维拉帕米对大鼠肝脏贮脂细胞增殖及胶原基因表达的影响

在肝纤维化的发生发展过程中，细胞外基质的过度合成和异常沉积是最主要的病理过程。研究表明，病理状态下，贮脂细胞（ＦＳＣ）被激活，数量增多，分泌大量的胶原等细胞外基质，导致肝纤维化的发生、发展［１］。材料和方法一、实验动物雄性ＳＤ大鼠１０只，其中５只皮下注射４０％ＣＣｌ４茶油溶液建立肝纤维化模型。二、试剂链霉蛋白酶和Ｎｙｃｏｄｅｎｚ购于Ｓｉｇｍａ公司；胶原酶购于上海医工院；维拉帕米（Ｖｅｒ）购于Ｋｎｏｌｌ公司；ＲＮＡ提取剂、Ｐ３２ｄＣＴＰ、随机引物标记试剂盒购于Ｇｉｂｃｏ、亚辉、Ｐｒｏｍｅｇａ公司三…     

Gefäßendoprothetik: Entwicklung, aktueller Stand und Perspektiven einer neuen Technologie

The treatment of infrarenal aortic aneurysms by means of transluminally placed endovascular prostheses reflects significant progress in the field of vascular surgery. In the case of infrarenal aortic aneurysm it is possible to achieve technically successful implantation of such a prosthesis in well over 90 % of cases. The rate of clinical success, meaning lasting effective exclusion of the aortic aneurysm, cannot (yet) be definitively determined, since no long-term results are so far available. Secondary leaks are observed in at least 10 % of all patients, making a further therapy necessary (endorepair, conversion, embolization). Further development of endovascular prostheses will include optimization of the aortal/iliac attachment of the prostheses, a better configuration and the development of long-lasting materials that can be used for endovascular prostheses.     

Ultrastructural localization of alpha-3 integrin subunit in malignant melanoma and adjacent epidermis

Eight cases of malignant melanoma were studied by immunohistopathology and immunoelectron microscopy. Alpha3 integrin localization was documented in malignant melanoma cells, basal and suprabasal keratinocytes, melanocytes, blood vessels and in basement membrane material. In melanoma cell membranes and, to a lesser extent, the interior of melanosomal vesicles were labeled. In addition, neighbouring cells such as basal and suprabasal keratinocytes and melanocytes showed strong alpha3-integrin expression. The labeling was much stronger in the plasma membrane than in the cytoplasm. Endothelial cells showed stronger labeling of the cytoplasm than of the plasma membrane. In some cases we found increased flocculent material surrounding melanoma cells or nests that seems to contain basement membrane protein components, specifically alpha3-integrin subunits. Compared to normal epidermis alpha3-labeling was stronger in tissues of malignant melanoma.     

A test for publication bias in meta-analysis with sparse binary data

A new test for the detection of publication bias in meta-analysis with sparse binary data is proposed. The test statistic is based on observed and expected cell frequencies, and the variance of the observed cell frequencies. These quantities are utilized in a rank correlation test. Type I error rate and power of the test are evaluated in simulations; results are compared to those of two other commonly used test procedures. Sample sizes were generated according to findings in a survey of eight German medical journals. Simulation results indicate that, in contrast to existing test procedures, the new test holds the prescribed significance level when data are sparse. However, the power of all tests is low in many situations of practical importance.     

Model selection and Bayesian methods in statistical genetics: summary of group 11 contributions to Genetic Analysis Workshop 15

The research presented in group 11 of the Genetic Analysis Workshop 15 (GAW15) falls into two major themes: Model selection approaches for gene mapping (both Bayesian and Frequentist); and other Bayesian methods. These methods either allow relaxation of some of the common assumptions, such as mode of inheritance, for studying complicated genetic systems, or allow incorporation of additional information into the model. Over half of the groups applied model selection methods on all three data sets, using models in which genetic markers were used as predictors for linkage, phenotype expression, or transmission to an affected offspring. Most groups employed variations of Stochastic Search Variable Selection as the model selection method of choice. A brief review of this class of methods is given in this summary paper, followed by highlights of other methods and overall summaries of each contribution to the GAW15 presentation group 11. These group contributions exhibit the value of framing genetic problems in terms of model selection, and highlight the impact of variable selection for gene mapping.     

新生牛跟腱胶原蛋白海绵与细胞的生物相容性

目的:采用新生牛跟腱制备生物医用胶原蛋白海绵,通过分别接种Vero细胞、天祝白牦牛胚胎皮肤原代细胞和岷县黑紫羔羊睾丸原代细胞至胶原蛋白海绵组织支架上,观察新生牛跟腱胶原蛋白海绵与3种细胞的生物相容性。方法:实验于2006-02/05在西北民族大学生命科学与工程学院生物工程与技术国家民委重点实验室完成。①用新生牛跟腱经冰醋酸、胃蛋白酶等消化,经盐析、透析及冻干等处理后,制备成胶原蛋白海绵。②在六孔板中,将Vero细胞、天祝白牦牛胚胎皮肤原代细胞和岷县黑紫羔羊睾丸原代细胞分别接种于经紫外线、臭氧灭菌后的胶原蛋白海绵上,经37℃体积分数为0.05的CO2恒温培养;并用另一组细胞在凯氏瓶中培养作对照实验。用奥林帕斯倒置相差显微镜及JVC摄像系统观察、拍摄与记录细胞生长情况,并于培养11d,用考马斯亮蓝和苏木精-伊红染色,证实相差显微镜观察的结果。结果:①胶原蛋白海绵制备结果:用新生牛跟腱制备得到具有一定孔隙度的胶原蛋白海绵,经紫外线、臭氧灭菌后可进行细胞培养。②3种细胞在胶原蛋白海绵上和六孔板底的生长情况:3种细胞接种后5h,在胶原蛋白海绵周围的六孔板孔底可看到Vero细胞已贴壁、伸展,个别细胞有分裂现象,在胶原蛋白海绵表面,隐约可见圆形细胞排列。Vero细胞和天祝白牦牛胚胎皮肤原代f2细胞接种72h、岷县黑裘皮羔羊睾丸原代f2细胞接种48h时,孔底细胞已经铺满单层,但与对照孔比较,生长速度较慢。②3种细胞用考马斯亮蓝细胞骨架染色和苏木精-伊红染色的结果:培养到第11天,3种来自不同动物、不同组织的细胞接种的胶原蛋白海绵支架孔中均有大量细胞良好生长,胶原海绵外观变得挺拔、透明、有韧性。结论:新生牛跟腱胶原蛋白海绵,对Vero细胞、天祝白牦牛胚胎皮肤原代细胞和岷县黑紫羔羊睾丸原代细胞无毒性,3种细胞均能在其上良好生长,但在体内是否会引起免疫排斥反应,还有待进一步研究。新生牛跟腱有望成为医用胶原蛋白海绵产品新的原材料。