration on vWF/collagen was about 6.4 mm² and 5.3 mm² for TNF-treated and untreated HUVEC, respectively. HUVEC migration on FN/collagen was slightly greater – 6.4 mm² and 6.5 mm² with and without TNF treatment, respectively. During the 24 hour time period, HUVEC numbers increased 30–40% on vWF/collagen, and 60–80% on FN/collagen, with increased proliferation observed with TNF- treatment. EC proliferation could be completely inhibited by 2 mM hydroxyurea. This assay system has proven useful in our studies to quantify cell migration and proliferation.     

表面磁性膜医用316L不锈钢支架的生物相容性

目的 对表面磁性膜血管内支架进行生物相容性研究,为该支架的临床应用提供实验依据.方法 通过溶血实验、动态凝血时间实验、急性全身毒性实验、皮内刺激实验、细胞毒性实验、热源实验、过敏实验、体内植入实验综合评价表面磁性膜血管内支架的生物相容性.结果 表面磁性膜血管内支架无溶血反应及凝血功能的改变,无急性全身毒性反应,无热源反应,支架材料中不存在致敏性物质;支架材料动物体内植入在初期有轻度的炎性反应,12周后炎性反应基本消失,未见炎性细胞浸润积聚现象.结论 表面磁性膜血管内支架具有良好的生物相容性,其应用于临床具有可行性和安全性.     

骨髓间质干细胞体外分化为成骨细胞的实验研究

建立猪骨髓间质干细胞 (mesenchymalstemcells ,MSCs)体外分离培养方法。对猪MSCs体外分化为成骨细胞的能力进行研究。抽取猪骨髓 ,体外培养MSCs。取第二代MSCs ,以含有不同浓度的抗坏血酸、β -磷酸甘油、地塞米松及碱性成纤维细胞生长因子等条件培养基进行成骨细胞诱导分化。通过细胞形态变化 ,碱性磷酸酶染色及钙盐沉积对成骨细胞进行鉴定。结果表明MSC细胞形态由长梭形向多边形转变 ,ALP染色阳性 ,VonKossa染色阳性 ,经体外诱导分化后呈典型的成骨细胞样改变。猪骨髓MSCs可在体外长期、稳定培养 ,具有向成骨细胞分化的潜能 ,可以为骨组织工程研究提供较理想的细胞来源和动物模型。     

Molecular cloning and characterization of a hemolysin gene from Actinobacillus (Haemophilus) pleuropneumoniae.

This article describes the molecular cloning and expression of a hemolysin gene from a serotype 1 strain of Actinobacillus pleuropneumoniae. The hemolysin was a thermolabile protein with an apparent molecular weight of 29,500 (29.5K hemolysin). Unlike expression of the recently described 105K hemolysin of A. pleuropneumoniae (J. Frey and J. Nicolet, FEMS Microbiol. Lett. 55:41-46, 1988), expression of this hemolysin was not regulated by Ca2+. Antiserum prepared against the 105K hemolysin did not neutralize the activity of the 29.5K hemolysin; conversely, antiserum prepared against the 29.5K hemolysin did not neutralize the activity of the 105K hemolysin. The hemolytic activity was not neutralized with antisera against hemolytic Escherichia coli, Streptococcus agalactiae, or purified streptolysin O, but antisera prepared against recombinants containing the 29.5K gene and convalescent pig sera abrogated hemolytic activity. Although hemolytic activity could be detected in several strains of E. coli K-12 and in minicells expressing several different constructs encoding the 29.5K hemolysin, we could not rigorously exclude the possibility that the gene which we have isolated encodes a regulator of hemolytic activity rather than a hemolysin per se.     

Neural cell adhesion molecule contributes to hemopoiesis-supporting capacity of stromal cell lines

To clarify mechanisms underlying cell-to-cell interactions between hemopoietic stem cells (HSCs) and stromal cells, we established a stromal cell line (FMS/PA6-P) from day-16 fetal bone marrow (BM) adherent cells using an anti-PA6 monoclonal antibody (mAb) specific for BM stromal cells. Importantly, this FMS/PA6-P cell line, showing homogenous fibroblastic morphology, is absent from hematolymphoid and endothelial lineage markers and maintains a high level of expression of PA6 molecule, recognized by the anti-PA6 mAb, for approximately 20 passages. Further, the cell line expressing a high level of PA6 molecule has a better hemopoiesis-supporting capacity in vitro than other stromal cell lines such as PA6 and MS-5. In fact, the PA6 molecule is closely related to the hemopoiesis-supporting capacity of the stromal cells because the proliferation of HSCs was suppressed to a great extent by the anti-PA6 mAb. Affinity chromatography and mass peptide fingerprinting revealed that the protein reacting with the anti-PA6 mAb is neural cell adhesion molecule (NCAM). The frequencies of long-term cobblestone area-forming cells and long-term culture-initiating cells were significantly suppressed by repression of NCAM in the FMS/PA6-P cells using NCAM small interfering RNA. Our findings clearly indicate that NCAM functions on the maintenance of HSCs.